Mercurial > gnulib
view modules/stdarg @ 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 | e31f2db55434 |
children | 1f14c6dd175d |
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Description: An <stdarg.h> that conforms to C99. Files: lib/stdarg.in.h m4/stdarg.m4 Depends-on: include_next configure.ac-early: dnl Some compilers (e.g., AIX 5.3 cc) need to be in c99 mode dnl for the builtin va_copy to work. With Autoconf 2.60 or later, dnl gl_PROG_CC_C99 arranges for this. With older Autoconf gl_PROG_CC_C99 dnl shouldn't hurt, though installers are on their own to set c99 mode. gl_PROG_CC_C99 configure.ac: gl_STDARG_H Makefile.am: BUILT_SOURCES += $(STDARG_H) # We need the following in order to create <stdarg.h> when the system # doesn't have one that works with the given compiler. if GL_GENERATE_STDARG_H stdarg.h: stdarg.in.h $(top_builddir)/config.status $(AM_V_GEN)rm -f $@-t $@ && \ { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \ sed -e 's|@''GUARD_PREFIX''@|${gl_include_guard_prefix}|g' \ -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \ -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \ -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \ -e 's|@''NEXT_STDARG_H''@|$(NEXT_STDARG_H)|g' \ < $(srcdir)/stdarg.in.h; \ } > $@-t && \ mv $@-t $@ else stdarg.h: $(top_builddir)/config.status rm -f $@ endif MOSTLYCLEANFILES += stdarg.h stdarg.h-t Include: <stdarg.h> License: LGPLv2+ Maintainer: Bruno Haible