[CMake] What does `cross-platform' mean?

[Bill Hoffman]

Mathias Fröhlich wrote:
> Hi,
> 
> On Monday 10 November 2008 16:29, Bill Hoffman wrote:
>> Can you describe exactly what you think autotools does here?   I guess
>> most autotools tests use a try-compile to find a library.  Is that what
>> you are referring to?
> Yep.
> If you want to link with a library you need to test if you can link with that 
> library.
> If you test something different, you might then later be surprised, that 
> linking does not work ...
> ... and yes this takes more time than just testing for existence. But it is 
> way more correct ...
> 

OK, so perhaps the FindFoo.cmake modules should always use a try-compile 
to test the library that is found works with the current ABI.   This 
will likely slow things down quite a bit...   This would require some 
extra thought....   Perhaps the abi can be determined without a 
try-compile, but I am not sure that would work on all platforms.

-Bill