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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 a3e5a90e3fcb
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Description:
POSIX formatted printing into an obstack.

Comment:
This module should not be used as a dependency from a test module,
otherwise when this module occurs as a tests-related module, it will
have side effects on the compilation of the 'vasnprintf' module, if
that module occurs among the main modules in lib/.

Files:
m4/obstack-printf.m4
m4/obstack-printf-posix.m4
m4/math_h.m4
lib/obstack_printf.c

Depends-on:
obstack
stdio
vasnprintf-posix
extensions

configure.ac:
gl_FUNC_OBSTACK_PRINTF_POSIX
if test $ac_cv_func_obstack_printf = no || test $REPLACE_OBSTACK_PRINTF = 1; then
  AC_LIBOBJ([obstack_printf])
fi
gl_STDIO_MODULE_INDICATOR([obstack-printf-posix])

Makefile.am:

Include:
<stdio.h>

License:
GPL

Maintainer:
Eric Blake