Vladimir Simonov(sv@sw.ru) - mingw support.
Useful if you crossbuild Linux app on Windows.
- Debug info now contains C:/mydir/myfile.c (vs. C:\mydir\myfile.c).
  This permits debug such app on Linux box (just create C: dir or simlink
  and simulate appropriate path.
Index: gcc/gcc/gcc.c
===================================================================
--- gcc.orig/gcc/gcc.c
+++ gcc/gcc/gcc.c
@@ -6207,6 +6207,16 @@ main (int argc, char **argv)
   struct user_specs *uptr;
   char **old_argv = argv;
 
+#if HAVE_DOS_BASED_FILE_SYSTEM
+   if (argc > 0)
+     {
+	   char *pp;
+	   argv[0]=xstrdup (argv[0]);
+	   while ((pp = strchr (argv[0], '\\')) != NULL)
+		 *pp = '/';
+     }
+#endif
+
   /* Initialize here, not in definition.  The IRIX 6 O32 cc sometimes chokes
      on ?: in file-scope variable initializations.  */
   asm_debug = ASM_DEBUG_SPEC;