* crtstuff.c (USE_EH_FRAME_REGISTRY): Let USE_EH_FRAME_REGISTRY_ALWAYS
[official-gcc.git] / libgcc / configure.ac
blob72a21a97e797f88503c4f4bb1d6d5655764c5021
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)
14 AC_PREREQ(2.64)
15 AC_INIT([GNU C Runtime Library], 1.0,,[libgcc])
16 AC_CONFIG_SRCDIR([static-object.mk])
18 # The libgcc should not depend on any header files
19 AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
20   [m4_divert_text([DEFAULTS],
21     [ac_includes_default='/* none */'])])
23 AC_ARG_WITH(target-subdir,
24 [  --with-target-subdir=SUBDIR      Configuring in a subdirectory for target])
25 AC_ARG_WITH(cross-host,
26 [  --with-cross-host=HOST           Configuring with a cross compiler])
27 AC_ARG_WITH(ld,
28 [  --with-ld               arrange to use the specified ld (full pathname)])
30 if test "${srcdir}" = "."; then
31   if test -n "${with_build_subdir}"; then
32     libgcc_topdir="${srcdir}/../.."
33     with_target_subdir=
34   elif test -z "${with_target_subdir}"; then
35     libgcc_topdir="${srcdir}/.."
36   else
37     if test "${with_target_subdir}" != "."; then
38       libgcc_topdir="${srcdir}/${with_multisrctop}../.."
39     else
40       libgcc_topdir="${srcdir}/${with_multisrctop}.."
41     fi
42   fi
43 else
44   libgcc_topdir="${srcdir}/.."
46 AC_SUBST(libgcc_topdir)
47 AC_CONFIG_AUX_DIR($libgcc_topdir)
48 AC_CONFIG_HEADER(auto-target.h:config.in)
50 AC_ARG_ENABLE(shared,
51 [  --disable-shared        don't provide a shared libgcc],
53   case $enable_shared in
54   yes | no) ;;
55   *)
56     enable_shared=no
57     IFS="${IFS=         }"; ac_save_ifs="$IFS"; IFS="${IFS}:,"
58     for pkg in $enableval; do
59       if test "X$pkg" = "Xgcc" || test "X$pkg" = "Xlibgcc"; then
60         enable_shared=yes
61       fi
62     done
63     IFS="$ac_save_ifs"
64     ;;
65   esac
66 ], [enable_shared=yes])
67 AC_SUBST(enable_shared)
69 AC_ARG_ENABLE(vtable-verify,
70 [  --enable-vtable-verify    Enable vtable verification feature ],
71 [case "$enableval" in
72  yes) enable_vtable_verify=yes ;;
73  no)  enable_vtable_verify=no ;;
74  *)   enable_vtable_verify=no;;
75  esac],
76 [enable_vtable_verify=no])
77 AC_SUBST(enable_vtable_verify)
79 GCC_PICFLAG
80 AC_SUBST(PICFLAG)
82 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
83 AC_ARG_ENABLE(version-specific-runtime-libs,
84 [  --enable-version-specific-runtime-libs    Specify that runtime libraries should be installed in a compiler-specific directory ],
85 [case "$enableval" in
86  yes) version_specific_libs=yes ;;
87  no)  version_specific_libs=no ;;
88  *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
89  esac],
90 [version_specific_libs=no])
91 AC_MSG_RESULT($version_specific_libs)
93 AC_ARG_WITH(slibdir,
94 [  --with-slibdir=DIR      shared libraries in DIR [LIBDIR]],
95 slibdir="$with_slibdir",
96 if test "${version_specific_libs}" = yes; then
97   slibdir='$(libsubdir)'
98 elif test -n "$with_cross_host" && test x"$with_cross_host" != x"no"; then
99   slibdir='$(exec_prefix)/$(host_noncanonical)/lib'
100 else
101   slibdir='$(libdir)'
103 AC_SUBST(slibdir)
105 # Command-line options.
106 # Very limited version of AC_MAINTAINER_MODE.
107 AC_ARG_ENABLE([maintainer-mode],
108   [AC_HELP_STRING([--enable-maintainer-mode],
109                  [enable make rules and dependencies not useful (and
110                   sometimes confusing) to the casual installer])],
111   [case ${enable_maintainer_mode} in
112      yes) MAINT='' ;;
113      no) MAINT='#' ;;
114      *) AC_MSG_ERROR([--enable-maintainer-mode must be yes or no]) ;;
115    esac
116    maintainer_mode=${enableval}],
117   [MAINT='#'])
118 AC_SUBST([MAINT])dnl
120 AC_PROG_INSTALL
122 AC_PROG_AWK
123 # We need awk; bail out if it's missing.
