Mercurial > gnulib
view m4/sysexits.m4 @ 37246:5cfb3a67238d
regex: avoid glibc deadlock during configure
glibc has a known bug where certain corruptions of the heap can
cause malloc to default to printing a debug message that includes
a backtrace, but the act of getting the backtrace uses dlopen
which in turn calls into malloc, causing a recursive lock ending
in deadlock. Thus, when configure is probing for a known glibc
heap corruption bug, the overall configure would hang.
The solution suggested by glibc developers is to force malloc
to quit printing debug messages, which avoids recursive malloc.
* m4/regex.m4 (gl_REGEX): Avoid recursive malloc deadlock when
glibc bug 15078 in turn triggers bug 16159.
Reported by Michal Privoznik.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 03 Dec 2013 10:34:13 -0700 |
parents | c741bc27922a |
children | 344018b6e5d7 |
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# sysexits.m4 serial 6 dnl Copyright (C) 2003, 2005, 2007, 2009-2013 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_SYSEXITS], [ AC_CHECK_HEADERS_ONCE([sysexits.h]) if test $ac_cv_header_sysexits_h = yes; then HAVE_SYSEXITS_H=1 gl_CHECK_NEXT_HEADERS([sysexits.h]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sysexits.h>]], [[switch (0) { case EX_OK: case EX_USAGE: case EX_DATAERR: case EX_NOINPUT: case EX_NOUSER: case EX_NOHOST: case EX_UNAVAILABLE: case EX_SOFTWARE: case EX_OSERR: case EX_OSFILE: case EX_CANTCREAT: case EX_IOERR: case EX_TEMPFAIL: case EX_PROTOCOL: case EX_NOPERM: case EX_CONFIG: break; } ]])], [SYSEXITS_H=], [SYSEXITS_H=sysexits.h]) else HAVE_SYSEXITS_H=0 SYSEXITS_H=sysexits.h fi AC_SUBST([HAVE_SYSEXITS_H]) AC_SUBST([SYSEXITS_H]) AM_CONDITIONAL([GL_GENERATE_SYSEXITS_H], [test -n "$SYSEXITS_H"]) ])