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 ###############################
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 # Windows targets Cygwin and MingW32 support it
53 if { [regexp ".*mingw32|.*cygwin" $target_triplet] } {
57 # ELF and ECOFF support it. a.out does with gas/gld but may also with
58 # other linkers, so we should try it
60 set objformat [gcc_target_object_format]
72 ###############################
73 # proc check_visibility_available { }
74 ###############################
76 # The visibility attribute is only support in some object formats
77 # This proc returns 1 if it is supported, 0 if not, -1 if unsure.
79 proc check_visibility_available { } {
83 # On NetWare, support makes no sense.
85 if { [string match "*-*-netware*" $target_triplet] } {
89 # ELF supports it if the system has recent GNU ld and gas.
90 # As a start we return 1 for all ELF systems; we'll let people
91 # add exceptions as necessary.
93 set objformat [gcc_target_object_format]
103 ###############################
104 # proc check_alias_available { }
105 ###############################
107 # Determine if the target toolchain supports the alias attribute.
109 # Returns 2 if the target supports aliases. Returns 1 if the target
110 # only supports weak aliased. Returns 0 if the target does not
111 # support aliases at all. Returns -1 if support for aliases could not
114 proc check_alias_available { } {
115 global alias_available_saved
118 if [info exists alias_available_saved] {
119 verbose "check_alias_available returning saved $alias_available_saved" 2
123 verbose "check_alias_available compiling testfile $src" 2
124 set f [open $src "w"]
125 # Compile a small test program. The definition of "g" is
126 # necessary to keep the Solaris assembler from complaining
128 puts $f "#ifdef __cplusplus\nextern \"C\"\n#endif\n"
129 puts $f "void g() {} void f() __attribute__((alias(\"g\")));"
131 set lines [${tool}_target_compile $src $obj object ""]
133 remote_file build delete $obj
135 if [string match "" $lines] then {
136 # No error messages, everything is OK.
137 set alias_available_saved 2
139 if [regexp "alias definitions not supported" $lines] {
140 verbose "check_alias_available target does not support aliases" 2
142 set objformat [gcc_target_object_format]
144 if { $objformat == "elf" } {
145 verbose "check_alias_available but target uses ELF format, so it ought to" 2
146 set alias_available_saved -1
148 set alias_available_saved 0
151 if [regexp "only weak aliases are supported" $lines] {
152 verbose "check_alias_available target supports only weak aliases" 2
153 set alias_available_saved 1
155 set alias_available_saved -1
160 verbose "check_alias_available returning $alias_available_saved" 2
163 return $alias_available_saved
166 # Returns true if --gc-sections is supported on the target.
168 proc check_gc_sections_available { } {
169 global gc_sections_available_saved
172 if {![info exists gc_sections_available_saved]} {
173 # Check if the ld used by gcc supports --gc-sections.
174 set gcc_spec [${tool}_target_compile "-dumpspecs" "" "none" ""]
175 regsub ".*\n\*linker:\[ \t\]*\n(\[^ \t\n\]*).*" "$gcc_spec" {\1} linker
176 set gcc_ld [lindex [${tool}_target_compile "-print-prog-name=$linker" "" "none" ""] 0]
177 set ld_output [remote_exec host "$gcc_ld" "--help"]
178 if { [ string first "--gc-sections" $ld_output ] >= 0 } {
179 set gc_sections_available_saved 1
181 set gc_sections_available_saved 0
184 return $gc_sections_available_saved
187 # Return true if profiling is supported on the target.
189 proc check_profiling_available { test_what } {
190 global profiling_available_saved
192 verbose "Profiling argument is <$test_what>" 1
194 # These conditions depend on the argument so examine them before
195 # looking at the cache variable.
197 # Support for -p on solaris2 relies on mcrt1.o which comes with the
198 # vendor compiler. We cannot reliably predict the directory where the
199 # vendor compiler (and thus mcrt1.o) is installed so we can't
200 # necessarily find mcrt1.o even if we have it.
201 if { [istarget *-*-solaris2*] && [lindex $test_what 1] == "-p" } {
205 # Support for -p on irix relies on libprof1.a which doesn't appear to
206 # exist on any irix6 system currently posting testsuite results.
207 # Support for -pg on irix relies on gcrt1.o which doesn't exist yet.