124 case ${AWK} in
125   "") AC_MSG_ERROR([can't build without awk, bailing out]) ;;
126 esac
128 AC_CANONICAL_HOST
129 ACX_NONCANONICAL_HOST
130 ACX_NONCANONICAL_TARGET
131 GCC_TOPLEV_SUBDIRS
133 # Calculate toolexeclibdir
134 # Also toolexecdir, though it's only used in toolexeclibdir
135 case ${version_specific_libs} in
136   yes)
137     # Need the gcc compiler version to know where to install libraries
138     # and header files if --enable-version-specific-runtime-libs option
139     # is selected.
140     toolexecdir='$(libdir)/gcc/$(target_noncanonical)'
141     toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
142     ;;
143   no)
144     if test -n "$with_cross_host" &&
145        test x"$with_cross_host" != x"no"; then
146       # Install a library built with a cross compiler in tooldir, not libdir.
147       toolexecdir='$(exec_prefix)/$(target_noncanonical)'
148       toolexeclibdir='$(toolexecdir)/lib'
149     else
150       toolexecdir='$(libdir)/gcc-lib/$(target_noncanonical)'
151       toolexeclibdir='$(libdir)'
152     fi
153     multi_os_directory=`$CC -print-multi-os-directory`
154     case $multi_os_directory in
155       .) ;; # Avoid trailing /.
156       *) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
157     esac
158     ;;
159 esac
160 AC_SUBST(toolexecdir)
161 AC_SUBST(toolexeclibdir)
163 dnl These must be called before AM_PROG_LIBTOOL, because it may want
164 dnl to call AC_CHECK_PROG.
165 AC_CHECK_TOOL(AR, ar)
166 AC_CHECK_TOOL(LIPO, lipo, :)
167 AC_CHECK_TOOL(NM, nm)
168 AC_CHECK_TOOL(RANLIB, ranlib, :)
169 AC_CHECK_TOOL(STRIP, strip, :)
170 AC_PROG_LN_S
172 GCC_NO_EXECUTABLES
173 AC_PROG_CC
174 AC_PROG_CPP_WERROR
176 AC_CHECK_SIZEOF([double])
177 AC_CHECK_SIZEOF([long double])
178 AS_VAR_ARITH([double_type_size], [$ac_cv_sizeof_double \* 8])
179 AS_VAR_ARITH([long_double_type_size], [$ac_cv_sizeof_long_double \* 8])
180 AC_SUBST(double_type_size)
181 AC_SUBST(long_double_type_size)
183 # Check for decimal float support.
184 AC_CACHE_CHECK([whether decimal floating point is supported], [libgcc_cv_dfp],
185                [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
186 #include <fenv.h>
187 ]], [[
188 _Decimal32 x;
189 int fe_except =
190   FE_INVALID|FE_DIVBYZERO|FE_OVERFLOW|FE_UNDERFLOW|FE_INEXACT;
191 ]])],
192                                   [libgcc_cv_dfp=yes],
193                                   [libgcc_cv_dfp=no])])
194 decimal_float=$libgcc_cv_dfp
195 AC_SUBST(decimal_float)
197 GCC_AC_ENABLE_DECIMAL_FLOAT([$host])
199 # Check for fixed-point support.
200 AC_CACHE_CHECK([whether fixed-point is supported], [libgcc_cv_fixed_point],
201                [AC_COMPILE_IFELSE([_Sat _Fract x;], [libgcc_cv_fixed_point=yes],
202                                   [libgcc_cv_fixed_point=no])])
203 fixed_point=$libgcc_cv_fixed_point
204 AC_SUBST(fixed_point)
206 # For platforms with the unwind ABI which includes an unwind library,
207 # libunwind, we can choose to use the system libunwind.
208 # config.gcc also contains tests of with_system_libunwind.
209 GCC_CHECK_UNWIND_GETIPINFO
211 # The sjlj test is almost duplicated here and in libgo/configure.ac (for C),
212 # libstdc++-v3/acinclude.m4 and libjava/configure.ac (for C++), and
213 # libobjc/configure.ac (for Objective-C).
214 # FIXME: This should be centralized in config/sjlj.m4.
