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/$multi_os_directory ;;
178 AC_SUBST(toolexecdir)
179 AC_SUBST(toolexeclibdir)
181 dnl These must be called before AM_PROG_LIBTOOL, because it may want
182 dnl to call AC_CHECK_PROG.
183 AC_CHECK_TOOL(AR, ar)
184 AC_CHECK_TOOL(LIPO, lipo, :)
185 AC_CHECK_TOOL(NM, nm)
186 AC_CHECK_TOOL(RANLIB, ranlib, :)
187 AC_CHECK_TOOL(STRIP, strip, :)
194 AC_CHECK_SIZEOF([double])
195 AC_CHECK_SIZEOF([long double])
196 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
197 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
198 AC_SUBST(double_type_size)
199 AC_SUBST(long_double_type_size)
201 AC_CHECK_HEADERS(inttypes.h stdint.h stdlib.h ftw.h \
202 unistd.h sys/stat.h sys/types.h \
203 string.h strings.h memory.h)
206 # Check for decimal float support.
207 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
208 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
213 FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT;
216 [libgcc_cv_dfp=no])])
217 decimal_float=$libgcc_cv_dfp
218 AC_SUBST(decimal_float)
220 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
222 # Check for fixed-point support.
223 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
224 [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
225 [libgcc_cv_fixed_point=no])])
226 fixed_point=$libgcc_cv_fixed_point
227 AC_SUBST(fixed_point)
229 # For platforms with the unwind ABI which includes an unwind library,
230 # libunwind, we can choose to use the system libunwind.
231 # config.gcc also contains tests of with_system_libunwind.
232 GCC_CHECK_UNWIND_GETIPINFO
234 # Check if the compiler is configured for setjmp/longjmp exceptions.
235 GCC_CHECK_SJLJ_EXCEPTIONS
237 AC_ARG_ENABLE([explicit-exception-frame-registration],
238 [AC_HELP_STRING([--enable-explicit-exception-frame-registration],
239 [register exception tables explicitly at module start, for use
240 e.g. for compatibility with installations without PT_GNU_EH_FRAME support])],
242 force_explicit_eh_registry=
243 if test "$enable_explicit_exception_frame_registration" = yes; then
244 if test $ac_cv_sjlj_exceptions = yes; then
245 AC_MSG_ERROR([Can't --enable-explicit-exception-frame-registration
246 with setjmp/longjmp exceptions])
248 force_explicit_eh_registry=-DUSE_EH_FRAME_REGISTRY_ALWAYS
251 AC_SUBST([force_explicit_eh_registry])
255 AC_MSG_CHECKING([for thread model used by GCC])
256 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
257 AC_MSG_RESULT([$target_thread_file])
259 # Check for assembler CFI support.
260 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
265 .cfi_personality 0, symbol\n\
268 [libgcc_cv_cfi=no])])
270 # Check 32bit or 64bit. In the case of MIPS, this really determines the
271 # word size rather than the address size.
272 cat > conftest.c <<EOF
273 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \
280 eval `${CC-cc} -E conftest.c | grep host_address=`
285 AC_CACHE_CHECK([whether the target is hard-float],
286 [libgcc_cv_mips_hard_float],
288 [#ifndef __mips_hard_float
291 [libgcc_cv_mips_hard_float=yes],
292 [libgcc_cv_mips_hard_float=no])])
297 # Check for system-provided CRTs on Solaris 11.x and Solaris 12.
298 AC_CACHE_CHECK([system-provided CRTs on Solaris],
299 [libgcc_cv_solaris_crts],
300 [libgcc_cv_solaris_crts=no
301 libgcc_sysroot="`${CC} -print-sysroot`"
302 libgcc_libdir="$libgcc_sysroot/usr/lib"
303 # At the time they were added, gcrt1.o became a symlink for backwards
304 # compatibility on x86, while crt1.o was added on sparc, so check for that.
