jdoerfert added a comment.
In D94745#2539405 <https://reviews.llvm.org/D94745#2539405>, @protze.joachim
wrote:
> For me this patch breaks building llvm. Before this patch, I successfully
> built llvm using a llvm/10 installation on the system. What is probably
> special with our llvm installation is that we by default use libc++ rather
> than libstdc++.
>
> FAILED:
> projects/openmp/libomptarget/deviceRTLs/nvptx/loop.cu-cuda_110-sm_60.bc
> cd BUILD/projects/openmp/libomptarget/deviceRTLs/nvptx &&
> /home/pj416018/sw/UTIL/ccache/bin/clang -S -x c++ -target nvptx64 -Xclang
> -emit-llvm-bc -Xclang -aux-triple -Xclang x86_64-unknown-linux-gnu -fopenmp
> -fopenmp-cuda-mode -Xclang -fopenmp-is-device -D__CUDACC__
> -I${llvm-SOURCE}/openmp/libomptarget/deviceRTLs
> -I${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/nvptx/src
> -DOMPTARGET_NVPTX_DEBUG=0 -Xclang -target-cpu -Xclang sm_60
> -D__CUDA_ARCH__=600 -Xclang -target-feature -Xclang +ptx70
> -DCUDA_VERSION=11000
> ${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/common/src/loop.cu -o
> loop.cu-cuda_110-sm_60.bc
> In file included from
> ${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/common/src/loop.cu:16:
> In file included from
> ${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/common/omptarget.h:18:
> In file included from
> ${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/common/debug.h:31:
> In file included from
> ${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/common/device_environment.h:16:
> In file included from
> ${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.h:18:
> In file included from
> ${llvm-INSTALL}/10.0.0/bin/../include/c++/v1/stdlib.h:100:
> In file included from
> ${llvm-INSTALL}/10.0.0/bin/../include/c++/v1/math.h:312:
> ${llvm-INSTALL}/10.0.0/bin/../include/c++/v1/limits:406:89: error: host
> requires 128 bit size 'std::__1::__libcpp_numeric_limits<long double,
> true>::type' (aka 'long double') type support, but device 'nvptx64' does not
> support it
> _LIBCPP_INLINE_VISIBILITY static _LIBCPP_CONSTEXPR type lowest()
> _NOEXCEPT {return -max();}
>
> ^~~~~
>
> My cmake call looks like:
>
> cmake -GNinja -DCMAKE_BUILD_TYPE=Release \
> -DCMAKE_INSTALL_PREFIX=$INSTALLDIR \
> -DLLVM_ENABLE_LIBCXX=ON \
> -DCLANG_DEFAULT_CXX_STDLIB=libc++ \
> -DCLANG_OPENMP_NVPTX_DEFAULT_ARCH=sm_70 \
> -DLIBOMPTARGET_ENABLE_DEBUG=on \
> -DLIBOMPTARGET_NVPTX_ENABLE_BCLIB=true \
> -DLIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES=35,60,70 \
>
> -DLLVM_ENABLE_PROJECTS="clang;compiler-rt;libcxxabi;libcxx;libunwind;openmp" \
> -DCMAKE_BUILD_WITH_INSTALL_RPATH=ON \
> $LLVM_SOURCE
>
> I also tried to build using my newest installed llvm build
> (7dd198852b4db52ae22242dfeda4eccda83aa8b2
> <https://reviews.llvm.org/rG7dd198852b4db52ae22242dfeda4eccda83aa8b2>):
>
> In file included from
> ${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.cu:14:
> In file included from
> ${llvm-SOURCE}/openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.h:18:
> ${llvm-INSTALL}/bin/../include/c++/v1/stdlib.h:128:10: error:
> '__builtin_fabsl' requires 128 bit size 'long double' type support, but
> device 'nvptx64' does not support it
> return __builtin_fabsl(__lcpp_x);
> ^
This is tracked in PR48933, could you give D95928
<https://reviews.llvm.org/D95928> and it's two dependences a try?
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D94745/new/
https://reviews.llvm.org/D94745
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