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)
13 sinclude(../config/sjlj.m4)
14 sinclude(../config/cet.m4)
16 AC_INIT([GNU C Runtime Library], 1.0,,[libgcc])
17 AC_CONFIG_SRCDIR([static-object.mk])
19 # The libgcc should not depend on any header files
20 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
21 [m4_divert_text([DEFAULTS],
22 [ac_includes_default='/* none */'])])
24 AC_ARG_WITH(target-subdir,
25 [ --with-target-subdir=SUBDIR Configuring in a subdirectory for target])
26 AC_ARG_WITH(cross-host,
27 [ --with-cross-host=HOST Configuring with a cross compiler])
29 [ --with-ld arrange to use the specified ld (full pathname)])
31 if test "${srcdir}" = "."; then
32 if test -n "${with_build_subdir}"; then
33 libgcc_topdir="${srcdir}/../.."
35 elif test -z "${with_target_subdir}"; then
36 libgcc_topdir="${srcdir}/.."
38 if test "${with_target_subdir}" != "."; then
39 libgcc_topdir="${srcdir}/${with_multisrctop}../.."
41 libgcc_topdir="${srcdir}/${with_multisrctop}.."
45 libgcc_topdir="${srcdir}/.."
47 AC_SUBST(libgcc_topdir)
48 AC_CONFIG_AUX_DIR($libgcc_topdir)
49 AC_CONFIG_HEADER(auto-target.h:config.in)
52 [ --disable-shared don't provide a shared libgcc],
54 case $enable_shared in
58 IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
59 for pkg in $enableval; do
60 if test "X$pkg" = "Xgcc" || test "X$pkg" = "Xlibgcc"; then
67 ], [enable_shared=yes])
68 AC_SUBST(enable_shared)
71 [ --disable-gcov don't provide libgcov and related host tools],
72 [], [enable_gcov=yes])
75 AC_ARG_ENABLE(vtable-verify,
76 [ --enable-vtable-verify Enable vtable verification feature ],
78 yes) enable_vtable_verify=yes ;;
79 no) enable_vtable_verify=no ;;
80 *) enable_vtable_verify=no;;
82 [enable_vtable_verify=no])
83 AC_SUBST(enable_vtable_verify)
85 AC_ARG_WITH(aix-soname,
86 [AS_HELP_STRING([--with-aix-soname=aix|svr4|both],
87 [shared library versioning (aka "SONAME") variant to provide on AIX])],
88 [case "${host}:${enable_shared}" in
89 power*-*-aix[[5-9]]*:yes)
90 AC_MSG_CHECKING([which variant of shared library versioning to provide for shared libgcc])
93 *) AC_MSG_ERROR([Unknown argument to --with-aix-soname]);;
95 AC_MSG_RESULT($withval)
97 *) with_aix_soname=aix ;;
99 ], [with_aix_soname=aix])
100 AC_SUBST(with_aix_soname)
105 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
106 AC_ARG_ENABLE(version-specific-runtime-libs,
107 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
108 [case "$enableval" in
109 yes) version_specific_libs=yes ;;
110 no) version_specific_libs=no ;;
111 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
113 [version_specific_libs=no])
114 AC_MSG_RESULT($version_specific_libs)
117 [ --with-slibdir=DIR shared libraries in DIR [LIBDIR]],
118 slibdir="$with_slibdir",
119 if test "${version_specific_libs}" = yes; then
120 slibdir='$(libsubdir)'
121 elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then
122 slibdir='$(exec_prefix)/$(host_noncanonical)/lib'
128 # Command-line options.
129 # Very limited version of AC_MAINTAINER_MODE.
130 AC_ARG_ENABLE([maintainer-mode],
131 [AC_HELP_STRING([--enable-maintainer-mode],
132 [enable make rules and dependencies not useful (and
133 sometimes confusing) to the casual installer])],
134 [case ${enable_maintainer_mode} in
137 *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
139 maintainer_mode=${enableval}],
146 # We need awk; bail out if it's missing.
