1 # Copyright (C) 1999, 2001, 2003, 2004 Free Software Foundation, Inc.
3 # This program is free software; you can redistribute it and/or modify
4 # it under the terms of the GNU General Public License as published by
5 # the Free Software Foundation; either version 2 of the License, or
6 # (at your option) any later version.
8 # This program is distributed in the hope that it will be useful,
9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 # GNU General Public License for more details.
13 # You should have received a copy of the GNU General Public License
14 # along with this program; if not, write to the Free Software
15 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 # Please email any bugs, comments, and/or additions to this file to:
18 # gcc-patches@gcc.gnu.org
20 # This file defines procs for determining features supported by the target.
22 # Try to compile some code and return the messages printed by the compiler.
24 # BASENAME is a basename to use for temporary files.
25 # TYPE is the type of compilation to perform (see target_compile).
26 # CONTENTS gives the contents of the input file.
27 proc get_compiler_messages {basename type contents} {
30 set src ${basename}[pid].c
32 assembly { set output ${basename}[pid].s }
33 object { set output ${basename}[pid].o }
38 set lines [${tool}_target_compile $src $output $type ""]
40 remote_file build delete $output
45 ###############################
46 # proc check_weak_available { }
47 ###############################
49 # weak symbols are only supported in some configs/object formats
50 # this proc returns 1 if they're supported, 0 if they're not, or -1 if unsure
52 proc check_weak_available { } {
56 # All mips targets should support it
58 if { [ string first "mips" $target_cpu ] >= 0 } {
62 # All solaris2 targets should support it
64 if { [regexp ".*-solaris2.*" $target_triplet] } {
68 # DEC OSF/1/Digital UNIX/Tru64 UNIX supports it
70 if { [regexp "alpha.*osf.*" $target_triplet] } {
74 # Windows targets Cygwin and MingW32 support it
76 if { [regexp ".*mingw32|.*cygwin" $target_triplet] } {
80 # ELF and ECOFF support it. a.out does with gas/gld but may also with
81 # other linkers, so we should try it
83 set objformat [gcc_target_object_format]
95 ###############################
96 # proc check_visibility_available { }
97 ###############################
99 # The visibility attribute is only support in some object formats
100 # This proc returns 1 if it is supported, 0 if not, -1 if unsure.
102 proc check_visibility_available { } {
103 global target_triplet
106 # On NetWare, support makes no sense.
108 if { [string match "*-*-netware*" $target_triplet] } {
112 # ELF supports it if the system has recent GNU ld and gas.
113 # As a start we return 1 for all ELF systems; we'll let people
114 # add exceptions as necessary.
116 set objformat [gcc_target_object_format]
121 unknown { return -1 }
126 ###############################
127 # proc check_alias_available { }
128 ###############################
130 # Determine if the target toolchain supports the alias attribute.
132 # Returns 2 if the target supports aliases. Returns 1 if the target
133 # only supports weak aliased. Returns 0 if the target does not
134 # support aliases at all. Returns -1 if support for aliases could not
137 proc check_alias_available { } {
138 global alias_available_saved
141 if [info exists alias_available_saved] {
142 verbose "check_alias_available returning saved $alias_available_saved" 2
146 verbose "check_alias_available compiling testfile $src" 2
147 set f [open $src "w"]
148 # Compile a small test program. The definition of "g" is
149 # necessary to keep the Solaris assembler from complaining
151 puts $f "#ifdef __cplusplus\nextern \"C\"\n#endif\n"
152 puts $f "void g() {} void f() __attribute__((alias(\"g\")));"
154 set lines [${tool}_target_compile $src $obj object ""]
156 remote_file build delete $obj
158 if [string match "" $lines] then {
159 # No error messages, everything is OK.
