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:
dprintf() function: print formatted output to a file descriptor

Files:
lib/dprintf.c
m4/dprintf.m4

Depends-on:
stdio
vasnprintf      [test $ac_cv_func_dprintf = no || test $REPLACE_DPRINTF = 1]
full-write      [test $ac_cv_func_dprintf = no || test $REPLACE_DPRINTF = 1]
errno           [test $ac_cv_func_dprintf = no || test $REPLACE_DPRINTF = 1]

configure.ac:
gl_FUNC_DPRINTF
gl_STDIO_MODULE_INDICATOR([dprintf])

Makefile.am:

Include:
<stdio.h>

License:
LGPL

Maintainer:
Bruno Haible