Mercurial > gnulib
view m4/sched_h.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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# sched_h.m4 serial 6 dnl Copyright (C) 2008-2013 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. dnl Written by Bruno Haible. AC_DEFUN([gl_SCHED_H], [ AC_COMPILE_IFELSE( [AC_LANG_PROGRAM([[ #include <sched.h> struct sched_param a; int b[] = { SCHED_FIFO, SCHED_RR, SCHED_OTHER }; pid_t t1; ]])], [SCHED_H=''], [SCHED_H='sched.h' gl_CHECK_NEXT_HEADERS([sched.h]) if test $ac_cv_header_sched_h = yes; then HAVE_SCHED_H=1 else HAVE_SCHED_H=0 fi AC_SUBST([HAVE_SCHED_H]) AC_CHECK_TYPE([struct sched_param], [HAVE_STRUCT_SCHED_PARAM=1], [HAVE_STRUCT_SCHED_PARAM=0], [#include <sched.h>]) AC_SUBST([HAVE_STRUCT_SCHED_PARAM]) dnl Ensure the type pid_t gets defined. AC_REQUIRE([AC_TYPE_PID_T]) ]) AC_SUBST([SCHED_H]) AM_CONDITIONAL([GL_GENERATE_SCHED_H], [test -n "$SCHED_H"]) ])