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syscall: Portability code for epoll_event on GNU/Linux.
[pf3gnuchains/gcc-fork.git] / libgo / configure.ac
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
9 AC_PREREQ(2.64)
10 AC_INIT(package-unused, version-unused,, libgo)
11 AC_CONFIG_SRCDIR(Makefile.am)
12 AC_CONFIG_HEADER(config.h)
13
14 libtool_VERSION=1:0:0
15 AC_SUBST(libtool_VERSION)
16
17 AM_ENABLE_MULTILIB(, ..)
18
19 AC_CANONICAL_SYSTEM
20 target_alias=${target_alias-$host_alias}
21
22 AM_INIT_AUTOMAKE([1.9.3 no-define foreign -Wall])
23 AH_TEMPLATE(PACKAGE, [Name of package])
24 AH_TEMPLATE(VERSION, [Version number of package])
25
26 m4_rename([_AC_ARG_VAR_PRECIOUS],[glibgo_PRECIOUS])
27 m4_define([_AC_ARG_VAR_PRECIOUS],[])
28 AC_PROG_CC
29 AC_PROG_GO
30 m4_rename_force([glibgo_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
31
32 AC_SUBST(CFLAGS)
33
34 AM_MAINTAINER_MODE
35
36 AC_PROG_LD
37 AC_PROG_RANLIB
38 AC_CHECK_TOOL(OBJCOPY, objcopy, missing-objcopy)
39
40 AC_LIBTOOL_DLOPEN
41 AM_PROG_LIBTOOL
42 AC_SUBST(enable_shared)
43 AC_SUBST(enable_static)
44
45 CC_FOR_BUILD=${CC_FOR_BUILD:-gcc}
46 AC_SUBST(CC_FOR_BUILD)
47
48 AC_PROG_AWK
49
50 WARN_FLAGS='-Wall -Wextra -Wwrite-strings -Wcast-qual'
51 AC_SUBST(WARN_FLAGS)
52
53 dnl FIXME: This should be controlled by --enable-maintainer-mode.
54 WERROR="-Werror"
55 AC_SUBST(WERROR)
56
57 glibgo_toolexecdir=no
58 glibgo_toolexeclibdir=no
59 glibgo_prefixdir=$prefix
60
61 AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
62 AC_ARG_ENABLE([version-specific-runtime-libs],
63   AC_HELP_STRING([--enable-version-specific-runtime-libs],
64                  [Specify that runtime libraries should be installed in a compiler-specific directory]),
65   [case "$enableval" in
66     yes) version_specific_libs=yes ;;
67     no)  version_specific_libs=no ;;
68     *)   AC_MSG_ERROR([Unknown argument to enable/disable version-specific libs]);;
69    esac],
70   [version_specific_libs=no])
71 AC_MSG_RESULT($version_specific_libs)
72
73 # Version-specific runtime libs processing.
74 if test $version_specific_libs = yes; then
75   glibgo_toolexecdir='${libdir}/gcc/${host_alias}'
76   glibgo_toolexeclibdir='${toolexecdir}/${gcc_version}$(MULTISUBDIR)'
77 fi
78
79 # Calculate glibgo_toolexecdir, glibgo_toolexeclibdir
80 # Install a library built with a cross compiler in tooldir, not libdir.
81 if test x"$glibgo_toolexecdir" = x"no"; then
82   if test -n "$with_cross_host" &&
83      test x"$with_cross_host" != x"no"; then
84     glibgo_toolexecdir='${exec_prefix}/${host_alias}'
85     glibgo_toolexeclibdir='${toolexecdir}/lib'
86   else
87     glibgo_toolexecdir='${libdir}/gcc/${host_alias}'
88     glibgo_toolexeclibdir='${libdir}'
89   fi
90   multi_os_directory=`$CC -print-multi-os-directory`
91   case $multi_os_directory in
92     .) ;; # Avoid trailing /.
