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:
Look up an environment variable, returning 0 in insecure situations.

Files:
lib/secure_getenv.c
m4/secure_getenv.m4

Depends-on:
stdlib
extensions

configure.ac:
gl_FUNC_SECURE_GETENV
if test $HAVE_SECURE_GETENV = 0; then
  AC_LIBOBJ([secure_getenv])
  gl_PREREQ_SECURE_GETENV
fi
gl_STDLIB_MODULE_INDICATOR([secure_getenv])

Makefile.am:

Include:
<stdlib.h>

Link:

License:
LGPLv2+

Maintainer:
all