[m-rev.] diff: fix bug #106

[Julien Fischer]

Fix bug #106 - linking Mercury program's against C++ object files
on Mac OS X was resulting in duplicate symbol errors.

runtime/mercury_trace_base.h:
 	Mark some global variables as extern in order to prevent
 	confusing the linker.

Julien

Index: runtime/mercury_trace_base.h
===================================================================
RCS file: /home/mercury/mercury1/repository/mercury/runtime/mercury_trace_base.h,v
retrieving revision 1.64
diff -u -r1.64 mercury_trace_base.h
--- runtime/mercury_trace_base.h	25 Nov 2008 07:46:55 -0000	1.64
+++ runtime/mercury_trace_base.h	21 Sep 2009 16:02:05 -0000
@@ -460,8 +460,8 @@
  ** only when MR_trace_tailrec_have_reused_frames is true.
  */

-MR_bool             MR_trace_tailrec_have_reused_frames;
-MR_Unsigned         MR_trace_tailrec_num_reused_frames;
+extern  MR_bool      MR_trace_tailrec_have_reused_frames;
+extern  MR_Unsigned  MR_trace_tailrec_num_reused_frames;

  /*
  ** The details of I/O tabling are documented in library/table_builtin.m.
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