93     *) glibgo_toolexeclibdir=$glibgo_toolexeclibdir/$multi_os_directory ;;
94   esac
95 fi
96
97 AC_SUBST(glibgo_prefixdir)
98 AC_SUBST(glibgo_toolexecdir)
99 AC_SUBST(glibgo_toolexeclibdir)
100
101 # See if the user wants to configure without libffi.  Some
102 # architectures don't support it.  FIXME: We should set a default
103 # based on the host.
104 AC_ARG_WITH(libffi,
105   AS_HELP_STRING([--without-libffi],
106                  [don't use libffi]),
107   [:],
108   [with_libffi=${with_libffi_default-yes}])
109
110 LIBFFI=
111 LIBFFIINCS=
112 if test "$with_libffi" != no; then
113    AC_DEFINE(USE_LIBFFI, 1, [Define if we're to use libffi.])
114    LIBFFI=../libffi/libffi_convenience.la
115    LIBFFIINCS='-I$(top_srcdir)/../libffi/include -I../libffi/include'
116 fi
117 AC_SUBST(LIBFFI)
118 AC_SUBST(LIBFFIINCS)
119
120 is_darwin=no
121 is_freebsd=no
122 is_irix=no
123 is_linux=no
124 is_rtems=no
125 is_solaris=no
126 GOOS=unknown
127 case ${host} in
128   *-*-darwin*)   is_darwin=yes;  GOOS=darwin ;;
129   *-*-freebsd*)  is_freebsd=yes; GOOS=freebsd ;;
130   *-*-irix6*)    is_irix=yes;    GOOS=irix ;;
131   *-*-linux*)    is_linux=yes;   GOOS=linux ;;
132   *-*-rtems*)    is_rtems=yes;   GOOS=rtems ;;
133   *-*-solaris2*) is_solaris=yes; GOOS=solaris ;;
134 esac
135 AM_CONDITIONAL(LIBGO_IS_DARWIN, test $is_darwin = yes)
136 AM_CONDITIONAL(LIBGO_IS_FREEBSD, test $is_freebsd = yes)
137 AM_CONDITIONAL(LIBGO_IS_IRIX, test $is_irix = yes)
138 AM_CONDITIONAL(LIBGO_IS_LINUX, test $is_linux = yes)
139 AM_CONDITIONAL(LIBGO_IS_RTEMS, test $is_rtems = yes)
140 AM_CONDITIONAL(LIBGO_IS_SOLARIS, test $is_solaris = yes)
141 AC_SUBST(GOOS)
142
143 dnl N.B. Keep in sync with gcc/testsuite/go.test/go-test.exp (go-set-goarch).
144 is_386=no
145 is_alpha=no
146 is_arm=no
147 is_m68k=no
148 mips_abi=unknown
149 is_ppc=no
150 is_ppc64=no
151 is_sparc=no
152 is_sparc64=no
153 is_x86_64=no
154 GOARCH=unknown
155 case ${host} in
156   alpha*-*-*)
157     is_alpha=yes
158     GOARCH=alpha
159     ;;
160   arm*-*-* | strongarm*-*-* | ep9312*-*-* | xscale-*-*)
161     is_arm=yes
162     GOARCH=arm
163     ;;
164 changequote(,)dnl
165   i[34567]86-*-* | x86_64-*-*)
166 changequote([,])dnl
167     AC_COMPILE_IFELSE([
168 #ifdef __x86_64__
169 #error 64-bit
170 #endif],
171 [is_386=yes], [is_x86_64=yes])
172     if test "$is_386" = "yes"; then