148 "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
152 ACX_NONCANONICAL_HOST
153 ACX_NONCANONICAL_TARGET
156 # Calculate toolexeclibdir
157 # Also toolexecdir, though it's only used in toolexeclibdir
158 case ${version_specific_libs} in
160 # Need the gcc compiler version to know where to install libraries
161 # and header files if --enable-version-specific-runtime-libs option
163 toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
164 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
167 if test -n "$with_cross_host" &&
168 test x"$with_cross_host" != x"no"; then
169 # Install a library built with a cross compiler in tooldir, not libdir.
170 toolexecdir='$(exec_prefix)/$(target_noncanonical)'
171 toolexeclibdir='$(toolexecdir)/lib'
173 toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
174 toolexeclibdir='$(libdir)'
176 multi_os_directory=`$CC -print-multi-os-directory`
177 case $multi_os_directory in
178 .) ;; # Avoid trailing /.
179 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
183 AC_SUBST(toolexecdir)
184 AC_SUBST(toolexeclibdir)
186 dnl These must be called before AM_PROG_LIBTOOL, because it may want
187 dnl to call AC_CHECK_PROG.
188 AC_CHECK_TOOL(AR, ar)
189 AC_CHECK_TOOL(LIPO, lipo, :)
190 AC_CHECK_TOOL(NM, nm)
191 AC_CHECK_TOOL(RANLIB, ranlib, :)
192 AC_CHECK_TOOL(STRIP, strip, :)
201 AC_CHECK_SIZEOF([double])
202 AC_CHECK_SIZEOF([long double])
203 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
204 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
205 AC_SUBST(double_type_size)
206 AC_SUBST(long_double_type_size)
208 AC_CHECK_HEADERS(inttypes.h stdint.h stdlib.h ftw.h \
209 unistd.h sys/stat.h sys/types.h \
210 string.h strings.h memory.h sys/auxv.h)
213 # Check for decimal float support.
214 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
215 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
220 FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT;
223 [libgcc_cv_dfp=no])])
224 decimal_float=$libgcc_cv_dfp
225 AC_SUBST(decimal_float)
227 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
229 # Check for fixed-point support.
230 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
231 [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_Sat _Fract x;])],
232 [libgcc_cv_fixed_point=yes],
233 [libgcc_cv_fixed_point=no])])
234 fixed_point=$libgcc_cv_fixed_point
235 AC_SUBST(fixed_point)
237 # For platforms with the unwind ABI which includes an unwind library,
238 # libunwind, we can choose to use the system libunwind.
239 # config.gcc also contains tests of with_system_libunwind.
240 GCC_CHECK_UNWIND_GETIPINFO
242 # Check if the compiler is configured for setjmp/longjmp exceptions.
243 GCC_CHECK_SJLJ_EXCEPTIONS
245 GCC_CET_FLAGS(CET_FLAGS)
248 AC_ARG_ENABLE([explicit-exception-frame-registration],
249 [AC_HELP_STRING([--enable-explicit-exception-frame-registration],
250 [register exception tables explicitly at module start, for use
251 e.g. for compatibility with installations without PT_GNU_EH_FRAME support])],
253 force_explicit_eh_registry=
254 if test "$enable_explicit_exception_frame_registration" = yes; then
255 if test $ac_cv_sjlj_exceptions = yes; then
256 AC_MSG_ERROR([Can't --enable-explicit-exception-frame-registration
257 with setjmp/longjmp exceptions])
259 force_explicit_eh_registry=-DUSE_EH_FRAME_REGISTRY_ALWAYS
262 AC_SUBST([force_explicit_eh_registry])
264 AC_ARG_ENABLE([tm-clone-registry],
265 [ --disable-tm-clone-registry disable TM clone registry],
267 use_tm_clone_registry=
268 if test "$enable_tm_clone_registry" = no; then
269 use_tm_clone_registry=-DUSE_TM_CLONE_REGISTRY=0
273 use_tm_clone_registry=
276 use_tm_clone_registry=-DUSE_TM_CLONE_REGISTRY=0
280 AC_SUBST([use_tm_clone_registry])
284 AC_MSG_CHECKING([for thread model used by GCC])
285 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
286 AC_MSG_RESULT([$target_thread_file])
288 # Check for assembler CFI support.
