[llvm-dev] LibFuzzer and platforms availability

[AlexDenisov via llvm-dev]

That’s great, thank you for patch.

> r247321 refactors the code so that it should build on Mac.
> I haven't actually tested it on Mac -- so please help me and send follow up patches if needed.


I can confirm that first example worked as expected (with some additions: '-I path_to_compiler_rt/include' when build LibFuzzer and ‘-lclang_rt.asan_osx_dynamic -L path_to_libs/clang/3.8.0/lib/darwin’).

> check-fuzzer will still fail because some of the libFuzzer tests require dfsan.

make doesn’t see check-fuzzer rule, seems it’s disabled somewhere in CMakeLists, I’m going to investigate.

> I'll try to commit such patches later this week, but I don't have a Mac so it will be harder for me to test.

Please, don’t hesitate to CC me and I’ll run tests on my machine.

> If anyone wants it quicker -- patches are welcome.

I’d be happy to send them, but I know nothing about LibFuzzer internals :)
--
AlexDenisov
Software Engineer, http://lowlevelbits.org

> On 10 Sep 2015, at 20:52, Kostya Serebryany <kcc at google.com> wrote:
> 
> r247321 refactors the code so that it should build on Mac.
> I haven't actually tested it on Mac -- so please help me and send follow up patches if needed.
> 
> check-fuzzer will still fail because some of the libFuzzer tests require dfsan.
> I'd use some help from someone with a Mac to modify lib/Fuzzer/test/CMakeLists.txt so that it does not run dfsan-dependent tests on Mac.
> 
> Thanks,
> 
> --kcc
> 
> On Wed, Sep 9, 2015 at 9:41 AM, Kostya Serebryany <kcc at google.com> wrote:
> 
> 
> On Wed, Sep 9, 2015 at 12:57 AM, AlexDenisov via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> Hi there.
> 
> I’m trying to use LibFuzzer on OSX and face some issues:
> I checked out LibFuzzer documentation[1] and managed to proceed until the final step of the first example.
> Now I see linker errors related to dfsan, dfsan’s documentation[2] states explicitly “DataFlowSanitizer is a work in progress, currently under development for x86_64 Linux.”.
> 
> Yes, libFuzzer does not build on OSX today.
> Marshall (CC-ed) has managed to make it work with a couple of #ifdefs in FuzzerTraceState.cpp.
> 
> I'll try to commit such patches later this week, but I don't have a Mac so it will be harder for me to test.
> If anyone wants it quicker -- patches are welcome.
> I would also appreciate if someone can set up a build bot for libFuzzer on Mac :)
> (similar to lab.llvm.org:8011/builders/sanitizer-x86_64-linux-fuzzer)
> 
> 
> Does it mean that LibFuzzer available only on Linux platform? Can somebody confirm or refute my conclusion?
> 
> [1] http://llvm.org/docs/LibFuzzer.html
> [2] http://clang.llvm.org/docs/DataFlowSanitizer.html
> --
> AlexDenisov
> Software Engineer, http://lowlevelbits.org
> 
> 
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