1 dnl Autoconf configuration for libsigsegv.
2 dnl Process this file with autoconf to produce a configure script.
4 dnl Copyright (C) 2002-2010 Bruno Haible <bruno@clisp.org>
6 dnl This program is free software; you can redistribute it and/or modify
7 dnl it under the terms of the GNU General Public License as published by
8 dnl the Free Software Foundation; either version 2, or (at your option)
11 dnl This program is distributed in the hope that it will be useful,
12 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
13 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 dnl GNU General Public License for more details.
16 dnl You should have received a copy of the GNU General Public License
17 dnl along with this program; if not, write to the Free Software Foundation,
18 dnl Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
22 AC_CONFIG_SRCDIR([src/sigsegv.h.in])
23 AC_CONFIG_AUX_DIR([build-aux])
27 { echo; echo "${term_bold}Build Tools:${term_norm}"; } >& AS_MESSAGE_FD
29 AM_INIT_AUTOMAKE(libsigsegv, 2.8)
30 AM_CONFIG_HEADER(config.h)
32 dnl Override automake's tar command used for creating distributions.
33 am__tar='${AMTAR} chf - --owner=root --group=root "$$tardir"'
41 dnl ========================== Determine PLATFORM ==========================
42 dnl Requires AC_CANONICAL_HOST.
43 dnl PLATFORM is a modified config.guess triple that is supposed to contain
44 dnl the bits of information which influence the configuration or functioning
45 dnl of catching faults.
47 AC_MSG_CHECKING([host platform])
49 changequote(,)dnl Autoconf 2.52 brokenness
52 kernelversion=`uname -r | sed -e 's/^\([0-9.]*\).*/\1/'`
53 sv_cv_host=`echo $sv_cv_host | sed -e "s/linux/linux$kernelversion/"`
56 changequote([,])dnl Autoconf 2.52 brokenness
57 cat > conftest.c << EOF
59 #ifdef __GNU_LIBRARY__
60 Version __GLIBC__ . __GLIBC_MINOR__
63 glibcversion=`$CPP $CPPFLAGS conftest.c 2>/dev/null | grep Version | sed -e 's/Version//' -e 's/ //g'`
64 if test -n "$glibcversion"; then
65 sv_cv_host="$sv_cv_host-glibc$glibcversion"
67 AC_MSG_RESULT([$sv_cv_host])
68 PLATFORM="$sv_cv_host"
71 dnl ========================== Done with PLATFORM ==========================
76 LT_INIT([disable-shared])
78 # For testing cross-compilation behaviour.
81 { echo; echo "${term_bold}Optional Platform Environment:${term_norm}"; } >& AS_MESSAGE_FD
83 dnl Headers to be included with <signal.h>. On MacOS X (Darwin) one also
84 dnl needs <sys/signal.h>.
85 AC_CHECK_HEADERS([sys/signal.h])
88 dnl ========================== Determine CFG_SIGNALS ==========================
89 dnl Requires AC_CANONICAL_HOST.
91 dnl List of signals that are sent when an invalid virtual memory address
92 dnl is accessed, or when the stack overflows.
94 sunos4* | freebsd* | dragonfly* | openbsd* | netbsd* | kfreebsd* | knetbsd*)
95 CFG_SIGNALS=signals-bsd.h ;;
97 CFG_SIGNALS=signals-hpux.h ;;
99 CFG_SIGNALS=signals-macos.h ;;
101 CFG_SIGNALS=signals-hurd.h ;;
103 CFG_SIGNALS=signals.h ;;
105 AC_DEFINE_UNQUOTED([CFG_SIGNALS], ["$CFG_SIGNALS"],
106 [The name of the include file describing the fault signals.])
108 dnl ========================== Done with CFG_SIGNALS ==========================
111 # How to determine the memory page size.
114 # How to allocate fresh memory using mmap.
115 # (We need mmap, because mprotect() doesn't work on malloc()ed memory on
120 dnl ================== Determine CFG_HANDLER partially, ==================
121 dnl ================== CFG_FAULT, CFG_MACHFAULT, ==================
122 dnl ================== FAULT_CONTEXT, FAULT_CONTEXT_INCLUDE ==================
123 dnl Requires AC_CANONICAL_HOST, SV_MMAP_ANON.
125 # How to write a SIGSEGV handler with access to the fault address.
