[Boost-build] Hit the limit of the maximal Command Line

From: Franz Schnyder (fschnyder_at_[hidden])
Date: 2008-07-31 04:22:11

Hello

During our build I ran into the limit of 2047 characters for the command line on
windows. I work on Windows XP and found out that the limit is 8191. I applied
the following "patch" to execnt.c in BJam to change the limit for Windows XP. 

Maybe this would also help others with long command lines.

- Franz
   

 int maxline()
 {
   OSVERSIONINFO  os_info;
   os_info.dwOSVersionInfoSize = sizeof(os_info);
   GetVersionEx( &os_info );
-
-    return (os_info.dwMajorVersion == 3)
-        ? 996 /* NT 3.5.1 */
-        : 2047 /* NT >= 4.x */
-        ;
+  if(os_info.dwMajorVersion >= 5)
+  {
+     return 8191; /* XP > */
+  }
+  else if(os_info.dwMajorVersion == 4)
+  {
+     return 2047; /* NT 4.x */
+  }
+  else
+  {
+     return 996; /* NT 3.5.1 */
+  }
 }