2008-08-06 Marc Gauthier <marc@tensilica.com>

[pf3gnuchains/gcc-fork.git] / gcc / testsuite / lib / target-supports.exp

#   Copyright (C) 1999, 2001, 2003, 2004, 2005, 2006, 2007
#    Free Software Foundation, Inc.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GCC; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.

# Please email any bugs, comments, and/or additions to this file to:
# gcc-patches@gcc.gnu.org

# This file defines procs for determining features supported by the target.

# Try to compile the code given by CONTENTS into an output file of
# type TYPE, where TYPE is as for target_compile.  Return a list
# whose first element contains the compiler messages and whose
# second element is the name of the output file.
#
# BASENAME is a prefix to use for source and output files.
# If ARGS is not empty, its first element is a string that
# should be added to the command line.
#
# Assume by default that CONTENTS is C code.  C++ code should contain
# "// C++" and Fortran code should contain "! Fortran".
proc check_compile {basename type contents args} {
    global tool

    if { [llength $args] > 0 } {
        set options [list "additional_flags=[lindex $args 0]"]
    } else {
        set options ""
    }
    switch -glob -- $contents {
        "*! Fortran*" { set src ${basename}[pid].f90 }
        "*// C++*" { set src ${basename}[pid].cc }
        default { set src ${basename}[pid].c }
    }
    set compile_type $type
    switch -glob $type {
        assembly { set output ${basename}[pid].s }
        object { set output ${basename}[pid].o }
        executable { set output ${basename}[pid].exe }
        "rtl-*" {
            set output ${basename}[pid].s
            lappend options "additional_flags=-fdump-$type"
            set compile_type assembly
        }
    }
    set f [open $src "w"]
    puts $f $contents
    close $f
    set lines [${tool}_target_compile $src $output $compile_type "$options"]
    file delete $src

    set scan_output $output
    # Don't try folding this into the switch above; calling "glob" before the
    # file is created won't work.
    if [regexp "rtl-(.*)" $type dummy rtl_type] {
        set scan_output "[glob $src.\[0-9\]\[0-9\]\[0-9\]r.$rtl_type]"
        file delete $output
    }

    return [list $lines $scan_output]
}

proc current_target_name { } {
    global target_info
    if [info exists target_info(target,name)] {
        set answer $target_info(target,name)
    } else {
        set answer ""
    }
    return $answer
}

# Implement an effective-target check for property PROP by invoking
# the Tcl command ARGS and seeing if it returns true.

proc check_cached_effective_target { prop args } {
    global et_cache

    set target [current_target_name]
    if {![info exists et_cache($prop,target)]
        || $et_cache($prop,target) != $target} {
        verbose "check_cached_effective_target $prop: checking $target" 2
        set et_cache($prop,target) $target
        set et_cache($prop,value) [uplevel eval $args]
    }
    set value $et_cache($prop,value)
    verbose "check_cached_effective_target $prop: returning $value for $target" 2
    return $value
}

# Like check_compile, but delete the output file and return true if the
# compiler printed no messages.
proc check_no_compiler_messages_nocache {args} {
    set result [eval check_compile $args]
    set lines [lindex $result 0]
    set output [lindex $result 1]
    remote_file build delete $output
    return [string match "" $lines]
}

# Like check_no_compiler_messages_nocache, but cache the result.
# PROP is the property we're checking, and doubles as a prefix for
# temporary filenames.
proc check_no_compiler_messages {prop args} {
    return [check_cached_effective_target $prop {
        eval [list check_no_compiler_messages_nocache $prop] $args
    }]
}

# Like check_compile, but return true if the compiler printed no
# messages and if the contents of the output file satisfy PATTERN.
# If PATTERN has the form "!REGEXP", the contents satisfy it if they
# don't match regular expression REGEXP, otherwise they satisfy it
# if they do match regular expression PATTERN.  (PATTERN can start
# with something like "[!]" if the regular expression needs to match
# "!" as the first character.)
#
# Delete the output file before returning.  The other arguments are
# as for check_compile.
proc check_no_messages_and_pattern_nocache {basename pattern args} {
    global tool

    set result [eval [list check_compile $basename] $args]
    set lines [lindex $result 0]
    set output [lindex $result 1]

    set ok 0
    if { [string match "" $lines] } {
        set chan [open "$output"]
        set invert [regexp {^!(.*)} $pattern dummy pattern]
        set ok [expr { [regexp $pattern [read $chan]] != $invert }]
        close $chan
    }

    remote_file build delete $output
    return $ok
}

# Like check_no_messages_and_pattern_nocache, but cache the result.
# PROP is the property we're checking, and doubles as a prefix for
# temporary filenames.
proc check_no_messages_and_pattern {prop pattern args} {
    return [check_cached_effective_target $prop {
        eval [list check_no_messages_and_pattern_nocache $prop $pattern] $args
    }]
}

# Try to compile and run an executable from code CONTENTS.  Return true
# if the compiler reports no messages and if execution "passes" in the
# usual DejaGNU sense.  The arguments are as for check_compile, with
# TYPE implicitly being "executable".
proc check_runtime_nocache {basename contents args} {
    global tool

    set result [eval [list check_compile $basename executable $contents] $args]
    set lines [lindex $result 0]
    set output [lindex $result 1]

    set ok 0
    if { [string match "" $lines] } {
        # No error messages, everything is OK.
        set result [remote_load target "./$output" "" ""]
        set status [lindex $result 0]
        verbose "check_runtime_nocache $basename: status is <$status>" 2
        if { $status == "pass" } {
            set ok 1
        }
    }
    remote_file build delete $output
    return $ok
}

# Like check_runtime_nocache, but cache the result.  PROP is the
# property we're checking, and doubles as a prefix for temporary
# filenames.
proc check_runtime {prop args} {
    global tool

    return [check_cached_effective_target $prop {
        eval [list check_runtime_nocache $prop] $args
    }]
}

###############################
# proc check_weak_available { }
###############################

# weak symbols are only supported in some configs/object formats
# this proc returns 1 if they're supported, 0 if they're not, or -1 if unsure

proc check_weak_available { } {
    global target_triplet
    global target_cpu

    # All mips targets should support it

    if { [ string first "mips" $target_cpu ] >= 0 } {
        return 1
    }

    # All solaris2 targets should support it

    if { [regexp ".*-solaris2.*" $target_triplet] } {
        return 1
    }

    # DEC OSF/1/Digital UNIX/Tru64 UNIX supports it

    if { [regexp "alpha.*osf.*" $target_triplet] } {
        return 1
    }

    # Windows targets Cygwin and MingW32 support it

    if { [regexp ".*mingw32|.*cygwin" $target_triplet] } {
        return 1
    }

    # HP-UX 10.X doesn't support it

    if { [istarget "hppa*-*-hpux10*"] } {
        return 0
    }

    # ELF and ECOFF support it. a.out does with gas/gld but may also with
    # other linkers, so we should try it

    set objformat [gcc_target_object_format]

    switch $objformat {
        elf      { return 1 }
        ecoff    { return 1 }
        a.out    { return 1 }
        mach-o   { return 1 }
        som      { return 1 }
        unknown  { return -1 }
        default  { return 0 }
    }
}

###############################
# proc check_visibility_available { what_kind }
###############################

# The visibility attribute is only support in some object formats
# This proc returns 1 if it is supported, 0 if not.
# The argument is the kind of visibility, default/protected/hidden/internal.

proc check_visibility_available { what_kind } {
    global tool
    global target_triplet

    # On NetWare, support makes no sense.
    if { [istarget *-*-netware*] } {
        return 0
    }

    if [string match "" $what_kind] { set what_kind "hidden" }

    return [check_no_compiler_messages visibility_available_$what_kind object "
        void f() __attribute__((visibility(\"$what_kind\")));
        void f() {}
    "]
}

###############################
# proc check_alias_available { }
###############################

# Determine if the target toolchain supports the alias attribute.

# Returns 2 if the target supports aliases.  Returns 1 if the target
# only supports weak aliased.  Returns 0 if the target does not
# support aliases at all.  Returns -1 if support for aliases could not
# be determined.

proc check_alias_available { } {
    global alias_available_saved
    global tool

    if [info exists alias_available_saved] {
        verbose "check_alias_available  returning saved $alias_available_saved" 2
    } else {
        set src alias[pid].c
        set obj alias[pid].o
        verbose "check_alias_available  compiling testfile $src" 2
        set f [open $src "w"]
        # Compile a small test program.  The definition of "g" is
        # necessary to keep the Solaris assembler from complaining
        # about the program.
        puts $f "#ifdef __cplusplus\nextern \"C\"\n#endif\n"
        puts $f "void g() {} void f() __attribute__((alias(\"g\")));"
        close $f
        set lines [${tool}_target_compile $src $obj object ""]
        file delete $src
        remote_file build delete $obj

        if [string match "" $lines] then {
            # No error messages, everything is OK.
            set alias_available_saved 2
        } else {
            if [regexp "alias definitions not supported" $lines] {
                verbose "check_alias_available  target does not support aliases" 2

                set objformat [gcc_target_object_format]

                if { $objformat == "elf" } {
                    verbose "check_alias_available  but target uses ELF format, so it ought to" 2
                    set alias_available_saved -1
                } else {
                    set alias_available_saved 0
                }
            } else {
                if [regexp "only weak aliases are supported" $lines] {
                verbose "check_alias_available  target supports only weak aliases" 2
                set alias_available_saved 1
                } else {
                    set alias_available_saved -1
                }
            }
        }

        verbose "check_alias_available  returning $alias_available_saved" 2
    }

    return $alias_available_saved
}

# Returns true if --gc-sections is supported on the target.

proc check_gc_sections_available { } {
    global gc_sections_available_saved
    global tool

    if {![info exists gc_sections_available_saved]} {
        # Some targets don't support gc-sections despite whatever's
        # advertised by ld's options.
        if { [istarget alpha*-*-*]
             || [istarget ia64-*-*] } {
            set gc_sections_available_saved 0
            return 0
        }

