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>

#ifndef _GL_DI_SET_H
# define _GL_DI_SET_H

# include <sys/types.h>

# undef _GL_ATTRIBUTE_NONNULL
# if __GNUC__ == 3 && __GNUC_MINOR__ >= 3 || 3 < __GNUC__
#  define _GL_ATTRIBUTE_NONNULL(m) __attribute__ ((__nonnull__ (m)))
# else
#  define _GL_ATTRIBUTE_NONNULL(m)
# endif

struct di_set *di_set_alloc (void);
int di_set_insert (struct di_set *, dev_t, ino_t) _GL_ATTRIBUTE_NONNULL (1);
void di_set_free (struct di_set *) _GL_ATTRIBUTE_NONNULL (1);
int di_set_lookup (struct di_set *dis, dev_t dev, ino_t ino)
  _GL_ATTRIBUTE_NONNULL (1);

#endif