sim: Fix clang warning for unused variable

This patch ensures the NULL ISA can build without causing issues with
an unused variable.

diff --git a/src/sim/system.hh b/src/sim/system.hh
index 5b166eabf31f3603ccbd15433554fcc68f3ecaae..c8945c8c12a21ca0e22df5d19db7733f93036104 100644 (file)
--- a/src/sim/system.hh
+++ b/src/sim/system.hh
@@ -380,7 +380,7 @@ class System : public MemObject
     T *addFuncEvent(const SymbolTable *symtab, const char *lbl,
                     const std::string &desc, Args... args)
     {
-        Addr addr = 0; // initialize only to avoid compiler warning
+        Addr addr M5_VAR_USED = 0; // initialize only to avoid compiler warning
 
 #if THE_ISA != NULL_ISA
         if (symtab->findAddress(lbl, addr)) {