        # elf2flt uses -q (--emit-relocs), which is incompatible with
        # --gc-sections.
        if { [board_info target exists ldflags]
             && [regexp " -elf2flt\[ =\]" " [board_info target ldflags] "] } {
            set gc_sections_available_saved 0
            return 0
        }

        # VxWorks kernel modules are relocatable objects linked with -r,
        # while RTP executables are linked with -q (--emit-relocs).
        # Both of these options are incompatible with --gc-sections.
        if { [istarget *-*-vxworks*] } {
            set gc_sections_available_saved 0
            return 0
        }

        # Check if the ld used by gcc supports --gc-sections.
        set gcc_spec [${tool}_target_compile "-dumpspecs" "" "none" ""]
        regsub ".*\n\*linker:\[ \t\]*\n(\[^ \t\n\]*).*" "$gcc_spec" {\1} linker
        set gcc_ld [lindex [${tool}_target_compile "-print-prog-name=$linker" "" "none" ""] 0]
        set ld_output [remote_exec host "$gcc_ld" "--help"]
        if { [ string first "--gc-sections" $ld_output ] >= 0 } {
            set gc_sections_available_saved 1
        } else {
            set gc_sections_available_saved 0
        }
    }
    return $gc_sections_available_saved
}

# Return 1 if according to target_info struct and explicit target list
# target is supposed to support trampolines.
 
proc check_effective_target_trampolines { } {
    if [target_info exists no_trampolines] {
      return 0
    }
    if { [istarget avr-*-*]
         || [istarget hppa2.0w-hp-hpux11.23]
        || [istarget hppa64-hp-hpux11.23] } {
        return 0;   
    }
    return 1
}

# Return 1 if according to target_info struct and explicit target list
# target is supposed to keep null pointer checks. This could be due to 
# use of option fno-delete-null-pointer-checks or hardwired in target.
 
proc check_effective_target_keeps_null_pointer_checks { } {
    if [target_info exists keeps_null_pointer_checks] {
      return 1
    }
    if { [istarget avr-*-*] } {
        return 1;   
    }
    return 0
}

# Return true if profiling is supported on the target.

proc check_profiling_available { test_what } {
    global profiling_available_saved

    verbose "Profiling argument is <$test_what>" 1

    # These conditions depend on the argument so examine them before
    # looking at the cache variable.

    # Support for -p on solaris2 relies on mcrt1.o which comes with the
    # vendor compiler.  We cannot reliably predict the directory where the
    # vendor compiler (and thus mcrt1.o) is installed so we can't
    # necessarily find mcrt1.o even if we have it.
    if { [istarget *-*-solaris2*] && [lindex $test_what 1] == "-p" } {
        return 0
    }

    # Support for -p on irix relies on libprof1.a which doesn't appear to
    # exist on any irix6 system currently posting testsuite results.
    # Support for -pg on irix relies on gcrt1.o which doesn't exist yet.
    # See: http://gcc.gnu.org/ml/gcc/2002-10/msg00169.html
    if { [istarget mips*-*-irix*]
    && ([lindex $test_what 1] == "-p" || [lindex $test_what 1] == "-pg") } {
        return 0
    }

    # MinGW does not support -p.
    if { [istarget *-*-mingw*] && [lindex $test_what 1] == "-p" } {
        return 0
    }

    # At present, there is no profiling support on NetWare.
    if { [istarget *-*-netware*] } {
        return 0
    }

    # uClibc does not have gcrt1.o.
    if { [check_effective_target_uclibc]
         && ([lindex $test_what 1] == "-p"
             || [lindex $test_what 1] == "-pg") } {
        return 0
    }

    # Now examine the cache variable.
    if {![info exists profiling_available_saved]} {
        # Some targets don't have any implementation of __bb_init_func or are
        # missing other needed machinery.
        if { [istarget mmix-*-*]
             || [istarget arm*-*-eabi*]
             || [istarget arm*-*-elf]
             || [istarget arm*-*-symbianelf*]
             || [istarget avr-*-*]
             || [istarget bfin-*-*]
             || [istarget powerpc-*-eabi*]
             || [istarget cris-*-*]
             || [istarget crisv32-*-*]
             || [istarget fido-*-elf]
             || [istarget h8300-*-*]
             || [istarget m32c-*-elf]
             || [istarget m68k-*-elf]
             || [istarget m68k-*-uclinux*]
             || [istarget mips*-*-elf*]
             || [istarget xstormy16-*]
             || [istarget xtensa*-*-elf]
             || [istarget *-*-vxworks*] } {
            set profiling_available_saved 0
        } else {
            set profiling_available_saved 1
        }
    }

    return $profiling_available_saved
}

# Return 1 if target has packed layout of structure members by
# default, 0 otherwise.  Note that this is slightly different than
# whether the target has "natural alignment": both attributes may be
# false.

proc check_effective_target_default_packed { } {
    return [check_no_compiler_messages default_packed assembly {
        struct x { char a; long b; } c;
        int s[sizeof (c) == sizeof (char) + sizeof (long) ? 1 : -1];
    }]
}

# Return 1 if target has PCC_BITFIELD_TYPE_MATTERS defined.  See
# documentation, where the test also comes from.

proc check_effective_target_pcc_bitfield_type_matters { } {
    # PCC_BITFIELD_TYPE_MATTERS isn't just about unnamed or empty
    # bitfields, but let's stick to the example code from the docs.
    return [check_no_compiler_messages pcc_bitfield_type_matters assembly {
        struct foo1 { char x; char :0; char y; };
        struct foo2 { char x; int :0; char y; };
        int s[sizeof (struct foo1) != sizeof (struct foo2) ? 1 : -1];
    }]
}

# Return 1 if thread local storage (TLS) is supported, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_tls {} {
    return [check_no_compiler_messages tls assembly {
        __thread int i;
        int f (void) { return i; }
        void g (int j) { i = j; }
    }]
}

# Return 1 if *native* thread local storage (TLS) is supported, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_tls_native {} {
    # VxWorks uses emulated TLS machinery, but with non-standard helper
    # functions, so we fail to automatically detect it.
    global target_triplet
    if { [regexp ".*-.*-vxworks.*" $target_triplet] } {
        return 0
    }
    
    return [check_no_messages_and_pattern tls_native "!emutls" assembly {
        __thread int i;
        int f (void) { return i; }
        void g (int j) { i = j; }
    }]
}

# Return 1 if TLS executables can run correctly, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_tls_runtime {} {
    return [check_runtime tls_runtime {
        __thread int thr = 0;
        int main (void) { return thr; }
    }]
}

# Return 1 if compilation with -fopenmp is error-free for trivial
# code, 0 otherwise.

proc check_effective_target_fopenmp {} {
    return [check_no_compiler_messages fopenmp object {
        void foo (void) { }
    } "-fopenmp"]
}

# Return 1 if compilation with -pthread is error-free for trivial
# code, 0 otherwise.

proc check_effective_target_pthread {} {
    return [check_no_compiler_messages pthread object {
        void foo (void) { }
    } "-pthread"]
}

# Return 1 if the target supports -fstack-protector
proc check_effective_target_fstack_protector {} {
    return [check_runtime fstack_protector {
        int main (void) { return 0; }
    } "-fstack-protector"]
}

# Return 1 if compilation with -freorder-blocks-and-partition is error-free
# for trivial code, 0 otherwise.

proc check_effective_target_freorder {} {
    return [check_no_compiler_messages freorder object {
        void foo (void) { }
    } "-freorder-blocks-and-partition"]
}

# Return 1 if -fpic and -fPIC are supported, as in no warnings or errors
# emitted, 0 otherwise.  Whether a shared library can actually be built is
# out of scope for this test.

proc check_effective_target_fpic { } {
    # Note that M68K has a multilib that supports -fpic but not
    # -fPIC, so we need to check both.  We test with a program that
    # requires GOT references.
    foreach arg {fpic fPIC} {
        if [check_no_compiler_messages $arg object {
            extern int foo (void); extern int bar;
            int baz (void) { return foo () + bar; }
        } "-$arg"] {
            return 1
        }
    }
    return 0
}

# Return true if the target supports -mpaired-single (as used on MIPS).

proc check_effective_target_mpaired_single { } {
    return [check_no_compiler_messages mpaired_single object {
        void foo (void) { }
    } "-mpaired-single"]
}

# Return true if the target has access to FPU instructions.

proc check_effective_target_hard_float { } {
    if { [istarget mips*-*-*] } {
        return [check_no_compiler_messages hard_float assembly {
                #if (defined __mips_soft_float || defined __mips16)
                #error FOO
                #endif
        }]
    }

    # The generic test equates hard_float with "no call for adding doubles".
    return [check_no_messages_and_pattern hard_float "!\\(call" rtl-expand {
        double a (double b, double c) { return b + c; }
    }]
}

# Return true if the target is a 64-bit MIPS target.

proc check_effective_target_mips64 { } {
    return [check_no_compiler_messages mips64 assembly {
        #ifndef __mips64
        #error FOO
        #endif
    }]
}

