[CMake] Accessing Variables from within a *.cmake file

[Hashim Mir]

Nope, I am not running it with -P.

My BuildSetup.cmake sets the flags that are passed in to the compiler 
ex: set(CMAKE_CXX_FLAGS ...)

-----Original Message-----
From: David Cole [mailto:david.cole at kitware.com] 
Sent: February-23-12 11:45 AM
To: Hashim Mir
Cc: John Drescher; cmake at cmake.org
Subject: Re: [CMake] Accessing Variables from within a *.cmake file

On Thu, Feb 23, 2012 at 10:58 AM, Hashim Mir <hmir at rim.com> wrote:
> There is a PROJECT() at the top of my CMakeLists.txt file.
>
> However, I am trying to access the variable from within my BuildSetup.cmake file, so it is considered even before the CMakeLists.txt file.
>
> -----Original Message-----
> From: John Drescher [mailto:drescherjm at gmail.com]
> Sent: February-23-12 10:48 AM
> To: Hashim Mir
> Cc: cmake at cmake.org
> Subject: Re: [CMake] Accessing Variables from within a *.cmake file
>
> On Thu, Feb 23, 2012 at 10:39 AM, Hashim Mir <hmir at rim.com> wrote:
>> Hi,
>>
>>
>> I am trying to control the flow of my program based on the value of a 
>> cmake variable called CMAKE_SIZEOF_VOID_P.
>>
>>
>>
>> To start off, I wanted to just see what value this variable took 
>> under multiple different configurations, by issuing the following 
>> command in my cmakelists.txt file:
>>
>>
>>
>> message(${CMAKE_SIZEOF_VOID_P})
>>
>>
>>
>> This works perfectly. However, whenever I try to run the above 
>> command on my *.cmake file, I get no value returned to me (it just throws an error).
>>
>
> Is there a PROJECT()
>
> before you include your .cmake
>
> John
>
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Are you running it with "cmake -P" ?

If so, the variable CMAKE_SIZEOF_VOID_P is not defined, unless you define it yourself, and pass it in using -D when you call the -P script.

It is only defined after enabling the C or CXX language (which is a side effect of the project command) during a CMake configure run.

What does BuildSetup.cmake do?


HTH,
David

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