Mercurial > gnulib
view modules/sqrtl @ 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 | 69d92a435ceb |
children |
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Description: sqrtl() function: square root with long double argument. Files: lib/sqrtl.c m4/sqrtl.m4 Depends-on: math extensions sqrt [{ test $HAVE_SQRTL = 0 || test $REPLACE_SQRTL = 1; }] float [{ test $HAVE_SQRTL = 0 || test $REPLACE_SQRTL = 1; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0] isnanl [{ test $HAVE_SQRTL = 0 || test $REPLACE_SQRTL = 1; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0] frexpl [{ test $HAVE_SQRTL = 0 || test $REPLACE_SQRTL = 1; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0] ldexpl [{ test $HAVE_SQRTL = 0 || test $REPLACE_SQRTL = 1; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0] configure.ac: gl_FUNC_SQRTL if test $HAVE_SQRTL = 0 || test $REPLACE_SQRTL = 1; then AC_LIBOBJ([sqrtl]) fi gl_MATH_MODULE_INDICATOR([sqrtl]) Makefile.am: Include: <math.h> Link: $(SQRTL_LIBM) License: LGPL Maintainer: Paolo Bonzini