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)
17 AC_INIT([GNU C Runtime Library], 1.0,,[libgcc])
18 AC_CONFIG_SRCDIR([static-object.mk])
20 # The libgcc should not depend on any header files
21 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
22 [m4_divert_text([DEFAULTS],
23 [ac_includes_default='/* none */'])])
25 AC_ARG_WITH(target-subdir,
26 [ --with-target-subdir=SUBDIR Configuring in a subdirectory for target])
27 AC_ARG_WITH(cross-host,
28 [ --with-cross-host=HOST Configuring with a cross compiler])
30 [ --with-ld arrange to use the specified ld (full pathname)])
32 if test "${srcdir}" = "."; then
33 if test -n "${with_build_subdir}"; then
34 libgcc_topdir="${srcdir}/../.."
36 elif test -z "${with_target_subdir}"; then
37 libgcc_topdir="${srcdir}/.."
39 if test "${with_target_subdir}" != "."; then
40 libgcc_topdir="${srcdir}/${with_multisrctop}../.."
42 libgcc_topdir="${srcdir}/${with_multisrctop}.."
46 libgcc_topdir="${srcdir}/.."
48 AC_SUBST(libgcc_topdir)
49 AC_CONFIG_AUX_DIR($libgcc_topdir)
50 AC_CONFIG_HEADER(auto-target.h:config.in)
53 [ --disable-shared don't provide a shared libgcc],
55 case $enable_shared in
59 IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
60 for pkg in $enableval; do
61 if test "X$pkg" = "Xgcc" || test "X$pkg" = "Xlibgcc"; then
68 ], [enable_shared=yes])
69 AC_SUBST(enable_shared)
72 [ --disable-gcov don't provide libgcov and related host tools],
73 [], [enable_gcov=yes])
76 AC_ARG_ENABLE(vtable-verify,
77 [ --enable-vtable-verify Enable vtable verification feature ],
79 yes) enable_vtable_verify=yes ;;
80 no) enable_vtable_verify=no ;;
81 *) enable_vtable_verify=no;;
83 [enable_vtable_verify=no])
84 AC_SUBST(enable_vtable_verify)
86 AC_ARG_WITH(aix-soname,
87 [AS_HELP_STRING([--with-aix-soname=aix|svr4|both],
88 [shared library versioning (aka "SONAME") variant to provide on AIX])],
89 [case "${host}:${enable_shared}" in
90 power*-*-aix[[5-9]]*:yes)
91 AC_MSG_CHECKING([which variant of shared library versioning to provide for shared libgcc])
94 *) AC_MSG_ERROR([Unknown argument to --with-aix-soname]);;
96 AC_MSG_RESULT($withval)
98 *) with_aix_soname=aix ;;
100 ], [with_aix_soname=aix])
101 AC_SUBST(with_aix_soname)
106 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
107 AC_ARG_ENABLE(version-specific-runtime-libs,
108 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
109 [case "$enableval" in
110 yes) version_specific_libs=yes ;;
111 no) version_specific_libs=no ;;
112 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
114 [version_specific_libs=no])
115 AC_MSG_RESULT($version_specific_libs)
118 [ --with-slibdir=DIR shared libraries in DIR [LIBDIR]],
119 slibdir="$with_slibdir",
120 if test "${version_specific_libs}" = yes; then
121 slibdir='$(libsubdir)'
122 elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then
123 slibdir='$(exec_prefix)/$(host_noncanonical)/lib'
129 # Command-line options.
130 # Very limited version of AC_MAINTAINER_MODE.
131 AC_ARG_ENABLE([maintainer-mode],
132 [AC_HELP_STRING([--enable-maintainer-mode],
133 [enable make rules and dependencies not useful (and
134 sometimes confusing) to the casual installer])],
135 [case ${enable_maintainer_mode} in
138 *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
140 maintainer_mode=${enableval}],
147 # We need awk; bail out if it's missing.
149 "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
153 ACX_NONCANONICAL_HOST
154 ACX_NONCANONICAL_TARGET
157 # Calculate toolexeclibdir
158 # Also toolexecdir, though it's only used in toolexeclibdir
159 case ${version_specific_libs} in
161 # Need the gcc compiler version to know where to install libraries
162 # and header files if --enable-version-specific-runtime-libs option
164 toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
165 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
168 if test -n "$with_cross_host" &&
169 test x"$with_cross_host" != x"no"; then
170 # Install a library built with a cross compiler in tooldir, not libdir.
