1 files changed, 34 insertions, 12 deletions
diff --git a/generic/tclPanic.c b/generic/tclPanic.c
index 0a63076..2a453b9 100644
--- a/generic/tclPanic.c
+++ b/generic/tclPanic.c
@@ -11,25 +11,23 @@
  *
  * See the file "license.terms" for information on usage and redistribution of
  * this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * RCS: @(#) $Id: tclPanic.c,v 1.12 2008/10/26 18:34:04 dkf Exp $
  */
 
 #include "tclInt.h"
+#if defined(_WIN32) || defined(__CYGWIN__)
+    MODULE_SCOPE void tclWinDebugPanic(const char *format, ...);
+#endif
 
 /*
  * The panicProc variable contains a pointer to an application specific panic
  * procedure.
  */
 
+#if defined(__CYGWIN__)
+static Tcl_PanicProc *panicProc = tclWinDebugPanic;
+#else
 static Tcl_PanicProc *panicProc = NULL;
-
-/*
- * The platformPanicProc variable contains a pointer to a platform specific
- * panic procedure, if any. (TclpPanic may be NULL via a macro.)
- */
-
-static Tcl_PanicProc *const platformPanicProc = TclpPanic;
+#endif
 
 /*
  *----------------------------------------------------------------------
@@ -51,6 +49,14 @@ void
 Tcl_SetPanicProc(
     Tcl_PanicProc *proc)
 {
+#if defined(_WIN32)
+    /* tclWinDebugPanic only installs if there is no panicProc yet. */
+    if ((proc != tclWinDebugPanic) || (panicProc == NULL))
+#elif defined(__CYGWIN__)
+    if (proc == NULL)
+	panicProc = tclWinDebugPanic;
+    else
+#endif
     panicProc = proc;
 }
 
@@ -91,15 +97,31 @@ Tcl_PanicVA(
 
     if (panicProc != NULL) {
 	panicProc(format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
-    } else if (platformPanicProc != NULL) {
-	platformPanicProc(format, arg1, arg2, arg3, arg4, arg5, arg6, arg7,
-		arg8);
+#ifdef _WIN32
+    } else if (IsDebuggerPresent()) {
+	tclWinDebugPanic(format, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8);
+#endif
     } else {
 	fprintf(stderr, format, arg1, arg2, arg3, arg4, arg5, arg6, arg7,
 		arg8);
 	fprintf(stderr, "\n");
 	fflush(stderr);
+#if defined(_WIN32) || defined(__CYGWIN__)
+#   if defined(__GNUC__)
+	__builtin_trap();
+#   elif defined(_WIN64)
+	__debugbreak();
+#   elif defined(_MSC_VER)
+	_asm {int 3}
+#   else
+	DebugBreak();
+#   endif
+#endif
+#if defined(_WIN32)
+	ExitProcess(1);
+#else
 	abort();
+#endif
     }
 }