Code Coverage Compile Issue LLVM 10

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1

Hello,

I recently updated LLVM from version 6.0.0 to 10.0.0.

I see the following issue when I compile an application only with code coverage compiler options. Thes issue does not appear in any other build type.

*…:(_llvm_prf_data[profv**ZNK4llvm3cfg6UpdateIPNS10BasicBlockEE4dumpEv]+0x18): undefined reference to `llvm::cfg::Update<llvm::_BasicBlock>::dump() const’_

I see this issue only when I compile the app with the following compiler options:

-g -O2 -fprofile-instr-generate -fcoverage-mapping

I don’t use any special flags when I build LLVM. I used g+±7 (or clang+±9) to compile LLVM static libs. The issue does not appear with LLVM 6.0.0.

I included all LLVM libraries in the same order whatever llvm-config --libs outputs.

What lib am I missing? Or is this a known issue?

Thank you,
Aaron

2

llvm::cfg::Update<llvm::**BasicBlock*>::dump() is guarded by !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)

I cannot find anywhere it is referenced.
It seems that you call this function but do not provide the definition.

3

Thank you for your response. I don’t use any “::dump()” method in my application.

I found that removing compiler optimization parameter “-O2” resolved the issue. Any optimization parameter, such O1, O2 or O3 causes the same issue, not sure why.

Any ideas?