[llvm-bugs] [Bug 42827] New: clang-9 RC ICE when building clangd with -DLLVM_ENABLE_MODULES=On

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42827

            Bug ID: 42827
           Summary: clang-9 RC ICE when building clangd with
                    -DLLVM_ENABLE_MODULES=On
           Product: clang
           Version: 9.0
          Hardware: All
                OS: All
            Status: NEW
          Severity: release blocker
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: modocache at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk
            Blocks: 42474

Created attachment 22315
  --> https://bugs.llvm.org/attachment.cgi?id=22315&action=edit
A script I used to reproduce the issue. It builds clang, then uses it to
compile clangd with LLVM_ENABLE_MODULES. I also used this script to bisect.

As I explained in my email to llvm-dev on July 29,
http://lists.llvm.org/pipermail/llvm-dev/2019-July/134214.html, I am running
into a Clang ICE when I use a clang-9 built from llvm-project's release/9.x
branch to compile clangd from the release/9.x branch source.

I wrote a script to reproduce the issue, and posted the output from running
that script, in
https://gist.github.com/modocache/ac366ca9673b93bb21e75d3e72162608. I'll also
attach those files to this bug.

I used the script above to bisect, and I found that the first commit that
demonstrates the issue is
https://github.com/llvm/llvm-project/commit/baae41ff76f662987f31447686ba819dcd748b3f.

In the email discussion, I was asked to verify whether the issue reproduces on
llvm-project master. It does for me, and I posted the repro script and its
output to https://gist.github.com/modocache/d9700166067f4a155820bc57d9bee1f3.

However, the issue doesn't appear to occur in buildbots such as
http://green.lab.llvm.org/green/job/clang-stage2-coverage-R/4124/console, which
use -DLLVM_ENABLE_MODULES=On. I can't explain why at the moment.

For now I'm registering this bug as a release blocker for 9.0.0 RC 1, please
let me know if that's appropriate.


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=42474
[Bug 42474] [meta] 9.0.0 Release Blockers
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