1 dnl Autoconf configuration for libsigsegv.
2 dnl Process this file with autoconf to produce a configure script.
4 dnl Copyright (C) 2002-2011 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], [2.10])
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([mquery mincore])
658 if test $sv_cv_procfsvma = yes; then
659 CFG_STACKVMA=stackvma-procfs.c
662 linux*) CFG_STACKVMA=stackvma-linux.c ;;
663 freebsd* | dragonfly*) CFG_STACKVMA=stackvma-freebsd.c ;;
664 netbsd*) CFG_STACKVMA=stackvma-netbsd.c ;;
665 beos*) CFG_STACKVMA=stackvma-beos.c ;;
666 macos* | darwin*) CFG_STACKVMA=stackvma-mach.c ;;
669 dnl We prefer the mquery based approach over the mincore based approach,
670 dnl because stackvma-mincore.c:is_unmapped() has a bad worst-case runtime.
671 if test -z "$CFG_STACKVMA" && test $ac_cv_func_mquery = yes; then
672 CFG_STACKVMA=stackvma-mquery.c
674 if test -z "$CFG_STACKVMA" && test $ac_cv_func_mincore = yes; then
675 CFG_STACKVMA=stackvma-mincore.c
677 if test -n "$CFG_STACKVMA"; then
678 AC_DEFINE([HAVE_STACKVMA], [1],
679 [Define if CFG_STACKVMA is set to a nontrivial source file.])
681 CFG_STACKVMA=stackvma-none.c
683 AC_DEFINE_UNQUOTED([CFG_STACKVMA], ["$CFG_STACKVMA"],
684 [The name of the file determining the stack virtual memory area.])
685 AC_SUBST([CFG_STACKVMA])
687 dnl ========================= Done with CFG_STACKVMA =========================
690 AC_CHECK_FUNCS([getrlimit setrlimit])
692 dnl Catching stack overflow requires an alternate signal stack.
693 dnl The old "install a guard page" trick would be unreliable, because
694 dnl we don't know where exactly to place the guard page.
698 dnl =========================== Determine CFG_LEAVE ===========================
699 dnl Requires AC_CANONICAL_HOST.
701 # How to longjmp out of a signal handler, in such a way that the
702 # alternate signal stack remains functional.
704 # On MacOS X 10.2 or newer, we don't need these tests, because we'll end up
705 # using handler-macos.c anyway. If we were to perform the tests, 2 Crash Report
706 # dialog windows would pop up.
708 macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*) ;;
711 dnl FIXME: Put in some more known values into the third argument.
712 SV_TRY_LEAVE_HANDLER_LONGJMP([], sv_cv_leave_handler_longjmp,
713 [*-*-osf[4-9]* | *-*-hpux11* | *-*-linux2.[2-9]*],
716 dnl FIXME: Put in some more known values into the third argument.
717 SV_TRY_LEAVE_HANDLER_LONGJMP([ and sigaltstack],
718 sv_cv_leave_handler_longjmp_sigaltstack,
722 #define SS_ONSTACK SA_ONSTACK
726 if (sigaltstack (NULL, &ss) >= 0)
728 ss.ss_flags &= ~SS_ONSTACK;
729 sigaltstack (&ss, NULL);
733 dnl FIXME: Put in some more known values into the third argument.
734 SV_TRY_LEAVE_HANDLER_LONGJMP([ and setcontext],
735 sv_cv_leave_handler_longjmp_setcontext,
736 [*-*-irix* | *-*-solaris*],
737 [#include <ucontext.h>
739 #define SS_ONSTACK SA_ONSTACK
743 static ucontext_t uc;
745 if (getcontext (&uc) >= 0)
747 if (uc.uc_stack.ss_flags & SS_ONSTACK)
749 uc.uc_stack.ss_flags &= ~SS_ONSTACK;
755 # End of MacOS X special casing.
759 # How to siglongjmp out of a signal handler, in such a way that the
760 # alternate signal stack remains functional.
