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$pkg" = "Xlibgcc"; then
66 ], [enable_shared=yes])
67 AC_SUBST(enable_shared)
69 AC_ARG_ENABLE(vtable-verify,
70 [ --enable-vtable-verify Enable vtable verification feature ],
72 yes) enable_vtable_verify=yes ;;
73 no) enable_vtable_verify=no ;;
74 *) enable_vtable_verify=no;;
76 [enable_vtable_verify=no])
77 AC_SUBST(enable_vtable_verify)
79 AC_ARG_WITH(aix-soname,
80 [AS_HELP_STRING([--with-aix-soname=aix|svr4|both],
81 [shared library versioning (aka "SONAME") variant to provide on AIX])],
82 [case "${host}:${enable_shared}" in
83 power*-*-aix[[5-9]]*:yes)
84 AC_MSG_CHECKING([which variant of shared library versioning to provide for shared libgcc])
87 *) AC_MSG_ERROR([Unknown argument to --with-aix-soname]);;
89 AC_MSG_RESULT($withval)
91 *) with_aix_soname=aix ;;
93 ], [with_aix_soname=aix])
94 AC_SUBST(with_aix_soname)
99 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
100 AC_ARG_ENABLE(version-specific-runtime-libs,
101 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
102 [case "$enableval" in
103 yes) version_specific_libs=yes ;;
104 no) version_specific_libs=no ;;
105 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
107 [version_specific_libs=no])
108 AC_MSG_RESULT($version_specific_libs)
111 [ --with-slibdir=DIR shared libraries in DIR [LIBDIR]],
112 slibdir="$with_slibdir",
113 if test "${version_specific_libs}" = yes; then
114 slibdir='$(libsubdir)'
115 elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then
116 slibdir='$(exec_prefix)/$(host_noncanonical)/lib'
122 # Command-line options.
123 # Very limited version of AC_MAINTAINER_MODE.
124 AC_ARG_ENABLE([maintainer-mode],
125 [AC_HELP_STRING([--enable-maintainer-mode],
126 [enable make rules and dependencies not useful (and
127 sometimes confusing) to the casual installer])],
128 [case ${enable_maintainer_mode} in
131 *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
133 maintainer_mode=${enableval}],
140 # We need awk; bail out if it's missing.
142 "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
146 ACX_NONCANONICAL_HOST
147 ACX_NONCANONICAL_TARGET
150 # Calculate toolexeclibdir
151 # Also toolexecdir, though it's only used in toolexeclibdir
152 case ${version_specific_libs} in
154 # Need the gcc compiler version to know where to install libraries
155 # and header files if --enable-version-specific-runtime-libs option
157 toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
158 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
161 if test -n "$with_cross_host" &&
162 test x"$with_cross_host" != x"no"; then
163 # Install a library built with a cross compiler in tooldir, not libdir.
164 toolexecdir='$(exec_prefix)/$(target_noncanonical)'
165 toolexeclibdir='$(toolexecdir)/lib'
167 toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
168 toolexeclibdir='$(libdir)'
170 multi_os_directory=`$CC -print-multi-os-directory`
171 case $multi_os_directory in
172 .) ;; # Avoid trailing /.
173 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
177 AC_SUBST(toolexecdir)
178 AC_SUBST(toolexeclibdir)
180 dnl These must be called before AM_PROG_LIBTOOL, because it may want
181 dnl to call AC_CHECK_PROG.
182 AC_CHECK_TOOL(AR, ar)
183 AC_CHECK_TOOL(LIPO, lipo, :)
184 AC_CHECK_TOOL(NM, nm)
185 AC_CHECK_TOOL(RANLIB, ranlib, :)
186 AC_CHECK_TOOL(STRIP, strip, :)
193 AC_CHECK_SIZEOF([double])
194 AC_CHECK_SIZEOF([long double])
195 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
196 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
197 AC_SUBST(double_type_size)
198 AC_SUBST(long_double_type_size)
200 AC_CHECK_HEADERS(inttypes.h stdint.h stdlib.h ftw.h \
201 unistd.h sys/stat.h sys/types.h \
202 string.h strings.h memory.h)
205 # Check for decimal float support.
206 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
207 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
212 FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT;
215 [libgcc_cv_dfp=no])])
216 decimal_float=$libgcc_cv_dfp
217 AC_SUBST(decimal_float)
219 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
221 # Check for fixed-point support.
222 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
223 [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
224 [libgcc_cv_fixed_point=no])])
225 fixed_point=$libgcc_cv_fixed_point
226 AC_SUBST(fixed_point)
228 # For platforms with the unwind ABI which includes an unwind library,
229 # libunwind, we can choose to use the system libunwind.