171 toolexecdir='$(exec_prefix)/$(target_noncanonical)'
172 toolexeclibdir='$(toolexecdir)/lib'
174 toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
175 toolexeclibdir='$(libdir)'
177 multi_os_directory=`$CC -print-multi-os-directory`
178 case $multi_os_directory in
179 .) ;; # Avoid trailing /.
180 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
184 AC_SUBST(toolexecdir)
185 AC_SUBST(toolexeclibdir)
187 dnl These must be called before AM_PROG_LIBTOOL, because it may want
188 dnl to call AC_CHECK_PROG.
189 AC_CHECK_TOOL(AR, ar)
190 AC_CHECK_TOOL(LIPO, lipo, :)
191 AC_CHECK_TOOL(NM, nm)
192 AC_CHECK_TOOL(RANLIB, ranlib, :)
193 AC_CHECK_TOOL(STRIP, strip, :)
202 AC_CHECK_SIZEOF([double])
203 AC_CHECK_SIZEOF([long double])
204 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
205 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
206 AC_SUBST(double_type_size)
207 AC_SUBST(long_double_type_size)
209 AC_CHECK_HEADERS(inttypes.h stdint.h stdlib.h ftw.h \
210 unistd.h sys/stat.h sys/types.h \
211 string.h strings.h memory.h)
214 # Check for decimal float support.
215 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
216 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
221 FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT;
224 [libgcc_cv_dfp=no])])
225 decimal_float=$libgcc_cv_dfp
226 AC_SUBST(decimal_float)
228 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
230 # Check for fixed-point support.
231 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
232 [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
233 [libgcc_cv_fixed_point=no])])
234 fixed_point=$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 $ac_cv_sjlj_exceptions = yes; then
256 AC_MSG_ERROR([Can't --enable-explicit-exception-frame-registration
257 with setjmp/longjmp exceptions])
259 force_explicit_eh_registry=-DUSE_EH_FRAME_REGISTRY_ALWAYS
262 AC_SUBST([force_explicit_eh_registry])
266 AC_MSG_CHECKING([for thread model used by GCC])
267 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
268 AC_MSG_RESULT([$target_thread_file])
270 # Check for assembler CFI support.
271 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
276 .cfi_personality 0, symbol\n\
279 [libgcc_cv_cfi=no])])
281 # Check 32bit or 64bit. In the case of MIPS, this really determines the
282 # word size rather than the address size.
283 cat > conftest.c <<EOF
284 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \
291 eval `${CC-cc} -E conftest.c | grep host_address=`
296 AC_CACHE_CHECK([whether the target is hard-float],
297 [libgcc_cv_mips_hard_float],
299 [#ifndef __mips_hard_float
302 [libgcc_cv_mips_hard_float=yes],
303 [libgcc_cv_mips_hard_float=no])])
308 # Check for system-provided CRTs on Solaris 11.4.
309 AC_CACHE_CHECK([system-provided CRTs on Solaris],
310 [libgcc_cv_solaris_crts],
311 [libgcc_cv_solaris_crts=no
312 libgcc_sysroot="`${CC} -print-sysroot`"
313 libgcc_libdir="$libgcc_sysroot/usr/lib"
314 # At the time they were added, gcrt1.o became a symlink for backwards
315 # compatibility on x86, while crt1.o was added on sparc, so check for that.
317 i?86-*-solaris2* | x86_64-*-solaris2*)
318 if test -h "$libgcc_libdir/gcrt1.o"; then libgcc_cv_solaris_crts=yes; fi
321 if test -f "$libgcc_libdir/crt1.o"; then libgcc_cv_solaris_crts=yes; fi
324 if test $libgcc_cv_solaris_crts = yes; then
325 AC_DEFINE(HAVE_SOLARIS_CRTS, 1,
326 [Define if the system-provided CRTs are present on Solaris.])
331 # Determine the version of glibc, if any, used on the target.
332 AC_MSG_CHECKING([for target glibc version])
333 AC_ARG_WITH([glibc-version],
334 [AS_HELP_STRING([--with-glibc-version=M.N],
335 [assume GCC used with glibc version M.N or later])], [
336 if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then
337 glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'`
338 glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'`
340 AC_MSG_ERROR([option --with-glibc-version requires a version number M.N])
342 AC_COMPUTE_INT([glibc_version_major], [__GLIBC__],
343 [#include <features.h>],
344 [glibc_version_major=0])
345 AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__],
346 [#include <features.h>],
347 [glibc_version_minor=0])])
348 AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor])
350 # Determine floating-point type for powerpc*-*-linux*.
