On Sun, Aug 5, 2018 at 5:49 PM, Dimitry Andric <dimi...@andric.com> wrote:
> On 3 Aug 2018, at 13:37, Hans Wennborg via Release-testers
> <release-test...@lists.llvm.org> wrote:
>>
>> 7.0.0-rc1 was just tagged (from the branch at r338847).
>>
>> It's early in the release process, but I'd like to find out what the
>> status is of the branch on our various platforms.
>>
>> Please run the test script, share the results, and upload binaries.
>
> Hmm, I'm running into a rather nasty snag now on i386-freebsd11, due to our
> lack of atomic 64 bit primitives; Phase2's configure dies with:
>
> -- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB
> -- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB - Success
> -- Performing Test HAVE_CXX_ATOMICS64_WITHOUT_LIB
> -- Performing Test HAVE_CXX_ATOMICS64_WITHOUT_LIB - Failed
> -- Looking for __atomic_load_8 in atomic
> -- Looking for __atomic_load_8 in atomic - not found
> CMake Error at cmake/modules/CheckAtomic.cmake:75 (message):
> Host compiler appears to require libatomic, but cannot find it.
>
> Interestingly, Phase1 does *not* suffer from this, but there the "host
> compiler" is clang 6.0.0.
>
> Phase1 CMake output:
>
> Performing C++ SOURCE FILE Test HAVE_CXX_ATOMICS64_WITHOUT_LIB succeeded
> with the following output:
> Change Dir:
> /home/dim/llvm/7.0.0/rc1/Phase1/Release/llvmCore-7.0.0-rc1.obj/CMakeFiles/CMakeTmp
>
> Run Build Command:"/usr/local/bin/gmake" "cmTC_845df/fast"
> /usr/local/bin/gmake -f CMakeFiles/cmTC_845df.dir/build.make
> CMakeFiles/cmTC_845df.dir/build
> gmake[1]: Entering directory
> '/home/dim/llvm/7.0.0/rc1/Phase1/Release/llvmCore-7.0.0-rc1.obj/CMakeFiles/CMakeTmp'
> Building CXX object CMakeFiles/cmTC_845df.dir/src.cxx.o
> /usr/bin/c++ -DHAVE_CXX_ATOMICS64_WITHOUT_LIB -std=c++11
> -Werror=unguarded-availability-new -o CMakeFiles/cmTC_845df.dir/src.cxx.o
> -c
> /home/dim/llvm/7.0.0/rc1/Phase1/Release/llvmCore-7.0.0-rc1.obj/CMakeFiles/CMakeTmp/src.cxx
> Linking CXX executable cmTC_845df
> /usr/local/bin/cmake -E cmake_link_script
> CMakeFiles/cmTC_845df.dir/link.txt --verbose=1
> /usr/bin/c++ -DHAVE_CXX_ATOMICS64_WITHOUT_LIB -std=c++11
> -Werror=unguarded-availability-new CMakeFiles/cmTC_845df.dir/src.cxx.o -o
> cmTC_845df -lm
> gmake[1]: Leaving directory
> '/home/dim/llvm/7.0.0/rc1/Phase1/Release/llvmCore-7.0.0-rc1.obj/CMakeFiles/CMakeTmp'
>
> Source file was:
>
> #include <atomic>
> #include <cstdint>
> std::atomic<uint64_t> x (0);
> int main() {
> uint64_t i = x.load(std::memory_order_relaxed);
> return 0;
> }
>
> Phase2 CMake output:
>
> Performing C++ SOURCE FILE Test HAVE_CXX_ATOMICS64_WITHOUT_LIB failed
> with the following output:
> Change Dir:
> /home/dim/llvm/7.0.0/rc1/Phase2/Release/llvmCore-7.0.0-rc1.obj/CMakeFiles/CMakeTmp
>
> Run Build Command:"/usr/local/bin/gmake" "cmTC_720f3/fast"
> /usr/local/bin/gmake -f CMakeFiles/cmTC_720f3.dir/build.make
> CMakeFiles/cmTC_720f3.dir/build
> gmake[1]: Entering directory
> '/home/dim/llvm/7.0.0/rc1/Phase2/Release/llvmCore-7.0.0-rc1.obj/CMakeFiles/CMakeTmp'
> Building CXX object CMakeFiles/cmTC_720f3.dir/src.cxx.o
>
> /home/dim/llvm/7.0.0/rc1/Phase1/Release/llvmCore-7.0.0-rc1.install/usr/local/bin/clang++
> -DHAVE_CXX_ATOMICS64_WITHOUT_LIB -std=c++11
> -Werror=unguarded-availability-new -o CMakeFiles/cmTC_720f3.dir/src.cxx.o
> -c
> /home/dim/llvm/7.0.0/rc1/Phase2/Release/llvmCore-7.0.0-rc1.obj/CMakeFiles/CMakeTmp/src.cxx
> Linking CXX executable cmTC_720f3
> /usr/local/bin/cmake -E cmake_link_script
> CMakeFiles/cmTC_720f3.dir/link.txt --verbose=1
>
> /home/dim/llvm/7.0.0/rc1/Phase1/Release/llvmCore-7.0.0-rc1.install/usr/local/bin/clang++
> -DHAVE_CXX_ATOMICS64_WITHOUT_LIB -std=c++11
> -Werror=unguarded-availability-new CMakeFiles/cmTC_720f3.dir/src.cxx.o -o
> cmTC_720f3 -lm
> CMakeFiles/cmTC_720f3.dir/src.cxx.o: In function `main':
> src.cxx:(.text+0x33): undefined reference to `__atomic_load_8'
> clang-7: error: linker command failed with exit code 1 (use -v to see
> invocation)
> gmake[1]: *** [CMakeFiles/cmTC_720f3.dir/build.make:98: cmTC_720f3] Error
> 1
> gmake[1]: Leaving directory
> '/home/dim/llvm/7.0.0/rc1/Phase2/Release/llvmCore-7.0.0-rc1.obj/CMakeFiles/CMakeTmp'
> gmake: *** [Makefile:126: cmTC_720f3/fast] Error 2
>
> Source file was:
>
> #include <atomic>
> #include <cstdint>
> std::atomic<uint64_t> x (0);
> int main() {
> uint64_t i = x.load(std::memory_order_relaxed);
> return 0;
> }
>
> Apparently, with clang 6.0 it didn't generate libcalls to atomic functions,
> but just put in cmpxchg8b's, I guess? And with clang 7.0 this seems to have
> changed.
>
> For now, I can only test on amd64 due to this, since I don't have an easy
> workaround.
This doesn't sound so good, but I'm glad we found out early.
Did you file a bug to track this? (Sorry if you already did, I haven't
read through the list today.)
Thanks,
Hans
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