1 # Copyright (C) 1999, 2001, 2003 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 ###############################
23 # proc check_weak_available { }
24 ###############################
26 # weak symbols are only supported in some configs/object formats
27 # this proc returns 1 if they're supported, 0 if they're not, or -1 if unsure
29 proc check_weak_available { } {
33 # All mips targets should support it
35 if { [ string first "mips" $target_cpu ] >= 0 } {
39 # All solaris2 targets should support it
41 if { [regexp ".*-solaris2.*" $target_triplet] } {
45 # DEC OSF/1/Digital UNIX/Tru64 UNIX supports it
47 if { [regexp "alpha.*osf.*" $target_triplet] } {
51 # ELF and ECOFF support it. a.out does with gas/gld but may also with
52 # other linkers, so we should try it
54 set objformat [gcc_target_object_format]
65 ###############################
66 # proc check_visibility_available { }
67 ###############################
69 # The visibility attribute is only support in some object formats
70 # This proc returns 1 if it is supported, 0 if not, -1 if unsure.
72 proc check_visibility_available { } {
76 # ELF supports it if the system has recent GNU ld and gas.
77 # As a start we return 1 for all ELF systems; we'll let people
78 # add exceptions as necessary.
80 set objformat [gcc_target_object_format]
89 ###############################
90 # proc check_alias_available { }
91 ###############################
93 # Determine if the target toolchain supports the alias attribute.
95 # Returns 2 if the target supports aliases. Returns 1 if the target
96 # only supports weak aliased. Returns 0 if the target does not
97 # support aliases at all. Returns -1 if support for aliases could not
100 proc check_alias_available { } {
101 global alias_available_saved
104 if [info exists alias_available_saved] {
105 verbose "check_alias_available returning saved $alias_available_saved" 2
107 verbose "check_alias_available compiling testfile" 2
108 set f [open "tmp.c" "w"]
109 # Compile a small test program. The definition of "g" is
110 # necessary to keep the Solaris assembler from complaining
112 puts $f "void g() {} void f() __attribute__((alias(\"g\")));"
114 set lines [${tool}_target_compile "tmp.c" "tmp.o" object ""]
117 if [string match "" $lines] then {
118 # No error messages, everything is OK.
119 set alias_available_saved 2
121 if [regexp "alias definitions not supported" $lines] {
122 verbose "check_alias_available target does not support aliases" 2
124 set objformat [gcc_target_object_format]
126 if { $objformat == "elf" } {
127 verbose "check_alias_available but target uses ELF format, so it ought to" 2
128 set alias_available_saved -1
130 set alias_available_saved 0
133 if [regexp "only weak aliases are supported" $lines] {
134 verbose "check_alias_available target supports only weak aliases" 2
135 set alias_available_saved 1
137 set alias_available_saved -1
142 verbose "check_alias_available returning $alias_available_saved" 2
145 return $alias_available_saved
148 # Returns true if --gc-sections is supported on the target.
150 proc check_gc_sections_available { } {
151 global gc_sections_available_saved
154 if {![info exists gc_sections_available_saved]} {
155 # Check if the ld used by gcc supports --gc-sections.
156 set gcc_ld [lindex [${tool}_target_compile "-print-prog-name=ld" "" "none" ""] 0]
157 set ld_output [remote_exec host "$gcc_ld" "--help"]
158 if { [ string first "--gc-sections" $ld_output ] >= 0 } {
159 set gc_sections_available_saved 1
161 set gc_sections_available_saved 0
164 return $gc_sections_available_saved
167 # Return true if profiling is supported on the target.
169 proc check_profiling_available { } {
170 global profiling_available_saved
172 if {![info exists profiling_available_saved]} {
173 # Some targets don't have any implementation of __bb_init_func or are
174 # missing other needed machinery.
175 if { [istarget mmix-*-*]
176 || [istarget arm*-*-elf]
177 || [istarget strongarm*-*-elf]
178 || [istarget xscale*-*-elf]
179 || [istarget cris-*-*]
180 || [istarget h8300-*-*]
181 || [istarget *-*-windiss] } {
182 set profiling_available_saved 0
184 set profiling_available_saved 1
188 return $profiling_available_saved