289 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
291 [AC_LANG_SOURCE([asm("\n\
294 .cfi_personality 0, symbol\n\
297 [libgcc_cv_cfi=no])])
299 # Check 32bit or 64bit. In the case of MIPS, this really determines the
300 # word size rather than the address size.
301 cat > conftest.c <<EOF
302 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \
309 eval `${CC-cc} -E conftest.c | grep host_address=`
314 AC_CACHE_CHECK([whether the target is hard-float],
315 [libgcc_cv_mips_hard_float],
317 [AC_LANG_SOURCE([#ifndef __mips_hard_float
321 [libgcc_cv_mips_hard_float=yes],
322 [libgcc_cv_mips_hard_float=no])])
327 # Check for system-provided CRTs on Solaris 11.4.
328 AC_CACHE_CHECK([system-provided CRTs on Solaris],
329 [libgcc_cv_solaris_crts],
330 [libgcc_cv_solaris_crts=no
331 libgcc_sysroot="`${CC} -print-sysroot`"
332 libgcc_libdir="$libgcc_sysroot/usr/lib"
333 # At the time they were added, gcrt1.o became a symlink for backwards
334 # compatibility on x86, while crt1.o was added on sparc, so check for that.
336 i?86-*-solaris2* | x86_64-*-solaris2*)
337 if test -h "$libgcc_libdir/gcrt1.o"; then libgcc_cv_solaris_crts=yes; fi
340 if test -f "$libgcc_libdir/crt1.o"; then libgcc_cv_solaris_crts=yes; fi
343 if test $libgcc_cv_solaris_crts = yes; then
344 AC_DEFINE(HAVE_SOLARIS_CRTS, 1,
345 [Define if the system-provided CRTs are present on Solaris.])
350 # Determine the version of glibc, if any, used on the target.
351 AC_MSG_CHECKING([for target glibc version])
352 AC_ARG_WITH([glibc-version],
353 [AS_HELP_STRING([--with-glibc-version=M.N],
354 [assume GCC used with glibc version M.N or later])], [
355 if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then
356 glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'`
357 glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'`
359 AC_MSG_ERROR([option --with-glibc-version requires a version number M.N])
361 AC_COMPUTE_INT([glibc_version_major], [__GLIBC__],
362 [#include <features.h>],
363 [glibc_version_major=0])
364 AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__],
365 [#include <features.h>],
366 [glibc_version_minor=0])])
367 AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor])
369 # Determine floating-point type for powerpc*-*-linux*.
370 # Single-precision-only FPRs are not a supported configuration for
371 # this target, so are not allowed for in this test.
374 cat > conftest.c <<EOF
377 #elif defined _SOFT_FLOAT
379 #elif defined _SOFT_DOUBLE
381 #elif defined __NO_FPRS__
387 eval `${CC-cc} -E conftest.c | grep ppc_fp_type=`
389 # glibc 2.19 and later provide all the soft-fp functions, with proper
390 # interactions with <fenv.h> exception and rounding mode handling, so
391 # make libgcc's versions into compat symbols if a recent enough glibc
392 # version is being used.
394 case ${ppc_fp_type} in
396 if test $glibc_version_major -gt 2 \
397 || ( test $glibc_version_major -eq 2 \
398 && test $glibc_version_minor -ge 19 ); then
399 ppc_fp_compat="t-softfp-compat"
407 # At present, we cannot turn -mfloat128 on via #pragma GCC target, so just
408 # check if we have VSX (ISA 2.06) support to build the software libraries, and
409 # whether the assembler can handle xsaddqp for hardware support. Also check if
410 # a new glibc is being used so that __builtin_cpu_supports can be used.
