Mercurial > gnulib
view m4/va-args.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 | c741bc27922a |
children | 344018b6e5d7 |
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# va-args.m4 serial 1 dnl Copyright (C) 2009-2013 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. dnl Test for variadic macro support. dnl Define HAVE_VA_ARGS if macros can use __VA_ARGS__. AC_DEFUN([gl_VA_ARGS], [ AC_CACHE_CHECK([whether the preprocessor allows variadic macros], [gl_cv_c_va_args], [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #include <stdio.h> #define a(func, arg, ...) func (arg, __VA_ARGS__) #define b(...) a (__VA_ARGS__) ]], [[b (printf, "%s", "test");]])], [gl_cv_c_va_args=yes], [gl_cv_c_va_args=no]) ]) if test $gl_cv_c_va_args = yes; then AC_DEFINE([HAVE_VA_ARGS], [1], [Define to 1 if the preprocessor supports variadic macros and __VA_ARGS__.]) fi ])