[CMake] cmake 2.6.0, breakages

[Bill Hoffman]

Dmitry Marakasov wrote:
> * Andreas Pakulat (apaku at gmx.de) wrote:
> 
>>> sdl-config --libs:
>>> -L/usr/local/lib -Wl,-rpath,/usr/local/lib -lSDL -pthread
>>> sdl-config --cflags:
>>> -I/usr/local/include/SDL -I/usr/local/include -D_GNU_SOURCE=1 -D_REENTRANT
>>>
>>> So I thought it would be safer to use sdl-config and let user specify
>>> path to in if it's not in $PATH.
>> Not really, because you're basically just using CMake as "another" way
>> of passing arguments to the compiler.
> True, but it's often convinient to use CMake this way. While I
> understand that CMake's goal is to be cross-platform build tool, 
> support for just passing whatever (`foobar --args`, -Wl etc.) to
> compiler/linker is still nice for local usage. I'm not aware on
> official cmake team politics here though, as not permitting to do
> this stuff also has it's beneits (i.e. to avoid breakages as in my
> case).


The problem is that it will not work with all generators.  For example 
Xcode can not run stuff like that because it is not using the shell. 
Same goes for Visual Studio and future IDE projects.  Also injecting 
stuff into the link process hides it from CMake, so it is not able to 
process that information and do things like order link libraries and 
modify flags for what ever reason might be needed.  So, in some versions 
of CMake this worked as a fluke, but it will not be supported in the 
future.   The big change that happened is that CMake now uses a link 
file to be able to handle broken shells that have command line 
limitations.  So, the link line does not even get processed by the shell 
anymore.

-Bill