re PR testsuite/55994 (multiple definition or memset or strlen for builtins tests...
[official-gcc.git] / libgcc / configure.ac
blob8b7aba5823bda7adb9b347e8d49f51f3913a5515
1 dnl Process this file with autoconf to produce a configure script.
3 sinclude(../config/enable.m4)
4 sinclude(../config/tls.m4)
5 sinclude(../config/acx.m4)
6 sinclude(../config/no-executables.m4)
7 sinclude(../config/lib-ld.m4)
8 sinclude(../config/override.m4)
9 sinclude(../config/picflag.m4)
10 sinclude(../config/dfp.m4)
11 sinclude(../config/unwind_ipinfo.m4)
12 sinclude(../config/gthr.m4)
14 AC_PREREQ(2.64)
15 AC_INIT([GNU C Runtime Library], 1.0,,[libgcc])
16 AC_CONFIG_SRCDIR([static-object.mk])
18 # The libgcc should not depend on any header files
19 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
20   [m4_divert_text([DEFAULTS],
21     [ac_includes_default='/* none */'])])
23 AC_ARG_WITH(target-subdir,
24 [  --with-target-subdir=SUBDIR      Configuring in a subdirectory for target])
25 AC_ARG_WITH(cross-host,
26 [  --with-cross-host=HOST           Configuring with a cross compiler])
27 AC_ARG_WITH(ld,
28 [  --with-ld               arrange to use the specified ld (full pathname)])
30 if test "${srcdir}" = "."; then
31   if test -n "${with_build_subdir}"; then
32     libgcc_topdir="${srcdir}/../.."
33     with_target_subdir=
34   elif test -z "${with_target_subdir}"; then
35     libgcc_topdir="${srcdir}/.."
36   else
37     if test "${with_target_subdir}" != "."; then
38       libgcc_topdir="${srcdir}/${with_multisrctop}../.."
39     else
40       libgcc_topdir="${srcdir}/${with_multisrctop}.."
41     fi
42   fi
43 else
44   libgcc_topdir="${srcdir}/.."
46 AC_SUBST(libgcc_topdir)
47 AC_CONFIG_AUX_DIR($libgcc_topdir)
48 AC_CONFIG_HEADER(auto-target.h:config.in)
50 AC_ARG_ENABLE(shared,
51 [  --disable-shared        don't provide a shared libgcc],
53   case $enable_shared in
54   yes | no) ;;
55   *)
56     enable_shared=no
57     IFS="${IFS=         }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
58     for pkg in $enableval; do
59       if test "X$pkg" = "Xgcc" || test "X$pkg" = "Xlibgcc"; then
60         enable_shared=yes
61       fi
62     done
63     IFS="$ac_save_ifs"
64     ;;
65   esac
66 ], [enable_shared=yes])
67 AC_SUBST(enable_shared)
69 GCC_PICFLAG
70 AC_SUBST(PICFLAG)
72 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
73 AC_ARG_ENABLE(version-specific-runtime-libs,
74 [  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
75 [case "$enableval" in
76  yes) version_specific_libs=yes ;;
77  no)  version_specific_libs=no ;;
78  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
79  esac],
80 [version_specific_libs=no])
81 AC_MSG_RESULT($version_specific_libs)
83 AC_ARG_WITH(slibdir,
84 [  --with-slibdir=DIR      shared libraries in DIR [LIBDIR]],
85 slibdir="$with_slibdir",
86 if test "${version_specific_libs}" = yes; then
87   slibdir='$(libsubdir)'
88 elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then
89   slibdir='$(exec_prefix)/$(host_noncanonical)/lib'
90 else
91   slibdir='$(libdir)'
92 fi)
93 AC_SUBST(slibdir)
95 # Command-line options.
96 # Very limited version of AC_MAINTAINER_MODE.
97 AC_ARG_ENABLE([maintainer-mode],
98   [AC_HELP_STRING([--enable-maintainer-mode],
99                  [enable make rules and dependencies not useful (and
100                   sometimes confusing) to the casual installer])],
101   [case ${enable_maintainer_mode} in
102      yes) MAINT='' ;;
103      no) MAINT='#' ;;
104      *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
105    esac
106    maintainer_mode=${enableval}],
107   [MAINT='#'])
108 AC_SUBST([MAINT])dnl
110 AC_PROG_INSTALL
112 AC_PROG_AWK
113 # We need awk; bail out if it's missing.
114 case ${AWK} in
115   "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
116 esac
118 AC_CANONICAL_HOST
119 ACX_NONCANONICAL_HOST
120 ACX_NONCANONICAL_TARGET
121 GCC_TOPLEV_SUBDIRS
123 # Calculate toolexeclibdir
124 # Also toolexecdir, though it's only used in toolexeclibdir
125 case ${version_specific_libs} in
126   yes)
127     # Need the gcc compiler version to know where to install libraries
128     # and header files if --enable-version-specific-runtime-libs option
129     # is selected.
