1# configure.ac -- Go library configure script.
2
3# Copyright 2009 The Go Authors. All rights reserved.
4# Use of this source code is governed by a BSD-style
5# license that can be found in the LICENSE file.
6
7# Process this file with autoreconf to produce configure.
8
9AC_PREREQ(2.64)
10AC_INIT(package-unused, version-unused,, libgo)
11AC_CONFIG_SRCDIR(Makefile.am)
12AC_CONFIG_HEADER(config.h)
13
14libtool_VERSION=4:0:0
15AC_SUBST(libtool_VERSION)
16
17AM_ENABLE_MULTILIB(, ..)
18
19AC_CANONICAL_SYSTEM
20target_alias=${target_alias-$host_alias}
21
22AM_INIT_AUTOMAKE([1.9.3 no-define foreign no-dist -Wall -Wno-portability])
23AH_TEMPLATE(PACKAGE, [Name of package])
24AH_TEMPLATE(VERSION, [Version number of package])
25
26m4_rename([_AC_ARG_VAR_PRECIOUS],[glibgo_PRECIOUS])
27m4_define([_AC_ARG_VAR_PRECIOUS],[])
28AC_PROG_CC
29AC_PROG_GO
30m4_rename_force([glibgo_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
31
32AC_SUBST(CFLAGS)
33
34AM_MAINTAINER_MODE
35
36AC_PROG_LD
37AC_PROG_RANLIB
38AC_CHECK_TOOL(OBJCOPY, objcopy, missing-objcopy)
39
40AC_LIBTOOL_DLOPEN
41AM_PROG_LIBTOOL
42AC_SUBST(enable_shared)
43AC_SUBST(enable_static)
44
45CC_FOR_BUILD=${CC_FOR_BUILD:-gcc}
46AC_SUBST(CC_FOR_BUILD)
47
48AC_PROG_AWK
49
50WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual'
51AC_SUBST(WARN_FLAGS)
52
53AC_ARG_ENABLE(werror, [AS_HELP_STRING([--enable-werror],
54                                      [turns on -Werror @<:@default=yes@:>@])])
55if test "x$enable_werror" != "xno"; then
56  WERROR="-Werror"
57fi
58AC_SUBST(WERROR)
59
60glibgo_toolexecdir=no
61glibgo_toolexeclibdir=no
62
63AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
64AC_ARG_ENABLE([version-specific-runtime-libs],
65  AC_HELP_STRING([--enable-version-specific-runtime-libs],
66                 [Specify that runtime libraries should be installed in a compiler-specific directory]),
67  [case "$enableval" in
68    yes) version_specific_libs=yes ;;
69    no)  version_specific_libs=no ;;
70    *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
71   esac],
72  [version_specific_libs=no])
73AC_MSG_RESULT($version_specific_libs)
74
75# Version-specific runtime libs processing.
76if test $version_specific_libs = yes; then
77  glibgo_toolexecdir='${libdir}/gcc/${host_alias}'
78  glibgo_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
79fi
80
81# Calculate glibgo_toolexecdir, glibgo_toolexeclibdir
82# Install a library built with a cross compiler in tooldir, not libdir.
83if test -n "$with_cross_host" &&
84   test x"$with_cross_host" != x"no"; then
85  nover_glibgo_toolexecdir='${exec_prefix}/${host_alias}'
86  nover_glibgo_toolexeclibdir='${toolexecdir}/lib'
87else
88  nover_glibgo_toolexecdir='${libdir}/gcc/${host_alias}'
89  nover_glibgo_toolexeclibdir='${libdir}'
90fi
91multi_os_directory=`$CC -print-multi-os-directory`
92case $multi_os_directory in
93  .) ;; # Avoid trailing /.
94  *) nover_glibgo_toolexeclibdir=${nover_glibgo_toolexeclibdir}/${multi_os_directory} ;;
95esac
96
97if test x"$glibgo_toolexecdir" = x"no"; then
98  glibgo_toolexecdir="${nover_glibgo_toolexecdir}"
99  glibgo_toolexeclibdir="${nover_glibgo_toolexeclibdir}"
100fi
101
102AC_SUBST(glibgo_toolexecdir)
103AC_SUBST(glibgo_toolexeclibdir)
104AC_SUBST(nover_glibgo_toolexeclibdir)
105
106# See if the user wants to configure without libffi.  Some
107# architectures don't support it.  FIXME: We should set a default
108# based on the host.
109AC_ARG_WITH(libffi,
110  AS_HELP_STRING([--without-libffi],
111                 [don't use libffi]),
112  [:],
113  [with_libffi=${with_libffi_default-yes}])
114
115LIBFFI=
116LIBFFIINCS=
117if test "$with_libffi" != no; then
118   AC_DEFINE(USE_LIBFFI, 1, [Define if we're to use libffi.])
119   LIBFFI=../libffi/libffi_convenience.la
120   LIBFFIINCS='-I$(top_srcdir)/../libffi/include -I../libffi/include'
121fi
122AC_SUBST(LIBFFI)
123AC_SUBST(LIBFFIINCS)
124
125# Used to tell GNU make to include a file without telling automake to
126# include it.