# Return true if the target is a MIPS target that does not produce
# MIPS16 code.

proc check_effective_target_nomips16 { } {
    return [check_no_compiler_messages nomips16 object {
        #ifndef __mips
        #error FOO
        #else
        /* A cheap way of testing for -mflip-mips16.  */
        void foo (void) { asm ("addiu $20,$20,1"); }
        void bar (void) { asm ("addiu $20,$20,1"); }
        #endif
    }]
}

# Add the options needed for MIPS16 function attributes.  At the moment,
# we don't support MIPS16 PIC.

proc add_options_for_mips16_attribute { flags } {
    return "$flags -mno-abicalls -fno-pic -DMIPS16=__attribute__((mips16))"
}

# Return true if we can force a mode that allows MIPS16 code generation.
# We don't support MIPS16 PIC, and only support MIPS16 -mhard-float
# for o32 and o64.

proc check_effective_target_mips16_attribute { } {
    return [check_no_compiler_messages mips16_attribute assembly {
        #ifdef PIC
        #error FOO
        #endif
        #if defined __mips_hard_float \
            && (!defined _ABIO32 || _MIPS_SIM != _ABIO32) \
            && (!defined _ABIO64 || _MIPS_SIM != _ABIO64)
        #error FOO
        #endif
    } [add_options_for_mips16_attribute ""]]
}

# Return 1 if the current multilib does not generate PIC by default.

proc check_effective_target_nonpic { } {
    return [check_no_compiler_messages nonpic assembly {
        #if __PIC__
        #error FOO
        #endif
    }]
}

# Return 1 if the target does not use a status wrapper.

proc check_effective_target_unwrapped { } {
    if { [target_info needs_status_wrapper] != "" \
             && [target_info needs_status_wrapper] != "0" } {
        return 0
    }
    return 1
}

# Return true if iconv is supported on the target. In particular IBM1047.

proc check_iconv_available { test_what } {
    global libiconv

    # If the tool configuration file has not set libiconv, try "-liconv"
    if { ![info exists libiconv] } {
        set libiconv "-liconv"
    }
    set test_what [lindex $test_what 1]
    return [check_runtime_nocache $test_what [subst {
        #include <iconv.h>
        int main (void)
        {
          iconv_t cd;

          cd = iconv_open ("$test_what", "UTF-8");
          if (cd == (iconv_t) -1)
            return 1;
          return 0;
        }
    }] $libiconv]
}

# Return true if named sections are supported on this target.

proc check_named_sections_available { } {
    return [check_no_compiler_messages named_sections assembly {
        int __attribute__ ((section("whatever"))) foo;
    }]
}

# Return 1 if the target supports Fortran real kinds larger than real(8),
# 0 otherwise.
#
# When the target name changes, replace the cached result.

proc check_effective_target_fortran_large_real { } {
    return [check_no_compiler_messages fortran_large_real executable {
        ! Fortran
        integer,parameter :: k = selected_real_kind (precision (0.0_8) + 1)
        real(kind=k) :: x
        x = cos (x)
        end
    }]
}

# Return 1 if the target supports Fortran integer kinds larger than
# integer(8), 0 otherwise.
#
# When the target name changes, replace the cached result.

proc check_effective_target_fortran_large_int { } {
    return [check_no_compiler_messages fortran_large_int executable {
        ! Fortran
        integer,parameter :: k = selected_int_kind (range (0_8) + 1)
        integer(kind=k) :: i
        end
    }]
}

# Return 1 if the target supports Fortran integer(16), 0 otherwise.
#
# When the target name changes, replace the cached result.

proc check_effective_target_fortran_integer_16 { } {
    return [check_no_compiler_messages fortran_integer_16 executable {
        ! Fortran
        integer(16) :: i
        end
    }]
}

# Return 1 if we can statically link libgfortran, 0 otherwise.
#
# When the target name changes, replace the cached result.

proc check_effective_target_static_libgfortran { } {
    return [check_no_compiler_messages static_libgfortran executable {
        ! Fortran
        print *, 'test'
        end
    } "-static"]
}

# Return 1 if the target supports executing 750CL paired-single instructions, 0
# otherwise.  Cache the result.

proc check_750cl_hw_available { } {
    return [check_cached_effective_target 750cl_hw_available {
        # If this is not the right target then we can skip the test.
        if { ![istarget powerpc-*paired*] } {
            expr 0
        } else {
            check_runtime_nocache 750cl_hw_available {
                 int main()
                 {
                 #ifdef __MACH__
                   asm volatile ("ps_mul v0,v0,v0");
                 #else
                   asm volatile ("ps_mul 0,0,0");
                 #endif
                   return 0;
                 }
            } "-mpaired"
        }
    }]
}

# Return 1 if the target supports executing SSE2 instructions, 0
# otherwise.  Cache the result.

proc check_sse2_hw_available { } {
    return [check_cached_effective_target sse2_hw_available {
        # If this is not the right target then we can skip the test.
        if { !([istarget x86_64-*-*] || [istarget i?86-*-*]) } {
            expr 0
        } else {
            check_runtime_nocache sse2_hw_available {
                #include "cpuid.h"
                int main ()
                {
                  unsigned int eax, ebx, ecx, edx = 0;
                  if (__get_cpuid (1, &eax, &ebx, &ecx, &edx))
                    return !(edx & bit_SSE2);
                  return 1;
                }
            } ""
        }
    }]
}

# Return 1 if the target supports executing AltiVec instructions, 0
# otherwise.  Cache the result.

proc check_vmx_hw_available { } {
    return [check_cached_effective_target vmx_hw_available {
        # Some simulators are known to not support VMX instructions.
        if { [istarget powerpc-*-eabi] || [istarget powerpc*-*-eabispe] } {
            expr 0
        } else {
            # Most targets don't require special flags for this test case, but
            # Darwin does.
            if { [istarget *-*-darwin*]
                 || [istarget *-*-aix*] } {
                set options "-maltivec"
            } else {
                set options ""
            }
            check_runtime_nocache vmx_hw_available {
                int main()
                {
                #ifdef __MACH__
                  asm volatile ("vor v0,v0,v0");
                #else
                  asm volatile ("vor 0,0,0");
                #endif
                  return 0;
                }
            } $options
        }
    }]
}

# GCC 3.4.0 for powerpc64-*-linux* included an ABI fix for passing
# complex float arguments.  This affects gfortran tests that call cabsf
# in libm built by an earlier compiler.  Return 1 if libm uses the same
# argument passing as the compiler under test, 0 otherwise.
#
# When the target name changes, replace the cached result.

proc check_effective_target_broken_cplxf_arg { } {
    return [check_cached_effective_target broken_cplxf_arg {
        # Skip the work for targets known not to be affected.
        if { ![istarget powerpc64-*-linux*] } {
            expr 0
        } elseif { ![is-effective-target lp64] } {
            expr 0
        } else {
            check_runtime_nocache broken_cplxf_arg {
                #include <complex.h>
                extern void abort (void);
                float fabsf (float);
                float cabsf (_Complex float);
                int main ()
                {
                  _Complex float cf;
                  float f;
                  cf = 3 + 4.0fi;
                  f = cabsf (cf);
                  if (fabsf (f - 5.0) > 0.0001)
                    abort ();
                  return 0;
                }
            } "-lm"
        }
    }]
}

proc check_alpha_max_hw_available { } {
    return [check_runtime alpha_max_hw_available {
        int main() { return __builtin_alpha_amask(1<<8) != 0; }
    }]
}

# Returns true iff the FUNCTION is available on the target system.
# (This is essentially a Tcl implementation of Autoconf's
# AC_CHECK_FUNC.)

proc check_function_available { function } {
    return [check_no_compiler_messages ${function}_available \
                executable [subst {
        #ifdef __cplusplus
        extern "C"
        #endif
        char $function ();
        int main () { $function (); }
    }]]
}

# Returns true iff "fork" is available on the target system.

proc check_fork_available {} {
    return [check_function_available "fork"]
}

# Returns true iff "mkfifo" is available on the target system.

proc check_mkfifo_available {} {
    if {[istarget *-*-cygwin*]} {
       # Cygwin has mkfifo, but support is incomplete.
       return 0
     }

    return [check_function_available "mkfifo"]
}

# Returns true iff "__cxa_atexit" is used on the target system.

proc check_cxa_atexit_available { } {
    return [check_cached_effective_target cxa_atexit_available {
        if { [istarget "hppa*-*-hpux10*"] } {
            # HP-UX 10 doesn't have __cxa_atexit but subsequent test passes.
            expr 0
        } else {
            check_runtime_nocache cxa_atexit_available {
                // C++
                #include <stdlib.h>
                static unsigned int count;
                struct X
                {
                  X() { count = 1; }
                  ~X()
                  {
                    if (count != 3)
                      exit(1);
                    count = 4;
                  }
                };
                void f()
                {
                  static X x;
                }
                struct Y
                {
                  Y() { f(); count = 2; }
                  ~Y()
                  {
                    if (count != 2)
                      exit(1);
                    count = 3;
                  }
                };
                Y y;
                int main() { return 0; }
            }
        }
    }]
}


# Return 1 if we're generating 32-bit code using default options, 0
# otherwise.

proc check_effective_target_ilp32 { } {
    return [check_no_compiler_messages ilp32 object {
        int dummy[sizeof (int) == 4
                  && sizeof (void *) == 4
                  && sizeof (long) == 4 ? 1 : -1];
    }]
}

