[llvm-bugs] [Bug 49226] New: [lld] Errors about duplicate gcov symbols after 8f91f38

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49226

            Bug ID: 49226
           Summary: [lld] Errors about duplicate gcov symbols after
                    8f91f38
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: ELF
          Assignee: unassignedbugs at nondot.org
          Reporter: dmajor at mozilla.com
                CC: llvm-bugs at lists.llvm.org, mh+llvm at glandium.org,
                    nikita.ppv at gmail.com, smithp352 at googlemail.com
            Blocks: 48902

https://treeherder.mozilla.org/logviewer?job_id=330246994&repo=try&lineNumber=59045

When linking rust code compiled with coverage enabled, we see `error: duplicate
symbol: __gcov_dump` and similar.

Bisection points to 8f91f38 https://reviews.llvm.org/D86142 which is odd
because at first glance I wouldn't think that patch should affect non-fortran.

Should those gcov symbols have been considered mergeable?

Our build setup is pretty complex and I'm still trying to understand the
failure better, but I wanted to report this as early as possible given the
12.0.0 timeline. Right now I only have the CI logs but I'll try reproducing it
locally. If there are any specific pieces of information that I should try to
extract to help people debug this, please let me know.


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=48902
[Bug 48902] [meta] 12.0.0 Release Blockers
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