Add stopping in the debugger when nhassert() is hit in the windows port.

When stopping in the debugger after having called impossible, the windowing
state will have been modified since the assertion was hit.  This made
examining state that caused the nhassert to fire no longer possible.
To avoid this issue, we now detect the debugger and stop in the debugger
prior to impossible.

diff --git a/sys/winnt/winnt.c b/sys/winnt/winnt.c
index 8d513c59e8e361ea2128803dd3df289a45f019ee..39978cab478c49f010a04860964696118d3d1850 100644 (file)
--- a/sys/winnt/winnt.c
+++ b/sys/winnt/winnt.c
@@ -718,9 +718,19 @@ nt_assert_failed(expression, filepath, line)
 {
     const char * filename;
 
-    /* get file name from path */
     filename = strrchr(filepath, '\\');
     filename = (filename == NULL ? filepath : filename + 1);
+
+    if (IsDebuggerPresent()) {
+        char message[BUFSIZ];
+        snprintf(message, sizeof(message), 
+            "nhassert(%s) failed in file '%s' at line %d",
+            expression, filename, line);
+        OutputDebugStringA(message);
+        DebugBreak();
+    }
+
+    /* get file name from path */
     impossible("nhassert(%s) failed in file '%s' at line %d",
                 expression, filename, line);
 }