# Return 1 if we're generating 32-bit or larger integers using default
# options, 0 otherwise.

proc check_effective_target_int32plus { } {
    return [check_no_compiler_messages int32plus object {
        int dummy[sizeof (int) >= 4 ? 1 : -1];
    }]
}

# Return 1 if we're generating 32-bit or larger pointers using default
# options, 0 otherwise.

proc check_effective_target_ptr32plus { } {
    return [check_no_compiler_messages ptr32plus object {
        int dummy[sizeof (void *) >= 4 ? 1 : -1];
    }]
}

# Return 1 if we support 32-bit or larger array and structure sizes
# using default options, 0 otherwise.

proc check_effective_target_size32plus { } {
    return [check_no_compiler_messages size32plus object {
        char dummy[65537];
    }]
}

# Returns 1 if we're generating 16-bit or smaller integers with the
# default options, 0 otherwise.

proc check_effective_target_int16 { } {
    return [check_no_compiler_messages int16 object {
        int dummy[sizeof (int) < 4 ? 1 : -1];
    }]
}

# Return 1 if we're generating 64-bit code using default options, 0
# otherwise.

proc check_effective_target_lp64 { } {
    return [check_no_compiler_messages lp64 object {
        int dummy[sizeof (int) == 4
                  && sizeof (void *) == 8
                  && sizeof (long) == 8 ? 1 : -1];
    }]
}

# Return 1 if the target supports long double larger than double,
# 0 otherwise.

proc check_effective_target_large_long_double { } {
    return [check_no_compiler_messages large_long_double object {
        int dummy[sizeof(long double) > sizeof(double) ? 1 : -1];
    }]
}

# Return 1 if the target supports compiling fixed-point,
# 0 otherwise.

proc check_effective_target_fixed_point { } {
    return [check_no_compiler_messages fixed_point object {
        _Sat _Fract x; _Sat _Accum y;
    }]
}

# Return 1 if the target supports compiling decimal floating point,
# 0 otherwise.

proc check_effective_target_dfp_nocache { } {
    verbose "check_effective_target_dfp_nocache: compiling source" 2
    set ret [check_no_compiler_messages_nocache dfp object {
        _Decimal32 x; _Decimal64 y; _Decimal128 z;
    }]
    verbose "check_effective_target_dfp_nocache: returning $ret" 2
    return $ret
}

proc check_effective_target_dfprt_nocache { } {
    return [check_runtime_nocache dfprt {
        _Decimal32 x = 1.2df; _Decimal64 y = 2.3dd; _Decimal128 z;
        int main () { z = x + y; return 0; }
    }]
}

# Return 1 if the target supports compiling Decimal Floating Point,
# 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_dfp { } {
    return [check_cached_effective_target dfp {
        check_effective_target_dfp_nocache
    }]
}

# Return 1 if the target supports linking and executing Decimal Floating
# Point, # 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_dfprt { } {
    return [check_cached_effective_target dfprt {
        check_effective_target_dfprt_nocache
    }]
}

# Return 1 if the target needs a command line argument to enable a SIMD
# instruction set.

proc check_effective_target_vect_cmdline_needed { } {
    global et_vect_cmdline_needed_saved
    global et_vect_cmdline_needed_target_name

    if { ![info exists et_vect_cmdline_needed_target_name] } {
        set et_vect_cmdline_needed_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_vect_cmdline_needed_target_name } {
        verbose "check_effective_target_vect_cmdline_needed: `$et_vect_cmdline_needed_target_name' `$current_target'" 2
        set et_vect_cmdline_needed_target_name $current_target
        if { [info exists et_vect_cmdline_needed_saved] } {
            verbose "check_effective_target_vect_cmdline_needed: removing cached result" 2
            unset et_vect_cmdline_needed_saved
        }
    }

    if [info exists et_vect_cmdline_needed_saved] {
        verbose "check_effective_target_vect_cmdline_needed: using cached result" 2
    } else {
        set et_vect_cmdline_needed_saved 1
        if { [istarget ia64-*-*]
             || (([istarget x86_64-*-*] || [istarget i?86-*-*])
                 && [check_effective_target_lp64])
             || ([istarget powerpc*-*-*]
                 && ([check_effective_target_powerpc_spe]
                     || [check_effective_target_powerpc_altivec]))
             || [istarget spu-*-*]
             || ([istarget arm*-*-*] && [check_effective_target_arm_neon]) } {
           set et_vect_cmdline_needed_saved 0
        }
    }

    verbose "check_effective_target_vect_cmdline_needed: returning $et_vect_cmdline_needed_saved" 2
    return $et_vect_cmdline_needed_saved
}

# Return 1 if the target supports hardware vectors of int, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_int { } {
    global et_vect_int_saved

    if [info exists et_vect_int_saved] {
        verbose "check_effective_target_vect_int: using cached result" 2
    } else {
        set et_vect_int_saved 0
        if { [istarget i?86-*-*]
             || ([istarget powerpc*-*-*]
                  && ![istarget powerpc-*-linux*paired*])
              || [istarget spu-*-*]
              || [istarget x86_64-*-*]
              || [istarget sparc*-*-*]
              || [istarget alpha*-*-*]
              || [istarget ia64-*-*] 
              || [check_effective_target_arm32] } {
           set et_vect_int_saved 1
        }
    }

    verbose "check_effective_target_vect_int: returning $et_vect_int_saved" 2
    return $et_vect_int_saved
}

# Return 1 if the target supports int->float conversion 
#

proc check_effective_target_vect_intfloat_cvt { } {
    global et_vect_intfloat_cvt_saved

    if [info exists et_vect_intfloat_cvt_saved] {
        verbose "check_effective_target_vect_intfloat_cvt: using cached result" 2
    } else {
        set et_vect_intfloat_cvt_saved 0
        if { [istarget i?86-*-*]
              || ([istarget powerpc*-*-*]
                   && ![istarget powerpc-*-linux*paired*])
              || [istarget x86_64-*-*] } {
           set et_vect_intfloat_cvt_saved 1
        }
    }

    verbose "check_effective_target_vect_intfloat_cvt: returning $et_vect_intfloat_cvt_saved" 2
    return $et_vect_intfloat_cvt_saved
}


# Return 1 if the target supports float->int conversion
#

proc check_effective_target_vect_floatint_cvt { } {
    global et_vect_floatint_cvt_saved

    if [info exists et_vect_floatint_cvt_saved] {
        verbose "check_effective_target_vect_floatint_cvt: using cached result" 2
    } else {
        set et_vect_floatint_cvt_saved 0
        if { [istarget i?86-*-*]
              || [istarget x86_64-*-*] } {
           set et_vect_floatint_cvt_saved 1
        }
    }

    verbose "check_effective_target_vect_floatint_cvt: returning $et_vect_floatint_cvt_saved" 2
    return $et_vect_floatint_cvt_saved
}

# Return 1 is this is an arm target using 32-bit instructions
proc check_effective_target_arm32 { } {
    return [check_no_compiler_messages arm32 assembly {
        #if !defined(__arm__) || (defined(__thumb__) && !defined(__thumb2__))
        #error FOO
        #endif
    }]
}

# Return 1 if this is an ARM target supporting -mfpu=vfp
# -mfloat-abi=softfp.  Some multilibs may be incompatible with these
# options.

proc check_effective_target_arm_vfp_ok { } {
    if { [check_effective_target_arm32] } {
        return [check_no_compiler_messages arm_vfp_ok object {
            int dummy;
        } "-mfpu=vfp -mfloat-abi=softfp"]
    } else {
        return 0
    }
}

# Return 1 if this is an ARM target supporting -mfpu=neon
# -mfloat-abi=softfp.  Some multilibs may be incompatible with these
# options.

proc check_effective_target_arm_neon_ok { } {
    if { [check_effective_target_arm32] } {
        return [check_no_compiler_messages arm_neon_ok object {
            int dummy;
        } "-mfpu=neon -mfloat-abi=softfp"]
    } else {
        return 0
    }
}

# Return 1 is this is an ARM target where -mthumb causes Thumb-1 to be
# used.

proc check_effective_target_arm_thumb1_ok { } {
    return [check_no_compiler_messages arm_thumb1_ok assembly {
        #if !defined(__arm__) || !defined(__thumb__) || defined(__thumb2__)
        #error FOO
        #endif
    } "-mthumb"]
}

# Return 1 if the target supports executing NEON instructions, 0
# otherwise.  Cache the result.

proc check_effective_target_arm_neon_hw { } {
    return [check_runtime arm_neon_hw_available {
        int
        main (void)
        {
          long long a = 0, b = 1;
          asm ("vorr %P0, %P1, %P2"
               : "=w" (a)
               : "0" (a), "w" (b));
          return (a != 1);
        }
    } "-mfpu=neon -mfloat-abi=softfp"]
}

# Return 1 if this is a ARM target with NEON enabled.

proc check_effective_target_arm_neon { } {
    if { [check_effective_target_arm32] } {
        return [check_no_compiler_messages arm_neon object {
            #ifndef __ARM_NEON__
            #error not NEON
            #else
            int dummy;
            #endif
        }]
    } else {
        return 0
    }
}

# Return 1 if this a Loongson-2E or -2F target using an ABI that supports
# the Loongson vector modes.

proc check_effective_target_mips_loongson { } {
    return [check_no_compiler_messages loongson assembly {
        #if !defined(__mips_loongson_vector_rev)
        #error FOO
        #endif
    }]
}

