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:
truncl() function: round towards zero.

Files:
lib/truncl.c
lib/trunc.c
m4/truncl.m4

Depends-on:
math
extensions
trunc           [{ test $HAVE_DECL_TRUNCL = 0 || test $REPLACE_TRUNCL = 1; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 1]
float           [{ test $HAVE_DECL_TRUNCL = 0 || test $REPLACE_TRUNCL = 1; } && test $HAVE_SAME_LONG_DOUBLE_AS_DOUBLE = 0]

configure.ac:
gl_FUNC_TRUNCL
if test $HAVE_DECL_TRUNCL = 0 || test $REPLACE_TRUNCL = 1; then
  AC_LIBOBJ([truncl])
fi
gl_MATH_MODULE_INDICATOR([truncl])

Makefile.am:

Include:
<math.h>

Link:
$(TRUNCL_LIBM)

License:
LGPL

Maintainer:
Bruno Haible