citadel/m4/ucread.m4

   1 # Check if "struct ucred" is available.  If not, try harder with
   2 # _GNU_SOURCE.
   3 #
   4 # heavily inspired by: http://git.musicpd.org/cgit/master/mpd.git/tree/m4/ucred.m4
   5 # Author: Max Kellermann <max@duempel.org>
   6
   7 AC_DEFUN([STRUCT_UCRED],[
   8         AC_MSG_CHECKING([for struct ucred])
   9         AC_CACHE_VAL(mpd_cv_have_struct_ucred, [
  10                 AC_TRY_COMPILE([#include <sys/socket.h>],
  11                         [struct ucred cred;],
  12                         mpd_cv_have_struct_ucred=yes,
  13                         mpd_cv_have_struct_ucred=no)
  14                 if test x$mpd_cv_have_struct_ucred = xno; then
  15                         # glibc 2.8 forces _GNU_SOURCE on us
  16                         AC_TRY_COMPILE(
  17                                 [#define _GNU_SOURCE
  18                                  #include <sys/socket.h>],
  19                                 [struct ucred cred;],
  20                                 mpd_cv_have_struct_ucred=yes,
  21                                 mpd_cv_have_struct_ucred=no)
  22                         if test x$mpd_cv_have_struct_ucred = xyes; then
  23                                 # :(
  24                                 MPD_CFLAGS="$MPD_CFLAGS -D_GNU_SOURCE"
  25                         fi
  26                 fi
  27                 ])
  28
  29         AC_MSG_RESULT($mpd_cv_have_struct_ucred)
  30         if test x$mpd_cv_have_struct_ucred = xyes; then
  31                 AC_DEFINE(HAVE_STRUCT_UCRED, 1, [Define if struct ucred is present from sys/socket.h])
  32         fi
  33 ])