[llvm-bugs] [Bug 40884] New: [coverage] linker failure with dead code stripping

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40884

            Bug ID: 40884
           Summary: [coverage] linker failure with dead code stripping
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Keywords: compile-fail, miscompilation
          Severity: normal
          Priority: P
         Component: Tooling
          Assignee: unassignedclangbugs at nondot.org
          Reporter: stefan.schmidt-bilkenroth at gemalto.com
                CC: llvm-bugs at lists.llvm.org

This is related to Bug 37561. The bug is fixed now, but I get linker errors
(lld-link) when building teh project with optimizer (for release).

lld-link reports about an error with relocation against "symbol" in discarded
section. This was triggered by a global function calling sprintf(), which was
not referenced. After I removed the function or replaced sprintf() with
snprintf(), linker did not complain, but the unit test was failing.

When building for Debug, the linker also did not complain, the unit test was
passing and I was able to create the coverage report.

Looks to me like dead code stripping is leading to dangling references and also
the Optimizer may cause code corruptions.

I hope Marius can reproduce the issue with his project, as I can hardly share
mine and it comes with a lot of references in our repository.

SSB

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