127go_include="-include"
128AC_SUBST(go_include)
129
130is_darwin=no
131is_freebsd=no
132is_irix=no
133is_linux=no
134is_netbsd=no
135is_openbsd=no
136is_rtems=no
137is_solaris=no
138GOOS=unknown
139case ${host} in
140  *-*-darwin*)   is_darwin=yes;  GOOS=darwin ;;
141  *-*-freebsd*)  is_freebsd=yes; GOOS=freebsd ;;
142  *-*-irix6*)    is_irix=yes;    GOOS=irix ;;
143  *-*-linux*)    is_linux=yes;   GOOS=linux ;;
144  *-*-netbsd*)	 is_netbsd=yes;  GOOS=netbsd ;;
145  *-*-openbsd*)  is_openbsd=yes; GOOS=openbsd ;;
146  *-*-rtems*)    is_rtems=yes;   GOOS=rtems ;;
147  *-*-solaris2*) is_solaris=yes; GOOS=solaris ;;
148esac
149AM_CONDITIONAL(LIBGO_IS_DARWIN, test $is_darwin = yes)
150AM_CONDITIONAL(LIBGO_IS_FREEBSD, test $is_freebsd = yes)
151AM_CONDITIONAL(LIBGO_IS_IRIX, test $is_irix = yes)
152AM_CONDITIONAL(LIBGO_IS_LINUX, test $is_linux = yes)
153AM_CONDITIONAL(LIBGO_IS_NETBSD, test $is_netbsd = yes)
154AM_CONDITIONAL(LIBGO_IS_OPENBSD, test $is_openbsd = yes)
155AM_CONDITIONAL(LIBGO_IS_RTEMS, test $is_rtems = yes)
156AM_CONDITIONAL(LIBGO_IS_SOLARIS, test $is_solaris = yes)
157AC_SUBST(GOOS)
158
159dnl Test whether we need to use DejaGNU or whether we can use the
160dnl simpler gotest approach.  We can only use gotest for a native
161dnl build.
162USE_DEJAGNU=no
163case ${host} in
164  *-*-rtems*) USE_DEJAGNU=yes ;;
165  ${build}) ;;
166  *) USE_DEJAGNU=yes ;;
167esac
168AC_SUBST(USE_DEJAGNU)
169
170dnl N.B. Keep in sync with gcc/testsuite/go.test/go-test.exp (go-set-goarch).
171is_386=no
172is_alpha=no
173is_arm=no
174is_m68k=no
175mips_abi=unknown
176is_ppc=no
177is_ppc64=no
178is_sparc=no
179is_sparc64=no
180is_x86_64=no
181GOARCH=unknown
182case ${host} in
183  alpha*-*-*)
184    is_alpha=yes
185    GOARCH=alpha
186    ;;
187  arm*-*-* | strongarm*-*-* | ep9312*-*-* | xscale-*-*)
188    is_arm=yes
189    GOARCH=arm
190    ;;
191changequote(,)dnl
192  i[34567]86-*-* | x86_64-*-*)
193changequote([,])dnl
194    AC_COMPILE_IFELSE([
195#ifdef __x86_64__
196#error 64-bit
197#endif],
198[is_386=yes], [is_x86_64=yes])
199    if test "$is_386" = "yes"; then
200      GOARCH=386
201    else
202      GOARCH=amd64
203    fi
204    ;;
205  m68k*-*-*)
206    is_m68k=yes
207    GOARCH=m68k
208    ;;
209  mips*-*-*)
210    AC_COMPILE_IFELSE([
211#if _MIPS_SIM != _ABIO32
212#error not o32
213#endif],
214[mips_abi="o32"],
215	[AC_COMPILE_IFELSE([
216#if _MIPS_SIM != _ABIN32
217#error not n32
218#endif],
219[mips_abi="n32"],
220	[AC_COMPILE_IFELSE([
221#if _MIPS_SIM != _ABI64
222#error not n64
223#endif],
224[mips_abi="n64"],
225	[AC_COMPILE_IFELSE([
226#if _MIPS_SIM != _ABIO64
227#error not o64
228#endif],
229[mips_abi="o64"],
230	[AC_MSG_ERROR([unknown MIPS ABI])
231[mips_abi="n32"]])])])])
232    case "$mips_abi" in
233    "o32") GOARCH=mipso32 ;;
234    "n32") GOARCH=mipsn32 ;;
235    "n64") GOARCH=mipsn64 ;;
236    "o64") GOARCH=mipso64 ;;
237    esac
238    ;;
239  rs6000*-*-* | powerpc*-*-*)
240    AC_COMPILE_IFELSE([
241#ifdef _ARCH_PPC64
242#error 64-bit
243#endif],
