[RFA] Fix build failure with old versions of expat

[Joel Brobecker <brobecker@adacore.com>]

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Hello,

On certain machines we have, GDB fails to build because the libexpat
version it has installed is so old that the XMLCALL macro is not
defined (we have version 1.95.8). The attached patch should fix
the problem.

2007-02-20  Joel Brobecker  <brobecker@adacore.com>

        * gdb_expat.h (XMLCALL): Define if not already defined.

Tested on 2 different x86-linux machines: One that does have a recent
libexpat, and another that has an older one.

OK to apply?

Thanks,
-- 
Joel

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Index: gdb_expat.h
===================================================================
RCS file: /cvs/src/src/gdb/gdb_expat.h,v
retrieving revision 1.2
diff -u -p -r1.2 gdb_expat.h
--- gdb_expat.h	9 Jan 2007 17:58:50 -0000	1.2
+++ gdb_expat.h	20 Feb 2007 18:44:01 -0000
@@ -31,4 +31,10 @@
 # define XML_STATUS_ERROR 0
 #endif
 
+/* Old versions of expat do not define this macro, so define it
+   as void.  */
+#ifndef XMLCALL
+#define XMLCALL
+#endif
+
 #endif /* !defined(GDB_EXPAT_H) */