Re: Transitioning Ceph from Autotools to CMake

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Dear Ali,

I am glad you are making progress.

Sadly I don't yet know cmake.

Please consider the systemd wip branch. It might be wise to leave
autotools around a little longer, until all functionality is in the cmake.

Best regards

Owen


On 07/30/2015 09:01 PM, Ali Maredia wrote:
> After discussing with several other Ceph developers and Sage, I wanted
> to start a discussion about making CMake the primary build system for Ceph.
> 
> CMake works just fine as it is (make -j4 on master with CMake builds
> 350% faster than autotools!), but there's more work needed to make it 
> into a first-class build system.
> 
> Short term (1-2 weeks):
>  - Making sure CMake works on all supported platforms: Centos7, RHEL7,
>    Ubuntu 14.04 & 12.04, Fedora 22, Debian Jessie, Debian Wheezy are the
>    target platforms I have noted to test on already.
>  - Adding a target similar to make check
>  - Creating CMake targets that build packages (such as for rpm or debian)
>  - Writing documentation for those who haven't used CMake before to smooth the
>    transition over
>  - Making sure no targets or dependencies are missing from the
>    current CMake build, and that CMake supports all current 
>    targets, configurations and options
>  - Replacing the integration autotools has with any automated build/test
>    systems such as the gitbuilder
> 
> Longer term (2-4 weeks):
>  - Removing the current autotools files, to avoid doubling build system
>    workload
>  - Adding more but shorter CMakeLists.txt files to a tree like structure
>    where a CMakeLists.txt would be in every subdirectory
>  
> I'm already working on a target similar to the make check target, and plan
> on working on the other short term goals over the next weeks and beyond.
> 
> I wanted to get feedback from the community any reasons why someone started using 
> CMake but stopped (ex: lack of functionality), and more broadly, on what other 
> obstacles there might be for the transition.
> 
> -Ali
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