Merge from emacs-24; up to 2012-12-06T01:39:03Z!monnier@iro.umontreal.ca

[gnu-emacs] / src / conf_post.h

diff --git a/src/conf_post.h b/src/conf_post.h
index feb1bc2be193fda0f6b8dfc03bd2c1e2ac195e34..cd1e35bea7a4c110ca1743c355c7d9586150676f 100644 (file)
--- a/src/conf_post.h
+++ b/src/conf_post.h
@@ -40,6 +40,10 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 #endif
 #endif
 
+#ifndef __has_attribute
+# define __has_attribute(a) 0 /* non-clang */
+#endif
+
 /* This silences a few compilation warnings on FreeBSD.  */
 #ifdef BSD_SYSTEM_AHB
 #undef BSD_SYSTEM_AHB
@@ -121,14 +125,6 @@ You lose; /* Emacs for DOS must be compiled with DJGPP */
 
 #define emacs_raise(sig) msdos_fatal_signal (sig)
 
-#ifndef HAVE_SETPGID
-# ifdef USG
-#  define setpgid(pid, pgid) setpgrp ()
-# else
-#  define setpgid(pid, pgid) setpgrp (pid, pgid)
-# endif
-#endif
-
 /* Define one of these for easier conditionals.  */
 #ifdef HAVE_X_WINDOWS
 /* We need a little extra space, see ../../lisp/loadup.el and the
@@ -186,6 +182,10 @@ extern void _DebPrint (const char *fmt, ...);
 #endif
 #endif
 
+/* Tell gnulib to omit support for openat-related functions having a
+   first argument other than AT_FDCWD.  */
+#define GNULIB_SUPPORT_ONLY_AT_FDCWD
+
 #include <string.h>
 #include <stdlib.h>
 
@@ -195,7 +195,9 @@ extern void _DebPrint (const char *fmt, ...);
 #define NO_INLINE
 #endif
 
-#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1))
+#if (__clang__                                                         \
+     ? __has_attribute (externally_visible)                            \
+     : (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)))
 #define EXTERNALLY_VISIBLE __attribute__((externally_visible))
 #else
 #define EXTERNALLY_VISIBLE