230 # config.gcc also contains tests of with_system_libunwind.
231 GCC_CHECK_UNWIND_GETIPINFO
233 # The sjlj test is almost duplicated here and in libgo/configure.ac (for C),
234 # libstdc++-v3/acinclude.m4 and libjava/configure.ac (for C++), and
235 # libobjc/configure.ac (for Objective-C).
236 # FIXME: This should be centralized in config/sjlj.m4.
237 AC_ARG_ENABLE(sjlj-exceptions,
238 AC_HELP_STRING([--enable-sjlj-exceptions],
239 [force use of builtin_setjmp for exceptions]),
240 [case "$enableval" in
242 *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
244 [enable_sjlj_exceptions=auto])
246 AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
247 [libgcc_cv_lib_sjlj_exceptions],
254 int i __attribute__ ((cleanup (clean)));
259 CFLAGS="--save-temps -fexceptions"
260 libgcc_cv_lib_sjlj_exceptions=unknown
261 AS_IF([ac_fn_c_try_compile],
262 [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
263 libgcc_cv_lib_sjlj_exceptions=yes
264 elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
265 libgcc_cv_lib_sjlj_exceptions=no
271 if test "$enable_sjlj_exceptions" = "auto"; then
272 enable_sjlj_exceptions=$libgcc_cv_lib_sjlj_exceptions
275 case $enable_sjlj_exceptions in
277 AC_DEFINE(LIBGCC_SJLJ_EXCEPTIONS, 1,
278 [Define if the C compiler is configured for setjmp/longjmp exceptions.])
283 AC_MSG_ERROR([unable to detect exception model])
287 AC_ARG_ENABLE([explicit-exception-frame-registration],
288 [AC_HELP_STRING([--enable-explicit-exception-frame-registration],
289 [register exception tables explicitly at module start, for use
290 e.g. for compatibility with installations without PT_GNU_EH_FRAME support])],
292 force_explicit_eh_registry=
293 if test "$enable_explicit_exception_frame_registration" = yes; then
294 if test "$enable_sjlj_exceptions" = yes; then
295 AC_MSG_ERROR([Can't enable both of --enable-sjlj-exceptions
296 and --enable-explicit-exception-frame-registration])
298 force_explicit_eh_registry=-DUSE_EH_FRAME_REGISTRY_ALWAYS
301 AC_SUBST([force_explicit_eh_registry])
305 AC_MSG_CHECKING([for thread model used by GCC])
306 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
307 AC_MSG_RESULT([$target_thread_file])
309 # Check for assembler CFI support.
310 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
315 .cfi_personality 0, symbol\n\
318 [libgcc_cv_cfi=no])])
320 # Check 32bit or 64bit. In the case of MIPS, this really determines the
321 # word size rather than the address size.
322 cat > conftest.c <<EOF
323 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \
330 eval `${CC-cc} -E conftest.c | grep host_address=`
335 AC_CACHE_CHECK([whether the target is hard-float],
336 [libgcc_cv_mips_hard_float],
338 [#ifndef __mips_hard_float
341 [libgcc_cv_mips_hard_float=yes],
342 [libgcc_cv_mips_hard_float=no])])
345 # Determine the version of glibc, if any, used on the target.
346 AC_MSG_CHECKING([for target glibc version])
347 AC_ARG_WITH([glibc-version],
348 [AS_HELP_STRING([--with-glibc-version=M.N],
349 [assume GCC used with glibc version M.N or later])], [
350 if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then
351 glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'`
352 glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'`
354 AC_MSG_ERROR([option --with-glibc-version requires a version number M.N])
356 AC_COMPUTE_INT([glibc_version_major], [__GLIBC__],
357 [#include <features.h>],
358 [glibc_version_major=0])
359 AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__],
360 [#include <features.h>],
361 [glibc_version_minor=0])])
362 AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor])
364 # Determine floating-point type for powerpc*-*-linux*.
365 # Single-precision-only FPRs are not a supported configuration for
366 # this target, so are not allowed for in this test.
369 cat > conftest.c <<EOF
372 #elif defined _SOFT_FLOAT
374 #elif defined _SOFT_DOUBLE
376 #elif defined __NO_FPRS__
382 eval `${CC-cc} -E conftest.c | grep ppc_fp_type=`
384 # glibc 2.19 and later provide all the soft-fp functions, with proper
385 # interactions with <fenv.h> exception and rounding mode handling, so
386 # make libgcc's versions into compat symbols if a recent enough glibc
387 # version is being used.
389 case ${ppc_fp_type} in
391 if test $glibc_version_major -gt 2 \
392 || ( test $glibc_version_major -eq 2 \
393 && test $glibc_version_minor -ge 19 ); then
394 ppc_fp_compat="t-softfp-compat"
401 # Collect host-machine-specific information.
