[CMake] can't pipe cl.exe in a custom command

[Alexander.Camek at elektrobit.com]

Hi,

> I'm trying to grab the cl.exe banner so I can determine the 
> MSVC version number.  If cl.exe is in the path, then the 
> following works at a Windows Command Prompt.  This gives a 
> short banner with the VC version number and copyright.
> 
>   cl /? 2> banner.txt
> 
> But when I try to do it in a custom command, I can't get it 
> to pipe to a file.  I see the output go by in the Visual 
> Studio output window, with 1> prefixed in front of all the 
> lines, and it is saved in BuildLog.htm, but cbanner.txt has 0 
> length no matter whether I use >
> 1> 2> as the pipe.  Does MSVC simply not have a notion of piping or
> something?  Do I have to do something MSVC-specific to 
> capture the output or the error?
> 
> IF(MSVC)
> ADD_CUSTOM_COMMAND(
>   OUTPUT ${CMAKE_BINARY_DIR}/cbanner.txt
>   WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
>   COMMAND ${CMAKE_C_COMPILER} /? 2> cbanner.txt
> )
> ADD_CUSTOM_TARGET(cbanner ALL
>   DEPENDS ${CMAKE_BINARY_DIR}/cbanner.txt
> )
> ENDIF(MSVC)

Had a similar problem during generating a file with >> or with >. 
Then I used VERBATIM and it worked.

Maybe this will help here too.

Greetings

Alexander


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