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>

Files:
tests/test-fprintf-posix.sh
tests/test-fprintf-posix.c
tests/test-fprintf-posix.h
tests/test-printf-posix.output
tests/test-fprintf-posix2.sh
tests/test-fprintf-posix2.c
tests/test-fprintf-posix3.sh
tests/test-fprintf-posix3.c
tests/infinity.h
tests/signature.h
tests/macros.h

Depends-on:
stdint
get-rusage-as

configure.ac:
AC_CHECK_FUNCS_ONCE([getrlimit setrlimit])

Makefile.am:
TESTS += test-fprintf-posix.sh test-fprintf-posix2.sh test-fprintf-posix3.sh
check_PROGRAMS += test-fprintf-posix test-fprintf-posix2 test-fprintf-posix3