208 # See: http://gcc.gnu.org/ml/gcc/2002-10/msg00169.html
209 if { [istarget mips*-*-irix*]
210 && ([lindex $test_what 1] == "-p" || [lindex $test_what 1] == "-pg") } {
214 # Now examine the cache variable.
215 if {![info exists profiling_available_saved]} {
216 # Some targets don't have any implementation of __bb_init_func or are
217 # missing other needed machinery.
218 if { [istarget mmix-*-*]
219 || [istarget arm*-*-eabi*]
220 || [istarget arm*-*-elf]
221 || [istarget arm*-*-symbianelf*]
222 || [istarget powerpc-*-eabi*]
223 || [istarget strongarm*-*-elf]
224 || [istarget xscale*-*-elf]
225 || [istarget cris-*-*]
226 || [istarget h8300-*-*]
227 || [istarget mips*-*-elf]
228 || [istarget *-*-windiss] } {
229 set profiling_available_saved 0
231 set profiling_available_saved 1
235 return $profiling_available_saved
238 # Return true if iconv is supported on the target. In particular IBM-1047.
240 proc check_iconv_available { test_what } {
248 verbose "check_iconv_available compiling testfile $src" 2
249 set f [open $src "w"]
250 # Compile a small test program.
251 puts $f "#include <iconv.h>\n"
252 puts $f "int main (void)\n {\n iconv_t cd; \n"
253 puts $f "cd = iconv_open (\"[lindex $test_what 1]\", \"UTF-8\");\n"
254 puts $f "if (cd == (iconv_t) -1)\n return 1;\n"
255 puts $f "return 0;\n}"
258 set lines [${tool}_target_compile $src $exe executable "libs=$libiconv" ]
261 if [string match "" $lines] then {
262 # No error messages, everything is OK.
264 set result [${tool}_load "./$exe" "" ""]
265 set status [lindex $result 0];
266 remote_file build delete $exe
268 verbose "check_iconv_available status is <$status>" 2
270 if { $status == "pass" } then {
278 # Return true if named sections are supported on this target.
279 # This proc does not cache results, because the answer may vary
280 # when cycling over subtarget options (e.g. irix o32/n32/n64) in
282 proc check_named_sections_available { } {
287 verbose "check_named_sections_available compiling testfile $src" 2
288 set f [open $src "w"]
289 # Compile a small test program.
290 puts $f "int __attribute__ ((section(\"whatever\"))) foo;"
292 set lines [${tool}_target_compile $src $obj object ""]
294 remote_file build delete $obj
296 # If we got no error messages, everything is OK.
297 set answer [string match "" $lines]
298 verbose "check_named_sections_available returning $answer" 2
302 # Return 1 if the target supports executing AltiVec instructions, 0
303 # otherwise. Cache the result.
305 proc check_vmx_hw_available { } {
306 global vmx_hw_available_saved
309 if [info exists vmx_hw_available_saved] {
310 verbose "check_hw_available returning saved $vmx_hw_available_saved" 2
312 set vmx_hw_available_saved 0
314 # Some simulators are known to not support VMX instructions.
315 if { [istarget powerpc-*-eabi] || [istarget powerpc*-*-eabispe] } {
316 verbose "check_hw_available returning 0" 2
317 return $vmx_hw_available_saved
320 # Set up, compile, and execute a test program containing VMX
321 # instructions. Include the current process ID in the file
322 # names to prevent conflicts with invocations for multiple
327 set f [open $src "w"]
328 puts $f "int main() {"
329 puts $f "#ifdef __MACH__"
330 puts $f " asm volatile (\"vor v0,v0,v0\");"
332 puts $f " asm volatile (\"vor 0,0,0\");"
334 puts $f " return 0; }"
337 verbose "check_vmx_hw_available compiling testfile $src" 2
338 set lines [${tool}_target_compile $src $exe executable ""]
341 if [string match "" $lines] then {
342 # No error message, compilation succeeded.
343 set result [${tool}_load "./$exe" "" ""]
344 set status [lindex $result 0]
345 remote_file build delete $exe
346 verbose "check_vmx_hw_available testfile status is <$status>" 2
348 if { $status == "pass" } then {
349 set vmx_hw_available_saved 1
352 verbose "check_vmx_hw_availalble testfile compilation failed" 2
356 return $vmx_hw_available_saved