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 "#ifdef __cplusplus\nextern \"C\"\n#endif\n"
113 puts $f "void g() {} void f() __attribute__((alias(\"g\")));"
115 set lines [${tool}_target_compile "tmp.c" "tmp.o" object ""]
118 if [string match "" $lines] then {
119 # No error messages, everything is OK.
120 set alias_available_saved 2
122 if [regexp "alias definitions not supported" $lines] {
123 verbose "check_alias_available target does not support aliases" 2
125 set objformat [gcc_target_object_format]
127 if { $objformat == "elf" } {
128 verbose "check_alias_available but target uses ELF format, so it ought to" 2
129 set alias_available_saved -1
131 set alias_available_saved 0
134 if [regexp "only weak aliases are supported" $lines] {
135 verbose "check_alias_available target supports only weak aliases" 2
136 set alias_available_saved 1
138 set alias_available_saved -1
143 verbose "check_alias_available returning $alias_available_saved" 2
146 return $alias_available_saved
149 # Returns true if --gc-sections is supported on the target.
151 proc check_gc_sections_available { } {
152 global gc_sections_available_saved
155 if {![info exists gc_sections_available_saved]} {
156 # Check if the ld used by gcc supports --gc-sections.
157 set gcc_ld [lindex [${tool}_target_compile "-print-prog-name=ld" "" "none" ""] 0]
158 set ld_output [remote_exec host "$gcc_ld" "--help"]
159 if { [ string first "--gc-sections" $ld_output ] >= 0 } {
160 set gc_sections_available_saved 1
162 set gc_sections_available_saved 0
165 return $gc_sections_available_saved
168 # Return true if profiling is supported on the target.
170 proc check_profiling_available { test_what } {
171 global profiling_available_saved
173 verbose "Profiling argument is <$test_what>" 1
175 # These conditions depend on the argument so examine them before
176 # looking at the cache variable.
178 # Support for -p on solaris2 relies on mcrt1.o which comes with the
179 # vendor compiler. We cannot reliably predict the directory where the
180 # vendor compiler (and thus mcrt1.o) is installed so we can't
181 # necessarily find mcrt1.o even if we have it.
182 if { [istarget *-*-solaris2*] && [lindex $test_what 1] == "-p" } {
186 # Support for -p on irix relies on libprof1.a which doesn't appear to
187 # exist on any irix6 system currently posting testsuite results.
188 # Support for -pg on irix relies on gcrt1.o which doesn't exist yet.
189 # See: http://gcc.gnu.org/ml/gcc/2002-10/msg00169.html
190 if { [istarget mips*-*-irix*]
191 && ([lindex $test_what 1] == "-p" || [lindex $test_what 1] == "-pg") } {
195 # Now examine the cache variable.
196 if {![info exists profiling_available_saved]} {
197 # Some targets don't have any implementation of __bb_init_func or are
198 # missing other needed machinery.
199 if { [istarget mmix-*-*]
200 || [istarget arm*-*-elf]
201 || [istarget strongarm*-*-elf]
202 || [istarget xscale*-*-elf]
203 || [istarget cris-*-*]
204 || [istarget h8300-*-*]
205 || [istarget *-*-windiss] } {
206 set profiling_available_saved 0
208 set profiling_available_saved 1
212 return $profiling_available_saved
215 # Return true if iconv is supported on the target. In particular IBM-1047.
217 proc check_iconv_available { test_what } {
223 verbose "check_iconv_available compiling testfile" 1
224 set f [open "tmp.c" "w"]
225 # Compile a small test program.
226 puts $f "#include <iconv.h>\n"
227 puts $f "int main (void)\n {\n iconv_t cd; \n"
228 puts $f "cd = iconv_open (\"[lindex $test_what 1]\", \"UTF-8\");\n"
229 puts $f "if (cd == (iconv_t) -1)\n return 1;\n"
230 puts $f "return 0;\n}"
233 set lines [${tool}_target_compile "tmp.c" "tmp.x" executable "libs=$libiconv" ]
235 if [string match "" $lines] then {
236 # No error messages, everything is OK.
238 set result [${tool}_load "./tmp.x" "" ""]
239 set status [lindex $result 0];
241 verbose "status is <$status>"
243 if { $status == "pass" } then {
251 # Return true if named sections are supported on this target.
252 # This proc does not cache results, because the answer may vary
253 # when cycling over subtarget options (e.g. irix o32/n32/n64) in
255 proc check_named_sections_available { } {
258 set f [open "tmp.c" "w"]
259 # Compile a small test program.
260 puts $f "int __attribute__ ((section(\"whatever\"))) foo;"
262 set lines [${tool}_target_compile "tmp.c" "tmp.o" object ""]
265 # If we got no error messages, everything is OK.
266 set answer [string match "" $lines]
267 verbose "check_named_sections_available returning $answer" 2