protze.joachim added a comment.
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);
^
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D94745/new/
https://reviews.llvm.org/D94745
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