173       GOARCH=386
174     else
175       GOARCH=amd64
176     fi
177     ;;
178   m68k*-*-*)
179     is_m68k=yes
180     GOARCH=m68k
181     ;;
182   mips*-*-*)
183     AC_COMPILE_IFELSE([
184 #if _MIPS_SIM != _ABIO32
185 #error not o32
186 #endif],
187 [mips_abi="o32"],
188         [AC_COMPILE_IFELSE([
189 #if _MIPS_SIM != _ABIN32
190 #error not n32
191 #endif],
192 [mips_abi="n32"],
193         [AC_COMPILE_IFELSE([
194 #if _MIPS_SIM != _ABI64
195 #error not n64
196 #endif],
197 [mips_abi="n64"],
198         [AC_COMPILE_IFELSE([
199 #if _MIPS_SIM != _ABIO64
200 #error not o64
201 #endif],
202 [mips_abi="o64"],
203         [AC_MSG_ERROR([unknown MIPS ABI])
204 [mips_abi="n32"]])])])])
205     case "$mips_abi" in
206     "o32") GOARCH=mipso32 ;;
207     "n32") GOARCH=mipsn32 ;;
208     "n64") GOARCH=mipsn64 ;;
209     "o64") GOARCH=mipso64 ;;
210     esac
211     ;;
212   rs6000*-*-* | powerpc*-*-*)
213     AC_COMPILE_IFELSE([
214 #ifdef _ARCH_PPC64
215 #error 64-bit
216 #endif],
217 [is_ppc=yes], [is_ppc64=yes])
218     if test "$is_ppc" = "yes"; then
219       GOARCH=ppc
220     else
221       GOARCH=ppc64
222     fi
223     ;;
224   sparc*-*-*)
225     AC_COMPILE_IFELSE([
226 #if defined(__sparcv9) || defined(__arch64__)
227 #error 64-bit
228 #endif],
229 [is_sparc=yes], [is_sparc64=yes])
230     if test "$is_sparc" = "yes"; then
231       GOARCH=sparc
232     else
233       GOARCH=sparc64
234     fi
235     ;;
236 esac
237 AM_CONDITIONAL(LIBGO_IS_386, test $is_386 = yes)
238 AM_CONDITIONAL(LIBGO_IS_ALPHA, test $is_alpha = yes)
239 AM_CONDITIONAL(LIBGO_IS_ARM, test $is_arm = yes)
240 AM_CONDITIONAL(LIBGO_IS_M68K, test $is_m68k = yes)
241 AM_CONDITIONAL(LIBGO_IS_MIPS, test $mips_abi != unknown)
242 AM_CONDITIONAL(LIBGO_IS_MIPSO32, test $mips_abi = o32)
243 AM_CONDITIONAL(LIBGO_IS_MIPSN32, test $mips_abi = n32)
244 AM_CONDITIONAL(LIBGO_IS_MIPSN64, test $mips_abi = n64)
245 AM_CONDITIONAL(LIBGO_IS_MIPSO64, test $mips_abi = o64)
246 AM_CONDITIONAL(LIBGO_IS_PPC, test $is_ppc = yes)
247 AM_CONDITIONAL(LIBGO_IS_PPC64, test $is_ppc64 = yes)
248 AM_CONDITIONAL(LIBGO_IS_SPARC, test $is_sparc = yes)
249 AM_CONDITIONAL(LIBGO_IS_SPARC64, test $is_sparc64 = yes)
250 AM_CONDITIONAL(LIBGO_IS_X86_64, test $is_x86_64 = yes)
251 AC_SUBST(GOARCH)
252
253 dnl Some files are only present when needed for specific architectures.