127 # On MacOS X 10.2 or newer, we don't need these tests, because we'll end up
128 # using handler-macos.c anyway. If we were to perform the tests, 5 Crash Report
129 # dialog windows would pop up.
131 macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*) ;;
134 dnl FIXME: Put in some more known values into the third argument.
135 SV_TRY_FAULT([POSIX], sv_cv_fault_posix,
136 [*-*-solaris2.[7-9] | i?86-*-linux2.[4-9]* | i?86-*-freebsd[4-9]* | i?86-*-mirbsd1[0-9] | alpha*-dec-osf[4-9]* | *-*-hpux11* | mips-sgi-irix6*],
138 [int sig, siginfo_t *sip, void *ucp],
140 [action.sa_sigaction = &sigsegv_handler;
141 action.sa_flags = SA_SIGINFO;])
143 SV_TRY_FAULT([Linux/i386], sv_cv_fault_linux_i386, [i?86-*-linux2.[2-9]*],
144 [#include <asm/sigcontext.h>],
145 [int sig, struct sigcontext sc],
148 SV_TRY_FAULT([old Linux/i386], sv_cv_fault_linux_i386_old,
149 [i?86-*-linux2.[2-9]*],
151 [int sig, unsigned int more],
152 [((unsigned long *) &more) [21]])
154 dnl FIXME: Put in some more known values into the third argument.
155 SV_TRY_FAULT([Linux/m68k], sv_cv_fault_linux_m68k, [],
156 [#include <asm/sigcontext.h>
157 #include "$srcdir/src/fault-linux-m68k-old.c"],
158 [int sig, int code, struct sigcontext *scp],
159 [get_fault_addr (scp)])
161 dnl FIXME: Put in some more known values into the third argument.
162 SV_TRY_FAULT([Linux/PowerPC], sv_cv_fault_linux_powerpc, [],
163 [#include <asm/sigcontext.h>],
164 [int sig, struct sigcontext *scp],
167 dnl FIXME: Put in some more known values into the third argument.
168 SV_TRY_FAULT([Linux/HPPA], sv_cv_fault_linux_hppa, [],
170 [int sig, siginfo_t *sip, void *ucp],
172 [action.sa_sigaction = &sigsegv_handler;
173 action.sa_flags = SA_SIGINFO;])
175 dnl FIXME: Put in some more known values into the third argument.
176 SV_TRY_FAULT([BSD], sv_cv_fault_bsd, [i?86-*-freebsd[4-9]*],
178 [int sig, int code, struct sigcontext *scp, void *addr],
181 dnl FIXME: Put in some more known values into the third argument.
182 SV_TRY_FAULT([IRIX], sv_cv_fault_irix, [mips-sgi-irix6*],
184 [int sig, int code, struct sigcontext *scp],
185 [(unsigned long) scp->sc_badvaddr])
187 dnl FIXME: Put in some more known values into the third argument.
188 SV_TRY_FAULT([HP-UX HPPA], sv_cv_fault_hpux_hppa, [hppa*-*-hpux11*],
190 #define USE_64BIT_REGS(mc) \
191 (((mc).ss_flags & SS_WIDEREGS) && ((mc).ss_flags & SS_NARROWISINVALID))
192 #define GET_CR21(mc) \
193 (USE_64BIT_REGS(mc) ? (mc).ss_wide.ss_64.ss_cr21 : (mc).ss_narrow.ss_cr21)
195 [int sig, int code, struct sigcontext *scp],
196 [GET_CR21 (scp->sc_sl.sl_ss)])
198 dnl FIXME: Put in some more known values into the third argument.
199 SV_TRY_FAULT([OSF/1 Alpha], sv_cv_fault_osf_alpha,
200 [alpha*-*-osf[4-9]* | alpha*-*-linux2.[4-9]*],
202 [int sig, int code, struct sigcontext *scp],
203 [scp->sc_traparg_a0])
205 dnl FIXME: Put in some more known values into the third argument.
206 SV_TRY_FAULT([NetBSD Alpha], sv_cv_fault_netbsd_alpha,
207 [alpha*-*-osf[4-9]* | alpha-*-*bsd*],
208 [#include "$srcdir/src/fault-netbsd-alpha.c"],
209 [int sig, int code, struct sigcontext *scp],
210 [get_fault_addr (scp)])
212 dnl FIXME: Put in some more known values into the third argument.