402 . ${srcdir}/config.host
404 # Used for constructing correct paths for offload compilers.
406 real_host_noncanonical=${host_noncanonical}
407 if test x"$enable_as_accelerator_for" != x; then
408 accel_dir_suffix=/accel/${target_noncanonical}
409 real_host_noncanonical=${enable_as_accelerator_for}
411 AC_SUBST(accel_dir_suffix)
412 AC_SUBST(real_host_noncanonical)
414 if test x"$enable_offload_targets" != x; then
415 extra_parts="${extra_parts} crtoffloadbegin.o crtoffloadend.o"
418 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
419 # This is after config.host so we can augment tmake_file.
420 # Link with -nostartfiles -nodefaultlibs since neither are present while
423 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
424 cat > conftest.s <<EOF
425 .section .eh_frame,"a",@unwind
427 .section .jcr,"aw",@progbits
430 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
431 tmake_file="${tmake_file} i386/t-crtstuff"
436 # Check if xtensa target is configured for windowed ABI and thus needs to use
437 # custom unwind code.
438 # This is after config.host so we can augment tmake_file.
441 cat > conftest.c <<EOF
442 #ifdef __XTENSA_CALL0_ABI__
446 if AC_TRY_COMMAND(${CC-cc} -E -o conftest.i conftest.c 1>&AS_MESSAGE_LOG_FD); then
447 tmake_file="${tmake_file} xtensa/t-windowed"
452 # Check for visibility support. This is after config.host so that
453 # we can check for asm_hidden_op.
454 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
455 libgcc_cv_hidden_visibility_attribute, [
456 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
457 libgcc_cv_hidden_visibility_attribute=no
458 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
459 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
460 libgcc_cv_hidden_visibility_attribute=yes
466 if test $libgcc_cv_hidden_visibility_attribute = yes; then
467 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
473 # See if we have thread-local storage. We can only test assembler
474 # since link-time and run-time tests require the newly built
475 # gcc, which can't be used to build executable due to that libgcc
476 # is yet to be built here.
479 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
480 set_have_cc_tls="-DHAVE_CC_TLS"
482 AC_SUBST(set_have_cc_tls)
484 # See if we have emulated thread-local storage.
487 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
488 set_use_emutls="-DUSE_EMUTLS"
490 AC_SUBST(set_use_emutls)
492 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
493 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
494 [[void ip (void) __attribute__ ((constructor (1)));]])],
495 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
496 if test $libgcc_cv_init_priority = yes; then
497 AC_DEFINE(HAVE_INIT_PRIORITY, 1,
498 [Define if the compiler supports init priority.])
501 # Conditionalize the sfp-machine.h header for this target machine.
502 if test -z "${sfp_machine_header}"; then
503 sfp_machine_header=$cpu_type/sfp-machine.h
504 if test -f ${srcdir}/config/${sfp_machine_header}; then
507 sfp_machine_header=no-sfp-machine.h
510 AC_SUBST(sfp_machine_header)
512 # Conditionalize the makefile for this target machine.
514 for f in ${tmake_file}
516 if test -f ${srcdir}/config/$f
518 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
521 tmake_file="${tmake_file_}"
524 # Likewise export definitions for libgcc_tm.h
528 tm_file_="${tm_file_} \$(srcdir)/config/$f"
530 tm_file="${tm_file_}"
534 # Map from thread model to thread header.
535 GCC_AC_THREAD_HEADER([$target_thread_file])
537 # Substitute configuration variables
539 AC_SUBST(extra_parts)
540 AC_SUBST(asm_hidden_op)
541 AC_CONFIG_LINKS([enable-execute-stack.c:$enable_execute_stack])
542 AC_CONFIG_LINKS([unwind.h:$unwind_header])
543 AC_CONFIG_LINKS([md-unwind-support.h:config/$md_unwind_header])
544 AC_CONFIG_LINKS([sfp-machine.h:config/$sfp_machine_header])
545 AC_CONFIG_LINKS([gthr-default.h:$thread_header])
547 # We need multilib support.
548 AC_CONFIG_FILES([Makefile])
549 AC_CONFIG_COMMANDS([default],
550 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
551 if test -n "$CONFIG_FILES"; then
552 # FIXME: We shouldn't need to set ac_file
554 . ${libgcc_topdir}/config-ml.in
558 with_target_subdir=${with_target_subdir}
559 with_multisubdir=${with_multisubdir}
560 ac_configure_args="--enable-multilib ${ac_configure_args}"
561 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
562 libgcc_topdir=${libgcc_topdir}