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:
dup2() function: duplicate an open file descriptor.

Files:
lib/dup2.c
m4/dup2.m4

Depends-on:
unistd
dup2-obsolete
msvc-inval      [test $HAVE_DUP2 = 0 || test $REPLACE_DUP2 = 1]
msvc-nothrow    [test $HAVE_DUP2 = 0 || test $REPLACE_DUP2 = 1]

configure.ac:
gl_FUNC_DUP2
if test $HAVE_DUP2 = 0 || test $REPLACE_DUP2 = 1; then
  AC_LIBOBJ([dup2])
  gl_PREREQ_DUP2
fi
gl_UNISTD_MODULE_INDICATOR([dup2])

Makefile.am:

Include:
<unistd.h>

License:
LGPLv2+

Maintainer:
Paul Eggert, Jim Meyering