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$pkg" = "Xlibgcc"; then
68 ], [enable_shared=yes])
69 AC_SUBST(enable_shared)
71 AC_ARG_ENABLE(vtable-verify,
72 [ --enable-vtable-verify Enable vtable verification feature ],
74 yes) enable_vtable_verify=yes ;;
75 no) enable_vtable_verify=no ;;
76 *) enable_vtable_verify=no;;
78 [enable_vtable_verify=no])
79 AC_SUBST(enable_vtable_verify)
81 AC_ARG_WITH(aix-soname,
82 [AS_HELP_STRING([--with-aix-soname=aix|svr4|both],
83 [shared library versioning (aka "SONAME") variant to provide on AIX])],
84 [case "${host}:${enable_shared}" in
85 power*-*-aix[[5-9]]*:yes)
86 AC_MSG_CHECKING([which variant of shared library versioning to provide for shared libgcc])
89 *) AC_MSG_ERROR([Unknown argument to --with-aix-soname]);;
91 AC_MSG_RESULT($withval)
93 *) with_aix_soname=aix ;;
95 ], [with_aix_soname=aix])
96 AC_SUBST(with_aix_soname)
101 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
102 AC_ARG_ENABLE(version-specific-runtime-libs,
103 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
104 [case "$enableval" in
105 yes) version_specific_libs=yes ;;
106 no) version_specific_libs=no ;;
107 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
109 [version_specific_libs=no])
110 AC_MSG_RESULT($version_specific_libs)
113 [ --with-slibdir=DIR shared libraries in DIR [LIBDIR]],
114 slibdir="$with_slibdir",
115 if test "${version_specific_libs}" = yes; then
116 slibdir='$(libsubdir)'
117 elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then
118 slibdir='$(exec_prefix)/$(host_noncanonical)/lib'
124 # Command-line options.
125 # Very limited version of AC_MAINTAINER_MODE.
126 AC_ARG_ENABLE([maintainer-mode],
127 [AC_HELP_STRING([--enable-maintainer-mode],
128 [enable make rules and dependencies not useful (and
129 sometimes confusing) to the casual installer])],
130 [case ${enable_maintainer_mode} in
133 *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
135 maintainer_mode=${enableval}],
142 # We need awk; bail out if it's missing.
144 "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
148 ACX_NONCANONICAL_HOST
149 ACX_NONCANONICAL_TARGET
152 # Calculate toolexeclibdir
153 # Also toolexecdir, though it's only used in toolexeclibdir
154 case ${version_specific_libs} in
156 # Need the gcc compiler version to know where to install libraries
157 # and header files if --enable-version-specific-runtime-libs option
159 toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
160 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
163 if test -n "$with_cross_host" &&
164 test x"$with_cross_host" != x"no"; then
165 # Install a library built with a cross compiler in tooldir, not libdir.
166 toolexecdir='$(exec_prefix)/$(target_noncanonical)'
167 toolexeclibdir='$(toolexecdir)/lib'
169 toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
170 toolexeclibdir='$(libdir)'
172 multi_os_directory=`$CC -print-multi-os-directory`
173 case $multi_os_directory in
174 .) ;; # Avoid trailing /.
175 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
179 AC_SUBST(toolexecdir)
180 AC_SUBST(toolexeclibdir)
182 dnl These must be called before AM_PROG_LIBTOOL, because it may want
183 dnl to call AC_CHECK_PROG.
184 AC_CHECK_TOOL(AR, ar)
185 AC_CHECK_TOOL(LIPO, lipo, :)
186 AC_CHECK_TOOL(NM, nm)
187 AC_CHECK_TOOL(RANLIB, ranlib, :)
188 AC_CHECK_TOOL(STRIP, strip, :)
197 AC_CHECK_SIZEOF([double])
198 AC_CHECK_SIZEOF([long double])
199 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
200 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
201 AC_SUBST(double_type_size)
202 AC_SUBST(long_double_type_size)
204 AC_CHECK_HEADERS(inttypes.h stdint.h stdlib.h ftw.h \
205 unistd.h sys/stat.h sys/types.h \
206 string.h strings.h memory.h)
209 # Check for decimal float support.