254 GO_LIBCALL_OS_FILE=
255 GO_LIBCALL_OS_ARCH_FILE=
256 GO_SYSCALL_OS_FILE=
257 GO_SYSCALL_OS_ARCH_FILE=
258 if test -f ${srcdir}/go/syscall/libcall_${GOOS}.go; then
259   GO_LIBCALL_OS_FILE=go/syscall/libcall_${GOOS}.go
260 fi
261 if test -f ${srcdir}/go/syscall/libcall_${GOOS}_${GOARCH}.go; then
262   GO_LIBCALL_OS_ARCH_FILE=go/syscall/libcall_${GOOS}_${GOARCH}.go
263 fi
264 if test -f ${srcdir}/go/syscall/syscall_${GOOS}.go; then
265   GO_SYSCALL_OS_FILE=go/syscall/syscall_${GOOS}.go
266 fi
267 if test -f ${srcdir}/go/syscall/syscall_${GOOS}_${GOARCH}.go; then
268   GO_SYSCALL_OS_ARCH_FILE=go/syscall/syscall_${GOOS}_${GOARCH}.go
269 fi
270 AC_SUBST(GO_LIBCALL_OS_FILE)
271 AC_SUBST(GO_LIBCALL_OS_ARCH_FILE)
272 AC_SUBST(GO_SYSCALL_OS_FILE)
273 AC_SUBST(GO_SYSCALL_OS_ARCH_FILE)
274
275 dnl Some targets need special flags to build sysinfo.go.
276 case "$target" in
277     mips-sgi-irix6.5*)
278         # IRIX 6 needs _XOPEN_SOURCE=500 for the XPG5 version of struct
279         # msghdr in <sys/socket.h>.
280         OSCFLAGS='-D_XOPEN_SOURCE=500'
281         ;;
282     *-*-solaris2.[[89]])
283         # Solaris 8/9 need this so struct msghdr gets the msg_control
284         # etc. fields in <sys/socket.h> (_XPG4_2).
285         OSCFLAGS='-D_XOPEN_SOURCE=500 -D_XOPEN_SOURCE_EXTENDED -D__EXTENSIONS__'
286         ;;
287     *-*-solaris2.1[[01]])
288         # Solaris 10+ needs this so struct msghdr gets the msg_control
289         # etc. fields in <sys/socket.h> (_XPG4_2).  _XOPEN_SOURCE=500 as
290         # above doesn't work with C99.
291         OSCFLAGS='-D_XOPEN_SOURCE=600 -D__EXTENSIONS__'
292         ;;
293 esac
294 AC_SUBST(OSCFLAGS)
295
296 dnl Use -fsplit-stack when compiling C code if available.
297 AC_CACHE_CHECK([whether -fsplit-stack is supported],
298 [libgo_cv_c_split_stack_supported],
299 [CFLAGS_hold=$CFLAGS
300 CFLAGS="$CFLAGS -fsplit-stack"
301 AC_COMPILE_IFELSE([[int i;]],
302 [libgo_cv_c_split_stack_supported=yes],
303 [libgo_cv_c_split_stack_supported=no])
304 CFLAGS=$CFLAGS_hold])
305 if test "$libgo_cv_c_split_stack_supported" = yes; then
306   SPLIT_STACK=-fsplit-stack
307   AC_DEFINE(USING_SPLIT_STACK, 1,
308                 [Define if the compiler supports -fsplit-stack])
309 else
310   SPLIT_STACK=
311 fi
312 AC_SUBST(SPLIT_STACK)
313 AM_CONDITIONAL(USING_SPLIT_STACK,
314         test "$libgo_cv_c_split_stack_supported" = yes)
315
316 dnl Check whether the linker does stack munging when calling from
317 dnl split-stack into non-split-stack code.  We check this by looking
318 dnl at the --help output.  FIXME: This is only half right: it's
319 dnl possible for the linker to support this for some targets but not
320 dnl others.
321 AC_CACHE_CHECK([whether linker supports split stack],
322 [libgo_cv_c_linker_supports_split_stack],
323 libgo_cv_c_linker_supports_split_stack=no
324 if $LD --help 2>/dev/null | grep split-stack-adjust-size >/dev/null 2>&1; then
325   libgo_cv_c_linker_supports_split_stack=yes
326 fi)
327 if test "$libgo_cv_c_linker_supports_split_stack" = yes; then
328   AC_DEFINE(LINKER_SUPPORTS_SPLIT_STACK, 1,
329             [Define if the linker support split stack adjustments])
330 fi
331
332 dnl Test for the -lm library.