215 AC_ARG_ENABLE(sjlj-exceptions,
216   AC_HELP_STRING([--enable-sjlj-exceptions],
217                  [force use of builtin_setjmp for exceptions]),
218   [case "$enableval" in
219    yes|no|auto) ;;
220    *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
221    esac],
222   [enable_sjlj_exceptions=auto])
224 AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
225 [libgcc_cv_lib_sjlj_exceptions],
226 [AC_LANG_CONFTEST(
227   [AC_LANG_SOURCE([
228 void bar ();
229 void clean (int *);
230 void foo ()
232   int i __attribute__ ((cleanup (clean)));
233   bar();
235 ])])
236 CFLAGS_hold=$CFLAGS
237 CFLAGS="--save-temps -fexceptions"
238 libgcc_cv_lib_sjlj_exceptions=unknown
239 AS_IF([ac_fn_c_try_compile],
240   [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
241     libgcc_cv_lib_sjlj_exceptions=yes
242   elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
243     libgcc_cv_lib_sjlj_exceptions=no
244   fi])
245 CFLAGS=$CFLAGS_hold
246 rm -f conftest*
249 if test "$enable_sjlj_exceptions" = "auto"; then
250   enable_sjlj_exceptions=$libgcc_cv_lib_sjlj_exceptions
253 case $enable_sjlj_exceptions in
254 yes)
255   AC_DEFINE(LIBGCC_SJLJ_EXCEPTIONS, 1,
256         [Define if the C compiler is configured for setjmp/longjmp exceptions.])
257   ;;
259   ;;
261   AC_MSG_ERROR([unable to detect exception model])
262   ;;
263 esac
265 AC_ARG_ENABLE([explicit-exception-frame-registration],
266   [AC_HELP_STRING([--enable-explicit-exception-frame-registration],
267      [register exception tables explicitly at module start, for use
268       e.g. for compatibility with installations without PT_GNU_EH_FRAME support])],
270 force_explicit_eh_registry=
271 if test "$enable_explicit_exception_frame_registration" = yes; then
272   if test "$enable_sjlj_exceptions" = yes; then
273     AC_MSG_ERROR([Can't enable both of --enable-sjlj-exceptions
274                   and --enable-explicit-exception-frame-registration])
275   fi
276   force_explicit_eh_registry=-DUSE_EH_FRAME_REGISTRY_ALWAYS
279 AC_SUBST([force_explicit_eh_registry])
281 AC_LIB_PROG_LD_GNU
283 AC_MSG_CHECKING([for thread model used by GCC])
284 target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
285 AC_MSG_RESULT([$target_thread_file]) 
287 # Check for assembler CFI support.
288 AC_CACHE_CHECK([whether assembler supports CFI directives], [libgcc_cv_cfi],
289                [AC_COMPILE_IFELSE(
290 [asm("\n\
291         .text\n\
292         .cfi_startproc\n\
293         .cfi_personality 0, symbol\n\
294         .cfi_endproc");],
295   [libgcc_cv_cfi=yes],
296   [libgcc_cv_cfi=no])])
298 # Check 32bit or 64bit.  In the case of MIPS, this really determines the
299 # word size rather than the address size.
300 cat > conftest.c <<EOF
301 #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \
302     || defined(__mips64)
303 host_address=64
304 #else
305 host_address=32
306 #endif
308 eval `${CC-cc} -E conftest.c | grep host_address=`
309 rm -f conftest.c
311 case ${host} in
312 mips*-*-*)
313   AC_CACHE_CHECK([whether the target is hard-float],
314                  [libgcc_cv_mips_hard_float],
315                  [AC_COMPILE_IFELSE(
316     [#ifndef __mips_hard_float
317      #error FOO
318      #endif],
319     [libgcc_cv_mips_hard_float=yes],
320     [libgcc_cv_mips_hard_float=no])])
321 esac
323 # Collect host-machine-specific information.
324 . ${srcdir}/config.host
326 # Check if Solaris/x86 linker supports ZERO terminator unwind entries.
327 # This is after config.host so we can augment tmake_file.
328 # Link with -nostartfiles -nodefaultlibs since neither are present while
329 # building libgcc.
330 case ${host} in
331 i?86-*-solaris2* | x86_64-*-solaris2.1[[0-9]]*)
332   cat > conftest.s <<EOF
333         .section        .eh_frame,"a",@unwind
334         .zero   4
335         .section        .jcr,"aw",@progbits
336         .zero   8
338   if AC_TRY_COMMAND(${CC-cc} -shared -nostartfiles -nodefaultlibs -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD); then
339       tmake_file="${tmake_file} i386/t-crtstuff"
340   fi
341   ;;
342 esac
344 # Check for visibility support.  This is after config.host so that
345 # we can check for asm_hidden_op.
