[llvm-bugs] [Bug 30248] New: [ThinLTO] Assertion `(!*MappedOp || M.getVM().count(CMD->getValue()) || M.getVM().getMappedMD(Op)) && "Expected Value to be memoized"' failed.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30248

            Bug ID: 30248
           Summary: [ThinLTO] Assertion `(!*MappedOp ||
                    M.getVM().count(CMD->getValue()) ||
                    M.getVM().getMappedMD(Op)) && "Expected Value to be
                    memoized"' failed.
           Product: lld
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: twoh at fb.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17201
  --> https://llvm.org/bugs/attachment.cgi?id=17201&action=edit
source file

repro:

clang++ -g2 -std=c++11 -flto=thin -c -o main.o main.cpp
clang++ -g2 -std=c++11 -flto=thin -c -o dst.o dst.cpp
clang++ -g2 -std=c++11 -flto=thin -c -o src.o src.cpp
clang++ -o /dev/null -B/usr/local/bin/gold -flto=thin main.o dst.o src.o

ld: /data/users/twoh/llvms/svn/llvm/lib/Transforms/Utils/ValueMapper.cpp:525:
llvm::Optional<llvm::Metadata*>
{anonymous}::MDNodeMapper::tryToMapOperand(const llvm::Metadata*): Assertion
`(!*MappedOp || M.getVM().count(CMD->getValue()) || M.getVM().getMappedMD(Op))
&& "Expected Value to be memoized"' failed.
clang-4.0: error: unable to execute command: Aborted (core dumped)
clang-4.0: error: linker command failed due to signal (use -v to see
invocation)

Tested with revision 280435

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