[CMake] Suggestion for CMake platform/compiler detection

[Alexander Neundorf]

Hi Tanguy,

Von: Tanguy Krotoff <tanguy.krotoff at wengo.fr>

so did OpenWengo now officially switch to CMake ?

> Hi
> 
> Cmake supports several boolean for platform/compiler detection:
> UNIX
> APPLE
> WIN32
> CYGWIN
> MINGW
> BORLAND
> 
> I think this approach is too simple and not very easy for the developer.
> 
> What about code that I want to compile under Windows using Borland, 
> Intel, MinGW and MSVC?
> What about code compiled under Cygwin? IF (UNIX) is true or not?
> What about Intel compiler under UNIX?
> 
> A good and simple approach is to totally separate platform OS detection 
> >from compiler detection.
> 
> I see something like this:
> 
> Operating systems:
> - OS_WINDOWS
>    - OS_WIN32
...
> Compilers:
> - CC_MSVC (Microsoft Visual C++)
>    - CC_MSVC6 (Visual C++ 6)
...
> 
> Qt as the same approach and I think Qt is a good example of a massively 
> multiplatform tool.
> 
> See qglobal.h at:
> http://doc.trolltech.com/3.3/qglobal-h.html
> 
> It would be good for CMake to have the same separation between OS and 
> compiler detection, what do you think?

CMake has some of that.
It has for OS:
UNIX
APPLE
WIN32
CYGWIN
MINGW


And for the compilers:
Not sure it has GCC, but at least it has CMAKE_COMPILER_IS_GNUCXX
BORLAND
MSVC
For the Intel Compiler in KDE we currently check using 
if(CMAKE_C_COMPILER MATCHES "icc")

So there is room for improvement. 
I think mainly some of the cmake files in Modules/ and Modules/Platforms/ would have to be extended. For compatibility reasons I'm not sure new prefixes like "OS_" and "CC_" would be a good idea.

You know already which sentence follows next... ;-)
Feel free to send a patch :-)

Bye
Alex

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