762 # On MacOS X 10.2 or newer, we don't need these tests, because we'll end up
763 # using handler-macos.c anyway. If we were to perform the tests, 2 Crash Report
764 # dialog windows would pop up.
766 macos* | darwin[[6-9]]* | darwin[[1-9]][[0-9]]*) ;;
769 dnl FIXME: Put in some more known values into the third argument.
770 SV_TRY_LEAVE_HANDLER_SIGLONGJMP([], sv_cv_leave_handler_siglongjmp,
771 [*-*-osf[4-9]* | *-*-hpux11* | *-*-linux2.[2-9]* | *-*-irix* | *-*-solaris*],
774 dnl FIXME: Put in some more known values into the third argument.
775 SV_TRY_LEAVE_HANDLER_SIGLONGJMP([ and sigaltstack],
776 sv_cv_leave_handler_siglongjmp_sigaltstack,
780 #define SS_ONSTACK SA_ONSTACK
784 if (sigaltstack (NULL, &ss) >= 0)
786 ss.ss_flags &= ~SS_ONSTACK;
787 sigaltstack (&ss, NULL);
791 dnl FIXME: Put in some more known values into the third argument.
792 SV_TRY_LEAVE_HANDLER_SIGLONGJMP([ and setcontext],
793 sv_cv_leave_handler_siglongjmp_setcontext,
795 [#include <ucontext.h>
797 #define SS_ONSTACK SA_ONSTACK
801 static ucontext_t uc;
803 if (getcontext(&uc) >= 0)
805 if (uc.uc_stack.ss_flags & SS_ONSTACK)
807 uc.uc_stack.ss_flags &= ~SS_ONSTACK;
813 # End of MacOS X special casing.
818 if test "$sv_cv_leave_handler_longjmp" != no; then
819 CFG_LEAVE=leave-nop.c
821 if test "$sv_cv_leave_handler_longjmp_sigaltstack" != no; then
822 CFG_LEAVE=leave-sigaltstack.c
824 if test "$sv_cv_leave_handler_longjmp_setcontext" != no; then
825 CFG_LEAVE=leave-setcontext.c
830 # On BeOS, the 6 tests fail because sigaltstack() doesn't exist.
831 # If one uses set_signal_stack() instead of sigaltstack(), the first
832 # test actually works. i.e. sv_cv_leave_handler_longjmp would be 'yes'.
833 beos*) CFG_LEAVE=leave-nop.c ;;
835 if test -z "$CFG_LEAVE"; then
836 CFG_LEAVE=leave-none.c
838 AC_DEFINE_UNQUOTED([CFG_LEAVE], ["$CFG_LEAVE"],
839 [The name of the file implementing sigsegv_reset_onstack_flag.])
840 AC_SUBST([CFG_LEAVE])
842 dnl =========================== Done with CFG_LEAVE ===========================
845 dnl ================= Determine HAVE_STACK_OVERFLOW_RECOVERY =================
846 dnl Requires AC_CANONICAL_HOST, CFG_HANDLER / CFG_FAULT / etc., CFG_STACKVMA,
849 AC_CACHE_CHECK([if the system supports catching stack overflow],
850 [sv_cv_have_stack_overflow_recovery],
852 dnl On Mach, it requires a machfault-*.h (see src/handler-macos.c).
853 dnl On Unix, it requires either sigaltstack() or the BeOS set_signal_stack()
854 dnl function, and the ability to longjmp out of the signal handler, and on
855 dnl Unix it also requires a fault-*.h or a stackvma-*.c with certain
856 dnl properties (see src/handler-unix.c).