244[is_ppc=yes], [is_ppc64=yes])
245    if test "$is_ppc" = "yes"; then
246      GOARCH=ppc
247    else
248      GOARCH=ppc64
249    fi
250    ;;
251  sparc*-*-*)
252    AC_COMPILE_IFELSE([
253#if defined(__sparcv9) || defined(__arch64__)
254#error 64-bit
255#endif],
256[is_sparc=yes], [is_sparc64=yes])
257    if test "$is_sparc" = "yes"; then
258      GOARCH=sparc
259    else
260      GOARCH=sparc64
261    fi
262    ;;
263esac
264AM_CONDITIONAL(LIBGO_IS_386, test $is_386 = yes)
265AM_CONDITIONAL(LIBGO_IS_ALPHA, test $is_alpha = yes)
266AM_CONDITIONAL(LIBGO_IS_ARM, test $is_arm = yes)
267AM_CONDITIONAL(LIBGO_IS_M68K, test $is_m68k = yes)
268AM_CONDITIONAL(LIBGO_IS_MIPS, test $mips_abi != unknown)
269AM_CONDITIONAL(LIBGO_IS_MIPSO32, test $mips_abi = o32)
270AM_CONDITIONAL(LIBGO_IS_MIPSN32, test $mips_abi = n32)
271AM_CONDITIONAL(LIBGO_IS_MIPSN64, test $mips_abi = n64)
272AM_CONDITIONAL(LIBGO_IS_MIPSO64, test $mips_abi = o64)
273AM_CONDITIONAL(LIBGO_IS_PPC, test $is_ppc = yes)
274AM_CONDITIONAL(LIBGO_IS_PPC64, test $is_ppc64 = yes)
275AM_CONDITIONAL(LIBGO_IS_SPARC, test $is_sparc = yes)
276AM_CONDITIONAL(LIBGO_IS_SPARC64, test $is_sparc64 = yes)
277AM_CONDITIONAL(LIBGO_IS_X86_64, test $is_x86_64 = yes)
278AC_SUBST(GOARCH)
279
280dnl Some files are only present when needed for specific architectures.
281GO_LIBCALL_OS_FILE=
282GO_LIBCALL_OS_ARCH_FILE=
283GO_SYSCALL_OS_FILE=
284GO_SYSCALL_OS_ARCH_FILE=
285if test -f ${srcdir}/go/syscall/libcall_${GOOS}.go; then
286  GO_LIBCALL_OS_FILE=go/syscall/libcall_${GOOS}.go
287fi
288if test -f ${srcdir}/go/syscall/libcall_${GOOS}_${GOARCH}.go; then
289  GO_LIBCALL_OS_ARCH_FILE=go/syscall/libcall_${GOOS}_${GOARCH}.go
290fi
291if test -f ${srcdir}/go/syscall/syscall_${GOOS}.go; then
292  GO_SYSCALL_OS_FILE=go/syscall/syscall_${GOOS}.go
293fi
294if test -f ${srcdir}/go/syscall/syscall_${GOOS}_${GOARCH}.go; then
295  GO_SYSCALL_OS_ARCH_FILE=go/syscall/syscall_${GOOS}_${GOARCH}.go
296fi
297AC_SUBST(GO_LIBCALL_OS_FILE)
298AC_SUBST(GO_LIBCALL_OS_ARCH_FILE)
299AC_SUBST(GO_SYSCALL_OS_FILE)
300AC_SUBST(GO_SYSCALL_OS_ARCH_FILE)
301
302dnl Special flags used to generate sysinfo.go.
303OSCFLAGS="-D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64"
304case "$target" in
305    mips-sgi-irix6.5*)
306	# IRIX 6 needs _XOPEN_SOURCE=500 for the XPG5 version of struct
307	# msghdr in <sys/socket.h>.
308	OSCFLAGS="$OSCFLAGS -D_XOPEN_SOURCE=500"
309	;;
310    *-*-solaris2.[[89]])
311	# Solaris 8/9 need this so struct msghdr gets the msg_control
312	# etc. fields in <sys/socket.h> (_XPG4_2).
313	OSCFLAGS="$OSCFLAGS -D_XOPEN_SOURCE=500 -D_XOPEN_SOURCE_EXTENDED -D__EXTENSIONS__"
314	;;
315    *-*-solaris2.1[[01]])
316	# Solaris 10+ needs this so struct msghdr gets the msg_control
317	# etc. fields in <sys/socket.h> (_XPG4_2).  _XOPEN_SOURCE=600 as
318	# above doesn't work with C99.
319	OSCFLAGS="$OSCFLAGS -std=gnu99 -D_XOPEN_SOURCE=600 -D__EXTENSIONS__"
320	;;
321esac
322AC_SUBST(OSCFLAGS)
323
324dnl Use -fsplit-stack when compiling C code if available.