210 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
211 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
216 FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT;
219 [libgcc_cv_dfp=no])])
220 decimal_float=$libgcc_cv_dfp
221 AC_SUBST(decimal_float)
223 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
225 # Check for fixed-point support.
226 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
227 [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
228 [libgcc_cv_fixed_point=no])])
229 fixed_point=$libgcc_cv_fixed_point
230 AC_SUBST(fixed_point)
232 # For platforms with the unwind ABI which includes an unwind library,
233 # libunwind, we can choose to use the system libunwind.
234 # config.gcc also contains tests of with_system_libunwind.
235 GCC_CHECK_UNWIND_GETIPINFO
237 # Check if the compiler is configured for setjmp/longjmp exceptions.
238 GCC_CHECK_SJLJ_EXCEPTIONS
240 GCC_CET_FLAGS(CET_FLAGS)
243 AC_ARG_ENABLE([explicit-exception-frame-registration],
244 [AC_HELP_STRING([--enable-explicit-exception-frame-registration],
245 [register exception tables explicitly at module start, for use
246 e.g. for compatibility with installations without PT_GNU_EH_FRAME support])],
248 force_explicit_eh_registry=
249 if test "$enable_explicit_exception_frame_registration" = yes; then
250 if test $ac_cv_sjlj_exceptions = yes; then
251 AC_MSG_ERROR([Can't --enable-explicit-exception-frame-registration
252 with setjmp/longjmp exceptions])
254 force_explicit_eh_registry=-DUSE_EH_FRAME_REGISTRY_ALWAYS
257 AC_SUBST([force_explicit_eh_registry])
261 AC_MSG_CHECKING([for thread model used by GCC])
262 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
263 AC_MSG_RESULT([$target_thread_file])
265 # Check for assembler CFI support.
266 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
271 .cfi_personality 0, symbol\n\
274 [libgcc_cv_cfi=no])])
276 # Check 32bit or 64bit. In the case of MIPS, this really determines the
277 # word size rather than the address size.
278 cat > conftest.c <<EOF
279 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \
286 eval `${CC-cc} -E conftest.c | grep host_address=`
291 AC_CACHE_CHECK([whether the target is hard-float],
292 [libgcc_cv_mips_hard_float],
294 [#ifndef __mips_hard_float
297 [libgcc_cv_mips_hard_float=yes],
298 [libgcc_cv_mips_hard_float=no])])
303 # Check for system-provided CRTs on Solaris 11.4.
304 AC_CACHE_CHECK([system-provided CRTs on Solaris],
305 [libgcc_cv_solaris_crts],
306 [libgcc_cv_solaris_crts=no
307 libgcc_sysroot="`${CC} -print-sysroot`"
308 libgcc_libdir="$libgcc_sysroot/usr/lib"
309 # At the time they were added, gcrt1.o became a symlink for backwards
310 # compatibility on x86, while crt1.o was added on sparc, so check for that.
312 i?86-*-solaris2* | x86_64-*-solaris2*)
313 if test -h "$libgcc_libdir/gcrt1.o"; then libgcc_cv_solaris_crts=yes; fi
316 if test -f "$libgcc_libdir/crt1.o"; then libgcc_cv_solaris_crts=yes; fi
319 if test $libgcc_cv_solaris_crts = yes; then
320 AC_DEFINE(HAVE_SOLARIS_CRTS, 1,
321 [Define if the system-provided CRTs are present on Solaris.])
326 # Determine the version of glibc, if any, used on the target.
327 AC_MSG_CHECKING([for target glibc version])
328 AC_ARG_WITH([glibc-version],
329 [AS_HELP_STRING([--with-glibc-version=M.N],
330 [assume GCC used with glibc version M.N or later])], [
331 if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then
332 glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'`
333 glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'`
335 AC_MSG_ERROR([option --with-glibc-version requires a version number M.N])
337 AC_COMPUTE_INT([glibc_version_major], [__GLIBC__],
338 [#include <features.h>],
339 [glibc_version_major=0])
340 AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__],
341 [#include <features.h>],
342 [glibc_version_minor=0])])
343 AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor])
345 # Determine floating-point type for powerpc*-*-linux*.
346 # Single-precision-only FPRs are not a supported configuration for
347 # this target, so are not allowed for in this test.
