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)
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$pkg" = "Xlibgcc"; then
67 ], [enable_shared=yes])
68 AC_SUBST(enable_shared)
70 AC_ARG_ENABLE(vtable-verify,
71 [ --enable-vtable-verify Enable vtable verification feature ],
73 yes) enable_vtable_verify=yes ;;
74 no) enable_vtable_verify=no ;;
75 *) enable_vtable_verify=no;;
77 [enable_vtable_verify=no])
78 AC_SUBST(enable_vtable_verify)
80 AC_ARG_WITH(aix-soname,
81 [AS_HELP_STRING([--with-aix-soname=aix|svr4|both],
82 [shared library versioning (aka "SONAME") variant to provide on AIX])],
83 [case "${host}:${enable_shared}" in
84 power*-*-aix[[5-9]]*:yes)
85 AC_MSG_CHECKING([which variant of shared library versioning to provide for shared libgcc])
88 *) AC_MSG_ERROR([Unknown argument to --with-aix-soname]);;
90 AC_MSG_RESULT($withval)
92 *) with_aix_soname=aix ;;
94 ], [with_aix_soname=aix])
95 AC_SUBST(with_aix_soname)
100 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
101 AC_ARG_ENABLE(version-specific-runtime-libs,
102 [ --enable-version-specific-runtime-libs Specify that runtime libraries should be installed in a compiler-specific directory ],
103 [case "$enableval" in
104 yes) version_specific_libs=yes ;;
105 no) version_specific_libs=no ;;
106 *) AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
108 [version_specific_libs=no])
109 AC_MSG_RESULT($version_specific_libs)
112 [ --with-slibdir=DIR shared libraries in DIR [LIBDIR]],
113 slibdir="$with_slibdir",
114 if test "${version_specific_libs}" = yes; then
115 slibdir='$(libsubdir)'
116 elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then
117 slibdir='$(exec_prefix)/$(host_noncanonical)/lib'
123 # Command-line options.
124 # Very limited version of AC_MAINTAINER_MODE.
125 AC_ARG_ENABLE([maintainer-mode],
126 [AC_HELP_STRING([--enable-maintainer-mode],
127 [enable make rules and dependencies not useful (and
128 sometimes confusing) to the casual installer])],
129 [case ${enable_maintainer_mode} in
132 *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
134 maintainer_mode=${enableval}],
141 # We need awk; bail out if it's missing.
143 "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
147 ACX_NONCANONICAL_HOST
148 ACX_NONCANONICAL_TARGET
151 # Calculate toolexeclibdir
152 # Also toolexecdir, though it's only used in toolexeclibdir
153 case ${version_specific_libs} in
155 # Need the gcc compiler version to know where to install libraries
156 # and header files if --enable-version-specific-runtime-libs option
158 toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
159 toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
162 if test -n "$with_cross_host" &&
163 test x"$with_cross_host" != x"no"; then
164 # Install a library built with a cross compiler in tooldir, not libdir.
165 toolexecdir='$(exec_prefix)/$(target_noncanonical)'
166 toolexeclibdir='$(toolexecdir)/lib'
168 toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
169 toolexeclibdir='$(libdir)'
171 multi_os_directory=`$CC -print-multi-os-directory`
172 case $multi_os_directory in
173 .) ;; # Avoid trailing /.
174 *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
178 AC_SUBST(toolexecdir)
179 AC_SUBST(toolexeclibdir)
181 dnl These must be called before AM_PROG_LIBTOOL, because it may want
182 dnl to call AC_CHECK_PROG.
183 AC_CHECK_TOOL(AR, ar)
184 AC_CHECK_TOOL(LIPO, lipo, :)
185 AC_CHECK_TOOL(NM, nm)
186 AC_CHECK_TOOL(RANLIB, ranlib, :)
187 AC_CHECK_TOOL(STRIP, strip, :)
196 AC_CHECK_SIZEOF([double])
197 AC_CHECK_SIZEOF([long double])
198 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
199 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
200 AC_SUBST(double_type_size)
201 AC_SUBST(long_double_type_size)
203 AC_CHECK_HEADERS(inttypes.h stdint.h stdlib.h ftw.h \
204 unistd.h sys/stat.h sys/types.h \
205 string.h strings.h memory.h)
208 # Check for decimal float support.
209 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
210 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
215 FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT;
218 [libgcc_cv_dfp=no])])
219 decimal_float=$libgcc_cv_dfp
220 AC_SUBST(decimal_float)
222 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
224 # Check for fixed-point support.
225 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
226 [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
227 [libgcc_cv_fixed_point=no])])
228 fixed_point=$libgcc_cv_fixed_point
229 AC_SUBST(fixed_point)
231 # For platforms with the unwind ABI which includes an unwind library,
232 # libunwind, we can choose to use the system libunwind.
233 # config.gcc also contains tests of with_system_libunwind.
234 GCC_CHECK_UNWIND_GETIPINFO
236 # Check if the compiler is configured for setjmp/longjmp exceptions.