351 # Single-precision-only FPRs are not a supported configuration for
352 # this target, so are not allowed for in this test.
355 cat > conftest.c <<EOF
358 #elif defined _SOFT_FLOAT
360 #elif defined _SOFT_DOUBLE
362 #elif defined __NO_FPRS__
368 eval `${CC-cc} -E conftest.c | grep ppc_fp_type=`
370 # glibc 2.19 and later provide all the soft-fp functions, with proper
371 # interactions with <fenv.h> exception and rounding mode handling, so
372 # make libgcc's versions into compat symbols if a recent enough glibc
373 # version is being used.
375 case ${ppc_fp_type} in
377 if test $glibc_version_major -gt 2 \
378 || ( test $glibc_version_major -eq 2 \
379 && test $glibc_version_minor -ge 19 ); then
380 ppc_fp_compat="t-softfp-compat"
388 # At present, we cannot turn -mfloat128 on via #pragma GCC target, so just
389 # check if we have VSX (ISA 2.06) support to build the software libraries, and
390 # whether the assembler can handle xsaddqp for hardware support. Also check if
391 # a new glibc is being used so that __builtin_cpu_supports can be used.
393 saved_CFLAGS="$CFLAGS"
394 CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
395 AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
396 [libgcc_cv_powerpc_float128],
398 [vector double dadd (vector double a, vector double b) { return a + b; }],
399 [libgcc_cv_powerpc_float128=yes],
400 [libgcc_cv_powerpc_float128=no])])
402 CFLAGS="$CFLAGS -mpower9-vector -mfloat128-hardware"
403 AC_CACHE_CHECK([for PowerPC ISA 3.0 to build hardware __float128 libraries],
404 [libgcc_cv_powerpc_float128_hw],
406 [#include <sys/auxv.h>
408 #error "AT_PLATFORM is not defined"
410 #ifndef __BUILTIN_CPU_SUPPORTS__
411 #error "__builtin_cpu_supports is not available"
413 vector unsigned char add (vector unsigned char a, vector unsigned char b)
415 vector unsigned char ret;
416 __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b));
419 void *add_resolver (void) { return (void *) add; }
420 __float128 add_ifunc (__float128, __float128)
421 __attribute__ ((__ifunc__ ("add_resolver")));],
422 [libgcc_cv_powerpc_float128_hw=yes],
423 [libgcc_cv_powerpc_float128_hw=no])])
424 CFLAGS="$saved_CFLAGS"
427 # Collect host-machine-specific information.
428 . ${srcdir}/config.host
430 # Used for constructing correct paths for offload compilers.
432 real_host_noncanonical=${host_noncanonical}
433 if test x"$enable_as_accelerator_for" != x; then
434 accel_dir_suffix=/accel/${target_noncanonical}
435 real_host_noncanonical=${enable_as_accelerator_for}
437 AC_SUBST(accel_dir_suffix)
438 AC_SUBST(real_host_noncanonical)
440 if test x"$enable_offload_targets" != x; then
441 extra_parts="${extra_parts} crtoffloadbegin.o crtoffloadend.o crtoffloadtable.o"
444 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
445 # This is after config.host so we can augment tmake_file.
446 # Link with -nostartfiles -nodefaultlibs since neither are present while
449 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
450 cat > conftest.s <<EOF
451 .section .eh_frame,"a",@unwind
453 .section .jcr,"aw",@progbits
456 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
457 tmake_file="${tmake_file} i386/t-crtstuff"
462 # Check if xtensa target is configured for windowed ABI and thus needs to use
463 # custom unwind code.
464 # This is after config.host so we can augment tmake_file.
467 cat > conftest.c <<EOF
468 #ifdef __XTENSA_CALL0_ABI__
472 if AC_TRY_COMMAND(${CC-cc} -E -o conftest.i conftest.c 1>&AS_MESSAGE_LOG_FD); then
473 tmake_file="${tmake_file} xtensa/t-windowed"
478 # Check for visibility support. This is after config.host so that
479 # we can check for asm_hidden_op.
