[llvm-bugs] [Bug 26534] New: Link error on null result from getScope

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26534

            Bug ID: 26534
           Summary: Link error on null result from getScope
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-link
          Assignee: unassignedbugs at nondot.org
          Reporter: alonzakai at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

On line 1238 of IRMover.cpp,

 if (auto *SP = getDISubprogram(dyn_cast<MDNode>(IE->getScope())))

I have seen a testcase where the dyn_cast fails as it receives a null pointer.
I don't understand this code enough to know if the fix is dyn_cast_or_null or
not.

I'm afraid the testcase I have is rather large. It's in the files provided in
this bugreport,

https://github.com/kripken/emscripten/issues/4078#issuecomment-180755159

And the steps to reproduce are to run

llvm-link libvsomeip.so -o linked.so

Stripping debug info and then linking avoids the problem, further confirming
it's a debuginfo issue.

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