[cfe-dev] Midterm report - Enabling llvm’s self-hosted modules builds using libstdc++

[Bianca-Cristina Cristescu via cfe-dev]

Hi,

This is the midterm evaluation for the project: Enabling llvm’s self-hosted
modules builds using libstdc++ [1]

Following the project plan, a buildbot [2] for building llvm with
self-hosted modules using libstdc++ has been set up on zorg. The
configuration patches [3] have been committed to zorg and the builedbot is
running on Debian using gcc 4.7. It currently builds up to 9%.

A number of issues/bugs have been encountered while building llvm
self-hosted with modules using libstdc++. Some issues appeared uniquely,
whereas some are recurrent. C-reduce [4] has been set up in order to
accelerate the process of reducing the issues and where feasible a
combination of c-reduce and manual reduction has been used to achieve
minimalistic reproducers. The minimised bugs have been submitted to
Bugzilla along with the reproducers in the form of a clang test.
[5][6][7][8].

Some of the submitted bugs have either been fixed by clang developers, have
patches submitted to Phabricator or are pending. The patches that I
submitted to Phabricator [9][10][11][12] are fixing the corresponding bugs
in Bugzilla or they are fixing other minor issues with the module maps or
missing includes. Some of the submitted bugs are valid bugs not only for
the modules component, but as well for non-modules clang (i.e [6]).

Any questions or suggestions are welcomed!


Cheers,

Cristina

[1]
https://summerofcode.withgoogle.com/dashboard/project/4949415424950272/details/

[2] http://lab.llvm.org:8011/builders/clang-x86_64-linux-selfhost-modules-2/

[3]  http://llvm.org/viewvc/llvm-project/zorg/trunk/buildbot/

[4]  https://embed.cs.utah.edu/creduce/

[5] https://llvm.org/bugs/show_bug.cgi?id=27698

[6] https://llvm.org/bugs/show_bug.cgi?id=27699

[7] https://llvm.org/bugs/show_bug.cgi?id=27890

[8] https://llvm.org/bugs/show_bug.cgi?id=27991

[9] http://reviews.llvm.org/D21390

[10] http://reviews.llvm.org/D21388

[11] http://reviews.llvm.org/D20244

[12] http://reviews.llvm.org/D19315
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