[llvm-dev] Code Coverage Compile Issue LLVM 10

[Aaron via llvm-dev]

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?


On Thu, Sep 10, 2020 at 1:34 PM Fangrui Song <maskray at google.com> wrote:

>
> On 2020-09-09, Aaron via llvm-dev wrote:
> >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__**ZNK4llvm3cfg6UpdateIPNS_**10BasicBlockEE4dumpEv]+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
>
> 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.
>
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