[Bug 258954] java/openjdk11 java/openjdk12 java/openjdk13: crashes when built with clang 13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258954

Dimitry Andric <dim@FreeBSD.org> changed:

           What    |Removed                     |Added
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           Assignee|java@FreeBSD.org            |dim@FreeBSD.org
             Status|New                         |Open

--- Comment #1 from Dimitry Andric <dim@FreeBSD.org> ---
Created attachment 228727
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=228727&action=edit
java/openjdk{8,11,12,13}: work around UB in markOopDesc

Unless there is a strong objection, I will commit the attached patch soon,
probably during the weekend.

Since the patches committed upstream for
https://bugs.openjdk.java.net/browse/JDK-8229258 are tricky to backport to
OpenJDK 8, 11, 12 and 13, the safest workaround is to force use of clang12 from
the devel/llvm12 port, iff the system compiler is 13.0.0.

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