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])])
295 # Determine the version of glibc, if any, used on the target.
296 AC_MSG_CHECKING([for target glibc version])
297 AC_ARG_WITH([glibc-version],
298 [AS_HELP_STRING([--with-glibc-version=M.N],
299 [assume GCC used with glibc version M.N or later])], [
300 if [echo "$with_glibc_version" | grep '^[0-9][0-9]*\.[0-9][0-9]*$']; then
301 glibc_version_major=`echo "$with_glibc_version" | sed -e 's/\..*//'`
302 glibc_version_minor=`echo "$with_glibc_version" | sed -e 's/.*\.//'`
304 AC_MSG_ERROR([option --with-glibc-version requires a version number M.N])
306 AC_COMPUTE_INT([glibc_version_major], [__GLIBC__],
307 [#include <features.h>],
308 [glibc_version_major=0])
309 AC_COMPUTE_INT([glibc_version_minor], [__GLIBC_MINOR__],
310 [#include <features.h>],
311 [glibc_version_minor=0])])
312 AC_MSG_RESULT([$glibc_version_major.$glibc_version_minor])
314 # Determine floating-point type for powerpc*-*-linux*.
315 # Single-precision-only FPRs are not a supported configuration for
316 # this target, so are not allowed for in this test.
319 cat > conftest.c <<EOF
322 #elif defined _SOFT_FLOAT
324 #elif defined _SOFT_DOUBLE
326 #elif defined __NO_FPRS__
332 eval `${CC-cc} -E conftest.c | grep ppc_fp_type=`
334 # glibc 2.19 and later provide all the soft-fp functions, with proper
335 # interactions with <fenv.h> exception and rounding mode handling, so
336 # make libgcc's versions into compat symbols if a recent enough glibc
337 # version is being used.
339 case ${ppc_fp_type} in
341 if test $glibc_version_major -gt 2 \
342 || ( test $glibc_version_major -eq 2 \
343 && test $glibc_version_minor -ge 19 ); then
344 ppc_fp_compat="t-softfp-compat"
351 # Collect host-machine-specific information.
352 . ${srcdir}/config.host
354 # Used for constructing correct paths for offload compilers.
356 real_host_noncanonical=${host_noncanonical}
357 if test x"$enable_as_accelerator_for" != x; then
358 accel_dir_suffix=/accel/${target_noncanonical}
359 real_host_noncanonical=${enable_as_accelerator_for}
361 AC_SUBST(accel_dir_suffix)
362 AC_SUBST(real_host_noncanonical)
364 if test x"$enable_offload_targets" != x; then
365 extra_parts="${extra_parts} crtoffloadbegin.o crtoffloadend.o"
368 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
369 # This is after config.host so we can augment tmake_file.
370 # Link with -nostartfiles -nodefaultlibs since neither are present while
373 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
374 cat > conftest.s <<EOF
375 .section .eh_frame,"a",@unwind
377 .section .jcr,"aw",@progbits
380 if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
381 tmake_file="${tmake_file} i386/t-crtstuff"
386 # Check if xtensa target is configured for windowed ABI and thus needs to use
387 # custom unwind code.
388 # This is after config.host so we can augment tmake_file.
391 cat > conftest.c <<EOF
392 #ifdef __XTENSA_CALL0_ABI__
396 if AC_TRY_COMMAND(${CC-cc} -E -o conftest.i conftest.c 1>&AS_MESSAGE_LOG_FD); then
397 tmake_file="${tmake_file} xtensa/t-windowed"
402 # Check for visibility support. This is after config.host so that
403 # we can check for asm_hidden_op.
404 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
405 libgcc_cv_hidden_visibility_attribute, [
406 echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
407 libgcc_cv_hidden_visibility_attribute=no
408 if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
409 if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
410 libgcc_cv_hidden_visibility_attribute=yes
416 if test $libgcc_cv_hidden_visibility_attribute = yes; then
417 vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
423 # See if we have thread-local storage. We can only test assembler
424 # since link-time and run-time tests require the newly built
425 # gcc, which can't be used to build executable due to that libgcc
426 # is yet to be built here.
429 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
430 set_have_cc_tls="-DHAVE_CC_TLS"
432 AC_SUBST(set_have_cc_tls)
434 # See if we have emulated thread-local storage.
437 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
438 set_use_emutls="-DUSE_EMUTLS"
440 AC_SUBST(set_use_emutls)
442 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
443 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
444 [[void ip (void) __attribute__ ((constructor (1)));]])],
445 [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
446 if test $libgcc_cv_init_priority = yes; then
447 AC_DEFINE(HAVE_INIT_PRIORITY, 1,
448 [Define if the compiler supports init priority.])
451 # Conditionalize the sfp-machine.h header for this target machine.
452 if test -z "${sfp_machine_header}"; then
453 sfp_machine_header=$cpu_type/sfp-machine.h
454 if test -f ${srcdir}/config/${sfp_machine_header}; then
457 sfp_machine_header=no-sfp-machine.h
460 AC_SUBST(sfp_machine_header)
462 # Conditionalize the makefile for this target machine.
464 for f in ${tmake_file}
466 if test -f ${srcdir}/config/$f
468 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
471 tmake_file="${tmake_file_}"
474 # Likewise export definitions for libgcc_tm.h
478 tm_file_="${tm_file_} \$(srcdir)/config/$f"
480 tm_file="${tm_file_}"
484 # Map from thread model to thread header.
485 GCC_AC_THREAD_HEADER([$target_thread_file])
487 # Substitute configuration variables
489 AC_SUBST(extra_parts)
490 AC_SUBST(asm_hidden_op)
491 AC_CONFIG_LINKS([enable-execute-stack.c:$enable_execute_stack])
492 AC_CONFIG_LINKS([unwind.h:$unwind_header])
493 AC_CONFIG_LINKS([md-unwind-support.h:config/$md_unwind_header])
494 AC_CONFIG_LINKS([sfp-machine.h:config/$sfp_machine_header])
495 AC_CONFIG_LINKS([gthr-default.h:$thread_header])
497 # We need multilib support.
498 AC_CONFIG_FILES([Makefile])
499 AC_CONFIG_COMMANDS([default],
500 [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
501 if test -n "$CONFIG_FILES"; then
502 # FIXME: We shouldn't need to set ac_file
504 . ${libgcc_topdir}/config-ml.in
508 with_target_subdir=${with_target_subdir}
509 with_multisubdir=${with_multisubdir}
510 ac_configure_args="--enable-multilib ${ac_configure_args}"
511 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
512 libgcc_topdir=${libgcc_topdir}