325AC_CACHE_CHECK([whether -fsplit-stack is supported],
326[libgo_cv_c_split_stack_supported],
327[CFLAGS_hold=$CFLAGS
328CFLAGS="$CFLAGS -fsplit-stack"
329AC_COMPILE_IFELSE([[int i;]],
330[libgo_cv_c_split_stack_supported=yes],
331[libgo_cv_c_split_stack_supported=no])
332CFLAGS=$CFLAGS_hold])
333if test "$libgo_cv_c_split_stack_supported" = yes; then
334  SPLIT_STACK=-fsplit-stack
335  AC_DEFINE(USING_SPLIT_STACK, 1,
336		[Define if the compiler supports -fsplit-stack])
337else
338  SPLIT_STACK=
339fi
340AC_SUBST(SPLIT_STACK)
341AM_CONDITIONAL(USING_SPLIT_STACK,
342	test "$libgo_cv_c_split_stack_supported" = yes)
343
344dnl Check whether the linker does stack munging when calling from
345dnl split-stack into non-split-stack code.  We check this by looking
346dnl at the --help output.  FIXME: This is only half right: it's
347dnl possible for the linker to support this for some targets but not
348dnl others.
349AC_CACHE_CHECK([whether linker supports split stack],
350[libgo_cv_c_linker_supports_split_stack],
351libgo_cv_c_linker_supports_split_stack=no
352if $LD --help 2>/dev/null | grep split-stack-adjust-size >/dev/null 2>&1; then
353  libgo_cv_c_linker_supports_split_stack=yes
354fi)
355if test "$libgo_cv_c_linker_supports_split_stack" = yes; then
356  AC_DEFINE(LINKER_SUPPORTS_SPLIT_STACK, 1,
357	    [Define if the linker support split stack adjustments])
358fi
359
360dnl Test for the -lm library.
361MATH_LIBS=
362AC_CHECK_LIB([m], [sqrt], MATH_LIBS=-lm)
363AC_SUBST(MATH_LIBS)
364
365dnl Test for -lsocket and -lnsl.  Copied from libjava/configure.ac.
366AC_CACHE_CHECK([for socket libraries], libgo_cv_lib_sockets,
367  [libgo_cv_lib_sockets=
368   libgo_check_both=no
369   AC_CHECK_FUNC(connect, libgo_check_socket=no, libgo_check_socket=yes)
370   if test "$libgo_check_socket" = "yes"; then
371     unset ac_cv_func_connect
372     AC_CHECK_LIB(socket, main, libgo_cv_lib_sockets="-lsocket",
373     		  libgo_check_both=yes)
374   fi
375   if test "$libgo_check_both" = "yes"; then
376     libgo_old_libs=$LIBS
377     LIBS="$LIBS -lsocket -lnsl"
378     unset ac_cv_func_accept
379     AC_CHECK_FUNC(accept,
380		   [libgo_check_nsl=no
381		    libgo_cv_lib_sockets="-lsocket -lnsl"])
382     unset ac_cv_func_accept
383     LIBS=$libgo_old_libs
384   fi
385   unset ac_cv_func_gethostbyname
386   libgo_old_libs="$LIBS"
387   AC_CHECK_FUNC(gethostbyname, ,
388		 [AC_CHECK_LIB(nsl, main,
389		 	[libgo_cv_lib_sockets="$libgo_cv_lib_sockets -lnsl"])])
390   unset ac_cv_func_gethostbyname
391   LIBS=$libgo_old_libs
392])
393NET_LIBS="$libgo_cv_lib_sockets"
394AC_SUBST(NET_LIBS)
395
396dnl Test whether the compiler supports the -pthread option.
397AC_CACHE_CHECK([whether -pthread is supported],
398[libgo_cv_lib_pthread],
399[CFLAGS_hold=$CFLAGS
400CFLAGS="$CFLAGS -pthread"
401AC_COMPILE_IFELSE([[int i;]],
402[libgo_cv_lib_pthread=yes],
403[libgo_cv_lib_pthread=no])
404CFLAGS=$CFLAGS_hold])
405PTHREAD_CFLAGS=
406if test "$libgo_cv_lib_pthread" = yes; then
407  PTHREAD_CFLAGS=-pthread
408fi
409AC_SUBST(PTHREAD_CFLAGS)
410
411dnl Test for the -lpthread library.
412PTHREAD_LIBS=
413AC_CHECK_LIB([pthread], [pthread_create], PTHREAD_LIBS=-lpthread)
414AC_SUBST(PTHREAD_LIBS)
415
416dnl Test if -lrt is required for sched_yield and/or nanosleep.