213 SV_TRY_FAULT([AIX], sv_cv_fault_aix, [*-*-aix[34]*],
215 [int sig, int code, struct sigcontext *scp],
216 [scp->sc_jmpbuf.jmp_context.o_vaddr])
218 SV_TRY_FAULT([MacOSX/Darwin7 PowerPC], sv_cv_fault_macosdarwin7_ppc,
219 [powerpc-*-darwin7*],
220 [#include "$srcdir/src/fault-macosdarwin7-powerpc.c"],
221 [int sig, siginfo_t *sip, ucontext_t *ucp],
222 [get_fault_addr (sip, ucp)],
223 [action.sa_sigaction = &sigsegv_handler;
224 action.sa_flags = SA_SIGINFO;])
226 if test "$sv_cv_fault_macosdarwin7_ppc" != yes; then
227 SV_TRY_FAULT([MacOSX/Darwin5 PowerPC], sv_cv_fault_macosdarwin5_ppc,
228 [powerpc-*-darwin5*],
229 [#include "$srcdir/src/fault-macosdarwin5-powerpc.c"],
230 [int sig, int code, struct sigcontext *scp],
231 [get_fault_addr (scp)])
234 dnl FIXME: Put in some more known values into the third argument.
235 SV_TRY_FAULT([Hurd], sv_cv_fault_hurd, [],
237 [int sig, int code, struct sigcontext *scp],
240 # End of MacOS X special casing.
244 dnl Now determine the fault handler include file.
245 dnl We prefer the platform specific include files to the generic fault-posix.h
246 dnl because the former often defines SIGSEGV_FAULT_STACKPOINTER.
247 dnl Also we put the BSD test second-to-last, because the test may produce
253 FAULT_CONTEXT_INCLUDE=
255 dnl First the cases where the OS provides the fault address.
257 if test -z "$CFG_FAULT" && test "$sv_cv_fault_aix" = yes; then
259 powerpc* | rs6000) CFG_FAULT=fault-aix3-powerpc.h ;;
260 *) CFG_FAULT=fault-aix3.h ;;
262 FAULT_CONTEXT='struct sigcontext'
264 if test -z "$CFG_FAULT" && test "$sv_cv_fault_irix" = yes; then
266 mips*) CFG_FAULT=fault-irix-mips.h ;;
267 *) CFG_FAULT=fault-irix.h ;;
269 FAULT_CONTEXT='struct sigcontext'
271 if test -z "$CFG_FAULT" && test "$sv_cv_fault_hpux_hppa" = yes; then
273 hppa* | parisc*) CFG_FAULT=fault-hpux-hppa.h ;;
274 *) CFG_FAULT=fault-hpux.h ;;
276 FAULT_CONTEXT='struct sigcontext'
278 if test -z "$CFG_FAULT" && test "$sv_cv_fault_osf_alpha" = yes; then
280 alpha*) CFG_FAULT=fault-osf-alpha.h ;;
281 *) CFG_FAULT=fault-osf.h ;;
283 FAULT_CONTEXT='struct sigcontext'
285 if test -z "$CFG_FAULT" && test "$sv_cv_fault_netbsd_alpha" = yes; then
287 alpha*) CFG_FAULT=fault-netbsd-alpha.h ;;
289 FAULT_CONTEXT='struct sigcontext'
291 if test -z "$CFG_FAULT" && test "$sv_cv_fault_hurd" = yes; then
293 netbsd*) # A false positive.
