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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 e443a6abf7f0
children 1f14c6dd175d
line wrap: on
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Description:
frexpl() function: split a 'long double' into its constituents, without
requiring libm.

Files:
lib/frexpl.c
lib/frexp.c
m4/frexpl.m4

Depends-on:
math
frexp-nolibm    [{ test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl_no_libm = no; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1]
isnanl-nolibm   [{ test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl_no_libm = no; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]
fpucw           [{ test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl_no_libm = no; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]

configure.ac:
gl_FUNC_FREXPL_NO_LIBM
if test $HAVE_DECL_FREXPL = 0 || test $gl_func_frexpl_no_libm = no; then
  AC_LIBOBJ([frexpl])
fi
gl_MATH_MODULE_INDICATOR([frexpl])

Makefile.am:

Include:
<math.h>

License:
LGPL

Maintainer:
Bruno Haible, Paolo Bonzini