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:
Determine whether the current locale is different from the "C" locale.

Files:
lib/hard-locale.h
lib/hard-locale.c
m4/hard-locale.m4

Depends-on:
stdbool
strdup

configure.ac:
gl_HARD_LOCALE

Makefile.am:
lib_SOURCES += hard-locale.c

Include:
"hard-locale.h"

License:
GPL

Maintainer:
Paul Eggert