130     toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
131     toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
132     ;;
133   no)
134     if test -n "$with_cross_host" &&
135        test x"$with_cross_host" != x"no"; then
136       # Install a library built with a cross compiler in tooldir, not libdir.
137       toolexecdir='$(exec_prefix)/$(target_noncanonical)'
138       toolexeclibdir='$(toolexecdir)/lib'
139     else
140       toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
141       toolexeclibdir='$(libdir)'
142     fi
143     multi_os_directory=`$CC -print-multi-os-directory`
144     case $multi_os_directory in
145       .) ;; # Avoid trailing /.
146       *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
147     esac
148     ;;
149 esac
150 AC_SUBST(toolexecdir)
151 AC_SUBST(toolexeclibdir)
153 dnl These must be called before AM_PROG_LIBTOOL, because it may want
154 dnl to call AC_CHECK_PROG.
155 AC_CHECK_TOOL(AR, ar)
156 AC_CHECK_TOOL(LIPO, lipo, :)
157 AC_CHECK_TOOL(NM, nm)
158 AC_CHECK_TOOL(RANLIB, ranlib, :)
159 AC_CHECK_TOOL(STRIP, strip, :)
160 AC_PROG_LN_S
162 GCC_NO_EXECUTABLES
163 AC_PROG_CC
164 AC_PROG_CPP_WERROR
166 AC_CHECK_SIZEOF([double])
167 AC_CHECK_SIZEOF([long double])
168 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
169 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
170 AC_SUBST(double_type_size)
171 AC_SUBST(long_double_type_size)
173 # Check for decimal float support.
174 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
175                [AC_COMPILE_IFELSE([_Decimal32 x;], [libgcc_cv_dfp=yes],
176                                   [libgcc_cv_dfp=no])])
177 decimal_float=$libgcc_cv_dfp
178 AC_SUBST(decimal_float)
180 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
182 # Check for fixed-point support.
183 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
184                [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
185                                   [libgcc_cv_fixed_point=no])])
186 fixed_point=$libgcc_cv_fixed_point
187 AC_SUBST(fixed_point)
189 # For platforms with the unwind ABI which includes an unwind library,
190 # libunwind, we can choose to use the system libunwind.
191 # config.gcc also contains tests of with_system_libunwind.
192 GCC_CHECK_UNWIND_GETIPINFO
194 # The sjlj test is almost duplicated here and in libgo/configure.ac (for C),
195 # libstdc++-v3/acinclude.m4 and libjava/configure.ac (for C++), and
196 # libobjc/configure.ac (for Objective-C).
197 # FIXME: This should be centralized in config/sjlj.m4.
198 AC_ARG_ENABLE(sjlj-exceptions,
199   AC_HELP_STRING([--enable-sjlj-exceptions],
200                  [force use of builtin_setjmp for exceptions]),
201   [case "$enableval" in
202    yes|no|auto) ;;
203    *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
204    esac],
205   [enable_sjlj_exceptions=auto])
207 AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
208 [libgcc_cv_lib_sjlj_exceptions],
209 [AC_LANG_CONFTEST(
210   [AC_LANG_SOURCE([
211 void bar ();
212 void clean (int *);
213 void foo ()
215   int i __attribute__ ((cleanup (clean)));
216   bar();
218 ])])
219 CFLAGS_hold=$CFLAGS
220 CFLAGS="--save-temps -fexceptions"
221 libgcc_cv_lib_sjlj_exceptions=unknown
222 AS_IF([ac_fn_c_try_compile],
223   [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
224     libgcc_cv_lib_sjlj_exceptions=yes
225   elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
226     libgcc_cv_lib_sjlj_exceptions=no
227   fi])
228 CFLAGS=$CFLAGS_hold
229 rm -f conftest*
232 if test "$enable_sjlj_exceptions" = "auto"; then
233   enable_sjlj_exceptions=$libgcc_cv_lib_sjlj_exceptions
236 case $enable_sjlj_exceptions in
237 yes)
238   AC_DEFINE(LIBGCC_SJLJ_EXCEPTIONS, 1,
239         [Define if the C compiler is configured for setjmp/longjmp exceptions.])
240   ;;
242   ;;
244   AC_MSG_ERROR([unable to detect exception model])
245   ;;
246 esac
248 AC_LIB_PROG_LD_GNU
250 AC_MSG_CHECKING([for thread model used by GCC])
251 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
252 AC_MSG_RESULT([$target_thread_file]) 
254 # Check for assembler CFI support.
