On 5. Jul, 2010, at 7:46 , Todd Gamblin wrote:

> The documentation here:
> 
>       
> http://www.cmake.org/cmake/help/cmake2.6docs.html#variable:CMAKE_COMPILER_IS_GNULANG
> 
> is in conflict with the documentation here:
> 
>       http://www.cmake.org/Wiki/CMake_Useful_Variables
> 
> And this thread (though it's from 2008) seems to imply that the second link 
> above is right, even though the first is more current:
> 
>       http://www.mail-archive.com/cmake@cmake.org/msg16863.html
> 
> 
> I'm using CMake 2.8.2, and I'm noticing that CMAKE_COMPILER_IS_GNUC is empty, 
> which conflicts with the latest documentation on the wiki.  This makes it 
> hard to do things like this:
> 
>>      for (lang C CXX Fortran)
>>              if (CMAKE_COMPILER_IS_GNU${lang})
>>                      ...
>>              endif()
>>      endfor()
> 
> Looking through the CMake source, it doesn't look like 
> CMAKE_COMPILER_IS_GNUFortran is used anywhere.  I tested it, and it looks 
> like it's empty too.  Would it be possible to add CMAKE_COMPILER_IS_GNUC and 
> CMAKE_COMPILER_IS_GNUFortran so that they actually work?  I think this would 
> be more consistent than the current setup.
> 
> These issues are coming up in the platform files I'm making for BlueGeneP.  I 
> think writing things like this would be easier if this were more consistent.
> 
> -Todd

The variables are called CMAKE_COMPILER_IS_GNUC, CMAKE_COMPILER_IS_GNUCXX and 
CMAKE_COMPILER_IS_GNUG77 (the latter is admittedly weird)

Michael
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