412 saved_CFLAGS="$CFLAGS"
413 CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
414 AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
415 [libgcc_cv_powerpc_float128],
417 [AC_LANG_SOURCE([vector double dadd (vector double a, vector double b) { return a + b; }])],
418 [libgcc_cv_powerpc_float128=yes],
419 [libgcc_cv_powerpc_float128=no])])
421 CFLAGS="$CFLAGS -mpower9-vector -mfloat128-hardware"
422 AC_CACHE_CHECK([for PowerPC ISA 3.0 to build hardware __float128 libraries],
423 [libgcc_cv_powerpc_float128_hw],
425 [AC_LANG_SOURCE([#include <sys/auxv.h>
427 #error "AT_PLATFORM is not defined"
429 #ifndef __BUILTIN_CPU_SUPPORTS__
430 #error "__builtin_cpu_supports is not available"
432 vector unsigned char add (vector unsigned char a, vector unsigned char b)
434 vector unsigned char ret;
435 __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b));
438 void *add_resolver (void) { return (void *) add; }
439 __float128 add_ifunc (__float128, __float128)
440 __attribute__ ((__ifunc__ ("add_resolver")));])],
441 [libgcc_cv_powerpc_float128_hw=yes],
442 [libgcc_cv_powerpc_float128_hw=no])])
443 CFLAGS="$saved_CFLAGS"
446 # Collect host-machine-specific information.
447 . ${srcdir}/config.host
449 # Used for constructing correct paths for offload compilers.
451 real_host_noncanonical=${host_noncanonical}
452 if test x"$enable_as_accelerator_for" != x; then
453 accel_dir_suffix=/accel/${target_noncanonical}
454 real_host_noncanonical=${enable_as_accelerator_for}
456 AC_SUBST(accel_dir_suffix)
457 AC_SUBST(real_host_noncanonical)
459 if test x"$enable_offload_targets" != x; then
460 extra_parts="${extra_parts} crtoffloadbegin.o crtoffloadend.o crtoffloadtable.o"
463 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
464 # This is after config.host so we can augment tmake_file.
465 # Link with -nostartfiles -nodefaultlibs since neither are present while
468 i?86-*-solaris2* | x86_64-*-solaris2*)
469 cat > conftest.s <<EOF
470 .section .eh_frame,"a",@unwind
472 .section .jcr,"aw",@progbits
475 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
476 tmake_file="${tmake_file} i386/t-crtstuff"
481 # Check if Solaris linker support v2 linker mapfile syntax.
482 # Link with -nostartfiles -nodefaultlibs since neither are present while
486 solaris_ld_v2_maps=no
487 echo 'int main(void) {return 0;}' > conftest.c
488 echo '$mapfile_version 2' > conftest.map
489 if AC_TRY_COMMAND([${CC-cc} -nostartfiles -nodefaultlibs -Wl,-M,conftest.map -o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
490 solaris_ld_v2_maps=yes
494 AC_SUBST(solaris_ld_v2_maps)
496 # Check if xtensa target is configured for windowed ABI and thus needs to use
497 # custom unwind code.
498 # This is after config.host so we can augment tmake_file.
501 cat > conftest.c <<EOF
502 #ifdef __XTENSA_CALL0_ABI__
506 if AC_TRY_COMMAND(${CC-cc} -E -o conftest.i conftest.c 1>&AS_MESSAGE_LOG_FD); then
507 tmake_file="${tmake_file} xtensa/t-windowed"
512 # Check for visibility support. This is after config.host so that
513 # we can check for asm_hidden_op.
514 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
515 libgcc_cv_hidden_visibility_attribute, [
516 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
517 libgcc_cv_hidden_visibility_attribute=no
518 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
519 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
520 libgcc_cv_hidden_visibility_attribute=yes
526 if test $libgcc_cv_hidden_visibility_attribute = yes; then
527 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
528 AC_DEFINE_UNQUOTED(AS_HIDDEN_DIRECTIVE, $asm_hidden_op, [Define to the .hidden-like directive if it exists.])
534 # Check for .cfi_sections .debug_frame support.