# Return 1 if this is a PowerPC target with floating-point registers.

proc check_effective_target_powerpc_fprs { } {
    if { [istarget powerpc*-*-*]
         || [istarget rs6000-*-*] } {
        return [check_no_compiler_messages powerpc_fprs object {
            #ifdef __NO_FPRS__
            #error no FPRs
            #else
            int dummy;
            #endif
        }]
    } else {
        return 0
    }
}

# Return 1 if this is a PowerPC target with hardware double-precision
# floating point.

proc check_effective_target_powerpc_hard_double { } {
    if { [istarget powerpc*-*-*]
         || [istarget rs6000-*-*] } {
        return [check_no_compiler_messages powerpc_hard_double object {
            #ifdef _SOFT_DOUBLE
            #error soft double
            #else
            int dummy;
            #endif
        }]
    } else {
        return 0
    }
}

# Return 1 if this is a PowerPC target supporting -maltivec.

proc check_effective_target_powerpc_altivec_ok { } {
    if { ([istarget powerpc*-*-*]
         && ![istarget powerpc-*-linux*paired*])
         || [istarget rs6000-*-*] } {
        # AltiVec is not supported on AIX before 5.3.
        if { [istarget powerpc*-*-aix4*]
             || [istarget powerpc*-*-aix5.1*] 
             || [istarget powerpc*-*-aix5.2*] } {
            return 0
        }
        return [check_no_compiler_messages powerpc_altivec_ok object {
            int dummy;
        } "-maltivec"]
    } else {
        return 0
    }
}

# Return 1 if this is a PowerPC target that supports SPU.

proc check_effective_target_powerpc_spu { } {
    if [istarget powerpc*-*-linux*] {
        return [check_effective_target_powerpc_altivec_ok]
    } else {
        return 0
    }
}

# Return 1 if this is a PowerPC target with SPE enabled.

proc check_effective_target_powerpc_spe { } {
    if { [istarget powerpc*-*-*] } {
        return [check_no_compiler_messages powerpc_spe object {
            #ifndef __SPE__
            #error not SPE
            #else
            int dummy;
            #endif
        }]
    } else {
        return 0
    }
}

# Return 1 if this is a PowerPC target with Altivec enabled.

proc check_effective_target_powerpc_altivec { } {
    if { [istarget powerpc*-*-*] } {
        return [check_no_compiler_messages powerpc_altivec object {
            #ifndef __ALTIVEC__
            #error not Altivec
            #else
            int dummy;
            #endif
        }]
    } else {
        return 0
    }
}

# Return 1 if this is a SPU target with a toolchain that
# supports automatic overlay generation.

proc check_effective_target_spu_auto_overlay { } {
    if { [istarget spu*-*-elf*] } {
        return [check_no_compiler_messages spu_auto_overlay executable {
                int main (void) { }
                } "-Wl,--auto-overlay" ]
    } else {
        return 0
    }
}

# The VxWorks SPARC simulator accepts only EM_SPARC executables and
# chokes on EM_SPARC32PLUS or EM_SPARCV9 executables.  Return 1 if the
# test environment appears to run executables on such a simulator.

proc check_effective_target_ultrasparc_hw { } {
    return [check_runtime ultrasparc_hw {
        int main() { return 0; }
    } "-mcpu=ultrasparc"]
}

# Return 1 if the target supports hardware vector shift operation.

proc check_effective_target_vect_shift { } {
    global et_vect_shift_saved

    if [info exists et_vect_shift_saved] {
        verbose "check_effective_target_vect_shift: using cached result" 2
    } else {
        set et_vect_shift_saved 0
        if { ([istarget powerpc*-*-*]
             && ![istarget powerpc-*-linux*paired*])
             || [istarget ia64-*-*]
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*]
             || [check_effective_target_arm32] } {
           set et_vect_shift_saved 1
        }
    }

    verbose "check_effective_target_vect_shift: returning $et_vect_shift_saved" 2
    return $et_vect_shift_saved
}

# Return 1 if the target supports hardware vectors of long, 0 otherwise.
#
# This can change for different subtargets so do not cache the result.

proc check_effective_target_vect_long { } {
    if { [istarget i?86-*-*]
         || (([istarget powerpc*-*-*] 
              && ![istarget powerpc-*-linux*paired*]) 
              && [check_effective_target_ilp32])
         || [istarget x86_64-*-*]
         || [check_effective_target_arm32]
         || ([istarget sparc*-*-*] && [check_effective_target_ilp32]) } {
        set answer 1
    } else {
        set answer 0
    }

    verbose "check_effective_target_vect_long: returning $answer" 2
    return $answer
}

# Return 1 if the target supports hardware vectors of float, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_float { } {
    global et_vect_float_saved

    if [info exists et_vect_float_saved] {
        verbose "check_effective_target_vect_float: using cached result" 2
    } else {
        set et_vect_float_saved 0
        if { [istarget i?86-*-*]
              || [istarget powerpc*-*-*]
              || [istarget spu-*-*]
              || [istarget mipsisa64*-*-*]
              || [istarget x86_64-*-*]
              || [istarget ia64-*-*]
              || [check_effective_target_arm32] } {
           set et_vect_float_saved 1
        }
    }

    verbose "check_effective_target_vect_float: returning $et_vect_float_saved" 2
    return $et_vect_float_saved
}

# Return 1 if the target supports hardware vectors of double, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_double { } {
    global et_vect_double_saved

    if [info exists et_vect_double_saved] {
        verbose "check_effective_target_vect_double: using cached result" 2
    } else {
        set et_vect_double_saved 0
        if { [istarget i?86-*-*]
              || [istarget x86_64-*-*] 
              || [istarget spu-*-*] } {
           set et_vect_double_saved 1
        }
    }

    verbose "check_effective_target_vect_double: returning $et_vect_double_saved" 2
    return $et_vect_double_saved
}

# Return 1 if the target plus current options does not support a vector
# max instruction on "int", 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_no_int_max { } {
    global et_vect_no_int_max_saved

    if [info exists et_vect_no_int_max_saved] {
        verbose "check_effective_target_vect_no_int_max: using cached result" 2
    } else {
        set et_vect_no_int_max_saved 0
        if { [istarget sparc*-*-*]
             || [istarget spu-*-*]
             || [istarget alpha*-*-*] } {
            set et_vect_no_int_max_saved 1
        }
    }
    verbose "check_effective_target_vect_no_int_max: returning $et_vect_no_int_max_saved" 2
    return $et_vect_no_int_max_saved
}

# Return 1 if the target plus current options does not support a vector
# add instruction on "int", 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_no_int_add { } {
    global et_vect_no_int_add_saved

    if [info exists et_vect_no_int_add_saved] {
        verbose "check_effective_target_vect_no_int_add: using cached result" 2
    } else {
        set et_vect_no_int_add_saved 0
        # Alpha only supports vector add on V8QI and V4HI.
        if { [istarget alpha*-*-*] } {
            set et_vect_no_int_add_saved 1
        }
    }
    verbose "check_effective_target_vect_no_int_add: returning $et_vect_no_int_add_saved" 2
    return $et_vect_no_int_add_saved
}

# Return 1 if the target plus current options does not support vector
# bitwise instructions, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_no_bitwise { } {
    global et_vect_no_bitwise_saved

    if [info exists et_vect_no_bitwise_saved] {
        verbose "check_effective_target_vect_no_bitwise: using cached result" 2
    } else {
        set et_vect_no_bitwise_saved 0
    }
    verbose "check_effective_target_vect_no_bitwise: returning $et_vect_no_bitwise_saved" 2
    return $et_vect_no_bitwise_saved
}

# Return 1 if the target plus current options supports a vector
# widening summation of *short* args into *int* result, 0 otherwise.
# A target can also support this widening summation if it can support
# promotion (unpacking) from shorts to ints.
#
# This won't change for different subtargets so cache the result.
                                                                                                
proc check_effective_target_vect_widen_sum_hi_to_si { } {
    global et_vect_widen_sum_hi_to_si

    if [info exists et_vect_widen_sum_hi_to_si_saved] {
        verbose "check_effective_target_vect_widen_sum_hi_to_si: using cached result" 2
    } else {
        set et_vect_widen_sum_hi_to_si_saved [check_effective_target_vect_unpack]
        if { [istarget powerpc*-*-*] 
             || [istarget ia64-*-*] } {
            set et_vect_widen_sum_hi_to_si_saved 1
        }
    }
    verbose "check_effective_target_vect_widen_sum_hi_to_si: returning $et_vect_widen_sum_hi_to_si_saved" 2
    return $et_vect_widen_sum_hi_to_si_saved
}

# Return 1 if the target plus current options supports a vector
# widening summation of *char* args into *short* result, 0 otherwise.
# A target can also support this widening summation if it can support
# promotion (unpacking) from chars to shorts.
#
# This won't change for different subtargets so cache the result.
                                                                                                
proc check_effective_target_vect_widen_sum_qi_to_hi { } {
    global et_vect_widen_sum_qi_to_hi

    if [info exists et_vect_widen_sum_qi_to_hi_saved] {
        verbose "check_effective_target_vect_widen_sum_qi_to_hi: using cached result" 2
    } else {
        set et_vect_widen_sum_qi_to_hi_saved 0
        if { [check_effective_target_vect_unpack] 
             || [istarget ia64-*-*] } {
            set et_vect_widen_sum_qi_to_hi_saved 1
        }
    }
    verbose "check_effective_target_vect_widen_sum_qi_to_hi: returning $et_vect_widen_sum_qi_to_hi_saved" 2
    return $et_vect_widen_sum_qi_to_hi_saved
}