296 CFG_FAULT=fault-hurd.h
297 FAULT_CONTEXT='struct sigcontext'
301 if test -z "$CFG_FAULT" && test "$sv_cv_fault_bsd" = yes; then
303 freebsd* | dragonfly* | kfreebsd*)
306 CFG_FAULT=fault-freebsd-i386.h
307 FAULT_CONTEXT='struct sigcontext'
310 CFG_FAULT=fault-bsd.h
316 CFG_FAULT=fault-bsd.h
321 if test -z "$CFG_FAULT" && test "$sv_cv_fault_posix" = yes; then
325 alpha*) CFG_FAULT=fault-openbsd-alpha.h ;;
326 arm* | strongarm* | xscale*) CFG_FAULT=fault-openbsd-arm.h ;;
327 hppa* | parisc*) CFG_FAULT=fault-openbsd-hppa.h ;;
328 i?86 | x86_64) CFG_FAULT=fault-openbsd-i386.h ;;
329 m68*) CFG_FAULT=fault-openbsd-m68k.h ;;
330 m88k*) CFG_FAULT=fault-openbsd-m88k.h ;;
331 mips*) CFG_FAULT=fault-openbsd-mips.h ;;
332 powerpc* | rs6000) CFG_FAULT=fault-openbsd-powerpc.h ;;
333 sh*) CFG_FAULT=fault-openbsd-sh.h ;;
334 sparc*) CFG_FAULT=fault-openbsd-sparc.h ;;
335 vax*) CFG_FAULT=fault-openbsd-vax.h ;;
336 *) CFG_FAULT=fault-openbsd.h ;;
338 FAULT_CONTEXT='struct sigcontext'
343 CFG_FAULT=fault-openbsd-i386.h
344 FAULT_CONTEXT='struct sigcontext'
351 CFG_FAULT=fault-linux-ia64-old.h
352 FAULT_CONTEXT='struct sigcontext'
357 if test -z "$CFG_FAULT"; then
358 dnl <ucontext.h> was required by POSIX:2001, and many systems have it. But
359 dnl POSIX:2008 does not require it any more, and MirBSD does not have it.
360 AC_CHECK_HEADERS([ucontext.h])
361 if test $ac_cv_header_ucontext_h = yes; then
365 i?86 | x86_64) CFG_FAULT=fault-solaris-i386.h ;;
366 sparc*) CFG_FAULT=fault-solaris-sparc.h ;;
367 *) CFG_FAULT=fault-solaris.h ;;
372 powerpc* | rs6000) CFG_FAULT=fault-aix5-powerpc.h ;;
373 *) CFG_FAULT=fault-aix5.h ;;
377 CFG_FAULT=fault-netbsd.h
382 CFG_FAULT=fault-linux-alpha.h
384 arm* | strongarm* | xscale*)
385 CFG_FAULT=fault-linux-arm.h
388 CFG_FAULT=fault-linux-cris.h
391 CFG_FAULT=fault-linux-hppa.h
394 CFG_FAULT=fault-linux-i386.h
397 CFG_FAULT=fault-linux-ia64.h
400 CFG_FAULT=fault-linux-m68k.h
403 CFG_FAULT=fault-linux-mips.h
406 CFG_FAULT=fault-linux-powerpc.h
409 CFG_FAULT=fault-linux-s390.h
412 CFG_FAULT=fault-linux-sh.h
415 CFG_FAULT=fault-linux-sparc.h
418 CFG_FAULT=fault-posix-ucontext.h
423 CFG_FAULT=fault-posix-ucontext.h
426 FAULT_CONTEXT='ucontext_t'
427 FAULT_CONTEXT_INCLUDE='#include <ucontext.h>'
429 CFG_FAULT=fault-posix.h
434 if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_i386" = yes; then
436 i?86 | x86_64) CFG_FAULT=fault-linux-i386-old.h ;;
438 FAULT_CONTEXT='struct sigcontext'
440 if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_i386_old" = yes; then
442 i?86 | x86_64) CFG_FAULT=fault-linux-i386-oldold.h ;;
444 FAULT_CONTEXT='struct sigcontext'
446 if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_powerpc" = yes; then
448 powerpc* | rs6000) CFG_FAULT=fault-linux-powerpc-old.h ;;
450 FAULT_CONTEXT='struct sigcontext'
452 if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_hppa" = yes; then
454 hppa* | parisc*) CFG_FAULT=fault-linux-hppa-old.h ;;
457 if test -z "$CFG_FAULT"; then
459 macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*)
461 powerpc* | rs6000 | i?86 | x86_64)
462 CFG_MACHFAULT=machfault-macos.h
463 FAULT_CONTEXT_INCLUDE='#include <signal.h>
464 #include <mach/thread_status.h>
465 #if defined __ppc64__
466 #define sigsegv_thread_state_t ppc_thread_state64_t
467 #elif defined __ppc__
468 #define sigsegv_thread_state_t ppc_thread_state_t
