[llvm-bugs] [Bug 49158] New: 12.0.0-rc1 build error for device runtime

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=49158

            Bug ID: 49158
           Summary: 12.0.0-rc1 build error for device runtime
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Runtime Library
          Assignee: unassignedbugs at nondot.org
          Reporter: protze at itc.rwth-aachen.de
                CC: llvm-bugs at lists.llvm.org

Building the just tagged 12.0.0-rc1, I still cannot compile LLVM including
libomptarget. The build aborts with the following error, I build OpenMP as
runtime, therefore the newly built clang is used:


FAILED: projects/openmp/libomptarget/deviceRTLs/nvptx/loop.cu-cuda_80-sm_70.bc 
cd ${BUILD_DIR}/projects/openmp/libomptarget/deviceRTLs/nvptx && clang -S -x
c++ -target nvptx64 -Xclang -emit-llvm-bc -Xclang -aux-triple -Xclang
x86_64-unknown-linux-gnu -fopenmp -fopenmp-cuda-mode -Xclang -fopenmp-is-device
-D__CUDACC__ -I${SOURCE_DIR}/openmp/libomptarget/deviceRTLs
-I${SOURCE_DIR}/openmp/libomptarget/deviceRTLs/nvptx/src
-DOMPTARGET_NVPTX_DEBUG=0 -Xclang -target-cpu -Xclang sm_70 -D__CUDA_ARCH__=700
-Xclang -target-feature -Xclang +ptx42 -DCUDA_VERSION=8000
${SOURCE_DIR}/openmp/libomptarget/deviceRTLs/common/src/loop.cu -o
loop.cu-cuda_80-sm_70.bc
In file included from
${SOURCE_DIR}/openmp/libomptarget/deviceRTLs/common/src/loop.cu:16:
In file included from
${SOURCE_DIR}/openmp/libomptarget/deviceRTLs/common/omptarget.h:18:
In file included from
${SOURCE_DIR}/openmp/libomptarget/deviceRTLs/common/debug.h:31:
In file included from
${SOURCE_DIR}/openmp/libomptarget/deviceRTLs/common/device_environment.h:16:
In file included from
${SOURCE_DIR}/openmp/libomptarget/deviceRTLs/nvptx/src/target_impl.h:18:
${SYSTEM}/clang/11.0.0/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);
         ^
${SYSTEM}/clang/11.0.0/bin/../include/c++/v1/stdlib.h:128:10: note:
'__builtin_fabsl' defined here
${SYSTEM}/clang/11.0.0/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);
         ^
${SYSTEM}/clang/11.0.0/bin/../include/c++/v1/stdlib.h:128:10: note:
'__builtin_fabsl' defined here
${SYSTEM}/clang/11.0.0/bin/../include/c++/v1/stdlib.h:128:26: error: '__lcpp_x'
requires 128 bit size 'long double' type support, but device 'nvptx64' does not
support it
  return __builtin_fabsl(__lcpp_x);
                         ^
${SYSTEM}/clang/11.0.0/bin/../include/c++/v1/stdlib.h:127:17: note: '__lcpp_x'
defined here
abs(long double __lcpp_x) _NOEXCEPT {
                ^
3 errors generated.

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