346 AC_CACHE_CHECK([for __attribute__((visibility("hidden")))],
347     libgcc_cv_hidden_visibility_attribute, [
348         echo 'int __attribute__ ((visibility ("hidden"))) foo (void) { return 1; }' > conftest.c
349         libgcc_cv_hidden_visibility_attribute=no
350         if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
351             if grep "\\$asm_hidden_op.*foo" conftest.s >/dev/null; then
352                 libgcc_cv_hidden_visibility_attribute=yes
353             fi
354         fi
355         rm -f conftest.*
356     ])
358 if test $libgcc_cv_hidden_visibility_attribute = yes; then
359     vis_hide='-fvisibility=hidden -DHIDE_EXPORTS'
360 else
361     vis_hide=
363 AC_SUBST(vis_hide)
365 # See if we have thread-local storage.  We can only test assembler
366 # since link-time and run-time tests require the newly built
367 # gcc, which can't be used to build executable due to that libgcc
368 # is yet to be built here.
369 GCC_CHECK_CC_TLS
370 set_have_cc_tls=
371 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then
372   set_have_cc_tls="-DHAVE_CC_TLS"
374 AC_SUBST(set_have_cc_tls)
376 # See if we have emulated thread-local storage.
377 GCC_CHECK_EMUTLS
378 set_use_emutls=
379 if test "$enable_tls $gcc_cv_use_emutls" = "yes yes"; then
380   set_use_emutls="-DUSE_EMUTLS"
382 AC_SUBST(set_use_emutls)
384 AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [
385 AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,
386   [[void ip (void) __attribute__ ((constructor (1)));]])],
387   [libgcc_cv_init_priority=yes],[libgcc_cv_init_priority=no])])
388 if test $libgcc_cv_init_priority = yes; then
389   AC_DEFINE(HAVE_INIT_PRIORITY, 1,
390   [Define if the compiler supports init priority.])
393 # Conditionalize the sfp-machine.h header for this target machine.
394 if test -z "${sfp_machine_header}"; then
395         sfp_machine_header=$cpu_type/sfp-machine.h
396         if test -f ${srcdir}/config/${sfp_machine_header}; then
397                 :
398         else
399                 sfp_machine_header=no-sfp-machine.h
400         fi
402 AC_SUBST(sfp_machine_header)
404 # Conditionalize the makefile for this target machine.
405 tmake_file_=
406 for f in ${tmake_file}
408         if test -f ${srcdir}/config/$f
409         then
410                 tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
411         fi
412 done
413 tmake_file="${tmake_file_}"
414 AC_SUBST(tmake_file)
416 # Likewise export definitions for libgcc_tm.h
417 tm_file_=
418 for f in ${tm_file}
420         tm_file_="${tm_file_} \$(srcdir)/config/$f"
421 done
422 tm_file="${tm_file_}"
423 AC_SUBST(tm_file)
424 AC_SUBST(tm_defines)
426 # Map from thread model to thread header.
427 GCC_AC_THREAD_HEADER([$target_thread_file])
429 # Substitute configuration variables
430 AC_SUBST(cpu_type)
431 AC_SUBST(extra_parts)
432 AC_SUBST(asm_hidden_op)
433 AC_CONFIG_LINKS([enable-execute-stack.c:$enable_execute_stack])
434 AC_CONFIG_LINKS([unwind.h:$unwind_header])
435 AC_CONFIG_LINKS([md-unwind-support.h:config/$md_unwind_header])
436 AC_CONFIG_LINKS([sfp-machine.h:config/$sfp_machine_header])
437 AC_CONFIG_LINKS([gthr-default.h:$thread_header])
439 # We need multilib support.
440 AC_CONFIG_FILES([Makefile])
441 AC_CONFIG_COMMANDS([default],
442   [[test -z "$CONFIG_HEADERS" || echo timestamp > stamp-h
443 if test -n "$CONFIG_FILES"; then
444   # FIXME: We shouldn't need to set ac_file
445   ac_file=Makefile
446   . ${libgcc_topdir}/config-ml.in
447 fi]],
448 [[srcdir=${srcdir}
449 host=${host}
450 with_target_subdir=${with_target_subdir}
451 with_multisubdir=${with_multisubdir}
452 ac_configure_args="--enable-multilib ${ac_configure_args}"
453 CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
454 libgcc_topdir=${libgcc_topdir}
455 CC="${CC}"
457 AC_OUTPUT