470 #if defined __x86_64__
471 #define sigsegv_thread_state_t x86_thread_state64_t
472 #elif defined __i386__
473 #if defined x86_THREAD_STATE32
474 #define sigsegv_thread_state_t x86_thread_state32_t
476 #define sigsegv_thread_state_t i386_thread_state_t
479 FAULT_CONTEXT='sigsegv_thread_state_t'
482 if test -n "$CFG_MACHFAULT"; then
483 CFG_HANDLER=handler-macos.c
484 CFG_FAULT=fault-macos.h # nonexistent, just a dummy
490 dnl Next, the cases where there is a hairy CPU dependent way to get the
493 if test -z "$CFG_FAULT" && test "$sv_cv_fault_linux_m68k" = yes; then
496 CFG_FAULT=fault-linux-m68k-old.h
497 FAULT_CONTEXT='struct sigcontext'
501 if test -z "$CFG_FAULT" && test "$sv_cv_fault_macosdarwin7_ppc" = yes; then
504 CFG_FAULT=fault-macosdarwin7-powerpc.h
505 FAULT_CONTEXT='ucontext_t'
506 FAULT_CONTEXT_INCLUDE='#include <signal.h>
507 #include <ucontext.h>'
511 if test -z "$CFG_FAULT" && test "$sv_cv_fault_macosdarwin5_ppc" = yes; then
514 CFG_FAULT=fault-macosdarwin5-powerpc.h
515 FAULT_CONTEXT='struct sigcontext'
521 FAULT_CONTEXT='CONTEXT'
522 FAULT_CONTEXT_INCLUDE='#include <windows.h>'
523 CFG_FAULT=fault-win32.h # nonexistent, just a dummy
526 FAULT_CONTEXT='CONTEXT'
527 FAULT_CONTEXT_INCLUDE='#include <windows.h>'
528 # Cygwin 1.7 uses fault-posix.h. Cygwin 1.5.x needs a hacky workaround.
529 if test -z "$CFG_FAULT"; then
530 CFG_FAULT=fault-cygwin-old.h
531 AC_DEFINE([OLD_CYGWIN_WORKAROUND], [1],
532 [Define to 1 on Cygwin versions older than 1.7.])
536 if test -n "$CFG_FAULT"; then
537 sv_cv_have_sigsegv_recovery=yes
539 sv_cv_have_sigsegv_recovery=no
541 dnl No way to get the fault address. But other information is available.
547 CFG_FAULT=fault-linux-alpha-old.h
548 FAULT_CONTEXT='struct sigcontext'
550 arm* | strongarm* | xscale*)
551 CFG_FAULT=fault-linux-arm-old.h
552 FAULT_CONTEXT='struct sigcontext'
555 CFG_FAULT=fault-linux-cris-old.h
556 FAULT_CONTEXT='struct sigcontext'
559 CFG_FAULT=fault-linux-mips-old.h
560 FAULT_CONTEXT='struct sigcontext'
563 CFG_FAULT=fault-linux-s390-old.h
564 FAULT_CONTEXT='struct sigcontext'
567 CFG_FAULT=fault-linux-sh-old.h
568 FAULT_CONTEXT='struct sigcontext'
571 CFG_FAULT=fault-linux-sparc-old.h
572 FAULT_CONTEXT='struct sigcontext'
575 CFG_FAULT=fault-linux-x86_64-old.h
576 FAULT_CONTEXT='struct sigcontext'
582 i?86 | x86_64) CFG_FAULT=fault-beos-i386.h ;;
583 *) CFG_FAULT=fault-beos.h ;;
585 FAULT_CONTEXT='struct vregs'
589 i?86 | x86_64) CFG_FAULT=fault-macos-i386.h ;;
591 FAULT_CONTEXT='struct sigcontext'
595 AC_MSG_CHECKING([for the fault handler specifics])
596 if test -n "$CFG_FAULT"; then
597 sv_cv_fault_include=$CFG_FAULT
599 if test -n "$CFG_MACHFAULT"; then
600 sv_cv_fault_include=$CFG_MACHFAULT
602 sv_cv_fault_include=none
605 AC_MSG_RESULT([$sv_cv_fault_include])
606 if test -z "$CFG_FAULT"; then
607 CFG_FAULT=fault-none.h
609 AC_DEFINE_UNQUOTED([CFG_FAULT], ["$CFG_FAULT"],
610 [The name of the include file describing the fault handler.])
611 if test -z "$CFG_MACHFAULT"; then
612 CFG_MACHFAULT=fault-none.h
614 AC_DEFINE_UNQUOTED([CFG_MACHFAULT], ["$CFG_MACHFAULT"],
615 [The name of the include file describing the Mach fault handler.])
616 AC_SUBST([FAULT_CONTEXT])
617 AC_SUBST([FAULT_CONTEXT_INCLUDE])
618 dnl AM_SUBST_NOTMAKE, because FAULT_CONTEXT_INCLUDE may have a multiline value.
