[cfe-dev] AddressSanitizer

[Kostya Serebryany via cfe-dev]

+Vitaly Buka <vitalybuka at google.com> to help with the links to build bots.
Not sure if any of those cover OpenMP.

On Wed, Oct 21, 2020 at 5:50 AM Bryan Chan <bryanpkc at gmail.com> wrote:

> Thanks Kostya, using Clang to build itself with ASan enabled, and running
> my
> build container in privileged mode, helped solve a lot of the problems.
> But I
> now encounter a lot of link errors while testing my stage-2 build:
>
> FAIL: libomp :: api/has_openmp.c (52345 of 54886)
> ******************** TEST 'libomp :: api/has_openmp.c' FAILED
> ********************
> Script:
> --
> : 'RUN': at line 1';   /home/bryanpkc/llvm-project/build/./bin/clang
> -fopenmp -pthread -fno-experimental-isel  -I
> /home/bryanpkc/llvm-project/openmp/runtime/test -I
> /home/bryanpkc/llvm-project/build/projects/openmp/runtime/src -L
> /home/bryanpkc/llvm-project/build/lib  -I /h
> ome/bryanpkc/llvm-project/openmp/runtime/test/ompt
> /home/bryanpkc/llvm-project/openmp/runtime/test/api/has_openmp.c -o
> /home/bryanpkc/llvm-project/build/projects/openmp/runtime/test/api/Output/has_openmp.c.tmp
> -lm -latomic &&
> /home/bryanpkc/llvm-project/build/projects/openmp/runtime/test/api/Output/has_openmp.c.tmp
> --
> Exit Code: 1
>
> Command Output (stdout):
> --
> $ ":" "RUN: at line 1"
> $ "/home/bryanpkc/llvm-project/build/./bin/clang" "-fopenmp" "-pthread"
> "-fno-experimental-isel" "-I"
> "/home/bryanpkc/llvm-project/openmp/runtime/test" "-I"
> "/home/bryanpkc/llvm-project/build/projects/openmp/runtime/src" "-L"
> "/home/bryanpkc/llvm-project/build/lib" "-I"
> "/home/bryanpkc/llvm-project/openmp/runtime/test/ompt"
> "/home/bryanpkc/llvm-project/openmp/runtime/test/api/has_openmp.c" "-o"
> "/home/bryanpkc/llvm-project/build/projects/openmp/runtime/test/api/Output/has_openmp.c.tmp"
> "-lm" "-latomic"
> # command stderr:
> /usr/bin/ld: /home/bryanpkc/llvm-project/build/lib/libomp.so: undefined
> reference to `__asan_load_cxx_array_cookie'
> /usr/bin/ld: /home/bryanpkc/llvm-project/build/lib/libomp.so: undefined
> reference to `__asan_set_shadow_f8'
> /usr/bin/ld: /home/bryanpkc/llvm-project/build/lib/libomp.so: undefined
> reference to `__asan_stack_malloc_8'
> /usr/bin/ld: /home/bryanpkc/llvm-project/build/lib/libomp.so: undefined
> reference to `__asan_stack_malloc_2'
> /usr/bin/ld: /home/bryanpkc/llvm-project/build/lib/libomp.so: undefined
> reference to `__asan_unregister_globals'
>
> This type of failures are affecting multiple groups of tests:
>
> Builtins-aarch64-linux :: *
> LLVM :: tools/gold/X86/*
> libomp :: *
> libomptarget :: *
>
> Any ideas? Could you point me to the build bot that has a good
> Clang/LLVM/OpenMP
> configuration with ASan enabled? Unfortunately the documentation at
> https://llvm.org/docs/CMake.html is not clear on how to get this working.
>
> --
> Bryan
>
>
> On Tue, Oct 20, 2020 at 12:33 PM Kostya Serebryany <kcc at google.com> wrote:
>
>> Hi Bryan,
>>
>> Yes, building LLVM with GCC+ASAN is a warranty void zone.
>> It can probably be made to work with some effort, but unless someone is
>> willing to
>> maintain a public bot with this build, it will remain unsupported.
>>
>> Building LLVM with LLVM+ASAN is fully supported, and the bots are
>> maintained.
>>
>> thanks!
>>
>> --kcc
>>
>>
>> On Tue, Oct 20, 2020 at 7:39 AM Bryan Chan via cfe-dev <
>> cfe-dev at lists.llvm.org> wrote:
>>
>>> Hi lists,
>>>
>>> I am encountering a large number of check-clang failures after building
>>> Clang/LLVM with -DLLVM_USE_SANITIZER=Address. I have reported the issue
>>> on Bugzilla (https://bugs.llvm.org/show_bug.cgi?id=47678). I cannot
>>> even compile helloworld.c with the resulting clang tool without a lot of
>>> false positives from ASan. Is it because I am not supposed to use GCC's
>>> AddressSanitizer when building Clang?
>>>
>>> --
>>> Bryan
>>> _______________________________________________
>>> cfe-dev mailing list
>>> cfe-dev at lists.llvm.org
>>> https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>>>
>>
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