[m-dev.] trivial diff: add `volatile' to runtime/mercury_dummy.{c,h}

[Fergus Henderson]

Estimated hours taken: 0.25

runtime/mercury_dummy.h:
runtime/mercury_dummy.c:
	Declare global_pointer and global_pointer_2 as `volatile'.
	These variables are dummy variables used to suppress optimization,
	and for that purpose it's safest to declare them as volatile.

Workspace: /d-drive/home/hg/fjh/mercury
Index: runtime/mercury_dummy.c
===================================================================
RCS file: /home/mercury1/repository/mercury/runtime/mercury_dummy.c,v
retrieving revision 1.4
diff -u -d -r1.4 mercury_dummy.c
--- runtime/mercury_dummy.c	1999/10/20 14:35:26	1.4
+++ runtime/mercury_dummy.c	1999/12/06 13:57:12
@@ -12,8 +12,8 @@
 ** that gcc can't inline it. Similarly for the two pointers.
 */
 
-void	*global_pointer;
-void	*global_pointer_2;
+void	*volatile global_pointer;
+void	*volatile global_pointer_2;
 
 void
 dummy_function_call(void)
Index: runtime/mercury_dummy.h
===================================================================
RCS file: /home/mercury1/repository/mercury/runtime/mercury_dummy.h,v
retrieving revision 1.3
diff -u -d -r1.3 mercury_dummy.h
--- runtime/mercury_dummy.h	1999/10/20 14:35:27	1.3
+++ runtime/mercury_dummy.h	1999/12/06 13:56:34
@@ -17,7 +17,7 @@
 
 extern	void	dummy_function_call(void);
 extern	void	*dummy_identify_function(void *);
-extern	void	*global_pointer;
-extern	void	*global_pointer_2;
+extern	void	*volatile global_pointer;
+extern	void	*volatile global_pointer_2;
 
 #endif /* not MERCURY_DUMMY_H */

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3        |     -- the last words of T. S. Garp.
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