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:
isnan macro: test for NaN value.

Files:
m4/isnan.m4

Depends-on:
isnanf
isnand
isnanl
math
extensions

configure.ac:
gl_ISNAN
gl_MATH_MODULE_INDICATOR([isnan])

Makefile.am:

Include:
<math.h>

License:
LGPL

Maintainer:
Ben Pfaff