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>

Description:
Locking in multithreaded situations.

Files:
lib/glthread/lock.h
lib/glthread/lock.c
m4/lock.m4

Depends-on:
threadlib

configure.ac:
gl_LOCK
gl_MODULE_INDICATOR([lock])

Makefile.am:
lib_SOURCES += glthread/lock.h glthread/lock.c

Include:
"glthread/lock.h"

Link:
$(LTLIBTHREAD) when linking with libtool, $(LIBTHREAD) otherwise

License:
LGPLv2+

Maintainer:
Bruno Haible