333 MATH_LIBS=
334 AC_CHECK_LIB([m], [sqrt], MATH_LIBS=-lm)
335 AC_SUBST(MATH_LIBS)
336
337 dnl Test for -lsocket and -lnsl.  Copied from libjava/configure.ac.
338 AC_CACHE_CHECK([for socket libraries], libgo_cv_lib_sockets,
339   [libgo_cv_lib_sockets=
340    libgo_check_both=no
341    AC_CHECK_FUNC(connect, libgo_check_socket=no, libgo_check_socket=yes)
342    if test "$libgo_check_socket" = "yes"; then
343      unset ac_cv_func_connect
344      AC_CHECK_LIB(socket, main, libgo_cv_lib_sockets="-lsocket",
345                   libgo_check_both=yes)
346    fi
347    if test "$libgo_check_both" = "yes"; then
348      libgo_old_libs=$LIBS
349      LIBS="$LIBS -lsocket -lnsl"
350      unset ac_cv_func_accept
351      AC_CHECK_FUNC(accept,
352                    [libgo_check_nsl=no
353                     libgo_cv_lib_sockets="-lsocket -lnsl"])
354      unset ac_cv_func_accept
355      LIBS=$libgo_old_libs
356    fi
357    unset ac_cv_func_gethostbyname
358    libgo_old_libs="$LIBS"
359    AC_CHECK_FUNC(gethostbyname, ,
360                  [AC_CHECK_LIB(nsl, main,
361                         [libgo_cv_lib_sockets="$libgo_cv_lib_sockets -lnsl"])])
362    unset ac_cv_func_gethostbyname
363    LIBS=$libgo_old_libs
364 ])
365 NET_LIBS="$libgo_cv_lib_sockets"
366 AC_SUBST(NET_LIBS)
367
368 dnl Test whether the compiler supports the -pthread option.
369 AC_CACHE_CHECK([whether -pthread is supported],
370 [libgo_cv_lib_pthread],
371 [CFLAGS_hold=$CFLAGS
372 CFLAGS="$CFLAGS -pthread"
373 AC_COMPILE_IFELSE([[int i;]],
374 [libgo_cv_lib_pthread=yes],
375 [libgo_cv_lib_pthread=no])
376 CFLAGS=$CFLAGS_hold])
377 PTHREAD_CFLAGS=
378 if test "$libgo_cv_lib_pthread" = yes; then
379   PTHREAD_CFLAGS=-pthread
380 fi
381 AC_SUBST(PTHREAD_CFLAGS)
382
383 dnl Test for the -lpthread library.
384 PTHREAD_LIBS=
385 AC_CHECK_LIB([pthread], [pthread_create], PTHREAD_LIBS=-lpthread)
386 AC_SUBST(PTHREAD_LIBS)
387
388 dnl Test if -lrt is required for sched_yield.
