[cfe-dev] AddressSanitizer

[Vitaly Buka via cfe-dev]

Can you please share the full cmake command line?

On Wed, 21 Oct 2020 at 11:28, Kostya Serebryany <kcc at google.com> wrote:

> +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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