535 AC_CACHE_CHECK([for .cfi_sections .debug_frame],
536 libgcc_cv_cfi_sections_directive, [
537 echo 'int foo (int, char *);' > conftest.c
538 echo 'int bar (int x) { char *y = __builtin_alloca (x); return foo (x + 1, y) + 1; }' >> conftest.c
539 libgcc_cv_cfi_sections_directive=no
540 if AC_TRY_COMMAND(${CC-cc} -Werror -g -fno-asynchronous-unwind-tables -fno-unwind-tables -fno-exceptions -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
541 if grep "\\.cfi_sections.*\\.debug_frame" conftest.s >/dev/null; then
542 libgcc_cv_cfi_sections_directive=yes
547 if test $libgcc_cv_cfi_sections_directive = yes; then
548 AC_DEFINE(HAVE_AS_CFI_SECTIONS, 1, [Define to 1 if the assembler supports .cfi_sections .debug_frame directive.])
551 # See if we have thread-local storage. We can only test assembler
552 # since link-time and run-time tests require the newly built
553 # gcc, which can't be used to build executable due to that libgcc
554 # is yet to be built here.
557 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
558 set_have_cc_tls="-DHAVE_CC_TLS"
560 AC_SUBST(set_have_cc_tls)
562 # See if we have emulated thread-local storage.
565 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
566 set_use_emutls="-DUSE_EMUTLS"
568 AC_SUBST(set_use_emutls)
570 dnl Check if as supports AVX instructions.
571 AC_DEFUN([LIBGCC_CHECK_AS_AVX], [
573 i[[34567]]86-*-* | x86_64-*-*)
574 AC_CACHE_CHECK([if the assembler supports AVX], libgcc_cv_as_avx, [
575 AC_TRY_COMPILE([], [asm("vzeroupper");],
576 [libgcc_cv_as_avx=yes], [libgcc_cv_as_avx=no])
578 if test x$libgcc_cv_as_avx = xyes; then
579 AC_DEFINE(HAVE_AS_AVX, 1, [Define to 1 if the assembler supports AVX.])
585 dnl Check if as supports RTM instructions.
586 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
587 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
588 [[void ip (void) __attribute__ ((constructor (1)));]])],
589 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
590 if test $libgcc_cv_init_priority = yes; then
591 AC_DEFINE(HAVE_INIT_PRIORITY, 1,
592 [Define if the compiler supports init priority.])
595 # Conditionalize the sfp-machine.h header for this target machine.
596 if test -z "${sfp_machine_header}"; then
597 sfp_machine_header=$cpu_type/sfp-machine.h
598 if test -f ${srcdir}/config/${sfp_machine_header}; then
601 sfp_machine_header=no-sfp-machine.h
604 AC_SUBST(sfp_machine_header)
606 # Conditionalize the makefile for this target machine.
608 for f in ${tmake_file}
610 if test -f ${srcdir}/config/$f
612 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
615 tmake_file="${tmake_file_}"
618 # Likewise export definitions for libgcc_tm.h
622 tm_file_="${tm_file_} \$(srcdir)/config/$f"
624 tm_file="${tm_file_}"
628 # Map from thread model to thread header.
629 GCC_AC_THREAD_HEADER([$target_thread_file])
631 # Determine what GCC version number to use in filesystem paths.
634 # Substitute configuration variables
636 AC_SUBST(extra_parts)
637 AC_SUBST(asm_hidden_op)
638 AC_SUBST(enable_execute_stack)
639 AC_SUBST(unwind_header)
640 AC_SUBST(md_unwind_header)
641 AC_SUBST(sfp_machine_header)
642 AC_SUBST(thread_header)
644 # We need multilib support.
645 AC_CONFIG_FILES([Makefile])
646 AC_CONFIG_COMMANDS([default],
647 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
648 if test -n "$CONFIG_FILES"; then
649 # FIXME: We shouldn't need to set ac_file
651 . ${libgcc_topdir}/config-ml.in
655 with_target_subdir=${with_target_subdir}
656 with_multisubdir=${with_multisubdir}
657 ac_configure_args="--enable-multilib ${ac_configure_args}"
658 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
659 libgcc_topdir=${libgcc_topdir}