[Emacs-diffs] Changes to emacs/src/lisp.h,v

[Juanma Barranquero]

CVSROOT:        /cvsroot/emacs
Module name:    emacs
Changes by:     Juanma Barranquero <lektu>      07/06/08 19:56:24

Index: lisp.h
===================================================================
RCS file: /cvsroot/emacs/emacs/src/lisp.h,v
retrieving revision 1.576
retrieving revision 1.577
diff -u -b -r1.576 -r1.577
--- lisp.h      20 May 2007 02:44:05 -0000      1.576
+++ lisp.h      8 Jun 2007 19:56:24 -0000       1.577
@@ -701,7 +701,10 @@
 #endif /* not GC_CHECK_STRING_BYTES */
 
 /* Mark STR as a unibyte string.  */
-#define STRING_SET_UNIBYTE(STR)      (XSTRING (STR)->size_byte = -1)
+#define STRING_SET_UNIBYTE(STR)  \
+  do { if (EQ (STR, empty_multibyte_string))  \
+      (STR) = empty_unibyte_string;  \
+    else XSTRING (STR)->size_byte = -1; } while (0)
 
 /* Get text properties.  */
 #define STRING_INTERVALS(STR)  (XSTRING (STR)->intervals + 0)
@@ -3060,7 +3063,8 @@
 /* defined in emacs.c */
 extern Lisp_Object decode_env_path P_ ((char *, char *));
 extern Lisp_Object Vinvocation_name, Vinvocation_directory;
-extern Lisp_Object Vinstallation_directory, empty_string;
+extern Lisp_Object Vinstallation_directory;
+extern Lisp_Object empty_unibyte_string, empty_multibyte_string;
 EXFUN (Fkill_emacs, 1);
 #if HAVE_SETLOCALE
 void fixup_locale P_ ((void));