Mercurial > gnulib
view m4/gl-openssl.m4 @ 37246:5cfb3a67238d
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>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 03 Dec 2013 10:34:13 -0700 |
parents | 135e82dafbea |
children | efe50ad06bac |
line wrap: on
line source
# gl-openssl.m4 serial 1 dnl Copyright (C) 2013 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_CRYPTO_CHECK], [ AC_ARG_WITH([openssl], [AS_HELP_STRING([--with-openssl], [use libcrypto hash routines if available: default=no])], [], [with_openssl=no]) if test "x$1" = xMD5; then ALG_header=md5.h else ALG_header=sha.h fi LIB_CRYPTO= AC_SUBST([LIB_CRYPTO]) if test "x$with_openssl" != xno; then AC_CHECK_LIB([crypto], [$1], [AC_CHECK_HEADERS([openssl/$ALG_header], [LIB_CRYPTO='-lcrypto' AC_DEFINE([HAVE_OPENSSL_$1],[1], [Define to 1 if libcrypto is used for $1])])]) if test "x$with_openssl" = xyes; then if test "x$LIB_CRYPTO" = x; then AC_MSG_WARN([openssl development library not found for $1]) fi fi fi ])