bug#4643: two different definitions for catchlist in eval.c and alloc.c

[Dan Nicolaescu]

Here's a patch that fixes this problem by moving the definition in a
separate file included in both places.

OK to check in?

Index: src/Makefile.in
===================================================================
RCS file: /cvsroot/emacs/emacs/src/Makefile.in,v
retrieving revision 1.450
diff -u -3 -p -r1.450 Makefile.in
--- src/Makefile.in     26 Sep 2009 19:49:17 -0000      1.450
+++ src/Makefile.in     7 Oct 2009 08:26:06 -0000
@@ -1231,14 +1231,14 @@ xsmfns.o: xsmfns.c $(config_h) systime.h
 /* The files of Lisp proper */
 
 alloc.o: alloc.c process.h frame.h window.h buffer.h  puresize.h syssignal.h 
keyboard.h \
- blockinput.h atimer.h systime.h character.h dispextern.h $(config_h) \
+ blockinput.h atimer.h systime.h character.h dispextern.h catchtag.h 
$(config_h) \
  $(INTERVALS_H)
 bytecode.o: bytecode.c buffer.h syntax.h character.h window.h dispextern.h \
   frame.h xterm.h $(config_h)
 data.o: data.c buffer.h puresize.h character.h syssignal.h keyboard.h frame.h \
    termhooks.h $(config_h)
 eval.o: eval.c commands.h keyboard.h blockinput.h atimer.h systime.h \
-  dispextern.h $(config_h)
+  dispextern.h catchtag.h $(config_h)
 floatfns.o: floatfns.c syssignal.h $(config_h)
 fns.o: fns.c commands.h $(config_h) frame.h buffer.h character.h keyboard.h \
  keymap.h frame.h window.h dispextern.h $(INTERVALS_H) coding.h md5.h \
Index: src/alloc.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/alloc.c,v
retrieving revision 1.449
diff -u -3 -p -r1.449 alloc.c
--- src/alloc.c 25 Aug 2009 06:03:09 -0000      1.449
+++ src/alloc.c 7 Oct 2009 08:26:08 -0000
@@ -56,6 +56,7 @@ along with GNU Emacs.  If not, see <http
 #include "syssignal.h"
 #include "termhooks.h"         /* For struct terminal.  */
 #include <setjmp.h>
+#include "catchtag.h"
 
 /* GC_MALLOC_CHECK defined means perform validity checks of malloc'd
    memory.  Can do this only if using gmalloc.c.  */
@@ -4939,13 +4940,6 @@ staticpro (varaddress)
     abort ();
 }
 
-struct catchtag
-{
-    Lisp_Object tag;
-    Lisp_Object val;
-    struct catchtag *next;
-};
-
 
 /***********************************************************************
                          Protection from GC
Index: src/eval.c
===================================================================
RCS file: /cvsroot/emacs/emacs/src/eval.c,v
retrieving revision 1.315
diff -u -3 -p -r1.315 eval.c
--- src/eval.c  1 Oct 2009 17:47:44 -0000       1.315
+++ src/eval.c  7 Oct 2009 08:26:08 -0000
@@ -26,6 +26,7 @@ along with GNU Emacs.  If not, see <http
 #include "keyboard.h"
 #include "dispextern.h"
 #include <setjmp.h>
+#include "catchtag.h"
 
 #if HAVE_X_WINDOWS
 #include "xterm.h"
@@ -49,41 +50,6 @@ struct backtrace
 
 struct backtrace *backtrace_list;
 
-/* This structure helps implement the `catch' and `throw' control
-   structure.  A struct catchtag contains all the information needed
-   to restore the state of the interpreter after a non-local jump.
-
-   Handlers for error conditions (represented by `struct handler'
-   structures) just point to a catch tag to do the cleanup required
-   for their jumps.
-
-   catchtag structures are chained together in the C calling stack;
-   the `next' member points to the next outer catchtag.
-
-   A call like (throw TAG VAL) searches for a catchtag whose `tag'
-   member is TAG, and then unbinds to it.  The `val' member is used to
-   hold VAL while the stack is unwound; `val' is returned as the value
-   of the catch form.
-
-   All the other members are concerned with restoring the interpreter
-   state.  */
-
-struct catchtag
-{
-  Lisp_Object tag;
-  Lisp_Object val;
-  struct catchtag *next;
-  struct gcpro *gcpro;
-  jmp_buf jmp;
-  struct backtrace *backlist;
-  struct handler *handlerlist;
-  int lisp_eval_depth;
-  int pdlcount;
-  int poll_suppress_count;
-  int interrupt_input_blocked;
-  struct byte_stack *byte_stack;
-};
-
 struct catchtag *catchlist;
 
 #ifdef DEBUG_GCPRO
--- /dev/null   2009-08-21 19:23:04.524086726 -0700
+++ src/catchtag.h      2009-10-07 01:11:39.784950000 -0700
@@ -0,0 +1,57 @@
+/* Structure for implementing the `catch' and `throw' control structure.
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef CATCHTAG_H
+#define CATCHTAG_H
+
+/* This structure helps implement the `catch' and `throw' control
+   structure.  A struct catchtag contains all the information needed
+   to restore the state of the interpreter after a non-local jump.
+
+   Handlers for error conditions (represented by `struct handler'
+   structures) just point to a catch tag to do the cleanup required
+   for their jumps.
+
+   catchtag structures are chained together in the C calling stack;
+   the `next' member points to the next outer catchtag.
+
+   A call like (throw TAG VAL) searches for a catchtag whose `tag'
+   member is TAG, and then unbinds to it.  The `val' member is used to
+   hold VAL while the stack is unwound; `val' is returned as the value
+   of the catch form.
+
+   All the other members are concerned with restoring the interpreter
+   state.  */
+
+struct catchtag
+{
+  Lisp_Object tag;
+  Lisp_Object val;
+  struct catchtag *next;
+  struct gcpro *gcpro;
+  jmp_buf jmp;
+  struct backtrace *backlist;
+  struct handler *handlerlist;
+  int lisp_eval_depth;
+  int pdlcount;
+  int poll_suppress_count;
+  int interrupt_input_blocked;
+  struct byte_stack *byte_stack;
+};
+
+#endif /* CATCHTAG_H */