480 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
481 libgcc_cv_hidden_visibility_attribute, [
482 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
483 libgcc_cv_hidden_visibility_attribute=no
484 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
485 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
486 libgcc_cv_hidden_visibility_attribute=yes
492 if test $libgcc_cv_hidden_visibility_attribute = yes; then
493 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
494 AC_DEFINE_UNQUOTED(AS_HIDDEN_DIRECTIVE, $asm_hidden_op, [Define to the .hidden-like directive if it exists.])
500 # Check for .cfi_sections .debug_frame support.
501 AC_CACHE_CHECK([for .cfi_sections .debug_frame],
502 libgcc_cv_cfi_sections_directive, [
503 echo 'int foo (int, char *);' > conftest.c
504 echo 'int bar (int x) { char *y = __builtin_alloca (x); return foo (x + 1, y) + 1; }' >> conftest.c
505 libgcc_cv_cfi_sections_directive=no
506 if AC_TRY_COMMAND(${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
507 if grep "\\.cfi_sections.*\\.debug_frame" conftest.s >/dev/null; then
508 libgcc_cv_cfi_sections_directive=yes
513 if test $libgcc_cv_cfi_sections_directive = yes; then
514 AC_DEFINE(HAVE_AS_CFI_SECTIONS, 1, [Define to 1 if the assembler supports .cfi_sections .debug_frame directive.])
517 # See if we have thread-local storage. We can only test assembler
518 # since link-time and run-time tests require the newly built
519 # gcc, which can't be used to build executable due to that libgcc
520 # is yet to be built here.
523 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
524 set_have_cc_tls="-DHAVE_CC_TLS"
526 AC_SUBST(set_have_cc_tls)
528 # See if we have emulated thread-local storage.
531 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
532 set_use_emutls="-DUSE_EMUTLS"
534 AC_SUBST(set_use_emutls)
536 dnl Check if as supports AVX instructions.
537 AC_DEFUN([LIBGCC_CHECK_AS_AVX], [
539 i[[34567]]86-*-* | x86_64-*-*)
540 AC_CACHE_CHECK([if the assembler supports AVX], libgcc_cv_as_avx, [
541 AC_TRY_COMPILE([], [asm("vzeroupper");],
542 [libgcc_cv_as_avx=yes], [libgcc_cv_as_avx=no])
544 if test x$libgcc_cv_as_avx = xyes; then
545 AC_DEFINE(HAVE_AS_AVX, 1, [Define to 1 if the assembler supports AVX.])
551 dnl Check if as supports RTM instructions.
552 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
553 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
554 [[void ip (void) __attribute__ ((constructor (1)));]])],
555 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
556 if test $libgcc_cv_init_priority = yes; then
557 AC_DEFINE(HAVE_INIT_PRIORITY, 1,
558 [Define if the compiler supports init priority.])
561 # Conditionalize the sfp-machine.h header for this target machine.
562 if test -z "${sfp_machine_header}"; then
563 sfp_machine_header=$cpu_type/sfp-machine.h
564 if test -f ${srcdir}/config/${sfp_machine_header}; then
567 sfp_machine_header=no-sfp-machine.h
570 AC_SUBST(sfp_machine_header)
572 # Conditionalize the makefile for this target machine.
574 for f in ${tmake_file}
576 if test -f ${srcdir}/config/$f
578 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
581 tmake_file="${tmake_file_}"
584 # Likewise export definitions for libgcc_tm.h
588 tm_file_="${tm_file_} \$(srcdir)/config/$f"
590 tm_file="${tm_file_}"
594 # Map from thread model to thread header.
595 GCC_AC_THREAD_HEADER([$target_thread_file])
597 # Determine what GCC version number to use in filesystem paths.
600 # Substitute configuration variables
602 AC_SUBST(extra_parts)
603 AC_SUBST(asm_hidden_op)
604 AC_SUBST(enable_execute_stack)
605 AC_SUBST(unwind_header)
606 AC_SUBST(md_unwind_header)
607 AC_SUBST(sfp_machine_header)
608 AC_SUBST(thread_header)
610 # We need multilib support.
611 AC_CONFIG_FILES([Makefile])
612 AC_CONFIG_COMMANDS([default],
613 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
614 if test -n "$CONFIG_FILES"; then
615 # FIXME: We shouldn't need to set ac_file
617 . ${libgcc_topdir}/config-ml.in
621 with_target_subdir=${with_target_subdir}
622 with_multisubdir=${with_multisubdir}
623 ac_configure_args="--enable-multilib ${ac_configure_args}"
624 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
625 libgcc_topdir=${libgcc_topdir}