[Openmp-dev] clang 9.0.0 + libstdc++ problem

[Gheorghe-Teod Bercea via Openmp-dev]

Hi Gabriele,

You can set the -DGCC_INSTALL_PREFIX to point to the folder with the 
desired version of GCC.

The GCC folder you want to point to is the one containing the lib and 
include folders. I use GCC 6.4.

Thanks a lot,

--Doru








From:   "Jost, Gabriele \(ARC-TNC\)\[Supersmith\] via Openmp-dev" 
<openmp-dev at lists.llvm.org>
To:     "openmp-dev at lists.llvm.org" <openmp-dev at lists.llvm.org>
Date:   11/27/2019 03:17 PM
Subject:        [EXTERNAL] [Openmp-dev] clang 9.0.0 + libstdc++ problem
Sent by:        "Openmp-dev" <openmp-dev-bounces at lists.llvm.org>



Hello llvm developers!
I am trying to build the OpenMP runtime with clang 9.0.0. The clang 
compiler fails to find the libstdc++ library.
I specified the pathname, but it does not help.
I had to resort to configuring like this:
cmake -DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX="/nobackupnfs2/clang-install"\
-DCMAKE_C_COMPILER=/nobackupnfs2/clang-install/bin/clang\
-DCMAKE_CXX_COMPILER=/nobackupnfs2/clang-install/bin/clang++\
-DLIBOMPTARGET_DEP_LIBELF_LIBRARIES:FILEPATH=/usr/lib64/libelf.so.1 \
-DLLVM_LIBSTDCXX:FILEPATH=/usr/lib64/libstdc++.so.6\
-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON\
-DCLANG_OPENMP_NVPTX_DEFAULT_ARCH=sm_60 \
-DLIBOMPTARGET_NVPTX_COMPUTE_CAPABILITIES=35,60,70 ../llvm-9.0.0.src
 
Is there a way to tell clang to use the correct library? It complains that 
the library is too old, but I think it is because it does not find the 
right one.
 
Gabriele Jost
 
************************************************************************
Gabriele Jost       NASA Ames Research Center
Email: Gabriele.Jost at nasa.gov    Mail Stop 258-6
Work Phone: (650) 604-0468     Bldg. 258, Rm. 232-4
Scientific & HPC Application        P.O. Box 1
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