619 AM_SUBST_NOTMAKE([FAULT_CONTEXT_INCLUDE])
621 dnl ================== Done with CFG_HANDLER partially, ==================
622 dnl ================== CFG_FAULT, CFG_MACHFAULT, ==================
623 dnl ================== FAULT_CONTEXT, FAULT_CONTEXT_INCLUDE ==================
626 dnl ===================== Determine HAVE_SIGSEGV_RECOVERY =====================
627 dnl Requires CFG_HANDLER / CFG_FAULT / etc.
629 AC_MSG_CHECKING([if the system supports catching SIGSEGV])
630 AC_MSG_RESULT([$sv_cv_have_sigsegv_recovery])
631 if test $sv_cv_have_sigsegv_recovery != no; then
632 HAVE_SIGSEGV_RECOVERY=1
634 HAVE_SIGSEGV_RECOVERY=0
636 AC_SUBST([HAVE_SIGSEGV_RECOVERY])
638 dnl ===================== Done with HAVE_SIGSEGV_RECOVERY =====================
641 dnl The stackoverflow_context_t type depends on the CFG_FAULT include file.
647 dnl ========================= Determine CFG_STACKVMA =========================
648 dnl Requires AC_CANONICAL_HOST.
650 dnl Determination of the stack's virtual memory area.
651 AC_CACHE_CHECK([for PIOCMAP in sys/procfs.h], [sv_cv_procfsvma], [
652 AC_TRY_LINK([#include <sys/procfs.h>],
653 [int x = PIOCNMAP + PIOCMAP; prmap_t y;],
654 [sv_cv_procfsvma=yes], [sv_cv_procfsvma=no])
656 AC_CHECK_FUNCS([mincore])
658 if test $sv_cv_procfsvma = yes; then
659 CFG_STACKVMA=stackvma-procfs.c
662 linux*) CFG_STACKVMA=stackvma-linux.c ;;
663 freebsd* | dragonfly*) CFG_STACKVMA=stackvma-freebsd.c ;;
664 beos*) CFG_STACKVMA=stackvma-beos.c ;;
665 macos* | darwin*) CFG_STACKVMA=stackvma-mach.c ;;
668 if test -z "$CFG_STACKVMA" && test $ac_cv_func_mincore = yes; then
669 CFG_STACKVMA=stackvma-mincore.c
671 if test -n "$CFG_STACKVMA"; then
672 AC_DEFINE([HAVE_STACKVMA], [1],
673 [Define if CFG_STACKVMA is set to a nontrivial source file.])
675 CFG_STACKVMA=stackvma-none.c
677 AC_DEFINE_UNQUOTED([CFG_STACKVMA], ["$CFG_STACKVMA"],
678 [The name of the file determining the stack virtual memory area.])
679 AC_SUBST([CFG_STACKVMA])
681 dnl ========================= Done with CFG_STACKVMA =========================
684 AC_CHECK_FUNCS([getrlimit setrlimit])
686 dnl Catching stack overflow requires an alternate signal stack.
687 dnl The old "install a guard page" trick would be unreliable, because
688 dnl we don't know where exactly to place the guard page.
692 dnl =========================== Determine CFG_LEAVE ===========================
693 dnl Requires AC_CANONICAL_HOST.
695 # How to longjmp out of a signal handler, in such a way that the
696 # alternate signal stack remains functional.
698 # On MacOS X 10.2 or newer, we don't need these tests, because we'll end up
699 # using handler-macos.c anyway. If we were to perform the tests, 2 Crash Report
700 # dialog windows would pop up.
702 macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*) ;;
705 dnl FIXME: Put in some more known values into the third argument.
706 SV_TRY_LEAVE_HANDLER_LONGJMP([], sv_cv_leave_handler_longjmp,
707 [*-*-osf[4-9]* | *-*-hpux11* | *-*-linux2.[2-9]*],
710 dnl FIXME: Put in some more known values into the third argument.
711 SV_TRY_LEAVE_HANDLER_LONGJMP([ and sigaltstack],
712 sv_cv_leave_handler_longjmp_sigaltstack,
716 #define SS_ONSTACK SA_ONSTACK
720 if (sigaltstack (NULL, &ss) >= 0)
722 ss.ss_flags &= ~SS_ONSTACK;
723 sigaltstack (&ss, NULL);
727 dnl FIXME: Put in some more known values into the third argument.