237 GCC_CHECK_SJLJ_EXCEPTIONS
239 AC_ARG_ENABLE([explicit-exception-frame-registration],
240 [AC_HELP_STRING([--enable-explicit-exception-frame-registration],
241 [register exception tables explicitly at module start, for use
242 e.g. for compatibility with installations without PT_GNU_EH_FRAME support])],
244 force_explicit_eh_registry=
245 if test "$enable_explicit_exception_frame_registration" = yes; then
246 if test $ac_cv_sjlj_exceptions = yes; then
247 AC_MSG_ERROR([Can't --enable-explicit-exception-frame-registration
248 with setjmp/longjmp exceptions])
250 force_explicit_eh_registry=-DUSE_EH_FRAME_REGISTRY_ALWAYS
253 AC_SUBST([force_explicit_eh_registry])
257 AC_MSG_CHECKING([for thread model used by GCC])
258 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
259 AC_MSG_RESULT([$target_thread_file])
261 # Check for assembler CFI support.
262 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
267 .cfi_personality 0, symbol\n\
270 [libgcc_cv_cfi=no])])
272 # Check 32bit or 64bit. In the case of MIPS, this really determines the
273 # word size rather than the address size.
274 cat > conftest.c <<EOF
275 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \
282 eval `${CC-cc} -E conftest.c | grep host_address=`
287 AC_CACHE_CHECK([whether the target is hard-float],
288 [libgcc_cv_mips_hard_float],
290 [#ifndef __mips_hard_float
293 [libgcc_cv_mips_hard_float=yes],
294 [libgcc_cv_mips_hard_float=no])])
299 # Check for system-provided CRTs on Solaris 11.x and Solaris 12.
300 AC_CACHE_CHECK([system-provided CRTs on Solaris],
301 [libgcc_cv_solaris_crts],
302 [libgcc_cv_solaris_crts=no
303 libgcc_sysroot="`${CC} -print-sysroot`"
304 libgcc_libdir="$libgcc_sysroot/usr/lib"
305 # At the time they were added, gcrt1.o became a symlink for backwards
306 # compatibility on x86, while crt1.o was added on sparc, so check for that.
308 i?86-*-solaris2* | x86_64-*-solaris2*)
309 if test -h "$libgcc_libdir/gcrt1.o"; then libgcc_cv_solaris_crts=yes; fi
312 if test -f "$libgcc_libdir/crt1.o"; then libgcc_cv_solaris_crts=yes; fi
315 if test $libgcc_cv_solaris_crts = yes; then
316 AC_DEFINE(HAVE_SOLARIS_CRTS, 1,
317 [Define if the system-provided CRTs are present on Solaris.])
322 # Determine the version of glibc, if any, used on the target.
323 AC_MSG_CHECKING([for target glibc version])
324 AC_ARG_WITH([glibc-version],
325 [AS_HELP_STRING([--with-glibc-version=M.N],
326 [assume GCC used with glibc version M.N or later])], [
327 if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then
328 glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'`
329 glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'`
331 AC_MSG_ERROR([option --with-glibc-version requires a version number M.N])
333 AC_COMPUTE_INT([glibc_version_major], [__GLIBC__],
334 [#include <features.h>],
335 [glibc_version_major=0])
336 AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__],
337 [#include <features.h>],
338 [glibc_version_minor=0])])
339 AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor])
341 # Determine floating-point type for powerpc*-*-linux*.
342 # Single-precision-only FPRs are not a supported configuration for
343 # this target, so are not allowed for in this test.
346 cat > conftest.c <<EOF
349 #elif defined _SOFT_FLOAT
351 #elif defined _SOFT_DOUBLE
353 #elif defined __NO_FPRS__
359 eval `${CC-cc} -E conftest.c | grep ppc_fp_type=`
361 # glibc 2.19 and later provide all the soft-fp functions, with proper
362 # interactions with <fenv.h> exception and rounding mode handling, so
363 # make libgcc's versions into compat symbols if a recent enough glibc
364 # version is being used.
366 case ${ppc_fp_type} in
368 if test $glibc_version_major -gt 2 \
369 || ( test $glibc_version_major -eq 2 \
370 && test $glibc_version_minor -ge 19 ); then
371 ppc_fp_compat="t-softfp-compat"
379 # At present, we cannot turn -mfloat128 on via #pragma GCC target,
380 # so just check if we have VSX (ISA 2.06) support to build the
381 # software libraries, and whether the assembler can handle xsaddqp
382 # for hardware support.
