[CMake] recommended way to test for msvc/cl ?

[David Cole]

Wouldn't it be preferable to remain compile independent as much as 
possible and avoid CMake blocks that are compiler specific?

Perhaps a TRY_COMPILE would be more appropriate than the "compiler 
matches regex" test...

You didn't actually say when starting this thread why you wanted to 
detect the cl compiler. Is it so you can set some compiler specific 
flags? Or do you have source that is known only to compile with cl? Is 
CMake missing a feature that requires you to know what compiler is being 
used?


Just probing for other possible solutions,
David

Alexander Neundorf wrote:

>Hi, 
> 
>  
>
>>Von: Brad King <brad.king at kitware.com> 
>> 
>>Alexander Neundorf wrote: 
>>    
>>
>>>There is a variable CMAKE_COMPILER_IS_GNUCC, which is set for gcc. 
>>>AFAIK there is no CMAKE_COMPILER_IS_MSVC.   
>>>There are CMAKE_C_COMPILER and CMAKE_GENERATOR_CC, which are probably 
>>>set to "cl" both for MSVC and nmake Makefiles ?  
>>>  
>>>So which test is recommended ?  
>>>      
>>>
>> 
>>We've used 
>> 
>>IF("${CMAKE_C_COMPILER}" MATCHES "^cl$") 
>> 
>>and this should work for you for now, but... 
>>    
>>
> 
>Sure ? This one seems to be set to: 
>D:/Programme/Microsoft Visual Studio 8/VC/bin/cl.exe 
>So I'd go with  
>IF(CMAKE_C_COMPILER MATCHES "cl\\.exe") 
>Why did you actually enclose the CMAKE_C_COMPILER in "..." ? 
> 
>See here: 
>http://lists.kde.org/?l=kde-core-devel&m=113854399503911&w=2 
> 
>This has been generated using this script:
>
>http://websvn.kde.org/trunk/KDE/kdelibs/cmake/systeminfo/CMakeLists.txt?rev=503587&view=auto
>
>  
>  
>
>>>Or how about adding a "MSVC" to the list above ?  
>>>      
>>>
>> 
>>There needs to be a whole compiler id step added to do this right.  It  
>>can probably be integrated with the checks for a working compiler, but  
>>this has not yet been done.  It's been on my to-do list for a long 
>>time. 
>>    
>>
> 
>Can they simply be added to the files in Modules/Platforms/ ? 
> 
>Bye 
>Alex 
> 
>
>  
>