# Return 1 if the target plus current options supports a vector
# widening summation of *char* args into *int* result, 0 otherwise.
#
# This won't change for different subtargets so cache the result.
                                                                                                
proc check_effective_target_vect_widen_sum_qi_to_si { } {
    global et_vect_widen_sum_qi_to_si

    if [info exists et_vect_widen_sum_qi_to_si_saved] {
        verbose "check_effective_target_vect_widen_sum_qi_to_si: using cached result" 2
    } else {
        set et_vect_widen_sum_qi_to_si_saved 0
        if { [istarget powerpc*-*-*] } {
            set et_vect_widen_sum_qi_to_si_saved 1
        }
    }
    verbose "check_effective_target_vect_widen_sum_qi_to_si: returning $et_vect_widen_sum_qi_to_si_saved" 2
    return $et_vect_widen_sum_qi_to_si_saved
}

# Return 1 if the target plus current options supports a vector
# widening multiplication of *char* args into *short* result, 0 otherwise.
# A target can also support this widening multplication if it can support
# promotion (unpacking) from chars to shorts, and vect_short_mult (non-widening
# multiplication of shorts).
#
# This won't change for different subtargets so cache the result.


proc check_effective_target_vect_widen_mult_qi_to_hi { } {
    global et_vect_widen_mult_qi_to_hi

    if [info exists et_vect_widen_mult_qi_to_hi_saved] {
        verbose "check_effective_target_vect_widen_mult_qi_to_hi: using cached result" 2
    } else {
        if { [check_effective_target_vect_unpack]
             && [check_effective_target_vect_short_mult] } {
            set et_vect_widen_mult_qi_to_hi_saved 1
        } else {
            set et_vect_widen_mult_qi_to_hi_saved 0
        }
        if { [istarget powerpc*-*-*] } {
            set et_vect_widen_mult_qi_to_hi_saved 1
        }
    }
    verbose "check_effective_target_vect_widen_mult_qi_to_hi: returning $et_vect_widen_mult_qi_to_hi_saved" 2
    return $et_vect_widen_mult_qi_to_hi_saved
}

# Return 1 if the target plus current options supports a vector
# widening multiplication of *short* args into *int* result, 0 otherwise.
# A target can also support this widening multplication if it can support
# promotion (unpacking) from shorts to ints, and vect_int_mult (non-widening
# multiplication of ints).
#
# This won't change for different subtargets so cache the result.


proc check_effective_target_vect_widen_mult_hi_to_si { } {
    global et_vect_widen_mult_hi_to_si

    if [info exists et_vect_widen_mult_hi_to_si_saved] {
        verbose "check_effective_target_vect_widen_mult_hi_to_si: using cached result" 2
    } else {
        if { [check_effective_target_vect_unpack]
             && [check_effective_target_vect_int_mult] } {
          set et_vect_widen_mult_hi_to_si_saved 1
        } else {
          set et_vect_widen_mult_hi_to_si_saved 0
        }
        if { [istarget powerpc*-*-*]
              || [istarget spu-*-*]
              || [istarget i?86-*-*]
              || [istarget x86_64-*-*] } {
            set et_vect_widen_mult_hi_to_si_saved 1
        }
    }
    verbose "check_effective_target_vect_widen_mult_hi_to_si: returning $et_vect_widen_mult_hi_to_si_saved" 2
    return $et_vect_widen_mult_hi_to_si_saved
}

# Return 1 if the target plus current options supports a vector
# dot-product of signed chars, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_sdot_qi { } {
    global et_vect_sdot_qi

    if [info exists et_vect_sdot_qi_saved] {
        verbose "check_effective_target_vect_sdot_qi: using cached result" 2
    } else {
        set et_vect_sdot_qi_saved 0
    }
    verbose "check_effective_target_vect_sdot_qi: returning $et_vect_sdot_qi_saved" 2
    return $et_vect_sdot_qi_saved
}

# Return 1 if the target plus current options supports a vector
# dot-product of unsigned chars, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_udot_qi { } {
    global et_vect_udot_qi

    if [info exists et_vect_udot_qi_saved] {
        verbose "check_effective_target_vect_udot_qi: using cached result" 2
    } else {
        set et_vect_udot_qi_saved 0
        if { [istarget powerpc*-*-*] } {
            set et_vect_udot_qi_saved 1
        }
    }
    verbose "check_effective_target_vect_udot_qi: returning $et_vect_udot_qi_saved" 2
    return $et_vect_udot_qi_saved
}

# Return 1 if the target plus current options supports a vector
# dot-product of signed shorts, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_sdot_hi { } {
    global et_vect_sdot_hi

    if [info exists et_vect_sdot_hi_saved] {
        verbose "check_effective_target_vect_sdot_hi: using cached result" 2
    } else {
        set et_vect_sdot_hi_saved 0
        if { ([istarget powerpc*-*-*] && ![istarget powerpc-*-linux*paired*])
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*] } {
            set et_vect_sdot_hi_saved 1
        }
    }
    verbose "check_effective_target_vect_sdot_hi: returning $et_vect_sdot_hi_saved" 2
    return $et_vect_sdot_hi_saved
}

# Return 1 if the target plus current options supports a vector
# dot-product of unsigned shorts, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_udot_hi { } {
    global et_vect_udot_hi

    if [info exists et_vect_udot_hi_saved] {
        verbose "check_effective_target_vect_udot_hi: using cached result" 2
    } else {
        set et_vect_udot_hi_saved 0
        if { ([istarget powerpc*-*-*] && ![istarget powerpc-*-linux*paired*]) } {
            set et_vect_udot_hi_saved 1
        }
    }
    verbose "check_effective_target_vect_udot_hi: returning $et_vect_udot_hi_saved" 2
    return $et_vect_udot_hi_saved
}


# Return 1 if the target plus current options supports a vector
# demotion (packing) of shorts (to chars) and ints (to shorts) 
# using modulo arithmetic, 0 otherwise.
#
# This won't change for different subtargets so cache the result.
                                                                                
proc check_effective_target_vect_pack_trunc { } {
    global et_vect_pack_trunc
                                                                                
    if [info exists et_vect_pack_trunc_saved] {
        verbose "check_effective_target_vect_pack_trunc: using cached result" 2
    } else {
        set et_vect_pack_trunc_saved 0
        if { ([istarget powerpc*-*-*] && ![istarget powerpc-*-linux*paired*])
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*] } {
            set et_vect_pack_trunc_saved 1
        }
    }
    verbose "check_effective_target_vect_pack_trunc: returning $et_vect_pack_trunc_saved" 2
    return $et_vect_pack_trunc_saved
}

# Return 1 if the target plus current options supports a vector
# promotion (unpacking) of chars (to shorts) and shorts (to ints), 0 otherwise.
#
# This won't change for different subtargets so cache the result.
                                   
proc check_effective_target_vect_unpack { } {
    global et_vect_unpack
                                        
    if [info exists et_vect_unpack_saved] {
        verbose "check_effective_target_vect_unpack: using cached result" 2
    } else {
        set et_vect_unpack_saved 0
        if { ([istarget powerpc*-*-*] && ![istarget powerpc-*paired*])
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*] 
             || [istarget spu-*-*] } {
            set et_vect_unpack_saved 1
        }
    }
    verbose "check_effective_target_vect_unpack: returning $et_vect_unpack_saved" 2  
    return $et_vect_unpack_saved
}

# Return 1 if the target plus current options does not guarantee
# that its STACK_BOUNDARY is >= the reguired vector alignment.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_unaligned_stack { } {
    global et_unaligned_stack_saved

    if [info exists et_unaligned_stack_saved] {
        verbose "check_effective_target_unaligned_stack: using cached result" 2
    } else {
        set et_unaligned_stack_saved 0
    }
    verbose "check_effective_target_unaligned_stack: returning $et_unaligned_stack_saved" 2
    return $et_unaligned_stack_saved
}

# Return 1 if the target plus current options does not support a vector
# alignment mechanism, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_no_align { } {
    global et_vect_no_align_saved

    if [info exists et_vect_no_align_saved] {
        verbose "check_effective_target_vect_no_align: using cached result" 2
    } else {
        set et_vect_no_align_saved 0
        if { [istarget mipsisa64*-*-*]
             || [istarget sparc*-*-*]
             || [istarget ia64-*-*]
             || [check_effective_target_arm32] } { 
            set et_vect_no_align_saved 1
        }
    }
    verbose "check_effective_target_vect_no_align: returning $et_vect_no_align_saved" 2
    return $et_vect_no_align_saved
}

# Return 1 if arrays are aligned to the vector alignment
# boundary, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vect_aligned_arrays { } {
    global et_vect_aligned_arrays

    if [info exists et_vect_aligned_arrays_saved] {
        verbose "check_effective_target_vect_aligned_arrays: using cached result" 2
    } else {
        set et_vect_aligned_arrays_saved 0
        if { (([istarget x86_64-*-*]
              || [istarget i?86-*-*]) && [is-effective-target lp64])
              || [istarget spu-*-*] } {
            set et_vect_aligned_arrays_saved 1
        }
    }
    verbose "check_effective_target_vect_aligned_arrays: returning $et_vect_aligned_arrays_saved" 2
    return $et_vect_aligned_arrays_saved
}

