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>

@node func
@section func

The @code{func} module makes sure that you can use the predefined
identifier @code{__func__} as defined by C99 in your code.

A small example is:

@smallexample
#include <config.h>
#include <stdio.h> /* for printf */

int main (void)
@{
    printf ("%s: hello world\n", __func__);
@}
@end smallexample

Note that @code{sizeof} cannot be applied to @code{__func__}: On SunPRO C
compiler, @code{sizeof __func__} evaluates to 0.