llvm dev - Mar 2013 - [LLVMdev] undefined reference to 'llvm_gcda_start_file', 'llvm_gcda_emit_arcs', etc

Hi,
I am trying to test my project and get the code coverage with a version of
clang compiler that was built from the latest llvm/clang codebase.

It worked for a while. But today, after I updated my local checkout, and
re-build llvm, clang and compiler-rt, when I test my project again, I got
the errors with undefined reference to 'llvm_gcda_start_file',
'llvm_gcda_emit_arcs', 'llvm_gcda_emit_function', and
'llvm_gcda_end_file'.

I have searched the codebase, and have found the functions are defined in
GCDAProfiling.c file, but not sure why this suddenly doesn't work for me.

Anyone can give any suggestions?

Thanks very much in advance.
Qun
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On Mar 13, 2013, at 6:06 PM, Qun Fa <testforqunfa at gmail.com> wrote:
> Hi,
> I am trying to test my project and get the code coverage with a version of
clang compiler that was built from the latest llvm/clang codebase.
> 
> It worked for a while. But today, after I updated my local checkout, and
re-build llvm, clang and compiler-rt, when I test my project again, I got the
errors with undefined reference to 'llvm_gcda_start_file',
'llvm_gcda_emit_arcs', 'llvm_gcda_emit_function', and
'llvm_gcda_end_file'.
> 
> I have searched the codebase, and have found the functions are defined in
GCDAProfiling.c file, but not sure why this suddenly doesn't work for me.
> 
> Anyone can give any suggestions?
> 
Hi Qun,

The 'runtime' recently removed these. You'll need to download and
build compiler-rt. Put it in the 'projects' directory and it should just
build when you compile LLVM.

-bw

Qun Fa wrote:
> Hi,
> I am trying to test my project and get the code coverage with a version
> of clang compiler that was built from the latest llvm/clang codebase.
>
> It worked for a while. But today, after I updated my local checkout, and
> re-build llvm, clang and compiler-rt, when I test my project again, I
> got the errors with undefined reference to 'llvm_gcda_start_file',
> 'llvm_gcda_emit_arcs', 'llvm_gcda_emit_function', and
'llvm_gcda_end_file'.
>
> I have searched the codebase, and have found the functions are defined
> in GCDAProfiling.c file, but not sure why this suddenly doesn't work
for me.
>
> Anyone can give any suggestions?
Those symbols should be provided by 
compiler-rt/lib/profile/GCDAProfiling.c. There used to be a copy in 
llvm's tree, but I deleted that one recently. It's possible you used to 
be using the one from llvm, but now need to switch to using the one from 
compiler-rt?

Nick

Thanks for your reply.

May I know which is the recommended library that should be linked against?

I am currently linking libprofile_rt.a.

And I have noticed the differences that, if we do

`nm libprofile_rt.a | grep llvm`

with my old copy of the llvm/clang installation, I can see

00000000000005e0 T _llvm_gcda_emit_arcs
0000000000000b48 S _llvm_gcda_emit_arcs.eh
0000000000000430 T _llvm_gcda_emit_function
0000000000000aa8 S _llvm_gcda_emit_function.eh
00000000000006c0 T _llvm_gcda_end_file
0000000000000b98 S _llvm_gcda_end_file.eh
00000000000003d0 T _llvm_gcda_increment_indirect_counter
0000000000000a80 S _llvm_gcda_increment_indirect_counter.eh
0000000000000000 T _llvm_gcda_start_file
0000000000000a08 S _llvm_gcda_start_file.eh

They are the symbols that my test build is looking for.

But with the latest codebase, here is what I saw

00000000000000a8 T llvm_start_basic_block_tracing
0000000000000067 T llvm_trace_basic_block
0000000000000467 T llvm_decrement_path_count
000000000000042a T llvm_increment_path_count
0000000000000662 T llvm_start_path_profiling
0000000000000020 T llvm_start_edge_profiling
0000000000000020 T llvm_start_opt_edge_profiling

Thanks again,
Qun

On Thu, Mar 14, 2013 at 1:11 AM, Nick Lewycky <nicholas at mxc.ca> wrote:
> Qun Fa wrote:
>
>> Hi,
>> I am trying to test my project and get the code coverage with a version
>> of clang compiler that was built from the latest llvm/clang codebase.
>>
>> It worked for a while. But today, after I updated my local checkout,
and
>> re-build llvm, clang and compiler-rt, when I test my project again, I
>> got the errors with undefined reference to
'llvm_gcda_start_file',
>> 'llvm_gcda_emit_arcs', 'llvm_gcda_emit_function', and
>> 'llvm_gcda_end_file'.
>>
>> I have searched the codebase, and have found the functions are defined
>> in GCDAProfiling.c file, but not sure why this suddenly doesn't
work for
>> me.
>>
>> Anyone can give any suggestions?
>>
>
> Those symbols should be provided by
compiler-rt/lib/profile/**GCDAProfiling.c.
> There used to be a copy in llvm's tree, but I deleted that one
recently.
> It's possible you used to be using the one from llvm, but now need to
> switch to using the one from compiler-rt?
>
> Nick
>
>
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