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)
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])
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="${srcdir}/../.."
34 elif test -z "${with_target_subdir}"; then
35 libgcc_topdir="${srcdir}/.."
37 if test "${with_target_subdir}" != "."; then
38 libgcc_topdir="${srcdir}/${with_multisrctop}../.."
40 libgcc_topdir="${srcdir}/${with_multisrctop}.."
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)
51 [ --disable-shared don't provide a shared libgcc],
53 case $enable_shared in
57 IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
58 for pkg in $enableval; do
59 if test "X$pkg" = "Xgcc" || test "X$pkg" = "Xlibgcc"; then
66 ], [enable_shared=yes])
67 AC_SUBST(enable_shared)
72 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
73 AC_ARG_ENABLE(version-specific-runtime-libs,
74 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
76 yes) version_specific_libs=yes ;;
77 no) version_specific_libs=no ;;
78 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
80 [version_specific_libs=no])
81 AC_MSG_RESULT($version_specific_libs)
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'
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 ${enable_maintainer_mode} in
104 *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
106 maintainer_mode=${enableval}],
113 # We need awk; bail out if it's missing.
115 "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
119 ACX_NONCANONICAL_HOST
120 ACX_NONCANONICAL_TARGET
123 # Calculate toolexeclibdir
124 # Also toolexecdir, though it's only used in toolexeclibdir
125 case ${version_specific_libs} in
127 # Need the gcc compiler version to know where to install libraries
128 # and header files if --enable-version-specific-runtime-libs option
130 toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
131 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
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='$(toolexecdir)/lib'
140 toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
141 toolexeclibdir='$(libdir)'
143 multi_os_directory=`$CC -print-multi-os-directory`
144 case $multi_os_directory in
145 .) ;; # Avoid trailing /.
146 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
150 AC_SUBST(toolexecdir)
151 AC_SUBST(toolexeclibdir)
153 dnl These must be called before AM_PROG_LIBTOOL, because it may want
154 dnl to call AC_CHECK_PROG.
155 AC_CHECK_TOOL(AR, ar)
156 AC_CHECK_TOOL(LIPO, lipo, :)
157 AC_CHECK_TOOL(NM, nm)
158 AC_CHECK_TOOL(RANLIB, ranlib, :)
159 AC_CHECK_TOOL(STRIP, strip, :)
166 AC_CHECK_SIZEOF([double])
167 AC_CHECK_SIZEOF([long double])
168 AS_VAR_ARITH([double_type_size], [$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 "$enableval" in
203 *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
205 [enable_sjlj_exceptions=auto])
207 AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
208 [libgcc_cv_lib_sjlj_exceptions],
215 int i __attribute__ ((cleanup (clean)));
220 CFLAGS="--save-temps -fexceptions"
221 libgcc_cv_lib_sjlj_exceptions=unknown
222 AS_IF([ac_fn_c_try_compile],
223 [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
224 libgcc_cv_lib_sjlj_exceptions=yes
225 elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
226 libgcc_cv_lib_sjlj_exceptions=no
232 if test "$enable_sjlj_exceptions" = "auto"; then
233 enable_sjlj_exceptions=$libgcc_cv_lib_sjlj_exceptions
236 case $enable_sjlj_exceptions in
238 AC_DEFINE(LIBGCC_SJLJ_EXCEPTIONS, 1,
239 [Define if the C compiler is configured for setjmp/longjmp exceptions.])
244 AC_MSG_ERROR([unable to detect exception model])
250 AC_MSG_CHECKING([for thread model used by GCC])
251 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
252 AC_MSG_RESULT([$target_thread_file])
254 # Check for assembler CFI support.
255 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
260 .cfi_personality 0, symbol\n\
263 [libgcc_cv_cfi=no])])
265 # Check 32bit or 64bit
266 cat > conftest.c <<EOF
267 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__))
273 eval `${CC-cc} -E conftest.c | grep host_address=`
276 # Collect host-machine-specific information.
277 . ${srcdir}/config.host
279 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
280 # This is after config.host so we can augment tmake_file.
281 # Link with -nostartfiles -nodefaultlibs since neither are present while
284 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
285 cat > conftest.s <<EOF
286 .section .eh_frame,"a",@unwind
288 .section .jcr,"aw",@progbits
291 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
292 tmake_file="${tmake_file} i386/t-crtstuff"
297 # Check for visibility support. This is after config.host so that
298 # we can check for asm_hidden_op.
299 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
300 libgcc_cv_hidden_visibility_attribute, [
301 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
302 libgcc_cv_hidden_visibility_attribute=no
303 if AC_TRY_COMMAND(${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
311 if test $libgcc_cv_hidden_visibility_attribute = yes; then
312 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
318 # See if we have thread-local storage. We can only test assembler
319 # since link-time and run-time tests require the newly built
320 # gcc, which can't be used to build executable due to that libgcc
321 # is yet to be built here.
324 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
325 set_have_cc_tls="-DHAVE_CC_TLS"
327 AC_SUBST(set_have_cc_tls)
329 # See if we have emulated thread-local storage.
332 if test "$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
352 sfp_machine_header=no-sfp-machine.h
355 AC_SUBST(sfp_machine_header)
357 # Conditionalize the makefile for this target machine.
359 for f in ${tmake_file}
361 if test -f ${srcdir}/config/$f
363 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
366 tmake_file="${tmake_file_}"
369 # Likewise export definitions for libgcc_tm.h
373 tm_file_="${tm_file_} \$(srcdir)/config/$f"
375 tm_file="${tm_file_}"
379 # Map from thread model to thread header.
380 GCC_AC_THREAD_HEADER([$target_thread_file])
382 # Substitute configuration variables
384 AC_SUBST(extra_parts)
385 AC_SUBST(asm_hidden_op)
386 AC_CONFIG_LINKS([enable-execute-stack.c:$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
399 . ${libgcc_topdir}/config-ml.in
403 with_target_subdir=${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}