Re: [CMake] Change project name based on architecture

[Eric Noulard]

2016-11-04 5:06 GMT+01:00 B. Scott Harper :

> I have a project where I manage multiple architectures and switch back and
> forth frequently for testing. Full disclosure, I'm using Visual Studio. And
> since I cannot generate a single solution with multiple architectures (per
> everything I've found searching Google and the mailing list), I have two
> separate solution files (one each for x86 and x64). I often open a solution
> using the recent solutions menu, and it would be a lot easier if I could
> name the solution (cmake's "project()" command) differently for each
> architecture I use.
>
> I tried simply
>
> if(${CMAKE_SIZEOF_VOID_P} EQUAL 8)
> set(PLATFORM_TARGET "x64")
> else()
> set(PLATFORM_TARGET "x86")
> endif()
>
> project(My_Project_${PLATFORM_TARGER})
>
> ...however it seems that CMAKE_SIZEOF_VOID_P isn't filled out until AFTER
> the project command, so I can't use that variable as part of my
> project/solution name.
>

Yes this is a kind of chicken & eggs problem.
The size of VOID_P may not be known before the arch+compiler is known and
for that you need project (+ enable_langage) etc...

Since you already use different CMake generator for your different may be
you can check

CMAKE_GENERATOR
CMAKE_GENERATOR_PLATFORM
CMAKE_GENERATOR_TOOLSET

instead. I guess that those should be (I did not checked) defined before
project command.


> Is there another way to accomplish this? Google only returns documentation
> on the project command in general and the above method seems to be the
> preferred means of detecting build architecture.
>

This is a generator agnostic way to detect 32 vs 64 bits but

You may have a look at CMAKE_SYSTEM_ variables as well, but those may
not be defined before enable language/project command as well.
However CMAKE_GENERATOR_xxx matches should be enough to name your project
properly I guess.
-- 
Eric
-- 

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[CMake] Change project name based on architecture

[B. Scott Harper]

I have a project where I manage multiple architectures and switch back and
forth frequently for testing. Full disclosure, I'm using Visual Studio. And
since I cannot generate a single solution with multiple architectures (per
everything I've found searching Google and the mailing list), I have two
separate solution files (one each for x86 and x64). I often open a solution
using the recent solutions menu, and it would be a lot easier if I could
name the solution (cmake's "project()" command) differently for each
architecture I use.

I tried simply

if(${CMAKE_SIZEOF_VOID_P} EQUAL 8)
set(PLATFORM_TARGET "x64")
else()
set(PLATFORM_TARGET "x86")
endif()

project(My_Project_${PLATFORM_TARGER})

...however it seems that CMAKE_SIZEOF_VOID_P isn't filled out until AFTER
the project command, so I can't use that variable as part of my
project/solution name.

Is there another way to accomplish this? Google only returns documentation
on the project command in general and the above method seems to be the
preferred means of detecting build architecture.

Cheers,
-- Scott
-- 

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http://www.cmake.org/Wiki/CMake_FAQ

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CMake Consulting: http://cmake.org/cmake/help/consulting.html
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