- eliminate duplicate symbol names in modules

bochs-testing/plugin-test/test8-execlass/module1.cc

@@ -1,5 +1,7 @@
 #include <stdio.h>
 #include "main.h"
+#define _buildsym(sym) libmodule1_LTX_##sym
+#include "modules.h"
 
 void module_init ()
 {

bochs-testing/plugin-test/test8-execlass/module2.cc

@@ -1,5 +1,7 @@
 #include <stdio.h>
 #include "main.h"
+#define _buildsym(sym) libmodule2_LTX_##sym
+#include "modules.h"
 
 int n_operations = 0;
 

bochs-testing/plugin-test/test8-execlass/modules.h

@@ -0,0 +1,17 @@
+// This file is included by each module to rename all of its symbols, in order
+// to avoid duplicate symbols in different modules.  From the libtool docs:
+// "Although some platforms support having the same symbols defined more than
+// once it is generally not portable."
+
+#define module_init _buildsym(module_init)
+#define operate _buildsym(operate)
+
+// Declare function prototypes in an extern "C" block so that C++ will not
+// mangle their names (any more than we already have).
+extern "C" {
+  void module_init();
+  int operate (int a, int b);
+};
+
+// Since the renaming and extern "C" stuff declaration is done in the
+// header file, the actual code remains readable.