389 AC_SEARCH_LIBS([sched_yield], [rt])
390
391 AC_C_BIGENDIAN
392
393 GCC_CHECK_UNWIND_GETIPINFO
394
395 AC_ARG_ENABLE(sjlj-exceptions,
396   AC_HELP_STRING([--enable-sjlj-exceptions],
397                  [force use of builtin_setjmp for exceptions]),
398   [case "$enableval" in
399    yes|no|auto) ;;
400    *) AC_MSG_ERROR([unknown argument to --enable-sjlj-exceptions]) ;;
401    esac],
402   [enable_sjlj_exceptions=auto])
403
404 AC_CACHE_CHECK([whether to use setjmp/longjmp exceptions],
405 [libgo_cv_lib_sjlj_exceptions],
406 [AC_LANG_CONFTEST(
407   [AC_LANG_SOURCE([
408 void bar ();
409 void clean (int *);
410 void foo ()
411 {
412   int i __attribute__ ((cleanup (clean)));
413   bar();
414 }
415 ])])
416 CFLAGS_hold=$CFLAGS
417 CFLAGS="--save-temps -fexceptions"
418 libgo_cv_lib_sjlj_exceptions=unknown
419 AS_IF([ac_fn_c_try_compile],
420   [if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1; then
421     libgo_cv_lib_sjlj_exceptions=yes
422   elif grep _Unwind_Resume conftest.s >/dev/null 2>&1; then
423     libgo_cv_lib_sjlj_exceptions=no
424   fi])
425 CFLAGS=$CFLAGS_hold
426 rm -f conftest*
427 ])
428
429 if test "$enable_sjlj_exceptions" = "auto"; then
430   enable_sjlj_exceptions=$libgo_cv_lib_sjlj_exceptions
431 fi
432
433 case $enable_sjlj_exceptions in
434 yes)
435   AC_DEFINE(LIBGO_SJLJ_EXCEPTIONS, 1,
436         [Define if the C++ compiler is configured for setjmp/longjmp exceptions.])
437   ;;
438 no)
439   ;;
440 *)
441   AC_MSG_ERROR([unable to detect exception model])
442   ;;
443 esac
444
445 AC_CHECK_HEADERS(sys/mman.h syscall.h sys/epoll.h sys/ptrace.h sys/syscall.h sys/user.h sys/utsname.h sys/select.h sys/socket.h net/if.h)
446
447 AC_CHECK_HEADERS([linux/filter.h linux/netlink.h linux/rtnetlink.h], [], [],
448 [#ifdef HAVE_SYS_SOCKET_H
449 #include <sys/socket.h>
450 #endif
451 ])
452
453 AM_CONDITIONAL(HAVE_SYS_MMAN_H, test "$ac_cv_header_sys_mman_h" = yes)
454
455 AC_CHECK_FUNCS(srandom random strerror_r strsignal wait4 mincore setenv)
456 AM_CONDITIONAL(HAVE_STRERROR_R, test "$ac_cv_func_strerror_r" = yes)
457 AM_CONDITIONAL(HAVE_WAIT4, test "$ac_cv_func_wait4" = yes)
458
459 AC_CACHE_CHECK([for __sync_bool_compare_and_swap_4],
460 [libgo_cv_func___sync_bool_compare_and_swap_4],
461 [AC_LINK_IFELSE([
462 typedef unsigned int uint32  __attribute__ ((mode (SI)));
463 uint32 i;
464 int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
465 ],
466 [libgo_cv_func___sync_bool_compare_and_swap_4=yes],
467 [libgo_cv_func___sync_bool_compare_and_swap_4=no])])
468 if test "$libgo_cv_func___sync_bool_compare_and_swap_4" = "yes"; then
469   AC_DEFINE(HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4, 1,
470     [Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint32])
471 fi
472
473 AC_CACHE_CHECK([for __sync_fetch_and_add_4],
474 [libgo_cv_func___sync_fetch_and_add_4],
475 [AC_LINK_IFELSE([
476 typedef unsigned int uint32  __attribute__ ((mode (SI)));
477 uint32 i;
478 int main() { return __sync_fetch_and_add (&i, 1); }
479 ],
480 [libgo_cv_func___sync_fetch_and_add_4=yes],
481 [libgo_cv_func___sync_fetch_and_add_4=no])])
482 if test "$libgo_cv_func___sync_fetch_and_add_4" = "yes"; then
483   AC_DEFINE(HAVE_SYNC_FETCH_AND_ADD_4, 1,
484     [Define to 1 if the compiler provides the __sync_fetch_and_add function for uint32])
485 fi
486
487 dnl For x86 we want to use the -minline-all-stringops option to avoid
488 dnl forcing a stack split when calling memcpy and friends.
