[cfe-dev] Libcxx cmake warning "Host compiler must support std::atomic!"

[Brian M. Rzycki via cfe-dev]

Sorry, I wasn't clear. I meant the change is somewhere between those two
commits: those are two nightly builds 24 hours apart.

On Wed, Mar 27, 2019 at 3:08 PM JF Bastien <jfbastien at apple.com> wrote:

>
>
> On Mar 27, 2019, at 12:59 PM, Brian M. Rzycki via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
> Hello Krzysztof,
>
> I've seen these errors in our nightly builds as well and noticed them when
> tracking down a different set of build breaks last month. I don't honestly
> know if they can be safely ignored. Our nightly compilers work for our
> testing even with the errors. I would be interested in knowing what this
> means and if it impacts us though.
>
> I did a little digging and found when we started seeing the
> messages. These SHAs are from the LLVM monorepo (
> https://github.com/llvm/llvm-project.git). We started seeing them in our
> builds 2019-March-05. I don't have the exact commit but may have time
> tomorrow to dig in a bit more.
>
> b306ef12f04635-master (llvm-svn: 355299) # clean
> 81dbc02671b223-master (llvm-svn: 355375) # emits "Host compiler must
> support std::atomic!”
>
>
> This change?
>
> https://github.com/llvm/llvm-project/commit/81dbc02671b223
>
> It’s an LLDB commit, doesn’t seem related. Maybe an adjacent change was
> the root cause?
>
>
> On Wed, Mar 27, 2019 at 1:20 PM Krzysztof Parzyszek via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> I'm seeing the following warning during cmake. I'm not sure when it
>> started. Is this a known issue? Can it be safely ignored?
>>
>> CMake Warning at projects/libcxx/cmake/Modules/CheckLibcxxAtomic.cmake:49
>> (message):
>>   Host compiler must support std::atomic!
>> Call Stack (most recent call first):
>>   projects/libcxx/cmake/config-ix.cmake:63 (include)
>>   projects/libcxx/CMakeLists.txt:476 (include)
>>
>> It's also showing up in the upstream bots:
>>
>> http://lab.llvm.org:8011/builders/libcxx-libcxxabi-x86_64-linux-debian/builds/1189/steps/cmake/logs/stdio
>>
>> The linker errors (in my cmake) are actually:
>> CMakeFiles/cmTC_354e0.dir/src.cxx.o: In function `__clang_call_terminate':
>> src.cxx:(.text.__clang_call_terminate[__clang_call_terminate]+0x2):
>> undefined reference to `__cxa_begin_catch'
>> src.cxx:(.text.__clang_call_terminate[__clang_call_terminate]+0xb):
>> undefined reference to `std::terminate()'
>> CMakeFiles/cmTC_354e0.dir/src.cxx.o:(.data.DW.ref.__gxx_personality_v0[DW.ref.__gxx_personality_v0]+0x0):
>> undefined reference to `__gxx_personality_v0'
>> clang-8: error: linker command failed with exit code 1 (use -v to see
>> invocation)
>> CMakeFiles/cmTC_354e0.dir/build.make:97: recipe for target 'cmTC_354e0'
>> failed
>>
>> --
>> Krzysztof Parzyszek  kparzysz at quicinc.com   LLVM compiler development
>>
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>> cfe-dev at lists.llvm.org
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