sm_crash: take a reason

when failing an assertion, pass the reason to sm_crash, in case we don't make it to logging checkpoints

stepmania/src/global.cpp

@@ -2,7 +2,7 @@
 
 #if defined(_WINDOWS)
 #include "windows.h"
-void NORETURN sm_crash()
+void NORETURN sm_crash( const char *reason )
 {
 	// throws an exception that gets caught by the exception handler
 	DebugBreak();
@@ -14,13 +14,13 @@ void NORETURN sm_crash()
 #elif defined(LINUX) || defined(DARWIN)
 #include "archutils/Unix/CrashHandler.h"
 #include <unistd.h>
-void NORETURN sm_crash()
+void NORETURN sm_crash( const char *reason )
 {
-	ForceCrashHandler( "Internal error" );
+	ForceCrashHandler( reason );
 	_exit( 1 );
 }
 #else
-void NORETURN sm_crash()
+void NORETURN sm_crash( const char *reason )
 {
 	*(char*)0=0;
 

stepmania/src/global.h

@@ -88,13 +88,13 @@ namespace Checkpoints
 #define NORETURN
 #endif
 
-void NORETURN sm_crash();
+void NORETURN sm_crash( const char *reason = "Internal error" );
 
 /* Assertion that sets an optional message and brings up the crash handler, so
  * we get a backtrace.  This should probably be used instead of throwing an
  * exception in most cases we expect never to happen (but not in cases that
  * we do expect, such as DSound init failure.) */
-#define FAIL_M(MESSAGE) { CHECKPOINT_M(MESSAGE); sm_crash(); }
+#define FAIL_M(MESSAGE) { CHECKPOINT_M(MESSAGE); sm_crash(MESSAGE); }
 #define ASSERT_M(COND, MESSAGE) { if(!(COND)) { FAIL_M(MESSAGE); } }
 #define ASSERT(COND) ASSERT_M((COND), "Assertion '" #COND "' failed")