llvm dev - Sep 2020 - Code Coverage Compile Issue LLVM 10

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
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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.

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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