[CMake] Xcode and Cmake ReRun

[David Cole]

Sounds like we need a ZERO_CHECK target like we have in the Visual
Studio generators to enable parallel building in Xcode.

There are currently some problems with the existing CMake re-run
commands on VS builds when CMake inputs change during the course of
the build. When that happens, (not something that us CMake devs
expect, by the way, but not forbidden/prevented either...), CMake
re-runs during the middle of the build, and we get all the bug reports
about Visual Studio reload stuff not working (here, and related
issues: http://public.kitware.com/Bug/view.php?id=11258 and
particularly, this note:
http://public.kitware.com/Bug/view.php?id=11440#c26905 )

I don't think there's a specific reason for it... Perhaps it was
simply easiest that way, or we didn't have a way to depend on custom
targets at the time, or it was modeled after the VS re-run rules...
(Or maybe Bill or Brad will chime in if I'm incorrect here...)


HTH,
David


On Mon, Jul 25, 2011 at 5:37 PM, Johan Björk <phb at spotify.com> wrote:
> Hi guys,
>
> I noticed that each XCode target has an associated CMake ReRun script
> phase. Is there a specific reason for this (in difference to having
> one target that all others depend on that does the ReRun check?)
>
> It causes a fair few issues, it fails when you are parallelcompiling
> targets (It'll start <number of cpus> copies of cmake at the same
> time), secondly it adds quite some time to the build if you have many
> targets
> /Johan
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