# Return 1 if types of size 32 bit or less are naturally aligned
# (aligned to their type-size), 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_natural_alignment_32 { } {
    global et_natural_alignment_32

    if [info exists et_natural_alignment_32_saved] {
        verbose "check_effective_target_natural_alignment_32: using cached result" 2
    } else {
        # FIXME: 32bit powerpc: guaranteed only if MASK_ALIGN_NATURAL/POWER.
        set et_natural_alignment_32_saved 1
        if { ([istarget *-*-darwin*] && [is-effective-target lp64]) } {
            set et_natural_alignment_32_saved 0
        }
    }
    verbose "check_effective_target_natural_alignment_32: returning $et_natural_alignment_32_saved" 2
    return $et_natural_alignment_32_saved
}

# Return 1 if types of size 64 bit or less are naturally aligned (aligned to their
# type-size), 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_natural_alignment_64 { } {
    global et_natural_alignment_64

    if [info exists et_natural_alignment_64_saved] {
        verbose "check_effective_target_natural_alignment_64: using cached result" 2
    } else {
        set et_natural_alignment_64_saved 0
        if { ([is-effective-target lp64] && ![istarget *-*-darwin*])
             || [istarget spu-*-*] } {
            set et_natural_alignment_64_saved 1
        }
    }
    verbose "check_effective_target_natural_alignment_64: returning $et_natural_alignment_64_saved" 2
    return $et_natural_alignment_64_saved
}

# Return 1 if vector alignment (for types of size 32 bit or less) is reachable, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vector_alignment_reachable { } {
    global et_vector_alignment_reachable

    if [info exists et_vector_alignment_reachable_saved] {
        verbose "check_effective_target_vector_alignment_reachable: using cached result" 2
    } else {
        if { [check_effective_target_vect_aligned_arrays]
             || [check_effective_target_natural_alignment_32] } {
            set et_vector_alignment_reachable_saved 1
        } else {
            set et_vector_alignment_reachable_saved 0
        }
    }
    verbose "check_effective_target_vector_alignment_reachable: returning $et_vector_alignment_reachable_saved" 2
    return $et_vector_alignment_reachable_saved
}

# Return 1 if vector alignment for 64 bit is reachable, 0 otherwise.
#
# This won't change for different subtargets so cache the result.

proc check_effective_target_vector_alignment_reachable_for_64bit { } {
    global et_vector_alignment_reachable_for_64bit

    if [info exists et_vector_alignment_reachable_for_64bit_saved] {
        verbose "check_effective_target_vector_alignment_reachable_for_64bit: using cached result" 2
    } else {
        if { [check_effective_target_vect_aligned_arrays] 
             || [check_effective_target_natural_alignment_64] } {
            set et_vector_alignment_reachable_for_64bit_saved 1
        } else {
            set et_vector_alignment_reachable_for_64bit_saved 0
        }
    }
    verbose "check_effective_target_vector_alignment_reachable_for_64bit: returning $et_vector_alignment_reachable_for_64bit_saved" 2
    return $et_vector_alignment_reachable_for_64bit_saved
}

# Return 1 if the target supports vector conditional operations, 0 otherwise.

proc check_effective_target_vect_condition { } {
    global et_vect_cond_saved

    if [info exists et_vect_cond_saved] {
        verbose "check_effective_target_vect_cond: using cached result" 2
    } else {
        set et_vect_cond_saved 0
        if { [istarget powerpc*-*-*]
             || [istarget ia64-*-*]
             || [istarget i?86-*-*]
             || [istarget spu-*-*]
             || [istarget x86_64-*-*] } {
           set et_vect_cond_saved 1
        }
    }

    verbose "check_effective_target_vect_cond: returning $et_vect_cond_saved" 2
    return $et_vect_cond_saved
}

# Return 1 if the target supports vector char multiplication, 0 otherwise.

proc check_effective_target_vect_char_mult { } {
    global et_vect_char_mult_saved

    if [info exists et_vect_char_mult_saved] {
        verbose "check_effective_target_vect_char_mult: using cached result" 2
    } else {
        set et_vect_char_mult_saved 0
        if { [istarget ia64-*-*]
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*] } {
           set et_vect_char_mult_saved 1
        }
    }

    verbose "check_effective_target_vect_char_mult: returning $et_vect_char_mult_saved" 2
    return $et_vect_char_mult_saved
}

# Return 1 if the target supports vector short multiplication, 0 otherwise.

proc check_effective_target_vect_short_mult { } {
    global et_vect_short_mult_saved

    if [info exists et_vect_short_mult_saved] {
        verbose "check_effective_target_vect_short_mult: using cached result" 2
    } else {
        set et_vect_short_mult_saved 0
        if { [istarget ia64-*-*]
             || [istarget spu-*-*]
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*] } {
           set et_vect_short_mult_saved 1
        }
    }

    verbose "check_effective_target_vect_short_mult: returning $et_vect_short_mult_saved" 2
    return $et_vect_short_mult_saved
}

# Return 1 if the target supports vector int multiplication, 0 otherwise.

proc check_effective_target_vect_int_mult { } {
    global et_vect_int_mult_saved

    if [info exists et_vect_int_mult_saved] {
        verbose "check_effective_target_vect_int_mult: using cached result" 2
    } else {
        set et_vect_int_mult_saved 0
        if { ([istarget powerpc*-*-*] && ![istarget powerpc-*-linux*paired*])
             || [istarget spu-*-*]
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*]
             || [check_effective_target_arm32] } {
           set et_vect_int_mult_saved 1
        }
    }

    verbose "check_effective_target_vect_int_mult: returning $et_vect_int_mult_saved" 2
    return $et_vect_int_mult_saved
}

# Return 1 if the target supports vector even/odd elements extraction, 0 otherwise.

proc check_effective_target_vect_extract_even_odd { } {
    global et_vect_extract_even_odd_saved
    
    if [info exists et_vect_extract_even_odd_saved] {
        verbose "check_effective_target_vect_extract_even_odd: using cached result" 2
    } else {
        set et_vect_extract_even_odd_saved 0 
        if { [istarget powerpc*-*-*] } {
           set et_vect_extract_even_odd_saved 1
        }
    }

    verbose "check_effective_target_vect_extract_even_odd: returning $et_vect_extract_even_odd_saved" 2
    return $et_vect_extract_even_odd_saved
}

# Return 1 if the target supports vector even/odd elements extraction of
# vectors with SImode elements or larger, 0 otherwise.

proc check_effective_target_vect_extract_even_odd_wide { } {
    global et_vect_extract_even_odd_wide_saved
    
    if [info exists et_vect_extract_even_odd_wide_saved] {
        verbose "check_effective_target_vect_extract_even_odd_wide: using cached result" 2
    } else {
        set et_vect_extract_even_odd_wide_saved 0 
        if { [istarget powerpc*-*-*] 
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*] } {
           set et_vect_extract_even_odd_wide_saved 1
        }
    }

    verbose "check_effective_target_vect_extract_even_wide_odd: returning $et_vect_extract_even_odd_wide_saved" 2
    return $et_vect_extract_even_odd_wide_saved
}

# Return 1 if the target supports vector interleaving, 0 otherwise.

proc check_effective_target_vect_interleave { } {
    global et_vect_interleave_saved
    
    if [info exists et_vect_interleave_saved] {
        verbose "check_effective_target_vect_interleave: using cached result" 2
    } else {
        set et_vect_interleave_saved 0
        if { [istarget powerpc*-*-*]
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*] } {
           set et_vect_interleave_saved 1
        }
    }

    verbose "check_effective_target_vect_interleave: returning $et_vect_interleave_saved" 2
    return $et_vect_interleave_saved
}

# Return 1 if the target supports vector interleaving and extract even/odd, 0 otherwise.
proc check_effective_target_vect_strided { } {
    global et_vect_strided_saved

    if [info exists et_vect_strided_saved] {
        verbose "check_effective_target_vect_strided: using cached result" 2
    } else {
        set et_vect_strided_saved 0
        if { [check_effective_target_vect_interleave]
             && [check_effective_target_vect_extract_even_odd] } {
           set et_vect_strided_saved 1
        }
    }

    verbose "check_effective_target_vect_strided: returning $et_vect_strided_saved" 2
    return $et_vect_strided_saved
}

# Return 1 if the target supports vector interleaving and extract even/odd
# for wide element types, 0 otherwise.
proc check_effective_target_vect_strided_wide { } {
    global et_vect_strided_wide_saved

    if [info exists et_vect_strided_wide_saved] {
        verbose "check_effective_target_vect_strided_wide: using cached result" 2
    } else {
        set et_vect_strided_wide_saved 0
        if { [check_effective_target_vect_interleave]
             && [check_effective_target_vect_extract_even_odd_wide] } {
           set et_vect_strided_wide_saved 1
        }
    }

    verbose "check_effective_target_vect_strided_wide: returning $et_vect_strided_wide_saved" 2
    return $et_vect_strided_wide_saved
}

# Return 1 if the target supports section-anchors

proc check_effective_target_section_anchors { } {
    global et_section_anchors_saved

    if [info exists et_section_anchors_saved] {
        verbose "check_effective_target_section_anchors: using cached result" 2
    } else {
        set et_section_anchors_saved 0
        if { [istarget powerpc*-*-*] } {
           set et_section_anchors_saved 1
        }
    }

    verbose "check_effective_target_section_anchors: returning $et_section_anchors_saved" 2
    return $et_section_anchors_saved
}

