Mercurial > gnulib
view modules/copysign @ 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 | 0c3a9bb9a370 |
children | 1f14c6dd175d |
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Description: copysign() function: copy sign into another 'double' number. Files: lib/copysign.c m4/copysign.m4 m4/mathfunc.m4 Depends-on: math signbit [test $HAVE_COPYSIGN = 0] configure.ac: gl_FUNC_COPYSIGN if test $HAVE_COPYSIGN = 0; then AC_LIBOBJ([copysign]) fi gl_MATH_MODULE_INDICATOR([copysign]) Makefile.am: Include: <math.h> Link: $(COPYSIGN_LIBM) License: LGPL Maintainer: Bruno Haible