Mercurial > gnulib
view modules/fnmatch @ 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 | 3cbb6b1d4cc3 |
children | 4434607ac1ce |
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Description: fnmatch() function: wildcard matching. Files: lib/fnmatch.in.h lib/fnmatch.c lib/fnmatch_loop.c m4/mbstate_t.m4 m4/fnmatch.m4 Depends-on: extensions snippet/arg-nonnull alloca [test -n "$FNMATCH_H"] stdbool [test -n "$FNMATCH_H"] wchar [test -n "$FNMATCH_H"] wctype-h [test -n "$FNMATCH_H"] memchr [test -n "$FNMATCH_H"] memcmp [test -n "$FNMATCH_H"] mbsrtowcs [test -n "$FNMATCH_H"] mbsinit [test -n "$FNMATCH_H"] configure.ac: gl_FUNC_FNMATCH_POSIX if test -n "$FNMATCH_H"; then AC_LIBOBJ([fnmatch]) gl_PREREQ_FNMATCH fi Makefile.am: BUILT_SOURCES += $(FNMATCH_H) # We need the following in order to create <fnmatch.h> when the system # doesn't have one that supports the required API. if GL_GENERATE_FNMATCH_H fnmatch.h: fnmatch.in.h $(top_builddir)/config.status $(ARG_NONNULL_H) $(AM_V_GEN)rm -f $@-t $@ && \ { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \ sed -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \ < $(srcdir)/fnmatch.in.h; \ } > $@-t && \ mv -f $@-t $@ else fnmatch.h: $(top_builddir)/config.status rm -f $@ endif MOSTLYCLEANFILES += fnmatch.h fnmatch.h-t Include: <fnmatch.h> License: LGPLv2+ Maintainer: all, glibc