350 cat > conftest.c <<EOF
353 #elif defined _SOFT_FLOAT
355 #elif defined _SOFT_DOUBLE
357 #elif defined __NO_FPRS__
363 eval `${CC-cc} -E conftest.c | grep ppc_fp_type=`
365 # glibc 2.19 and later provide all the soft-fp functions, with proper
366 # interactions with <fenv.h> exception and rounding mode handling, so
367 # make libgcc's versions into compat symbols if a recent enough glibc
368 # version is being used.
370 case ${ppc_fp_type} in
372 if test $glibc_version_major -gt 2 \
373 || ( test $glibc_version_major -eq 2 \
374 && test $glibc_version_minor -ge 19 ); then
375 ppc_fp_compat="t-softfp-compat"
383 # At present, we cannot turn -mfloat128 on via #pragma GCC target, so just
384 # check if we have VSX (ISA 2.06) support to build the software libraries, and
385 # whether the assembler can handle xsaddqp for hardware support. Also check if
386 # a new glibc is being used so that __builtin_cpu_supports can be used.
388 saved_CFLAGS="$CFLAGS"
389 CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
390 AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
391 [libgcc_cv_powerpc_float128],
393 [vector double dadd (vector double a, vector double b) { return a + b; }],
394 [libgcc_cv_powerpc_float128=yes],
395 [libgcc_cv_powerpc_float128=no])])
397 CFLAGS="$CFLAGS -mpower9-vector -mfloat128-hardware"
398 AC_CACHE_CHECK([for PowerPC ISA 3.0 to build hardware __float128 libraries],
399 [libgcc_cv_powerpc_float128_hw],
401 [#include <sys/auxv.h>
403 #error "AT_PLATFORM is not defined"
405 #ifndef __BUILTIN_CPU_SUPPORTS__
406 #error "__builtin_cpu_supports is not available"
408 vector unsigned char add (vector unsigned char a, vector unsigned char b)
410 vector unsigned char ret;
411 __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b));
414 void *add_resolver (void) { return (void *) add; }
415 __float128 add_ifunc (__float128, __float128)
416 __attribute__ ((__ifunc__ ("add_resolver")));],
417 [libgcc_cv_powerpc_float128_hw=yes],
418 [libgcc_cv_powerpc_float128_hw=no])])
419 CFLAGS="$saved_CFLAGS"
422 # Collect host-machine-specific information.
423 . ${srcdir}/config.host
425 # Used for constructing correct paths for offload compilers.
427 real_host_noncanonical=${host_noncanonical}
428 if test x"$enable_as_accelerator_for" != x; then
429 accel_dir_suffix=/accel/${target_noncanonical}
430 real_host_noncanonical=${enable_as_accelerator_for}
432 AC_SUBST(accel_dir_suffix)
433 AC_SUBST(real_host_noncanonical)
435 if test x"$enable_offload_targets" != x; then
436 extra_parts="${extra_parts} crtoffloadbegin.o crtoffloadend.o crtoffloadtable.o"
439 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
440 # This is after config.host so we can augment tmake_file.
441 # Link with -nostartfiles -nodefaultlibs since neither are present while
444 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
445 cat > conftest.s <<EOF
446 .section .eh_frame,"a",@unwind
448 .section .jcr,"aw",@progbits
451 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
452 tmake_file="${tmake_file} i386/t-crtstuff"
457 # Check if xtensa target is configured for windowed ABI and thus needs to use
458 # custom unwind code.
459 # This is after config.host so we can augment tmake_file.
462 cat > conftest.c <<EOF
463 #ifdef __XTENSA_CALL0_ABI__
467 if AC_TRY_COMMAND(${CC-cc} -E -o conftest.i conftest.c 1>&AS_MESSAGE_LOG_FD); then
468 tmake_file="${tmake_file} xtensa/t-windowed"
473 # Check for visibility support. This is after config.host so that
474 # we can check for asm_hidden_op.
475 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
476 libgcc_cv_hidden_visibility_attribute, [
477 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
478 libgcc_cv_hidden_visibility_attribute=no
479 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
480 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
481 libgcc_cv_hidden_visibility_attribute=yes
487 if test $libgcc_cv_hidden_visibility_attribute = yes; then
488 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
489 AC_DEFINE_UNQUOTED(AS_HIDDEN_DIRECTIVE, $asm_hidden_op, [Define to the .hidden-like directive if it exists.])
495 # Check for .cfi_sections .debug_frame support.
