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
line wrap: on
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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