# Return 1 if the target supports atomic operations on "int" and "long".

proc check_effective_target_sync_int_long { } {
    global et_sync_int_long_saved

    if [info exists et_sync_int_long_saved] {
        verbose "check_effective_target_sync_int_long: using cached result" 2
    } else {
        set et_sync_int_long_saved 0
# This is intentionally powerpc but not rs6000, rs6000 doesn't have the
# load-reserved/store-conditional instructions.
        if { [istarget ia64-*-*]
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*]
             || [istarget alpha*-*-*] 
             || [istarget s390*-*-*] 
             || [istarget powerpc*-*-*]
             || [istarget sparc64-*-*]
             || [istarget sparcv9-*-*]
             || [istarget mips*-*-*] } {
           set et_sync_int_long_saved 1
        }
    }

    verbose "check_effective_target_sync_int_long: returning $et_sync_int_long_saved" 2
    return $et_sync_int_long_saved
}

# Return 1 if the target supports atomic operations on "char" and "short".

proc check_effective_target_sync_char_short { } {
    global et_sync_char_short_saved

    if [info exists et_sync_char_short_saved] {
        verbose "check_effective_target_sync_char_short: using cached result" 2
    } else {
        set et_sync_char_short_saved 0
# This is intentionally powerpc but not rs6000, rs6000 doesn't have the
# load-reserved/store-conditional instructions.
        if { [istarget ia64-*-*]
             || [istarget i?86-*-*]
             || [istarget x86_64-*-*]
             || [istarget alpha*-*-*] 
             || [istarget s390*-*-*] 
             || [istarget powerpc*-*-*]
             || [istarget sparc64-*-*]
             || [istarget sparcv9-*-*]
             || [istarget mips*-*-*] } {
           set et_sync_char_short_saved 1
        }
    }

    verbose "check_effective_target_sync_char_short: returning $et_sync_char_short_saved" 2
    return $et_sync_char_short_saved
}

# Return 1 if the target uses a ColdFire FPU.

proc check_effective_target_coldfire_fpu { } {
    return [check_no_compiler_messages coldfire_fpu assembly {
        #ifndef __mcffpu__
        #error FOO
        #endif
    }]
}

# Return true if this is a uClibc target.

proc check_effective_target_uclibc {} {
    return [check_no_compiler_messages uclibc object {
        #include <features.h>
        #if !defined (__UCLIBC__)
        #error FOO
        #endif
    }]
}

# Return true if this is a uclibc target and if the uclibc feature
# described by __$feature__ is not present.

proc check_missing_uclibc_feature {feature} {
    return [check_no_compiler_messages $feature object "
        #include <features.h>
        #if !defined (__UCLIBC) || defined (__${feature}__)
        #error FOO
        #endif
    "]
}

# Return true if this is a Newlib target.

proc check_effective_target_newlib {} {
    return [check_no_compiler_messages newlib object {
        #include <newlib.h>
    }]
}

# Return 1 if
#   (a) an error of a few ULP is expected in string to floating-point
#       conversion functions; and
#   (b) overflow is not always detected correctly by those functions.

proc check_effective_target_lax_strtofp {} {
    # By default, assume that all uClibc targets suffer from this.
    return [check_effective_target_uclibc]
}

# Return 1 if this is a target for which wcsftime is a dummy
# function that always returns 0.

proc check_effective_target_dummy_wcsftime {} {
    # By default, assume that all uClibc targets suffer from this.
    return [check_effective_target_uclibc]
}

# Return 1 if constructors with initialization priority arguments are
# supposed on this target.

proc check_effective_target_init_priority {} {
    return [check_no_compiler_messages init_priority assembly "
        void f() __attribute__((constructor (1000)));
        void f() \{\}
    "]
}

# Return 1 if the target matches the effective target 'arg', 0 otherwise.
# This can be used with any check_* proc that takes no argument and
# returns only 1 or 0.  It could be used with check_* procs that take
# arguments with keywords that pass particular arguments.

proc is-effective-target { arg } {
    set selected 0
    if { [info procs check_effective_target_${arg}] != [list] } {
        set selected [check_effective_target_${arg}]
    } else {
        switch $arg {
          "vmx_hw"         { set selected [check_vmx_hw_available] }
          "named_sections" { set selected [check_named_sections_available] }
          "gc_sections"    { set selected [check_gc_sections_available] }
          "cxa_atexit"     { set selected [check_cxa_atexit_available] }
          default          { error "unknown effective target keyword `$arg'" }
        }
    }
    verbose "is-effective-target: $arg $selected" 2
    return $selected
}

# Return 1 if the argument is an effective-target keyword, 0 otherwise.

proc is-effective-target-keyword { arg } {
    if { [info procs check_effective_target_${arg}] != [list] } {
        return 1
    } else {
        # These have different names for their check_* procs.
        switch $arg {
          "vmx_hw"         { return 1 }
          "named_sections" { return 1 }
          "gc_sections"    { return 1 }
          "cxa_atexit"     { return 1 }
          default          { return 0 }
        }
    }
}

# Return 1 if target default to short enums

proc check_effective_target_short_enums { } {
    return [check_no_compiler_messages short_enums assembly {
        enum foo { bar };
        int s[sizeof (enum foo) == 1 ? 1 : -1];
    }]
}

# Return 1 if target supports merging string constants at link time.

proc check_effective_target_string_merging { } {
    return [check_no_messages_and_pattern string_merging \
                "rodata\\.str" assembly {
                    const char *var = "String";
                } {-O2}]
}

# Return 1 if target has the basic signed and unsigned types in
# <stdint.h>, 0 otherwise.

proc check_effective_target_stdint_types { } {
    return [check_no_compiler_messages stdint_types assembly {
        #include <stdint.h>
        int8_t a; int16_t b; int32_t c; int64_t d;
        uint8_t e; uint16_t f; uint32_t g; uint64_t h;
    }]
}

# Return 1 if programs are intended to be run on a simulator
# (i.e. slowly) rather than hardware (i.e. fast).

proc check_effective_target_simulator { } {

    # All "src/sim" simulators set this one.
    if [board_info target exists is_simulator] {
        return [board_info target is_simulator]
    }

    # The "sid" simulators don't set that one, but at least they set
    # this one.
    if [board_info target exists slow_simulator] {
        return [board_info target slow_simulator]
    }

    return 0
}

# Return 1 if the target is a VxWorks kernel.

proc check_effective_target_vxworks_kernel { } {
    return [check_no_compiler_messages vxworks_kernel assembly {
        #if !defined __vxworks || defined __RTP__
        #error NO
        #endif
    }]
}

# Return 1 if the target is a VxWorks RTP.

proc check_effective_target_vxworks_rtp { } {
    return [check_no_compiler_messages vxworks_rtp assembly {
        #if !defined __vxworks || !defined __RTP__
        #error NO
        #endif
    }]
}

# Return 1 if the target is expected to provide wide character support.

proc check_effective_target_wchar { } {
    if {[check_missing_uclibc_feature UCLIBC_HAS_WCHAR]} {
        return 0
    }
    return [check_no_compiler_messages wchar assembly {
        #include <wchar.h>
    }]
}

# Return 1 if the target has <pthread.h>.

proc check_effective_target_pthread_h { } {
    return [check_no_compiler_messages pthread_h assembly {
        #include <pthread.h>
    }]
}

# Return 1 if the target can truncate a file from a file-descriptor,
# as used by libgfortran/io/unix.c:fd_truncate; i.e. ftruncate or
# chsize.  We test for a trivially functional truncation; no stubs.
# As libgfortran uses _FILE_OFFSET_BITS 64, we do too; it'll cause a
# different function to be used.

proc check_effective_target_fd_truncate { } {
    set prog {
        #define _FILE_OFFSET_BITS 64
        #include <unistd.h>
        #include <stdio.h>
        #include <stdlib.h>
        int main ()
        {
          FILE *f = fopen ("tst.tmp", "wb");
          int fd;
          const char t[] = "test writing more than ten characters";
          char s[11];
          fd =  fileno (f);
          write (fd, t, sizeof (t) - 1);
          lseek (fd, 0, 0);
          if (ftruncate (fd, 10) != 0)
            exit (1);
          close (fd);
          f = fopen ("tst.tmp", "rb");
          if (fread (s, 1, sizeof (s), f) != 10 || strncmp (s, t, 10) != 0)
            exit (1);
          exit (0);
        }
    }

    if { [check_runtime ftruncate $prog] } {
      return 1;
    }

    regsub "ftruncate" $prog "chsize" prog
    return [check_runtime chsize $prog]
}

# Add to FLAGS all the target-specific flags needed to access the c99 runtime.

proc add_options_for_c99_runtime { flags } {
    if { [istarget *-*-solaris2*] } {
        return "$flags -std=c99"
    }
    if { [istarget powerpc-*-darwin*] } {
        return "$flags -mmacosx-version-min=10.3"
    }
    return $flags
}

# Return 1 if the target provides a full C99 runtime.

proc check_effective_target_c99_runtime { } {
    return [check_cached_effective_target c99_runtime {
        global srcdir

        set file [open "$srcdir/gcc.dg/builtins-config.h"]
        set contents [read $file]
        close $file
        append contents {
            #ifndef HAVE_C99_RUNTIME
            #error FOO
            #endif
        }
        check_no_compiler_messages_nocache c99_runtime assembly \
            $contents [add_options_for_c99_runtime ""]
    }]
}

# Return 1 if  target wchar_t is at least 4 bytes.

proc check_effective_target_4byte_wchar_t { } {
    return [check_no_compiler_messages 4byte_wchar_t object {
        int dummy[sizeof (__WCHAR_TYPE__) >= 4 ? 1 : -1];
    }]
}

# Return 1 if the target supports automatic stack alignment.

proc check_effective_target_automatic_stack_alignment  { } {
    if { [istarget i?86*-*-*]
         || [istarget x86_64-*-*] } then {
        return 1
    } else {
        return 0
    }
}