- print VM stack trace on startup abort exception

https://forum.zdoom.org/viewtopic.php?t=62650

src/posix/cocoa/i_main_except.cpp

@@ -32,9 +32,11 @@
  */
 // Workaround for GCC Objective-C++ with C++ exceptions bug.
 
-#include "doomerrors.h"
 #include <stdlib.h>
 
+#include "doomerrors.h"
+#include "vm.h"
+
 // Import some functions from i_main.mm
 void call_terms();
 void Mac_I_FatalError(const char* const message);
@@ -50,10 +52,21 @@ void OriginalMainExcept(int argc, char** argv)
 	{
 		const char* const message = error.what();
 
-		if (NULL != message)
+		if (strcmp(message, "NoRunExit"))
 		{
-			if (strcmp(message, "NoRunExit")) fprintf(stderr, "%s\n", message);
-			Mac_I_FatalError(message);
+			if (CVMAbortException::stacktrace.IsNotEmpty())
+			{
+				Printf("%s", CVMAbortException::stacktrace.GetChars());
+			}
+
+			if (batchrun)
+			{
+				Printf("%s\n", message);
+			}
+			else
+			{
+				Mac_I_FatalError(message);
+			}
 		}
 
 		exit(-1);

src/posix/sdl/i_main.cpp

@@ -52,6 +52,7 @@
 #include "cmdlib.h"
 #include "r_utility.h"
 #include "doomstat.h"
+#include "vm.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -261,16 +262,31 @@ int main (int argc, char **argv)
     catch (std::exception &error)
     {
 		I_ShutdownJoysticks();
-		if (error.what () && strcmp(error.what(), "NoRunExit"))
-			fprintf (stderr, "%s\n", error.what ());
 
+		const char *const message = error.what();
+
+		if (strcmp(message, "NoRunExit"))
+		{
+			if (CVMAbortException::stacktrace.IsNotEmpty())
+			{
+				Printf("%s", CVMAbortException::stacktrace.GetChars());
+			}
+
+			if (batchrun)
+			{
+				Printf("%s\n", message);
+			}
+			else
+			{
 #ifdef __APPLE__
-		Mac_I_FatalError(error.what());
+				Mac_I_FatalError(message);
 #endif // __APPLE__
 
 #ifdef __linux__
-		Linux_I_FatalError(error.what());
+				Linux_I_FatalError(message);
 #endif // __linux__
+			}
+		}
 
 		exit (-1);
     }

src/win32/i_main.cpp

@@ -71,6 +71,7 @@
 #include "r_utility.h"
 #include "g_levellocals.h"
 #include "s_sound.h"
+#include "vm.h"
 
 #include "stats.h"
 #include "st_start.h"
@@ -1057,6 +1058,11 @@ void DoMain (HINSTANCE hInstance)
 		auto msg = error.what();
 		if (strcmp(msg, "NoRunExit"))
 		{
+			if (CVMAbortException::stacktrace.IsNotEmpty())
+			{
+				Printf("%s", CVMAbortException::stacktrace.GetChars());
+			}
+
 			if (!batchrun)
 			{
 				ShowErrorPane(msg);