add header guard for #include <rw/_defs.h>
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         Key: STDCXX-213
         URL: http://issues.apache.org/jira/browse/STDCXX-213
     Project: C++ Standard Library
        Type: Improvement

    Versions: 4.1.2, 4.1.3    
 Environment: all
    Reporter: Martin Sebor
    Priority: Minor


Moved from the Rogue Wave bug tracking database:

****Created By: dean @ Jun 02, 2004 09:58:11 AM****
Hi Kathy,

  Here is the request that I have for additional work for RogueWave to do for us.  This is a minor request but has some big payback, especially when the RogueWave code is checked into ClearCase.  In my simple test, I reduced the number of include files that were opened from 200 to 100!  I haven't run the big test yet (the one that opens more than 2,400 header files.

  The request is to add a different kind of header guard (in addition to the one that is currently being used).  For example, instead of the code:

#include <rw/_defs.h>

Use the code:

#ifndef _RWSTD_DEFS_H_INCLUDED

  #include <rw/_defs.h>

#endif

  This should be done in all header files and .cc files for all #includes that have header guards.

  Let me know if this isn't clear or you have questions.

Thanks,

Bert


**** Entered By: dean @ Wednesday, June 02, 2004 9:58:03 AM **** 

****Modified By: sebor @ Apr 11, 2005 03:11:29 PM****
This is doable but it has been assumed that modern preprocessors implement this optimization. It would be useful to know what compiler the customer is using.

Deferred for now.

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