384 saved_CFLAGS="$CFLAGS"
385 CFLAGS="$CFLAGS -mabi=altivec -mvsx -mfloat128"
386 AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
387 [libgcc_cv_powerpc_float128],
389 [vector double dadd (vector double a, vector double b) { return a + b; }],
390 [libgcc_cv_powerpc_float128=yes],
391 [libgcc_cv_powerpc_float128=no])])
393 CFLAGS="$CFLAGS -mpower9-vector -mfloat128-hardware"
394 AC_CACHE_CHECK([for PowerPC ISA 3.0 to build hardware __float128 libraries],
395 [libgcc_cv_powerpc_float128_hw],
397 [#include <sys/auxv.h>
399 #error "AT_PLATFORM is not defined"
401 vector unsigned char add (vector unsigned char a, vector unsigned char b)
403 vector unsigned char ret;
404 __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b));
407 void *add_resolver (void) { return (void *) add; }
408 __float128 add_ifunc (__float128, __float128)
409 __attribute__ ((__ifunc__ ("add_resolver")));],
410 [libgcc_cv_powerpc_float128_hw=yes],
411 [libgcc_cv_powerpc_float128_hw=no])])
412 CFLAGS="$saved_CFLAGS"
415 # Collect host-machine-specific information.
416 . ${srcdir}/config.host
418 # Used for constructing correct paths for offload compilers.
420 real_host_noncanonical=${host_noncanonical}
421 if test x"$enable_as_accelerator_for" != x; then
422 accel_dir_suffix=/accel/${target_noncanonical}
423 real_host_noncanonical=${enable_as_accelerator_for}
425 AC_SUBST(accel_dir_suffix)
426 AC_SUBST(real_host_noncanonical)
428 if test x"$enable_offload_targets" != x; then
429 extra_parts="${extra_parts} crtoffloadbegin.o crtoffloadend.o crtoffloadtable.o"
432 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
433 # This is after config.host so we can augment tmake_file.
434 # Link with -nostartfiles -nodefaultlibs since neither are present while
437 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
438 cat > conftest.s <<EOF
439 .section .eh_frame,"a",@unwind
441 .section .jcr,"aw",@progbits
444 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
445 tmake_file="${tmake_file} i386/t-crtstuff"
450 # Check if xtensa target is configured for windowed ABI and thus needs to use
451 # custom unwind code.
452 # This is after config.host so we can augment tmake_file.
455 cat > conftest.c <<EOF
456 #ifdef __XTENSA_CALL0_ABI__
460 if AC_TRY_COMMAND(${CC-cc} -E -o conftest.i conftest.c 1>&AS_MESSAGE_LOG_FD); then
461 tmake_file="${tmake_file} xtensa/t-windowed"
466 # Check for visibility support. This is after config.host so that
467 # we can check for asm_hidden_op.
468 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
469 libgcc_cv_hidden_visibility_attribute, [
470 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
471 libgcc_cv_hidden_visibility_attribute=no
472 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
473 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
474 libgcc_cv_hidden_visibility_attribute=yes
480 if test $libgcc_cv_hidden_visibility_attribute = yes; then
481 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
487 # See if we have thread-local storage. We can only test assembler
488 # since link-time and run-time tests require the newly built
489 # gcc, which can't be used to build executable due to that libgcc
490 # is yet to be built here.
493 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
494 set_have_cc_tls="-DHAVE_CC_TLS"
496 AC_SUBST(set_have_cc_tls)
498 # See if we have emulated thread-local storage.
501 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
502 set_use_emutls="-DUSE_EMUTLS"
504 AC_SUBST(set_use_emutls)
506 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
507 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
508 [[void ip (void) __attribute__ ((constructor (1)));]])],
509 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
510 if test $libgcc_cv_init_priority = yes; then
511 AC_DEFINE(HAVE_INIT_PRIORITY, 1,
512 [Define if the compiler supports init priority.])
515 # Conditionalize the sfp-machine.h header for this target machine.
516 if test -z "${sfp_machine_header}"; then
517 sfp_machine_header=$cpu_type/sfp-machine.h
518 if test -f ${srcdir}/config/${sfp_machine_header}; then
521 sfp_machine_header=no-sfp-machine.h
524 AC_SUBST(sfp_machine_header)
526 # Conditionalize the makefile for this target machine.
528 for f in ${tmake_file}
530 if test -f ${srcdir}/config/$f
532 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
535 tmake_file="${tmake_file_}"
538 # Likewise export definitions for libgcc_tm.h
542 tm_file_="${tm_file_} \$(srcdir)/config/$f"
544 tm_file="${tm_file_}"
548 # Map from thread model to thread header.
549 GCC_AC_THREAD_HEADER([$target_thread_file])
551 # Determine what GCC version number to use in filesystem paths.
554 # Substitute configuration variables
556 AC_SUBST(extra_parts)
557 AC_SUBST(asm_hidden_op)
558 AC_SUBST(enable_execute_stack)
559 AC_SUBST(unwind_header)
560 AC_SUBST(md_unwind_header)
561 AC_SUBST(sfp_machine_header)
562 AC_SUBST(thread_header)
564 # We need multilib support.
565 AC_CONFIG_FILES([Makefile])
566 AC_CONFIG_COMMANDS([default],
567 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
568 if test -n "$CONFIG_FILES"; then
569 # FIXME: We shouldn't need to set ac_file
571 . ${libgcc_topdir}/config-ml.in
575 with_target_subdir=${with_target_subdir}
576 with_multisubdir=${with_multisubdir}
577 ac_configure_args="--enable-multilib ${ac_configure_args}"
578 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
579 libgcc_topdir=${libgcc_topdir}