[cfe-dev] [LLVMdev] Using CMake/Ninja on buildbots
tobias at grosser.es
Wed Feb 6 14:07:39 PST 2013
On 02/06/2013 10:41 PM, Renato Golin wrote:
> Hi all,
> A discussion was being carried on llvmcommits about the extra time for
> cleaning and re-building objects that didn't need to be built on buildbots.
> Since they just update the repository, builds could be a lot faster if
> we let the objects in place. Even faster if we used Ninja with CMake. Is
> there a crucial reason why we're still using autoconf for all builds?
> Some of us acknowledge that sometimes the build gets stuck because of a
> CMake file problem or change that the build can't get around
> automatically. It's probably because of those issues that a "make clean"
> is done on almost all buildbots.
I am running the Polly buildbot which seems to be the only one that uses
cmake. I have never seen any build being stuck. cmake failures reported
by the polly bot are normally due to cmake config files that have not
properly being updated.
> The point is that, for the exception, we're paying it in full, every
> single build. Some of us proposed, then, that we could not have the
> clean phase on buildbots in the first place, and deal with the
> exceptions when they happen. Does that sound terrible to anyone?
I believe the clean phase is mainly to catch buildsystem problems that
only arise in a clean build. I agree that in a phased build the very
first build could run without the clean phase to get fast results. For
not that time critical builds, builds that include the clean phase are
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