[lldb-dev] Questions about the LLDB testsuite and improving its reliability

Zachary Turner via lldb-dev lldb-dev at lists.llvm.org
Wed Jan 17 15:47:09 PST 2018

On Wed, Jan 17, 2018 at 3:39 PM Adrian Prantl <aprantl at apple.com> wrote:

> On Jan 17, 2018, at 3:25 PM, Zachary Turner <zturner at google.com> wrote:
> I don't know what would be involved in getting the tests building out of
> tree with Make.  But I do know it would be simple with CMake.  I'm sure
> it's probably not terrible with Make either, I just don't know enough about
> it to say.
> One thing that I do like about CMake is that it can be integrated into the
> existing LLDB build configuration step, which already uses CMake, to build
> inferiors up front.  This has the potential to speed up the test suite by
> an order of magnitude.
> Since the tests in the LLDB testsuite are typically very small and don't
> import a lot of headers I'm not convinced that an incremental build of the
> tests will have a very big impact on the running time of the testsuite, but
> to be honest I also haven't benchmarked it to see where the time is really
> spent.

It actually is pretty significant.  Part of this is due to the fact that a
single .py file has multiple tests, and the compile happens for every one
of those tests, even though it just produces the exact same output every
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