496 AC_CACHE_CHECK([for .cfi_sections .debug_frame],
497 libgcc_cv_cfi_sections_directive, [
498 echo 'int foo (int, char *);' > conftest.c
499 echo 'int bar (int x) { char *y = __builtin_alloca (x); return foo (x + 1, y) + 1; }' >> conftest.c
500 libgcc_cv_cfi_sections_directive=no
501 if AC_TRY_COMMAND(${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
502 if grep "\\.cfi_sections.*\\.debug_frame" conftest.s >/dev/null; then
503 libgcc_cv_cfi_sections_directive=yes
508 if test $libgcc_cv_cfi_sections_directive = yes; then
509 AC_DEFINE(HAVE_AS_CFI_SECTIONS, 1, [Define to 1 if the assembler supports .cfi_sections .debug_frame directive.])
512 # See if we have thread-local storage. We can only test assembler
513 # since link-time and run-time tests require the newly built
514 # gcc, which can't be used to build executable due to that libgcc
515 # is yet to be built here.
518 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
519 set_have_cc_tls="-DHAVE_CC_TLS"
521 AC_SUBST(set_have_cc_tls)
523 # See if we have emulated thread-local storage.
526 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
527 set_use_emutls="-DUSE_EMUTLS"
529 AC_SUBST(set_use_emutls)
531 dnl Check if as supports AVX instructions.
532 AC_DEFUN([LIBGCC_CHECK_AS_AVX], [
534 i[[34567]]86-*-* | x86_64-*-*)
535 AC_CACHE_CHECK([if the assembler supports AVX], libgcc_cv_as_avx, [
536 AC_TRY_COMPILE([], [asm("vzeroupper");],
537 [libgcc_cv_as_avx=yes], [libgcc_cv_as_avx=no])
539 if test x$libgcc_cv_as_avx = xyes; then
540 AC_DEFINE(HAVE_AS_AVX, 1, [Define to 1 if the assembler supports AVX.])
546 dnl Check if as supports RTM instructions.
547 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
548 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
549 [[void ip (void) __attribute__ ((constructor (1)));]])],
550 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
551 if test $libgcc_cv_init_priority = yes; then
552 AC_DEFINE(HAVE_INIT_PRIORITY, 1,
553 [Define if the compiler supports init priority.])
556 # Conditionalize the sfp-machine.h header for this target machine.
557 if test -z "${sfp_machine_header}"; then
558 sfp_machine_header=$cpu_type/sfp-machine.h
559 if test -f ${srcdir}/config/${sfp_machine_header}; then
562 sfp_machine_header=no-sfp-machine.h
565 AC_SUBST(sfp_machine_header)
567 # Conditionalize the makefile for this target machine.
569 for f in ${tmake_file}
571 if test -f ${srcdir}/config/$f
573 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
576 tmake_file="${tmake_file_}"
579 # Likewise export definitions for libgcc_tm.h
583 tm_file_="${tm_file_} \$(srcdir)/config/$f"
585 tm_file="${tm_file_}"
589 # Map from thread model to thread header.
590 GCC_AC_THREAD_HEADER([$target_thread_file])
592 # Determine what GCC version number to use in filesystem paths.
595 # Substitute configuration variables
597 AC_SUBST(extra_parts)
598 AC_SUBST(asm_hidden_op)
599 AC_SUBST(enable_execute_stack)
600 AC_SUBST(unwind_header)
601 AC_SUBST(md_unwind_header)
602 AC_SUBST(sfp_machine_header)
603 AC_SUBST(thread_header)
605 # We need multilib support.
606 AC_CONFIG_FILES([Makefile])
607 AC_CONFIG_COMMANDS([default],
608 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
609 if test -n "$CONFIG_FILES"; then
610 # FIXME: We shouldn't need to set ac_file
612 . ${libgcc_topdir}/config-ml.in
616 with_target_subdir=${with_target_subdir}
617 with_multisubdir=${with_multisubdir}
618 ac_configure_args="--enable-multilib ${ac_configure_args}"
619 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
620 libgcc_topdir=${libgcc_topdir}