417AC_SEARCH_LIBS([sched_yield], [rt])
418AC_SEARCH_LIBS([nanosleep], [rt])
419
420AC_C_BIGENDIAN
421
422GCC_CHECK_UNWIND_GETIPINFO
423
424AC_ARG_ENABLE(sjlj-exceptions,
425  AC_HELP_STRING([--enable-sjlj-exceptions],
426		 [force use of builtin_setjmp for exceptions]),
427  [case "$enableval" in
428   yes|no|auto) ;;
429   *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
430   esac],
431  [enable_sjlj_exceptions=auto])
432
433AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
434[libgo_cv_lib_sjlj_exceptions],
435[AC_LANG_CONFTEST(
436  [AC_LANG_SOURCE([
437void bar ();
438void clean (int *);
439void foo ()
440{
441  int i __attribute__ ((cleanup (clean)));
442  bar();
443}
444])])
445CFLAGS_hold=$CFLAGS
446CFLAGS="--save-temps -fexceptions"
447libgo_cv_lib_sjlj_exceptions=unknown
448AS_IF([ac_fn_c_try_compile],
449  [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
450    libgo_cv_lib_sjlj_exceptions=yes
451  elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
452    libgo_cv_lib_sjlj_exceptions=no
453  fi])
454CFLAGS=$CFLAGS_hold
455rm -f conftest*
456])
457
458if test "$enable_sjlj_exceptions" = "auto"; then
459  enable_sjlj_exceptions=$libgo_cv_lib_sjlj_exceptions
460fi
461
462case $enable_sjlj_exceptions in
463yes)
464  AC_DEFINE(LIBGO_SJLJ_EXCEPTIONS, 1,
465	[Define if the C++ compiler is configured for setjmp/longjmp exceptions.])
466  ;;
467no)
468  ;;
469*)
470  AC_MSG_ERROR([unable to detect exception model])
471  ;;
472esac
473
474AC_CHECK_HEADERS(sys/file.h sys/mman.h syscall.h sys/epoll.h sys/inotify.h sys/ptrace.h sys/syscall.h sys/user.h sys/utsname.h sys/select.h sys/socket.h net/if.h net/if_arp.h net/route.h netpacket/packet.h sys/prctl.h sys/mount.h sys/vfs.h sys/statfs.h sys/timex.h sys/sysinfo.h utime.h linux/ether.h linux/fs.h linux/reboot.h netinet/in_syst.h netinet/ip.h netinet/ip_mroute.h netinet/if_ether.h)
475
476AC_CHECK_HEADERS([linux/filter.h linux/if_addr.h linux/if_ether.h linux/if_tun.h linux/netlink.h linux/rtnetlink.h], [], [],
477[#ifdef HAVE_SYS_SOCKET_H
478#include <sys/socket.h>
479#endif
480])
481
482AC_CACHE_CHECK([whether <ustat.h> can be used],
483[libgo_cv_c_ustat_h],
484[CFLAGS_hold=$CFLAGS
485CFLAGS="$CFLAGS -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE $OSCFLAGS"
486AC_COMPILE_IFELSE(
487[AC_LANG_SOURCE([
488#include <sys/types.h>
489#ifdef HAVE_LINUX_FILTER_H
490#include <linux/filter.h>
491#endif
492#include <ustat.h>
493])], [libgo_cv_c_ustat_h=yes], [libgo_cv_c_ustat_h=no])
494CFLAGS=$CFLAGS_hold])
495if test $libgo_cv_c_ustat_h = yes; then
496  AC_DEFINE(HAVE_USTAT_H, 1,
497    [Define to 1 if you have the <ustat.h> header file and it works.])
498fi
499
500AM_CONDITIONAL(HAVE_SYS_MMAN_H, test "$ac_cv_header_sys_mman_h" = yes)
501
502AC_CHECK_FUNCS(strerror_r strsignal wait4 mincore setenv dl_iterate_phdr)
503AM_CONDITIONAL(HAVE_STRERROR_R, test "$ac_cv_func_strerror_r" = yes)
504AM_CONDITIONAL(HAVE_WAIT4, test "$ac_cv_func_wait4" = yes)
505
506AC_CHECK_FUNCS(accept4 dup3 epoll_create1 faccessat fallocate fchmodat fchownat futimesat getxattr inotify_add_watch inotify_init inotify_init1 inotify_rm_watch listxattr mkdirat mknodat openat pipe2 removexattr renameat setxattr sync_file_range splice tee unlinkat unshare utimensat)
507AC_TYPE_OFF_T
508AC_CHECK_TYPES([loff_t])
509
510LIBS_hold="$LIBS"
511LIBS="$LIBS -lm"
512AC_CHECK_FUNCS(cosl expl logl sinl tanl acosl asinl atanl atan2l expm1l ldexpl log10l log1pl)
513LIBS="$LIBS_hold"
514
515CFLAGS_hold="$CFLAGS"
516CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
517LIBS_hold="$LIBS"
518LIBS="$LIBS $PTHREAD_LIBS"
519AC_CHECK_FUNCS(sem_timedwait)
520CFLAGS="$CFLAGS_hold"
521LIBS="$LIBS_hold"
522
523LIBS_hold="$LIBS"
524LIBS="$LIBS $MATH_LIBS"