255 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
256                [AC_COMPILE_IFELSE(
257 [asm("\n\
258         .text\n\
259         .cfi_startproc\n\
260         .cfi_personality 0, symbol\n\
261         .cfi_endproc");],
262   [libgcc_cv_cfi=yes],
263   [libgcc_cv_cfi=no])])
265 # Check 32bit or 64bit
266 cat > conftest.c <<EOF
267 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__))
268 host_address=64
269 #else
270 host_address=32
271 #endif
273 eval `${CC-cc} -E conftest.c | grep host_address=`
274 rm -f conftest.c
276 # Collect host-machine-specific information.
277 . ${srcdir}/config.host
279 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
280 # This is after config.host so we can augment tmake_file.
281 # Link with -nostartfiles -nodefaultlibs since neither are present while
282 # building libgcc.
283 case ${host} in
284 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
285   cat > conftest.s <<EOF
286         .section        .eh_frame,"a",@unwind
287         .zero   4
288         .section        .jcr,"aw",@progbits
289         .zero   8
291   if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
292       tmake_file="${tmake_file} i386/t-crtstuff"
293   fi
294   ;;
295 esac
297 # Check for visibility support.  This is after config.host so that
298 # we can check for asm_hidden_op.
299 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
300     libgcc_cv_hidden_visibility_attribute, [
301         echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
302         libgcc_cv_hidden_visibility_attribute=no
303         if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
304             if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
305                 libgcc_cv_hidden_visibility_attribute=yes
306             fi
307         fi
308         rm -f conftest.*
309     ])
311 if test $libgcc_cv_hidden_visibility_attribute = yes; then
312     vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
313 else
314     vis_hide=
316 AC_SUBST(vis_hide)
318 # See if we have thread-local storage.  We can only test assembler
319 # since link-time and run-time tests require the newly built
320 # gcc, which can't be used to build executable due to that libgcc
321 # is yet to be built here.
322 GCC_CHECK_CC_TLS
323 set_have_cc_tls=
324 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
325   set_have_cc_tls="-DHAVE_CC_TLS"
327 AC_SUBST(set_have_cc_tls)
329 # See if we have emulated thread-local storage.
330 GCC_CHECK_EMUTLS
331 set_use_emutls=
332 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
333   set_use_emutls="-DUSE_EMUTLS"
335 AC_SUBST(set_use_emutls)
337 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
338 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
339   [[void ip (void) __attribute__ ((constructor (1)));]])],
340   [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
341 if test $libgcc_cv_init_priority = yes; then
342   AC_DEFINE(HAVE_INIT_PRIORITY, 1,
343   [Define if the compiler supports init priority.])
346 # Conditionalize the sfp-machine.h header for this target machine.
347 if test -z "${sfp_machine_header}"; then
348         sfp_machine_header=$cpu_type/sfp-machine.h
349         if test -f ${srcdir}/config/${sfp_machine_header}; then
350                 :
351         else
352                 sfp_machine_header=no-sfp-machine.h
353         fi
355 AC_SUBST(sfp_machine_header)
357 # Conditionalize the makefile for this target machine.
358 tmake_file_=
359 for f in ${tmake_file}
361         if test -f ${srcdir}/config/$f
362         then
363                 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
364         fi
365 done
366 tmake_file="${tmake_file_}"
367 AC_SUBST(tmake_file)
369 # Likewise export definitions for libgcc_tm.h
370 tm_file_=
371 for f in ${tm_file}
373         tm_file_="${tm_file_} \$(srcdir)/config/$f"
374 done
375 tm_file="${tm_file_}"
376 AC_SUBST(tm_file)
377 AC_SUBST(tm_defines)
379 # Map from thread model to thread header.
380 GCC_AC_THREAD_HEADER([$target_thread_file])
382 # Substitute configuration variables
383 AC_SUBST(cpu_type)
384 AC_SUBST(extra_parts)
385 AC_SUBST(asm_hidden_op)
386 AC_CONFIG_LINKS([enable-execute-stack.c:$enable_execute_stack])
387 AC_CONFIG_LINKS([unwind.h:$unwind_header])
388 AC_CONFIG_LINKS([md-unwind-support.h:config/$md_unwind_header])
389 AC_CONFIG_LINKS([sfp-machine.h:config/$sfp_machine_header])
390 AC_CONFIG_LINKS([gthr-default.h:$thread_header])
392 # We need multilib support.
393 AC_CONFIG_FILES([Makefile])
394 AC_CONFIG_COMMANDS([default],
395   [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
396 if test -n "$CONFIG_FILES"; then
397   # FIXME: We shouldn't need to set ac_file
398   ac_file=Makefile
399   . ${libgcc_topdir}/config-ml.in
400 fi]],
401 [[srcdir=${srcdir}
402 host=${host}
403 with_target_subdir=${with_target_subdir}
404 with_multisubdir=${with_multisubdir}
405 ac_configure_args="--enable-multilib ${ac_configure_args}"
406 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
407 libgcc_topdir=${libgcc_topdir}
408 CC="${CC}"
410 AC_OUTPUT