# Check if "struct ucred" is available. If not, try harder with # _GNU_SOURCE. # # Author: Max Kellermann <max@duempel.org> AC_DEFUN([STRUCT_UCRED],[ AC_MSG_CHECKING([for struct ucred]) AC_CACHE_VAL(mpd_cv_have_struct_ucred, [ AC_TRY_COMPILE([#include <sys/socket.h>], [struct ucred cred;], mpd_cv_have_struct_ucred=yes, mpd_cv_have_struct_ucred=no) if test x$mpd_cv_have_struct_ucred = xno; then # glibc 2.8 forces _GNU_SOURCE on us AC_TRY_COMPILE( [#define _GNU_SOURCE #include <sys/socket.h>], [struct ucred cred;], mpd_cv_have_struct_ucred=yes, mpd_cv_have_struct_ucred=no) if test x$mpd_cv_have_struct_ucred = xyes; then # :( MPD_CFLAGS="$MPD_CFLAGS -D_GNU_SOURCE" fi fi ]) AC_MSG_RESULT($mpd_cv_have_struct_ucred) if test x$mpd_cv_have_struct_ucred = xyes; then AC_DEFINE(HAVE_STRUCT_UCRED, 1, [Define if struct ucred is present from sys/socket.h]) fi ])