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:
isfinite macro: test for finite value (zero, subnormal, or normal, and not infinite or NaN).

Files:
lib/isfinite.c
m4/isfinite.m4
m4/check-math-lib.m4

Depends-on:
math
extensions
isnanf-nolibm   [test $REPLACE_ISFINITE = 1]
isnand-nolibm   [test $REPLACE_ISFINITE = 1]
isnanl-nolibm   [test $REPLACE_ISFINITE = 1]

configure.ac:
gl_ISFINITE
if test $REPLACE_ISFINITE = 1; then
  AC_LIBOBJ([isfinite])
fi
gl_MATH_MODULE_INDICATOR([isfinite])

Makefile.am:

Include:
<math.h>

License:
LGPL

Maintainer:
Ben Pfaff