view modules/strings @ 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 4f0f8efbcc1e
children 79454345ccfc
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Description:
A substitute <strings.h>.

Files:
lib/strings.in.h
m4/strings_h.m4

Depends-on:
include_next
snippet/arg-nonnull
snippet/c++defs
snippet/warn-on-use
sys_types

configure.ac:
gl_HEADER_STRINGS_H

Makefile.am:
BUILT_SOURCES += strings.h

# We need the following in order to create <strings.h> when the system
# doesn't have one that works with the given compiler.
strings.h: strings.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_USE_H) $(ARG_NONNULL_H)
	$(AM_V_GEN)rm -f $@-t $@ && \
	{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */' && \
	  sed -e 's|@''GUARD_PREFIX''@|${gl_include_guard_prefix}|g' \
	      -e 's|@''HAVE_STRINGS_H''@|$(HAVE_STRINGS_H)|g' \
	      -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
	      -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
	      -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
	      -e 's|@''NEXT_STRINGS_H''@|$(NEXT_STRINGS_H)|g' \
	      -e 's|@''GNULIB_FFS''@|$(GNULIB_FFS)|g' \
	      -e 's|@''HAVE_FFS''@|$(HAVE_FFS)|g' \
	      -e 's|@''HAVE_STRCASECMP''@|$(HAVE_STRCASECMP)|g' \
	      -e 's|@''HAVE_DECL_STRNCASECMP''@|$(HAVE_DECL_STRNCASECMP)|g' \
	      -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
	      -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
	      -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
	      < $(srcdir)/strings.in.h; \
	} > $@-t && \
	mv $@-t $@
MOSTLYCLEANFILES += strings.h strings.h-t

Include:
<strings.h>

License:
LGPLv2+

Maintainer:
all