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)
14 AC_INIT([GNU C Runtime Library], 1.0,,[libgcc])
15 AC_CONFIG_SRCDIR([static-object.mk])
17 # The libgcc should not depend on any header files
18 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
19 [m4_divert_text([DEFAULTS],
20 [ac_includes_default='/* none */'])])
22 AC_ARG_WITH(target-subdir,
23 [ --with-target-subdir=SUBDIR Configuring in a subdirectory for target])
24 AC_ARG_WITH(cross-host,
25 [ --with-cross-host=HOST Configuring with a cross compiler])
27 [ --with-ld arrange to use the specified ld (full pathname)])
29 if test "${srcdir}" = "."; then
30 if test -n "${with_build_subdir}"; then
31 libgcc_topdir="${srcdir}/../.."
33 elif test -z "${with_target_subdir}"; then
34 libgcc_topdir="${srcdir}/.."
36 if test "${with_target_subdir}" != "."; then
37 libgcc_topdir="${srcdir}/${with_multisrctop}../.."
39 libgcc_topdir="${srcdir}/${with_multisrctop}.."
43 libgcc_topdir="${srcdir}/.."
45 AC_SUBST(libgcc_topdir)
46 AC_CONFIG_AUX_DIR($libgcc_topdir)
47 AC_CONFIG_HEADER(auto-target.h:config.in)
50 [ --disable-shared don't provide a shared libgcc],
52 case $enable_shared in
56 IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
57 for pkg in $enableval; do
58 if test "X$pkg" = "Xgcc" || test "X$pkg" = "Xlibgcc"; then
65 ], [enable_shared=yes])
66 AC_SUBST(enable_shared)
71 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
72 AC_ARG_ENABLE(version-specific-runtime-libs,
73 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
75 yes) version_specific_libs=yes ;;
76 no) version_specific_libs=no ;;
77 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
79 [version_specific_libs=no])
80 AC_MSG_RESULT($version_specific_libs)
83 [ --with-slibdir=DIR shared libraries in DIR [LIBDIR]],
84 slibdir="$with_slibdir",
85 if test "${version_specific_libs}" = yes; then
86 slibdir='$(libsubdir)'
87 elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then
88 slibdir='$(exec_prefix)/$(host_noncanonical)/lib'
94 # Command-line options.
95 # Very limited version of AC_MAINTAINER_MODE.
96 AC_ARG_ENABLE([maintainer-mode],
97 [AC_HELP_STRING([--enable-maintainer-mode],
98 [enable make rules and dependencies not useful (and
99 sometimes confusing) to the casual installer])],
100 [case ${enable_maintainer_mode} in
103 *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
105 maintainer_mode=${enableval}],
112 # We need awk; bail out if it's missing.
114 "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
118 ACX_NONCANONICAL_HOST
119 ACX_NONCANONICAL_TARGET
122 # Calculate toolexeclibdir
123 # Also toolexecdir, though it's only used in toolexeclibdir
124 case ${version_specific_libs} in
126 # Need the gcc compiler version to know where to install libraries
127 # and header files if --enable-version-specific-runtime-libs option
129 toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
130 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
133 if test -n "$with_cross_host" &&
134 test x"$with_cross_host" != x"no"; then
135 # Install a library built with a cross compiler in tooldir, not libdir.
136 toolexecdir='$(exec_prefix)/$(target_noncanonical)'
137 toolexeclibdir='$(toolexecdir)/lib'
139 toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
140 toolexeclibdir='$(libdir)'
142 multi_os_directory=`$CC -print-multi-os-directory`
143 case $multi_os_directory in
144 .) ;; # Avoid trailing /.
145 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
149 AC_SUBST(toolexecdir)
150 AC_SUBST(toolexeclibdir)
152 dnl These must be called before AM_PROG_LIBTOOL, because it may want
153 dnl to call AC_CHECK_PROG.
154 AC_CHECK_TOOL(AR, ar)
155 AC_CHECK_TOOL(LIPO, lipo, :)
156 AC_CHECK_TOOL(NM, nm)
157 AC_CHECK_TOOL(RANLIB, ranlib, :)
158 AC_CHECK_TOOL(STRIP, strip, :)
165 AC_CHECK_SIZEOF([double])
166 AC_CHECK_SIZEOF([long double])
167 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
168 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
169 AC_SUBST(double_type_size)
170 AC_SUBST(long_double_type_size)
172 # Check for decimal float support.
173 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
174 [AC_COMPILE_IFELSE([_Decimal32 x;], [libgcc_cv_dfp=yes],
175 [libgcc_cv_dfp=no])])
176 decimal_float=$libgcc_cv_dfp
177 AC_SUBST(decimal_float)
179 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
181 # Check for fixed-point support.
182 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
183 [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
184 [libgcc_cv_fixed_point=no])])
185 fixed_point=$libgcc_cv_fixed_point
186 AC_SUBST(fixed_point)
188 # For platforms with the unwind ABI which includes an unwind library,
189 # libunwind, we can choose to use the system libunwind.
190 # config.gcc also contains tests of with_system_libunwind.
191 GCC_CHECK_UNWIND_GETIPINFO
193 # The sjlj test is almost duplicated here and in libgo/configure.ac (for C),
194 # libstdc++-v3/acinclude.m4 and libjava/configure.ac (for C++), and
195 # libobjc/configure.ac (for Objective-C).
196 # FIXME: This should be centralized in config/sjlj.m4.
