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:
ftello() function: Retrieve the position of a FILE stream.

Files:
lib/ftello.c
lib/stdio-impl.h
m4/fseeko.m4
m4/ftello.m4

Depends-on:
stdio
extensions
largefile
sys_types
lseek           [test $HAVE_FTELLO = 0 || test $REPLACE_FTELLO = 1]
# Just to guarantee consistency between ftell() and ftello().
ftell

configure.ac-early:
AC_REQUIRE([AC_FUNC_FSEEKO])

configure.ac:
gl_FUNC_FTELLO
if test $HAVE_FTELLO = 0 || test $REPLACE_FTELLO = 1; then
  AC_LIBOBJ([ftello])
  gl_PREREQ_FTELLO
fi
gl_STDIO_MODULE_INDICATOR([ftello])

Makefile.am:

Include:
<stdio.h>

License:
LGPLv2+

Maintainer:
Bruno Haible