306 i?86-*-solaris2* | x86_64-*-solaris2*)
307 if test -h "$libgcc_libdir/gcrt1.o"; then libgcc_cv_solaris_crts=yes; fi
310 if test -f "$libgcc_libdir/crt1.o"; then libgcc_cv_solaris_crts=yes; fi
313 if test $libgcc_cv_solaris_crts = yes; then
314 AC_DEFINE(HAVE_SOLARIS_CRTS, 1,
315 [Define if the system-provided CRTs are present on Solaris.])
320 # Determine the version of glibc, if any, used on the target.
321 AC_MSG_CHECKING([for target glibc version])
322 AC_ARG_WITH([glibc-version],
323 [AS_HELP_STRING([--with-glibc-version=M.N],
324 [assume GCC used with glibc version M.N or later])], [
325 if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then
326 glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'`
327 glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'`
329 AC_MSG_ERROR([option --with-glibc-version requires a version number M.N])
331 AC_COMPUTE_INT([glibc_version_major], [__GLIBC__],
332 [#include <features.h>],
333 [glibc_version_major=0])
334 AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__],
335 [#include <features.h>],
336 [glibc_version_minor=0])])
337 AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor])
339 # Determine floating-point type for powerpc*-*-linux*.
340 # Single-precision-only FPRs are not a supported configuration for
341 # this target, so are not allowed for in this test.
344 cat > conftest.c <<EOF
347 #elif defined _SOFT_FLOAT
349 #elif defined _SOFT_DOUBLE
351 #elif defined __NO_FPRS__
357 eval `${CC-cc} -E conftest.c | grep ppc_fp_type=`
359 # glibc 2.19 and later provide all the soft-fp functions, with proper
360 # interactions with <fenv.h> exception and rounding mode handling, so
361 # make libgcc's versions into compat symbols if a recent enough glibc
362 # version is being used.
364 case ${ppc_fp_type} in
366 if test $glibc_version_major -gt 2 \
367 || ( test $glibc_version_major -eq 2 \
368 && test $glibc_version_minor -ge 19 ); then
369 ppc_fp_compat="t-softfp-compat"
377 # At present, we cannot turn -mfloat128 on via #pragma GCC target,
378 # so just check if we have VSX (ISA 2.06) support to build the
379 # software libraries, and whether the assembler can handle xsaddqp
380 # for hardware support.
382 AC_CACHE_CHECK([for PowerPC ISA 2.06 to build __float128 libraries],
383 [libgcc_cv_powerpc_float128],
385 [#pragma GCC target ("vsx")
386 vector double dadd (vector double a, vector double b) { return a + b; }],
387 [libgcc_cv_powerpc_float128=yes],
388 [libgcc_cv_powerpc_float128=no])])
390 AC_CACHE_CHECK([for PowerPC ISA 3.0 to build hardware __float128 libraries],
391 [libgcc_cv_powerpc_float128_hw],
393 [#pragma GCC target ("vsx,power9-vector")
394 #include <sys/auxv.h>
396 #error "AT_PLATFORM is not defined"
398 vector unsigned char (vector unsigned char a, vector unsigned char b)
400 vector unsigned char ret;
401 __asm__ ("xsaddqp %0,%1,%2" : "=v" (ret) : "v" (a), "v" (b));
404 void *add_resolver (void) { return (void *) add; }
405 __float128 add_ifunc (__float128, __float128)
406 __attribute__ ((__ifunc__ ("add_resolver")));],
407 [libgcc_cv_powerpc_float128_hw=yes],
408 [libgcc_cv_powerpc_float128_hw=no])])
411 # Collect host-machine-specific information.
412 . ${srcdir}/config.host
414 # Used for constructing correct paths for offload compilers.
416 real_host_noncanonical=${host_noncanonical}
417 if test x"$enable_as_accelerator_for" != x; then
418 accel_dir_suffix=/accel/${target_noncanonical}
419 real_host_noncanonical=${enable_as_accelerator_for}
421 AC_SUBST(accel_dir_suffix)
422 AC_SUBST(real_host_noncanonical)
424 if test x"$enable_offload_targets" != x; then
425 extra_parts="${extra_parts} crtoffloadbegin.o crtoffloadend.o crtoffloadtable.o"
428 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
429 # This is after config.host so we can augment tmake_file.
