Tracking LLVM #46176

[alexreinking]

LLVM has a crash on Windows x86-Debug. This blocks us from issuing a binary release on that platform. Opening this issue to track updates to that bug.

https://bugs.llvm.org/show_bug.cgi?id=46176

[alexreinking]

Craig Topper replied with an objection to the repro, but applying his patch had no effect. I replied with this result and a reference to the LLVM code from which the reproducer was derived.

[alexreinking]

Reid Kleckner reproduced the error and found it is likely an MSVC compiler bug.

https://developercommunity.visualstudio.com/content/problem/1179643/msvc-copies-overaligned-non-trivially-copyable-par.html

[abadams]

I love this. We can't compile because there's a bug in the compiler that compiles the compiler we built our compiler on.

[alexreinking]

MSVC confirmed the compiler bug and will ship a fix in the next release.

https://developercommunity2.visualstudio.com/t/msvc-copies-overaligned-non-trivially-copyable-par/1179643?from=email&viewtype=all#T-N1234878

[alexreinking]

We're working around this on buildbots now and it's fixed in LLVM trunk anyway. Closing.

[alexreinking]

This compiler bug was reported fixed on Mar 02, 2021 -- https://developercommunity2.visualstudio.com/t/Incorrect-Code-Gen--Missing-Error/831543