525AC_CHECK_FUNCS(matherr)
526LIBS="$LIBS_hold"
527
528AC_CACHE_CHECK([for __sync_bool_compare_and_swap_4],
529[libgo_cv_func___sync_bool_compare_and_swap_4],
530[AC_LINK_IFELSE([
531typedef unsigned int uint32  __attribute__ ((mode (SI)));
532uint32 i;
533int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
534],
535[libgo_cv_func___sync_bool_compare_and_swap_4=yes],
536[libgo_cv_func___sync_bool_compare_and_swap_4=no])])
537if test "$libgo_cv_func___sync_bool_compare_and_swap_4" = "yes"; then
538  AC_DEFINE(HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4, 1,
539    [Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint32])
540fi
541
542AC_CACHE_CHECK([for __sync_bool_compare_and_swap_8],
543[libgo_cv_func___sync_bool_compare_and_swap_8],
544[AC_LINK_IFELSE([
545typedef unsigned int uint64  __attribute__ ((mode (DI)));
546uint64 i;
547int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
548],
549[libgo_cv_func___sync_bool_compare_and_swap_8=yes],
550[libgo_cv_func___sync_bool_compare_and_swap_8=no])])
551if test "$libgo_cv_func___sync_bool_compare_and_swap_8" = "yes"; then
552  AC_DEFINE(HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8, 1,
553    [Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint64])
554fi
555
556AC_CACHE_CHECK([for __sync_fetch_and_add_4],
557[libgo_cv_func___sync_fetch_and_add_4],
558[AC_LINK_IFELSE([
559typedef unsigned int uint32  __attribute__ ((mode (SI)));
560uint32 i;
561int main() { return __sync_fetch_and_add (&i, 1); }
562],
563[libgo_cv_func___sync_fetch_and_add_4=yes],
564[libgo_cv_func___sync_fetch_and_add_4=no])])
565if test "$libgo_cv_func___sync_fetch_and_add_4" = "yes"; then
566  AC_DEFINE(HAVE_SYNC_FETCH_AND_ADD_4, 1,
567    [Define to 1 if the compiler provides the __sync_fetch_and_add function for uint32])
568fi
569
570AC_CACHE_CHECK([for __sync_add_and_fetch_8],
571[libgo_cv_func___sync_add_and_fetch_8],
572[AC_LINK_IFELSE([
573typedef unsigned int uint64  __attribute__ ((mode (DI)));
574uint64 i;
575int main() { return __sync_add_and_fetch (&i, 1); }
576],
577[libgo_cv_func___sync_add_and_fetch_8=yes],
578[libgo_cv_func___sync_add_and_fetch_8=no])])
579if test "$libgo_cv_func___sync_add_and_fetch_8" = "yes"; then
580  AC_DEFINE(HAVE_SYNC_ADD_AND_FETCH_8, 1,
581    [Define to 1 if the compiler provides the __sync_add_and_fetch function for uint64])
582fi
583
584dnl For x86 we want to use the -minline-all-stringops option to avoid
585dnl forcing a stack split when calling memcpy and friends.
586AC_CACHE_CHECK([whether compiler supports -minline-all-stringops],
587[libgo_cv_c_stringops],
588[CFLAGS_hold=$CFLAGS
589CFLAGS="$CFLAGS -minline-all-stringops"
590AC_COMPILE_IFELSE([int i;],
591[libgo_cv_c_stringops=yes],
592[libgo_cv_c_stringops=no])
593CFLAGS=$CFLAGS_hold])
594STRINGOPS_FLAG=
595if test "$libgo_cv_c_stringops" = yes; then
596  STRINGOPS_FLAG=-minline-all-stringops
597fi
598AC_SUBST(STRINGOPS_FLAG)
599
600dnl For x86 we want to compile the math library with -mfancy-math-387
601dnl -funsafe-math-optimizations so that we can use the builtin
602dnl instructions directly.
603AC_CACHE_CHECK([whether compiler supports -mfancy-math-387],
604[libgo_cv_c_fancymath],
605[CFLAGS_hold=$CFLAGS
606CFLAGS="$CFLAGS -mfancy-math-387"
607AC_COMPILE_IFELSE([int i;],
608[libgo_cv_c_fancymath=yes],
609[libgo_cv_c_fancymath=no])
610CFLAGS=$CFLAGS_hold])
611MATH_FLAG=
612if test "$libgo_cv_c_fancymath" = yes; then
613  MATH_FLAG="-mfancy-math-387 -funsafe-math-optimizations"
614fi
615AC_SUBST(MATH_FLAG)
616
617CFLAGS_hold=$CFLAGS
618CFLAGS="$CFLAGS -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE"
619AC_CHECK_TYPES([off64_t])
620CFLAGS=$CFLAGS_hold
621
622dnl Work out the size of the epoll_events struct on GNU/Linux.