430 # Link with -nostartfiles -nodefaultlibs since neither are present while
433 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
434 cat > conftest.s <<EOF
435 .section .eh_frame,"a",@unwind
437 .section .jcr,"aw",@progbits
440 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
441 tmake_file="${tmake_file} i386/t-crtstuff"
446 # Check if xtensa target is configured for windowed ABI and thus needs to use
447 # custom unwind code.
448 # This is after config.host so we can augment tmake_file.
451 cat > conftest.c <<EOF
452 #ifdef __XTENSA_CALL0_ABI__
456 if AC_TRY_COMMAND(${CC-cc} -E -o conftest.i conftest.c 1>&AS_MESSAGE_LOG_FD); then
457 tmake_file="${tmake_file} xtensa/t-windowed"
462 # Check for visibility support. This is after config.host so that
463 # we can check for asm_hidden_op.
464 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
465 libgcc_cv_hidden_visibility_attribute, [
466 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
467 libgcc_cv_hidden_visibility_attribute=no
468 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
469 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
470 libgcc_cv_hidden_visibility_attribute=yes
476 if test $libgcc_cv_hidden_visibility_attribute = yes; then
477 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
483 # See if we have thread-local storage. We can only test assembler
484 # since link-time and run-time tests require the newly built
485 # gcc, which can't be used to build executable due to that libgcc
486 # is yet to be built here.
489 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
490 set_have_cc_tls="-DHAVE_CC_TLS"
492 AC_SUBST(set_have_cc_tls)
494 # See if we have emulated thread-local storage.
497 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
498 set_use_emutls="-DUSE_EMUTLS"
500 AC_SUBST(set_use_emutls)
502 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
503 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
504 [[void ip (void) __attribute__ ((constructor (1)));]])],
505 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
506 if test $libgcc_cv_init_priority = yes; then
507 AC_DEFINE(HAVE_INIT_PRIORITY, 1,
508 [Define if the compiler supports init priority.])
511 # Conditionalize the sfp-machine.h header for this target machine.
512 if test -z "${sfp_machine_header}"; then
513 sfp_machine_header=$cpu_type/sfp-machine.h
514 if test -f ${srcdir}/config/${sfp_machine_header}; then
517 sfp_machine_header=no-sfp-machine.h
520 AC_SUBST(sfp_machine_header)
522 # Conditionalize the makefile for this target machine.
524 for f in ${tmake_file}
526 if test -f ${srcdir}/config/$f
528 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
531 tmake_file="${tmake_file_}"
534 # Likewise export definitions for libgcc_tm.h
538 tm_file_="${tm_file_} \$(srcdir)/config/$f"
540 tm_file="${tm_file_}"
544 # Map from thread model to thread header.
545 GCC_AC_THREAD_HEADER([$target_thread_file])
547 # Substitute configuration variables
549 AC_SUBST(extra_parts)
550 AC_SUBST(asm_hidden_op)
551 AC_SUBST(enable_execute_stack)
552 AC_SUBST(unwind_header)
553 AC_SUBST(md_unwind_header)
554 AC_SUBST(sfp_machine_header)
555 AC_SUBST(thread_header)
557 # We need multilib support.
558 AC_CONFIG_FILES([Makefile])
559 AC_CONFIG_COMMANDS([default],
560 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
561 if test -n "$CONFIG_FILES"; then
562 # FIXME: We shouldn't need to set ac_file
564 . ${libgcc_topdir}/config-ml.in
568 with_target_subdir=${with_target_subdir}
569 with_multisubdir=${with_multisubdir}
570 ac_configure_args="--enable-multilib ${ac_configure_args}"
571 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
572 libgcc_topdir=${libgcc_topdir}