728 SV_TRY_LEAVE_HANDLER_LONGJMP([ and setcontext],
729 sv_cv_leave_handler_longjmp_setcontext,
730 [*-*-irix* | *-*-solaris*],
731 [#include <ucontext.h>
733 #define SS_ONSTACK SA_ONSTACK
737 static ucontext_t uc;
739 if (getcontext (&uc) >= 0)
741 if (uc.uc_stack.ss_flags & SS_ONSTACK)
743 uc.uc_stack.ss_flags &= ~SS_ONSTACK;
749 # End of MacOS X special casing.
753 # How to siglongjmp out of a signal handler, in such a way that the
754 # alternate signal stack remains functional.
756 # On MacOS X 10.2 or newer, we don't need these tests, because we'll end up
757 # using handler-macos.c anyway. If we were to perform the tests, 2 Crash Report
758 # dialog windows would pop up.
760 macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*) ;;
763 dnl FIXME: Put in some more known values into the third argument.
764 SV_TRY_LEAVE_HANDLER_SIGLONGJMP([], sv_cv_leave_handler_siglongjmp,
765 [*-*-osf[4-9]* | *-*-hpux11* | *-*-linux2.[2-9]* | *-*-irix* | *-*-solaris*],
768 dnl FIXME: Put in some more known values into the third argument.
769 SV_TRY_LEAVE_HANDLER_SIGLONGJMP([ and sigaltstack],
770 sv_cv_leave_handler_siglongjmp_sigaltstack,
774 #define SS_ONSTACK SA_ONSTACK
778 if (sigaltstack (NULL, &ss) >= 0)
780 ss.ss_flags &= ~SS_ONSTACK;
781 sigaltstack (&ss, NULL);
785 dnl FIXME: Put in some more known values into the third argument.
786 SV_TRY_LEAVE_HANDLER_SIGLONGJMP([ and setcontext],
787 sv_cv_leave_handler_siglongjmp_setcontext,
789 [#include <ucontext.h>
791 #define SS_ONSTACK SA_ONSTACK
795 static ucontext_t uc;
797 if (getcontext(&uc) >= 0)
799 if (uc.uc_stack.ss_flags & SS_ONSTACK)
801 uc.uc_stack.ss_flags &= ~SS_ONSTACK;
807 # End of MacOS X special casing.
812 if test "$sv_cv_leave_handler_longjmp" != no; then
813 CFG_LEAVE=leave-nop.c
815 if test "$sv_cv_leave_handler_longjmp_sigaltstack" != no; then
816 CFG_LEAVE=leave-sigaltstack.c
818 if test "$sv_cv_leave_handler_longjmp_setcontext" != no; then
819 CFG_LEAVE=leave-setcontext.c
824 # On BeOS, the 6 tests fail because sigaltstack() doesn't exist.
825 # If one uses set_signal_stack() instead of sigaltstack(), the first
826 # test actually works. i.e. sv_cv_leave_handler_longjmp would be 'yes'.
827 beos*) CFG_LEAVE=leave-nop.c ;;
829 if test -z "$CFG_LEAVE"; then
830 CFG_LEAVE=leave-none.c
832 AC_DEFINE_UNQUOTED([CFG_LEAVE], ["$CFG_LEAVE"],
833 [The name of the file implementing sigsegv_reset_onstack_flag.])
834 AC_SUBST([CFG_LEAVE])
836 dnl =========================== Done with CFG_LEAVE ===========================
839 dnl ================= Determine HAVE_STACK_OVERFLOW_RECOVERY =================
840 dnl Requires AC_CANONICAL_HOST, CFG_HANDLER / CFG_FAULT / etc., CFG_STACKVMA,
843 AC_CACHE_CHECK([if the system supports catching stack overflow],
844 [sv_cv_have_stack_overflow_recovery],
846 dnl On Mach, it requires a machfault-*.h (see src/handler-macos.c).
847 dnl On Unix, it requires either sigaltstack() or the BeOS set_signal_stack()
848 dnl function, and the ability to longjmp out of the signal handler, and on
849 dnl Unix it also requires a fault-*.h or a stackvma-*.c with certain
850 dnl properties (see src/handler-unix.c).