623AC_CACHE_CHECK([epoll_event size],
624[libgo_cv_c_epoll_event_size],
625[AC_COMPUTE_INT(libgo_cv_c_epoll_event_size,
626[sizeof (struct epoll_event)],
627[#include <sys/epoll.h>],
628[libgo_cv_c_epoll_event_size=0])])
629SIZEOF_STRUCT_EPOLL_EVENT=${libgo_cv_c_epoll_event_size}
630AC_SUBST(SIZEOF_STRUCT_EPOLL_EVENT)
631
632dnl Work out the offset of the fd field in the epoll_events struct on
633dnl GNU/Linux.
634AC_CACHE_CHECK([epoll_event data.fd offset],
635[libgo_cv_c_epoll_event_fd_offset],
636[AC_COMPUTE_INT(libgo_cv_c_epoll_event_fd_offset,
637[offsetof (struct epoll_event, data.fd)],
638[#include <stddef.h>
639#include <sys/epoll.h>],
640[libgo_cv_c_epoll_event_fd_offset=0])])
641STRUCT_EPOLL_EVENT_FD_OFFSET=${libgo_cv_c_epoll_event_fd_offset}
642AC_SUBST(STRUCT_EPOLL_EVENT_FD_OFFSET)
643
644dnl See if struct exception is defined in <math.h>.
645AC_CHECK_TYPE([struct exception],
646[libgo_has_struct_exception=yes],
647[libgo_has_struct_exception=no],
648[#include <math.h>])
649if test "$libgo_has_struct_exception" = "yes"; then
650  AC_DEFINE(HAVE_STRUCT_EXCEPTION, 1,
651            [Define to 1 if <math.h> defines struct exception])
652fi
653
654dnl Check if makecontext expects the uc_stack member of ucontext to point
655dnl to the top of the stack.
656case "$target" in
657  sparc*-*-solaris2.[[89]]*)
658    libgo_cv_lib_makecontext_stack_top=yes
659    ;;
660  *)
661    libgo_cv_lib_makecontext_stack_top=no
662    ;;
663esac
664if test "$libgo_cv_lib_makecontext_stack_top" = "yes"; then
665  AC_DEFINE(MAKECONTEXT_STACK_TOP, 1,
666	    [Define if makecontext expects top of stack in uc_stack.])
667fi
668
669dnl See whether setcontext changes the value of TLS variables.
670AC_CACHE_CHECK([whether setcontext clobbers TLS variables],
671[libgo_cv_lib_setcontext_clobbers_tls],
672[CFLAGS_hold="$CFLAGS"
673CFLAGS="$PTHREAD_CFLAGS"
674LIBS_hold="$LIBS"
675LIBS="$LIBS $PTHREAD_LIBS"
676AC_CHECK_SIZEOF([void *])
677AS_VAR_ARITH([ptr_type_size], [$ac_cv_sizeof_void_p \* 8])
678AC_RUN_IFELSE(
679  [AC_LANG_SOURCE([
680#include <pthread.h>
681#include <stdlib.h>
682#include <ucontext.h>
683#include <unistd.h>
684
685__thread int tls;
686
687static char stack[[10 * 1024 * 1024]];
688static ucontext_t c;
689
690/* Called via makecontext/setcontext.  */
691
692static void
693cfn (void)
694{
695  exit (tls);
696}
697
698/* Called via pthread_create.  */
699
700static void *
701tfn (void *dummy)
702{
703  /* The thread should still see this value after calling
704     setcontext.  */
705  tls = 0;
706
707  setcontext (&c);
708
709  /* The call to setcontext should not return.  */
710  abort ();
711}
712
713int
714main ()
715{
716  pthread_t tid;
717
718  /* The thread should not see this value.  */
719  tls = 1;
720
721  if (getcontext (&c) < 0)
722    abort ();
723
724  c.uc_stack.ss_sp = stack;
725#ifdef MAKECONTEXT_STACK_TOP
726  c.uc_stack.ss_sp += sizeof stack;
727#endif
728  c.uc_stack.ss_flags = 0;
729  c.uc_stack.ss_size = sizeof stack;
730  c.uc_link = NULL;
731  makecontext (&c, cfn, 0);
732
733  if (pthread_create (&tid, NULL, tfn, NULL) != 0)
734    abort ();
735
736  if (pthread_join (tid, NULL) != 0)
737    abort ();
738
739  /* The thread should have called exit.  */
740  abort ();
741}
742])],
743[libgo_cv_lib_setcontext_clobbers_tls=no],
744[libgo_cv_lib_setcontext_clobbers_tls=yes],
745[case "$target:$ptr_type_size" in
746  i?86-*-solaris2.1[[01]]:64 | x86_64*-*-solaris2.1[[01]]:64)
747    libgo_cv_lib_setcontext_clobbers_tls=yes ;;
748  *)
749    libgo_cv_lib_setcontext_clobbers_tls=no ;;
750 esac
751])
752CFLAGS="$CFLAGS_hold"
753LIBS="$LIBS_hold"
754])
755if test "$libgo_cv_lib_setcontext_clobbers_tls" = "yes"; then
756  AC_DEFINE(SETCONTEXT_CLOBBERS_TLS, 1,
757	    [Define if setcontext clobbers TLS variables])
758fi
759
760AC_CACHE_CHECK([whether .eh_frame section should be read-only],
761libgo_cv_ro_eh_frame, [
762libgo_cv_ro_eh_frame=no
763echo 'extern void foo (void); void bar (void) { foo (); foo (); }' > conftest.c
764if $CC $CFLAGS -S -fpic -fexceptions -o conftest.s conftest.c > /dev/null 2>&1; then
765  if grep '.section.*eh_frame.*"a"' conftest.s > /dev/null; then
766    libgo_cv_ro_eh_frame=yes
767  elif grep '.section.*eh_frame.*#alloc' conftest.c \
768       | grep -v '#write' > /dev/null; then
769    libgo_cv_ro_eh_frame=yes
770  fi
771fi
772rm -f conftest.*
773])
774if test "x$libgo_cv_ro_eh_frame" = xyes; then
775  AC_DEFINE(EH_FRAME_FLAGS, "a",
776	    [Define to the flags needed for the .section .eh_frame directive.])
