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>

Description:
Find a POSIX-conforming shell.

Files:
m4/posix-shell.m4

Depends-on:

configure.ac:
gl_POSIX_SHELL

Makefile.am:
##Sample usage of posix-shell module:
#script: script.in
#	rm -f $@-t $@
#	sed -e 's#@''PREFERABLY_POSIX_SHELL''@#$(PREFERABLY_POSIX_SHELL)#g' \
#	    -e 's#@''POSIX_SHELL''@#$(POSIX_SHELL)#g' \
#	    -e $(srcdir)/$@.in >$@-t
#	chmod a+x $@-t
#	mv $@-t $@
#EXTRA_DIST += script.in
#MOSTLYCLEANFILES += script script-t

Include:

License:
GPLed build tool

Maintainer:
Paul Eggert