857 if test "$CFG_MACHFAULT" != fault-none.h; then
858 sv_cv_have_stack_overflow_recovery=yes
861 mingw* | cygwin*) sv_cv_have_stack_overflow_recovery=yes ;;
863 if test "$CFG_LEAVE" != 'leave-none.c'; then
864 if test "$sv_cv_sigaltstack" != no; then
865 sv_cv_have_stack_overflow_recovery=maybe
868 beos*) sv_cv_have_stack_overflow_recovery=maybe ;;
869 *) sv_cv_have_stack_overflow_recovery=no ;;
873 sv_cv_have_stack_overflow_recovery=no
878 if test $sv_cv_have_stack_overflow_recovery = maybe; then
879 if test -n "$CFG_FAULT"; then
880 AC_EGREP_CPP([xyzzy], [
881 #include "$srcdir/src/$CFG_FAULT"
882 #ifdef SIGSEGV_FAULT_HANDLER_ARGLIST
883 #ifdef SIGSEGV_FAULT_ADDRESS
887 ], [condA=true], [condA=false])
891 if test -n "$CFG_FAULT"; then
892 AC_EGREP_CPP([xyzzy], [
893 #include "$srcdir/src/$CFG_FAULT"
894 #ifdef SIGSEGV_FAULT_HANDLER_ARGLIST
895 #ifdef SIGSEGV_FAULT_STACKPOINTER
899 ], [condB=true], [condB=false])
903 if test "$CFG_STACKVMA" != "stackvma-none.c"; then
908 if { $condA && $condB; } || { $condA && $condC; } || { $condB && $condC; }; then
909 sv_cv_have_stack_overflow_recovery=yes
911 sv_cv_have_stack_overflow_recovery=no
915 if test $sv_cv_have_stack_overflow_recovery != no; then
916 HAVE_STACK_OVERFLOW_RECOVERY=1
918 HAVE_STACK_OVERFLOW_RECOVERY=0
920 AC_SUBST([HAVE_STACK_OVERFLOW_RECOVERY])
922 dnl ================= Done with HAVE_STACK_OVERFLOW_RECOVERY =================
925 dnl ======================= Determine CFG_HANDLER fully =======================
926 dnl Requires AC_CANONICAL_HOST, CFG_HANDLER / CFG_FAULT / etc.,
927 dnl HAVE_SIGSEGV_RECOVERY, HAVE_STACK_OVERFLOW_RECOVERY.
930 mingw* | cygwin*) CFG_HANDLER=handler-win32.c ;;
932 if test -z "$CFG_HANDLER"; then
933 if test $sv_cv_have_sigsegv_recovery = no \
934 && test $sv_cv_have_stack_overflow_recovery = no; then
935 CFG_HANDLER=handler-none.c
937 CFG_HANDLER=handler-unix.c
942 AC_DEFINE_UNQUOTED([CFG_HANDLER], ["$CFG_HANDLER"],
943 [The name of the file implementing the handler functionality.])
944 AC_SUBST([CFG_HANDLER])
946 dnl ======================= Done with CFG_HANDLER fully =======================
948 dnl Test whether to enable Cygwin specific tests.
949 AM_CONDITIONAL([CYGWIN],
955 dnl Test whether to make system calls fail with error EFAULT.
956 dnl More precisely: whether passing invalid memory accesses to system calls
957 dnl should make the system call fail with error EFAULT, rather than invoking
958 dnl the signal handler.
959 dnl It is necessary on Cygwin: otherwise the cygwin1 test fails.
961 cygwin*) enable_EFAULT=yes ;;
962 *) enable_EFAULT=no ;;
964 if test $enable_EFAULT = yes; then
965 AC_DEFINE([ENABLE_EFAULT], [1],
966 [Define to 1 if attempting to make system calls fail with error EFAULT])
968 AM_CONDITIONAL([ENABLE_EFAULT], [test $enable_EFAULT = yes])
970 if test $enable_EFAULT = yes; then
975 dnl Test for features used in tests.
979 { echo; echo "${term_bold}Build Parameters:${term_norm}"; } >& AS_MESSAGE_FD
981 dnl Relocatability is a nop for this package.
984 { echo; echo "${term_bold}Output Substitution:${term_norm}"; } >& AS_MESSAGE_FD
986 dnl AC_OUTPUT([Makefile])
988 src/Makefile src/sigsegv.h
991 { echo; echo "Now please type '${term_bold}make${term_norm}' to compile. Good luck."; echo; } >& AS_MESSAGE_FD