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:
Counts the number of trailing 0-bits in a word.

Files:
lib/count-trailing-zeros.c
lib/count-trailing-zeros.h
m4/count-trailing-zeros.m4

Depends-on:
extern-inline

configure.ac:
gl_COUNT_TRAILING_ZEROS

Makefile.am:
lib_SOURCES += count-trailing-zeros.c

Include:
"count-trailing-zeros.h"

License:
LGPLv2+

Maintainer:
all