851 if test "$CFG_MACHFAULT" != fault-none.h; then
852 sv_cv_have_stack_overflow_recovery=yes
855 mingw* | cygwin*) sv_cv_have_stack_overflow_recovery=yes ;;
857 if test "$CFG_LEAVE" != 'leave-none.c'; then
858 if test "$sv_cv_sigaltstack" != no; then
859 sv_cv_have_stack_overflow_recovery=maybe
862 beos*) sv_cv_have_stack_overflow_recovery=maybe ;;
863 *) sv_cv_have_stack_overflow_recovery=no ;;
867 sv_cv_have_stack_overflow_recovery=no
872 if test $sv_cv_have_stack_overflow_recovery = maybe; then
873 if test -n "$CFG_FAULT"; then
874 AC_EGREP_CPP([xyzzy], [
875 #include "$srcdir/src/$CFG_FAULT"
876 #ifdef SIGSEGV_FAULT_HANDLER_ARGLIST
877 #ifdef SIGSEGV_FAULT_ADDRESS
881 ], [condA=true], [condA=false])
885 if test -n "$CFG_FAULT"; then
886 AC_EGREP_CPP([xyzzy], [
887 #include "$srcdir/src/$CFG_FAULT"
888 #ifdef SIGSEGV_FAULT_HANDLER_ARGLIST
889 #ifdef SIGSEGV_FAULT_STACKPOINTER
893 ], [condB=true], [condB=false])
897 if test "$CFG_STACKVMA" != "stackvma-none.c"; then
902 if { $condA && $condB; } || { $condA && $condC; } || { $condB && $condC; }; then
903 sv_cv_have_stack_overflow_recovery=yes
905 sv_cv_have_stack_overflow_recovery=no
909 if test $sv_cv_have_stack_overflow_recovery != no; then
910 HAVE_STACK_OVERFLOW_RECOVERY=1
912 HAVE_STACK_OVERFLOW_RECOVERY=0
914 AC_SUBST([HAVE_STACK_OVERFLOW_RECOVERY])
916 dnl ================= Done with HAVE_STACK_OVERFLOW_RECOVERY =================
919 dnl ======================= Determine CFG_HANDLER fully =======================
920 dnl Requires AC_CANONICAL_HOST, CFG_HANDLER / CFG_FAULT / etc.,
921 dnl HAVE_SIGSEGV_RECOVERY, HAVE_STACK_OVERFLOW_RECOVERY.
924 mingw* | cygwin*) CFG_HANDLER=handler-win32.c ;;
926 if test -z "$CFG_HANDLER"; then
927 if test $sv_cv_have_sigsegv_recovery = no \
928 && test $sv_cv_have_stack_overflow_recovery = no; then
929 CFG_HANDLER=handler-none.c
931 CFG_HANDLER=handler-unix.c
936 AC_DEFINE_UNQUOTED([CFG_HANDLER], ["$CFG_HANDLER"],
937 [The name of the file implementing the handler functionality.])
938 AC_SUBST([CFG_HANDLER])
940 dnl ======================= Done with CFG_HANDLER fully =======================
943 dnl Test whether to enable Cygwin specific tests.
944 AM_CONDITIONAL([CYGWIN],
950 dnl Test whether to make system calls fail with error EFAULT.
951 dnl More precisely: whether passing invalid memory accesses to system calls
952 dnl should make the system call fail with error EFAULT, rather than invoking
953 dnl the signal handler.
954 dnl It is necessary on Cygwin: otherwise the cygwin1 test fails.
956 cygwin*) enable_EFAULT=yes ;;
957 *) enable_EFAULT=no ;;
959 if test $enable_EFAULT = yes; then
960 AC_DEFINE([ENABLE_EFAULT], [1],
961 [Define to 1 if attempting to make system calls fail with error EFAULT])
963 AM_CONDITIONAL([ENABLE_EFAULT], [test $enable_EFAULT = yes])
965 if test $enable_EFAULT = yes; then
970 { echo; echo "${term_bold}Build Parameters:${term_norm}"; } >& AS_MESSAGE_FD
972 dnl Relocatability is a nop for this package.
975 { echo; echo "${term_bold}Output Substitution:${term_norm}"; } >& AS_MESSAGE_FD
977 dnl AC_OUTPUT([Makefile])
979 src/Makefile src/sigsegv.h
982 { echo; echo "Now please type '${term_bold}make${term_norm}' to compile. Good luck."; echo; } >& AS_MESSAGE_FD