[Bug 277654] lang/ldc: crashes when ports tree has been built by clang 18

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277654

            Bug ID: 277654
           Summary: lang/ldc: crashes when ports tree has been built by
                    clang 18
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: acm@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(acm@FreeBSD.org)
          Assignee: acm@FreeBSD.org

During the exp-run for clang 18 (see bug 276104), one of the failing ports was
lang/ldc. This seems to crash during a bootstrap phase, where the prebuilt ldc2
binary that links against the devel/llvm15 port gets some sort of memory
corruption:

https://pkg-status.freebsd.org/gohan04/data/mainamd64PR276104-default-foo/2024-02-02_20h56m00s/logs/errors/ldc-1.35.0.log

I reported this at https://github.com/ldc-developers/ldc/issues/4593 since I
have very little clue about how ldc works, but from the valgrind traces I can
see that it is involved in corruption of a llvm SmallSet object.

I am making a bug here so it can be tracked in the FreeBSD bugzilla instance,
and I can link it to the exp-run bug.

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