Copy __FUNCTION__ portability #defines from mesa/compiler.h to eglcompiler.h

Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>
Signed-off-by: Brian Paul <brianp@vmware.com>

src/egl/main/eglcompiler.h

@@ -71,5 +71,23 @@
 #  define PUBLIC
 #endif
 
+/**
+ * The __FUNCTION__ gcc variable is generally only used for debugging.
+ * If we're not using gcc, define __FUNCTION__ as a cpp symbol here.
+ * Don't define it if using a newer Windows compiler.
+ */
+#ifndef __FUNCTION__
+# if defined(__VMS)
+#  define __FUNCTION__ "VMS$NL:"
+# elif ((!defined __GNUC__) || (__GNUC__ < 2)) && (!defined __xlC__) && \
+      (!defined(_MSC_VER) || _MSC_VER < 1300)
+#  if (__STDC_VERSION__ >= 199901L) /* C99 */ || \
+    (defined(__SUNPRO_C) && defined(__C99FEATURES__))
+#   define __FUNCTION__ __func__
+#  else
+#   define __FUNCTION__ "<unknown>"
+#  endif
+# endif
+#endif
 
 #endif /* EGLCOMPILER_INCLUDED */