160 set alias_available_saved 2
162 if [regexp "alias definitions not supported" $lines] {
163 verbose "check_alias_available target does not support aliases" 2
165 set objformat [gcc_target_object_format]
167 if { $objformat == "elf" } {
168 verbose "check_alias_available but target uses ELF format, so it ought to" 2
169 set alias_available_saved -1
171 set alias_available_saved 0
174 if [regexp "only weak aliases are supported" $lines] {
175 verbose "check_alias_available target supports only weak aliases" 2
176 set alias_available_saved 1
178 set alias_available_saved -1
183 verbose "check_alias_available returning $alias_available_saved" 2
186 return $alias_available_saved
189 # Returns true if --gc-sections is supported on the target.
191 proc check_gc_sections_available { } {
192 global gc_sections_available_saved
195 if {![info exists gc_sections_available_saved]} {
196 # Check if the ld used by gcc supports --gc-sections.
197 set gcc_spec [${tool}_target_compile "-dumpspecs" "" "none" ""]
198 regsub ".*\n\*linker:\[ \t\]*\n(\[^ \t\n\]*).*" "$gcc_spec" {\1} linker
199 set gcc_ld [lindex [${tool}_target_compile "-print-prog-name=$linker" "" "none" ""] 0]
200 set ld_output [remote_exec host "$gcc_ld" "--help"]
201 if { [ string first "--gc-sections" $ld_output ] >= 0 } {
202 set gc_sections_available_saved 1
204 set gc_sections_available_saved 0
207 return $gc_sections_available_saved
210 # Return true if profiling is supported on the target.
212 proc check_profiling_available { test_what } {
213 global profiling_available_saved
215 verbose "Profiling argument is <$test_what>" 1
217 # These conditions depend on the argument so examine them before
218 # looking at the cache variable.
220 # Support for -p on solaris2 relies on mcrt1.o which comes with the
221 # vendor compiler. We cannot reliably predict the directory where the
222 # vendor compiler (and thus mcrt1.o) is installed so we can't
223 # necessarily find mcrt1.o even if we have it.
224 if { [istarget *-*-solaris2*] && [lindex $test_what 1] == "-p" } {
228 # Support for -p on irix relies on libprof1.a which doesn't appear to
229 # exist on any irix6 system currently posting testsuite results.
230 # Support for -pg on irix relies on gcrt1.o which doesn't exist yet.
231 # See: http://gcc.gnu.org/ml/gcc/2002-10/msg00169.html
232 if { [istarget mips*-*-irix*]
233 && ([lindex $test_what 1] == "-p" || [lindex $test_what 1] == "-pg") } {
237 # Now examine the cache variable.
238 if {![info exists profiling_available_saved]} {
239 # Some targets don't have any implementation of __bb_init_func or are
240 # missing other needed machinery.
241 if { [istarget mmix-*-*]
242 || [istarget arm*-*-eabi*]
243 || [istarget arm*-*-elf]
244 || [istarget arm*-*-symbianelf*]
245 || [istarget powerpc-*-eabi*]
246 || [istarget strongarm*-*-elf]
247 || [istarget xscale*-*-elf]
248 || [istarget cris-*-*]
249 || [istarget h8300-*-*]
250 || [istarget mips*-*-elf]
251 || [istarget *-*-windiss] } {
252 set profiling_available_saved 0
254 set profiling_available_saved 1
258 return $profiling_available_saved
261 # Return true if iconv is supported on the target. In particular IBM-1047.
263 proc check_iconv_available { test_what } {
271 verbose "check_iconv_available compiling testfile $src" 2
272 set f [open $src "w"]
273 # Compile a small test program.
274 puts $f "#include <iconv.h>\n"
275 puts $f "int main (void)\n {\n iconv_t cd; \n"
276 puts $f "cd = iconv_open (\"[lindex $test_what 1]\", \"UTF-8\");\n"
277 puts $f "if (cd == (iconv_t) -1)\n return 1;\n"
278 puts $f "return 0;\n}"
281 set lines [${tool}_target_compile $src $exe executable "libs=$libiconv" ]
284 if [string match "" $lines] then {
285 # No error messages, everything is OK.
