[LLVMdev] does ENABLE_COVERAGE work?

[John Regehr]

Thanks Eric, I'm trying this out now!

John


On Tue, 17 Jun 2014, Eric Christopher wrote:

> On Tue, Jun 17, 2014 at 12:48 PM, John Regehr <regehr at cs.utah.edu> wrote:
>> Hi,
>>
>> I'd like to see what parts of LLVM/Clang are being executed.
>>
>> I know that "make ENABLE_COVERAGE=1" used to just work, but so far (on
>> 64-bit Ubuntu 14.04) I've had no luck building either 3.4.x or SVN head
>> using any of Clang 3.4, Clang head, or a recent GCC.
>>
>> The first error that I get when building with GCC is this:
>>
>> /home/regehr/tmp/llvm/utils/FileCheck/FileCheck.cpp:1304: error: undefined
>> reference to '__gcov_init'
>>
>> The first error that I get when building with Clang 3.4.2 is this:
>>
>> /home/regehr/tmp/llvm/build/utils/FileCheck/Debug+Coverage+Asserts/FileCheck.o:/home/regehr/tmp/llvm/utils/FileCheck/FileCheck.cpp:function
>> __llvm_gcov_writeout: error: undefined reference to 'llvm_gcda_start_file'
>>
>> Is this expected to work?  Am I missing something obvious?
>>
>
> Yes, and no. :)
>
> I fixed at least the linking problem here:
>
> Committing to https://llvm.org/svn/llvm-project/llvm/trunk ...
> M Makefile.rules
> Committed r211131
>
> The build is still going on so I can't test whether or not the
> instrumented code is actually producing gcov notes, but it is taking
> forever to run clang when building compiler-rt ;)
>
> -eric
>