197 AC_ARG_ENABLE(sjlj-exceptions,
198 AC_HELP_STRING([--enable-sjlj-exceptions],
199 [force use of builtin_setjmp for exceptions]),
200 [case "$enableval" in
202 *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
204 [enable_sjlj_exceptions=auto])
206 AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
207 [libgcc_cv_lib_sjlj_exceptions],
214 int i __attribute__ ((cleanup (clean)));
219 CFLAGS="--save-temps -fexceptions"
220 libgcc_cv_lib_sjlj_exceptions=unknown
221 AS_IF([ac_fn_c_try_compile],
222 [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
223 libgcc_cv_lib_sjlj_exceptions=yes
224 elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
225 libgcc_cv_lib_sjlj_exceptions=no
231 if test "$enable_sjlj_exceptions" = "auto"; then
232 enable_sjlj_exceptions=$libgcc_cv_lib_sjlj_exceptions
235 case $enable_sjlj_exceptions in
237 AC_DEFINE(LIBGCC_SJLJ_EXCEPTIONS, 1,
238 [Define if the C compiler is configured for setjmp/longjmp exceptions.])
243 AC_MSG_ERROR([unable to detect exception model])
249 AC_MSG_CHECKING([for thread model used by GCC])
250 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
251 AC_MSG_RESULT([$target_thread_file])
253 # Check for assembler CFI support.
254 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
259 .cfi_personality 0, symbol\n\
262 [libgcc_cv_cfi=no])])
264 # Check 32bit or 64bit
265 cat > conftest.c <<EOF
266 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__))
272 eval `${CC-cc} -E conftest.c | grep host_address=`
275 # Collect host-machine-specific information.
276 . ${srcdir}/config.host
278 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
279 # This is after config.host so we can augment tmake_file.
280 # Link with -nostartfiles -nodefaultlibs since neither are present while
283 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
284 cat > conftest.s <<EOF
285 .section .eh_frame,"a",@unwind
287 .section .jcr,"aw",@progbits
290 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
291 tmake_file="${tmake_file} i386/t-crtstuff"
296 # Check for visibility support. This is after config.host so that
297 # we can check for asm_hidden_op.
298 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
299 libgcc_cv_hidden_visibility_attribute, [
300 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
301 libgcc_cv_hidden_visibility_attribute=no
302 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
303 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
304 libgcc_cv_hidden_visibility_attribute=yes
310 if test $libgcc_cv_hidden_visibility_attribute = yes; then
311 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
317 # See if we have thread-local storage. We can only test assembler
318 # since link-time and run-time tests require the newly built
319 # gcc, which can't be used to build executable due to that libgcc
320 # is yet to be built here.
323 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
324 set_have_cc_tls="-DHAVE_CC_TLS"
326 AC_SUBST(set_have_cc_tls)
328 # See if we have emulated thread-local storage.
331 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
332 set_use_emutls="-DUSE_EMUTLS"
334 AC_SUBST(set_use_emutls)
336 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
337 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
338 [[void ip (void) __attribute__ ((constructor (1)));]])],
339 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
340 if test $libgcc_cv_init_priority = yes; then
341 AC_DEFINE(HAVE_INIT_PRIORITY, 1,
342 [Define if the compiler supports init priority.])
345 # Conditionalize the sfp-machine.h header for this target machine.
346 if test -z "${sfp_machine_header}"; then
347 sfp_machine_header=$cpu_type/sfp-machine.h
348 if test -f ${srcdir}/config/${sfp_machine_header}; then
351 sfp_machine_header=no-sfp-machine.h
354 AC_SUBST(sfp_machine_header)
356 # Conditionalize the makefile for this target machine.
358 for f in ${tmake_file}
360 if test -f ${srcdir}/config/$f
362 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
365 tmake_file="${tmake_file_}"
368 # Likewise export definitions for libgcc_tm.h
372 tm_file_="${tm_file_} \$(srcdir)/config/$f"
374 tm_file="${tm_file_}"
378 # Map from thread model to thread header.
379 case $target_thread_file in
380 aix) thread_header=config/rs6000/gthr-aix.h ;;
381 dce) thread_header=config/pa/gthr-dce.h ;;
382 lynx) thread_header=config/gthr-lynx.h ;;
383 mipssde) thread_header=config/mips/gthr-mipssde.h ;;
384 posix) thread_header=gthr-posix.h ;;
385 rtems) thread_header=config/gthr-rtems.h ;;
386 single) thread_header=gthr-single.h ;;
387 tpf) thread_header=config/s390/gthr-tpf.h ;;
388 vxworks) thread_header=config/gthr-vxworks.h ;;
389 win32) thread_header=config/i386/gthr-win32.h ;;
392 # Substitute configuration variables
394 AC_SUBST(extra_parts)
395 AC_SUBST(asm_hidden_op)
396 AC_CONFIG_LINKS([enable-execute-stack.c:$enable_execute_stack])
397 AC_CONFIG_LINKS([unwind.h:$unwind_header])
398 AC_CONFIG_LINKS([md-unwind-support.h:config/$md_unwind_header])
399 AC_CONFIG_LINKS([sfp-machine.h:config/$sfp_machine_header])
400 AC_CONFIG_LINKS([gthr-default.h:$thread_header])
402 # We need multilib support.
403 AC_CONFIG_FILES([Makefile])
404 AC_CONFIG_COMMANDS([default],
405 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
406 if test -n "$CONFIG_FILES"; then
407 # FIXME: We shouldn't need to set ac_file
409 . ${libgcc_topdir}/config-ml.in
413 with_target_subdir=${with_target_subdir}
414 with_multisubdir=${with_multisubdir}
415 ac_configure_args="--enable-multilib ${ac_configure_args}"
416 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
417 libgcc_topdir=${libgcc_topdir}