489 AC_CACHE_CHECK([whether compiler supports -minline-all-stringops],
490 [libgo_cv_c_stringops],
491 [CFLAGS_hold=$CFLAGS
492 CFLAGS="$CFLAGS -minline-all-stringops"
493 AC_COMPILE_IFELSE([int i;],
494 [libgo_cv_c_stringops=yes],
495 [libgo_cv_c_stringops=no])
496 CFLAGS=$CFLAGS_hold])
497 STRINGOPS_FLAG=
498 if test "$libgo_cv_c_stringops" = yes; then
499   STRINGOPS_FLAG=-minline-all-stringops
500 fi
501 AC_SUBST(STRINGOPS_FLAG)
502
503 CFLAGS_hold=$CFLAGS
504 CFLAGS="$CFLAGS -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE"
505 AC_CHECK_TYPES(off64_t)
506 CFLAGS=$CFLAGS_hold
507
508 dnl Work out the size of the epoll_events struct on GNU/Linux.
509 AC_CACHE_CHECK([epoll_event size],
510 [libgo_cv_c_epoll_event_size],
511 [AC_COMPUTE_INT(libgo_cv_c_epoll_event_size,
512 [sizeof (struct epoll_event)],
513 [#include <sys/epoll.h>],
514 [libgo_cv_c_epoll_event_size=0])])
515 SIZEOF_STRUCT_EPOLL_EVENT=${libgo_cv_c_epoll_event_size}
516 AC_SUBST(SIZEOF_STRUCT_EPOLL_EVENT)
517
518 dnl Work out the offset of the fd field in the epoll_events struct on
519 dnl GNU/Linux.
520 AC_CACHE_CHECK([epoll_event data.fd offset],
521 [libgo_cv_c_epoll_event_fd_offset],
522 [AC_COMPUTE_INT(libgo_cv_c_epoll_event_fd_offset,
523 [offsetof (struct epoll_event, data.fd)],
524 [#include <stddef.h>
525 #include <sys/epoll.h>],
526 [libgo_cv_c_epoll_event_fd_offset=0])])
527 STRUCT_EPOLL_EVENT_FD_OFFSET=${libgo_cv_c_epoll_event_fd_offset}
528 AC_SUBST(STRUCT_EPOLL_EVENT_FD_OFFSET)
529
530 AC_CACHE_SAVE
531
532 if test ${multilib} = yes; then
533   multilib_arg="--enable-multilib"
534 else
535   multilib_arg=
536 fi
537
538 AC_CONFIG_FILES(Makefile testsuite/Makefile)
539
540 AC_CONFIG_COMMANDS([default],
541 [if test -n "$CONFIG_FILES"; then
542    # Multilibs need MULTISUBDIR defined correctly in certain makefiles so
543    # that multilib installs will end up installed in the correct place.
544    # The testsuite needs it for multilib-aware ABI baseline files.
545    # To work around this not being passed down from config-ml.in ->
546    # srcdir/Makefile.am -> srcdir/{src,libsupc++,...}/Makefile.am, manually
547    # append it here.  Only modify Makefiles that have just been created.
548    #
549    # Also, get rid of this simulated-VPATH thing that automake does.
550    cat > vpsed << \_EOF
551 s!`test -f '$<' || echo '$(srcdir)/'`!!
552 _EOF
553    for i in $SUBDIRS; do
554     case $CONFIG_FILES in
555      *${i}/Makefile*)
556        #echo "Adding MULTISUBDIR to $i/Makefile"
557        sed -f vpsed $i/Makefile > tmp
558        grep '^MULTISUBDIR =' Makefile >> tmp
559        mv tmp $i/Makefile
560        ;;
561     esac
562    done
563    rm vpsed
564  fi
565 ],
566 [
567 # Variables needed in config.status (file generation) which aren't already
568 # passed by autoconf.
569 SUBDIRS="$SUBDIRS"
570 ])
571
572 AC_OUTPUT