Mercurial > gnulib
view m4/unlink-busy.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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#serial 12 dnl From J. David Anglin. dnl HPUX and other systems can't unlink shared text that is being executed. # Copyright (C) 2000-2001, 2004, 2007, 2009-2013 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_UNLINK_BUSY_TEXT], [dnl AC_CACHE_CHECK([whether a running program can be unlinked], gl_cv_func_unlink_busy_text, [ AC_RUN_IFELSE( [AC_LANG_SOURCE( [AC_INCLUDES_DEFAULT[ int main (int argc, char **argv) { int result = 0; if (argc == 0) result |= 1; else if (unlink (argv[0]) != 0) result |= 2; return result; }]])], gl_cv_func_unlink_busy_text=yes, gl_cv_func_unlink_busy_text=no, gl_cv_func_unlink_busy_text=no ) ] ) if test $gl_cv_func_unlink_busy_text = no; then INSTALL=$ac_install_sh fi ])