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hexen: Replace v1.0 warning with an error.

The warning message would have been missed by anyone not running from
the console (ie. a good portion of all Windows and Mac users), so
replace the warning message with an error instead (I_Error calls
produce a GUI message popup). Allow this behavior to be overridden by
using a special command line flag.

--- a/src/hexen/h2_main.c

+++ b/src/hexen/h2_main.c

@@ -270,15 +270,26 @@

 	maxplayers = 4;

     }

-    // The v1.0 IWAD file is missing a bunch of lumps.

-    if (gamemode != shareware && W_CheckNumForName("CLUS1MSG") == -1)

+    // The v1.0 IWAD file is missing a bunch of lumps that can cause the game

+    // to crash, so we exit with an error if the user tries to play with it.

+    // But we provide an override command line flag if they really want to

+    // do it.

+

+    //!

+    // If provided, the check for the v1.0 IWAD file is disabled, even though

+    // it will almost certainly cause the game to crash.

+    //

+    // @category compat

+    //

+

+    if (!M_ParmExists("-v10override")

+     && gamemode != shareware && W_CheckNumForName("CLUS1MSG") < 0)

     {

-        printf(

-            "** WARNING: You are playing with the Hexen v1.0 IWAD. This\n"

-            "** isn't supported by " PACKAGE_NAME ", and you may find that\n"

-            "** the game will crash. Please upgrade to the v1.1 IWAD file.\n"

-            "** See here for more information:\n"

-            "**   http://www.doomworld.com/classicdoom/info/patches.php\n");

+        I_Error(

+            "You are trying to use the Hexen v1.0 IWAD. This isn't\n"

+            "supported by " PACKAGE_NAME ". Please upgrade to the v1.1\n"

+            "IWAD file. See here for more information:\n"

+            "  http://www.doomworld.com/classicdoom/info/patches.php");

     }

 }