Avoid sending a signal to ourselves if we're not debugging

--HG--
extra : convert_revision : d6ba1ce30bad4a44d716238a8107c3bff0ce89c4

sim/debug.cc

@@ -40,11 +40,13 @@
 
 using namespace std;
 
+#ifdef DEBUG
 void
 debug_break()
 {
     kill(getpid(), SIGTRAP);
 }
+#endif
 
 //
 // Debug event: place a breakpoint on the process function and

sim/debug.hh

@@ -29,6 +29,10 @@
 #ifndef __DEBUG_HH__
 #define __DEBUG_HH__
 
+#ifdef DEBUG
 void debug_break();
+#else
+inline void debug_break() { }
+#endif
 
 #endif // __DEBUG_HH__