777else
778  AC_DEFINE(EH_FRAME_FLAGS, "aw",
779	    [Define to the flags needed for the .section .eh_frame directive.])
780fi
781
782AC_CACHE_CHECK([if assembler supports GNU comdat group syntax],
783libgo_cv_as_comdat_gnu, [
784echo '.section .text,"axG",@progbits,.foo,comdat' > conftest.s
785if $CC $CFLAGS -c conftest.s > /dev/null 2>&1; then
786  libgo_cv_as_comdat_gnu=yes
787else
788  libgo_cv_as_comdat_gnu=no
789fi
790])
791if test "x$libgo_cv_as_comdat_gnu" = xyes; then
792  AC_DEFINE(HAVE_AS_COMDAT_GAS, 1,
793	    [Define if your assembler supports GNU comdat group syntax.])
794fi
795
796AC_CACHE_CHECK([assembler supports pc related relocs],
797libgo_cv_as_x86_pcrel, [
798libgo_cv_as_x86_pcrel=yes
799echo '.text; foo: nop; .data; .long foo-.; .text' > conftest.s
800if $CC $CFLAGS -c conftest.s 2>&1 | $EGREP -i 'illegal|warning' > /dev/null; then
801    libgo_cv_as_x86_pcrel=no
802fi
803])
804if test "x$libgo_cv_as_x86_pcrel" = xyes; then
805  AC_DEFINE(HAVE_AS_X86_PCREL, 1,
806	    [Define if your assembler supports PC relative relocs.])
807fi
808
809AC_CACHE_CHECK([assembler supports unwind section type],
810libgo_cv_as_x86_64_unwind_section_type, [
811libgo_cv_as_x86_64_unwind_section_type=yes
812echo '.section .eh_frame,"a",@unwind' > conftest.s
813if $CC $CFLAGS -c conftest.s 2>&1 | grep -i warning > /dev/null; then
814    libgo_cv_as_x86_64_unwind_section_type=no
815fi
816])
817if test "x$libgo_cv_as_x86_64_unwind_section_type" = xyes; then
818  AC_DEFINE(HAVE_AS_X86_64_UNWIND_SECTION_TYPE, 1,
819	    [Define if your assembler supports unwind section type.])
820fi
821
822AC_CACHE_SAVE
823
824if test ${multilib} = yes; then
825  multilib_arg="--enable-multilib"
826else
827  multilib_arg=
828fi
829
830AC_CONFIG_FILES(Makefile testsuite/Makefile)
831
832AC_CONFIG_COMMANDS([default],
833[if test -n "$CONFIG_FILES"; then
834   # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
835   # that multilib installs will end up installed in the correct place.
836   # The testsuite needs it for multilib-aware ABI baseline files.
837   # To work around this not being passed down from config-ml.in ->
838   # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
839   # append it here.  Only modify Makefiles that have just been created.
840   #
841   # Also, get rid of this simulated-VPATH thing that automake does.
842   cat > vpsed << \_EOF
843s!`test -f '$<' || echo '$(srcdir)/'`!!
844_EOF
845   for i in $SUBDIRS; do
846    case $CONFIG_FILES in
847     *${i}/Makefile*)
848       #echo "Adding MULTISUBDIR to $i/Makefile"
849       sed -f vpsed $i/Makefile > tmp
850       grep '^MULTISUBDIR =' Makefile >> tmp
851       mv tmp $i/Makefile
852       ;;
853    esac
854   done
855   rm vpsed
856 fi
857],
858[
859# Variables needed in config.status (file generation) which aren't already
860# passed by autoconf.
861SUBDIRS="$SUBDIRS"
862])
863
864AC_OUTPUT
865