287 set result [${tool}_load "./$exe" "" ""]
288 set status [lindex $result 0];
289 remote_file build delete $exe
291 verbose "check_iconv_available status is <$status>" 2
293 if { $status == "pass" } then {
301 # Return true if named sections are supported on this target.
302 # This proc does not cache results, because the answer may vary
303 # when cycling over subtarget options (e.g. irix o32/n32/n64) in
305 proc check_named_sections_available { } {
306 verbose "check_named_sections_available: compiling source" 2
307 set answer [string match "" [get_compiler_messages named object {
308 int __attribute__ ((section("whatever"))) foo;
310 verbose "check_named_sections_available: returning $answer" 2
314 # Return 1 if the target supports executing AltiVec instructions, 0
315 # otherwise. Cache the result.
317 proc check_vmx_hw_available { } {
318 global vmx_hw_available_saved
321 if [info exists vmx_hw_available_saved] {
322 verbose "check_hw_available returning saved $vmx_hw_available_saved" 2
324 set vmx_hw_available_saved 0
326 # Some simulators are known to not support VMX instructions.
327 if { [istarget powerpc-*-eabi] || [istarget powerpc*-*-eabispe] } {
328 verbose "check_hw_available returning 0" 2
329 return $vmx_hw_available_saved
332 # Set up, compile, and execute a test program containing VMX
333 # instructions. Include the current process ID in the file
334 # names to prevent conflicts with invocations for multiple
339 set f [open $src "w"]
340 puts $f "int main() {"
341 puts $f "#ifdef __MACH__"
342 puts $f " asm volatile (\"vor v0,v0,v0\");"
344 puts $f " asm volatile (\"vor 0,0,0\");"
346 puts $f " return 0; }"
349 verbose "check_vmx_hw_available compiling testfile $src" 2
350 set lines [${tool}_target_compile $src $exe executable ""]
353 if [string match "" $lines] then {
354 # No error message, compilation succeeded.
355 set result [${tool}_load "./$exe" "" ""]
356 set status [lindex $result 0]
357 remote_file build delete $exe
358 verbose "check_vmx_hw_available testfile status is <$status>" 2
360 if { $status == "pass" } then {
361 set vmx_hw_available_saved 1
364 verbose "check_vmx_hw_availalble testfile compilation failed" 2
368 return $vmx_hw_available_saved
371 # Return 1 if we're generating 32-bit code using default options, 0
374 proc check_effective_target_ilp32 { } {
375 verbose "check_effective_target_ilp32: compiling source" 2
376 set answer [string match "" [get_compiler_messages ilp32 object {
377 int dummy[(sizeof (int) == 4 && sizeof (void *) == 4 && sizeof (long) == 4 ) ? 1 : -1];
379 verbose "check_effective_target_ilp32: returning $answer" 2
383 # Return 1 if we're generating 64-bit code using default options, 0
386 proc check_effective_target_lp64 { } {
387 verbose "check_effective_target_lp64: compiling source" 2
388 set answer [string match "" [get_compiler_messages lp64 object {
389 int dummy[(sizeof (int) == 4 && sizeof (void *) == 8 && sizeof (long) == 8 ) ? 1 : -1];
391 verbose "check_effective_target_lp64: returning $answer" 2
395 # Return 1 if the target matches the effective target 'arg', 0 otherwise.
396 # This can be used with any check_* proc that takes no argument and
397 # returns only 1 or 0. It could be used with check_* procs that take
398 # arguments with keywords that pass particular arguments.
400 proc is-effective-target { arg } {
403 "ilp32" { set selected [check_effective_target_ilp32] }
404 "lp64" { set selected [check_effective_target_lp64] }
405 "vmx_hw" { set selected [check_vmx_hw_available] }
406 "named_sections" { set selected [check_named_sections_available] }
407 "gc_sections" { set selected [check_gc_sections_available] }
408 default { error "unknown effective target selector `$arg'" }
410 verbose "is-effective-target: $arg $selected" 2