[CMake] Dependencies and libraries..How does it work?

[David Springate]

Hi Andreas,

Thanks for another reply!

My question therefore is:
How can the cmake for MY_APP start the cmake for MY_LIB?

I know how to get my app to link a library, and how to add the include
directories for the lib - so that the app can compile - but how can it
kick-start the build for MY_LIB so that the library is guaranteed to exist
ready to be linked? I don't want to use an external script as I'd have to
have one for each platform - going against the point of cmake, surely?

Thanks again for your help so far,

David

On 17 June 2011 10:22, Andreas Naumann <Andreas-Naumann at gmx.net> wrote:

> **
> Hi,
>
> how should cmake find your MY_LIB-directory?
> The simplest way, is to add the directory using
> "add_subdirectory(MY_LIB_DIR ...)"
>
> If the MY_LIB-build directory is somewhere else, in a completely different
> directory, you should think about your project structure.
>
> Andreas
>
> Am 17.06.2011 11:06, schrieb David Springate:
>
> Hi,
>
> Thanks for the reply - but I think you might have misunderstood my
> question.
>
> I want to setup CMake so that when I call Cmake like so (for MY_APP):
> mkdir build && cd build
> cmake .. -G Xcode
>
> that the cmake call will be able to 'know' that it needs MY_LIB, find where
> the MY_LIB CMakeLists.txt file is, build it, and then continue with the
> cmake call for MY_APP.
>
> Any ideas?
>
> David
>
> On 17 June 2011 08:18, J.S. van Bethlehem <j.s.van.bethlehem at astro.rug.nl>wrote:
>
>> Hej David,
>>
>> >From your description I think all your build script needs to do is:
>>
>> mkdir build && cd build
>> cmake ..
>> make MY_APP
>>
>> Further, assuming your library also gets build with CMake, you probably
>> have an add_directory(../MY_LIB ../MY_LIB) in your main lists-file
>> (otherwise you should) and then the link_directories() command is not
>> needed. I created sort of a 'standard' machinery for building a list of
>> 'sub-packages' using CMake. It's not well documented and probably still has
>> many issues, but I could mail it to you if you think it may help you get
>> started and if you're interested.
>>
>> Greetsz,
>> Jakob
>>
>> On 06/16/2011 11:54 PM, David Springate wrote:
>>
>>> Hi,
>>>
>>> I am new to CMake - and whilst I am immediately impressed with it's
>>> relative ease of use - I have a 'noob' question, I'm sure!
>>>
>>> I have the following:
>>> A library called MY_LIB that builds with a cmake command (I have created
>>> a nice CMakeLists.txt file)
>>> An application called MY_APP that builds a nice application - and even
>>> links in MY_LIB using:
>>> link_directories("../MY_LIB")
>>> target_link_libraries(MY_APP MY_LIB)
>>>
>>> Now, first of all I know that I'm not supposed to use relative paths..
>>> but we'll call a side issue.. (though I'd be happy to hear the correct way
>>> of doing things!) - the real problem that I have is this:
>>>
>>> Give than MY_LIB is built using CMake and MY_APP is built using CMake..
>>> how can I setup my build scripts so that I can call CMake once for MY_APP,
>>> it'll realise that it needs MY_LIB, which hasn't yet been built, invoke
>>> CMake for MY_LIB and then link itself with MY_APP?
>>>
>>> I ask because I use libraries heavily to organise my code (and reuse) and
>>> would love to switch to CMake for all my building (XCode 4 has forced my
>>> hand!) but I can't seem to figure this out.
>>>
>>> Please help a newcomer out - any help is greatly appreciated!
>>>
>>> Thanks,
>>>
>>> David
>>>
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>
>
>
> --
> David Springate
> david.springate at gmail.com
>
>
> _______________________________________________
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>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
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>
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>
>
> _______________________________________________
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>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
>
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-- 
David Springate
david.springate at gmail.com
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