[webkit-dev] CMake vs. Apple's build farm

Bradley Nelson bradnelson at google.com
Tue Apr 20 10:06:43 PDT 2010

Would prebuilt checked-in binaries be an option? Can cmake run out of an
arbitrary directory?


On Tue, Apr 20, 2010 at 5:25 AM, Bill Hoffman <bill.hoffman at kitware.com>wrote:

> On 4/20/2010 5:13 AM, Maciej Stachowiak wrote:
>  1) None of the Mac builders have CMake installed.
>> 2) The organization that maintains the Mac builders is not willing to
>> let teams use any build systems to build that do not come with the OS,
>> or to install any custom binaries on the builders, because builds need
>> to be reproducible.
> So, long term is there a way for CMake to come with the OS?  I mean gmake
> is part of the OS, python seems to be OK, how does a tool get promoted to
> such a level?
>  3) CMake is not part of the standard Mac OS X install for any shipping
>> version of Mac OS X.
>> 4) LLVM compiles using a separate Makefile-based (and apparently
>> autoconf and autogen based) build system in OS builds.
>> 5) LLVM uses CMake to build on Windows.
>> 6) The build organization is more willing to install custom tools on
>> Windows builders.
>> I think this rules out using CMake to build the mac port. Even if we got
>> it set up, we'd need to maintain some kind of parallel build system for
>> production builds via the build farm, which would negate the benefit. It
>> might be possible to use CMake for Apple's Windows port, but if we
>> switch away from native project formats at all, ideally we'd like to
>> switch both ports to the same build system.
> I am wondering if you could include the sources to CMake inside the source
> tree for the Mac build farms.  CMake really only depends on the C++
> compiler, and that is part of the OS.  You could use CMake's bootstrap
> script to build it.   Then run that CMake to generate the build.  I could
> help you create a lean CMake that would only build the features used for the
> build of WebKit.
>> Since gyp does not require any special software to be installed merely
>> to build, it seems like a more plausible option at the moment.
>  Note: this is not to hate on CMake, I just don't want to end up in a
>> position where we have to maintain two parallel build systems for the
>> Mac port, or fight with other organizations about the operation of the
>> build farm. Requiring CMake to be installed at build time seems like a
>> showstopper from that point of view.
>>  So, rather than install one program, Apple would rather have one of its
> developers maintain a forked build system.  I would of course like to see
> this change.   I would think it would be possible to change this. I suppose
> if enough tools that Apple uses move to CMake, it would become OK.  Anyway,
> what do think about building CMake with the project?
> -Bill
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