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:
File descriptor functions that avoid clobbering STD{IN,OUT,ERR}_FILENO.

Files:
lib/unistd--.h
lib/dup-safer.c
lib/fd-safer.c
lib/pipe-safer.c
lib/unistd-safer.h
m4/unistd-safer.m4

Depends-on:
fcntl
unistd

configure.ac:
gl_UNISTD_SAFER

Makefile.am:
lib_SOURCES += dup-safer.c fd-safer.c pipe-safer.c

Include:
"unistd-safer.h"

License:
GPL

Maintainer:
Paul Eggert, Jim Meyering