[LLVMdev] Building the fuzzer library

[Justin Bogner]

Yeah, I figured this out eventually. The problem was that because of
pr23604 I had to turn off -Werror, so I missed the warnings that make
what was going wrong obvious.

Thanks!

Kostya Serebryany <kcc at google.com> writes:
> [sorry, missed the message]
>
> You need both -DLLVM_USE_SANITIZE_COVERAGE=ON and -DLLVM_USE_SANITIZER=
> Address. 
> http://llvm.org/docs/LibFuzzer.html should be up-to-date. 
> http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fuzzer is running it
> 24/7 and is green. 
>
> --kcc
>
> On Sat, May 16, 2015 at 5:43 PM, Justin Bogner <mail at justinbogner.com> wrote:
>
>     I decided to try out the fuzzer library and clang-fuzzer, but it doesn't
>     seem to build for me. From the cmake files, I was pretty sure all I need
>     to do is set -DLLVM_USE_SANITIZE_COVERAGE=ON, but with this I get a
>     number of link errors for "lib/Fuzzer/test/LLVMFuzzer-CounterTest", for
>     example:
>    
>       lib/libLLVMFuzzer.a(FuzzerLoop.cpp.o): In function `SetDeathCallback':
>       /home/bogner/code/llvm/lib/Fuzzer/FuzzerLoop.cpp:31: undefined reference
>     to `__sanitizer_set_death_callback'
>       lib/libLLVMFuzzer.a(FuzzerLoop.cpp.o): In function
>     `fuzzer::Fuzzer::SetDeathCallback()':
>       /home/bogner/code/llvm/lib/Fuzzer/FuzzerLoop.cpp:31: undefined reference
>     to `__sanitizer_set_death_callback'
>       lib/libLLVMFuzzer.a(FuzzerLoop.cpp.o): In function
>     `RunOneMaximizeFullCoverageSet':
>       /home/bogner/code/llvm/lib/Fuzzer/FuzzerLoop.cpp:236: undefined
>     reference to `__sanitizer_reset_coverage'
>       /home/bogner/code/llvm/lib/Fuzzer/FuzzerLoop.cpp:239: undefined
>     reference to `__sanitizer_get_coverage_guards'
>    
>     Is there something I'm missing? Has this broken recently? Is there
>     something wrong with my system?