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https://issues.apache.org/jira/browse/ARROW-8166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063046#comment-17063046
]
Frank Du commented on ARROW-8166:
---------------------------------
Seems I'm still using gcc for the build, how can I change to clang? Sorry I'm
not vary familiar with this part.
cd /mnt/arrow/cpp/build/src/arrow/util && /usr/bin/c++ -DARROW_JEMALLOC
-DARROW_JEMALLOC_INCLUDE_DIR="" -DARROW_USE_SIMD -DARROW_WITH_SNAPPY
-DARROW_WITH_TIMING_TESTS -DGTEST_LINKED_AS_
SHARED_LIBRARY=1 -DURI_STATIC_BUILD -isystem
/mnt/arrow/cpp/thirdparty/flatbuffers/include -isystem
/mnt/arrow/cpp/build/boost_ep-prefix/src/boost_ep -isystem
/mnt/arrow/cpp/build/snappy
_ep/src/snappy_ep-install/include -isystem
/mnt/arrow/cpp/build/gflags_ep-prefix/src/gflags_ep/include -isystem
/mnt/arrow/cpp/build/thrift_ep-install/include -isystem /mnt/arrow/cpp/bui
ld/protobuf_ep-install/include -isystem
/mnt/arrow/cpp/build/jemalloc_ep-prefix/src -isystem
/mnt/arrow/cpp/build/googletest_ep-prefix/src/googletest_ep/include -isystem
/mnt/arrow/cpp/b
uild/gbenchmark_ep/src/gbenchmark_ep-install/include -isystem
/mnt/arrow/cpp/build/rapidjson_ep/src/rapidjson_ep-install/include -isystem
/mnt/arrow/cpp/build/re2_ep-install/include -isy
stem /mnt/arrow/cpp/thirdparty/hadoop/include -I/mnt/arrow/cpp/build/src
-I/mnt/arrow/cpp/src -I/mnt/arrow/cpp/src/generated -Wno-noexcept-type
-fdiagnostics-color=always -O3 -DNDEBUG
-Wall -march=skylake-avx512 -O3 -DNDEBUG -fPIE -pthread -std=gnu++11 -o
CMakeFiles/arrow-utility-test.dir/rle_encoding_test.cc.o -c
/mnt/arrow/cpp/src/arrow/util/rle_encoding_test.cc
[ 49%] Linking CXX executable ../../../release/arrow-utility-test
> [C++] AVX512 intrinsics fail to compile with clang-8 on Ubuntu 18.04
> --------------------------------------------------------------------
>
> Key: ARROW-8166
> URL: https://issues.apache.org/jira/browse/ARROW-8166
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.17.0
>
>
> cc [~frank.du]
> I have an i9-9960X AVX512-capable CPU but I see
> {code}
> /usr/bin/ccache /usr/bin/clang++-8 -DARROW_EXTRA_ERROR_CONTEXT -DARROW_HDFS
> -DARROW_JEMALLOC -DARROW_JEMALLOC_INCLUDE_DIR="" -DARROW_NO_DEPRECATED_API
> -DARROW_USE_SIMD -DARROW_WITH_BROTLI -DARROW_WITH_BZ2 -DARROW_WITH_LZ4
> -DARROW_WITH_SNAPPY -DARROW_WITH_TIMING_TESTS -DARROW_WITH_ZLIB
> -DARROW_WITH_ZSTD -DURI_STATIC_BUILD -Isrc -I../src -I../src/generated
> -isystem ../thirdparty/flatbuffers/include -isystem
> /home/wesm/cpp-toolchain/include -isystem jemalloc_ep-prefix/src -isystem
> ../thirdparty/hadoop/include -Qunused-arguments -fcolor-diagnostics
> -fuse-ld=gold -ggdb -O0 -Wall -Wextra -Wdocumentation -Wno-missing-braces
> -Wno-unused-parameter -Wno-unknown-warning-option
> -Wno-constant-logical-operand -Werror -Wno-unknown-warning-option
> -march=skylake-avx512 -maltivec -fno-omit-frame-pointer -g -fPIE -pthread
> -std=gnu++11 -MD -MT
> src/arrow/util/CMakeFiles/arrow-utility-test.dir/rle_encoding_test.cc.o -MF
> src/arrow/util/CMakeFiles/arrow-utility-test.dir/rle_encoding_test.cc.o.d -o
> src/arrow/util/CMakeFiles/arrow-utility-test.dir/rle_encoding_test.cc.o -c
> ../src/arrow/util/rle_encoding_test.cc
> In file included from ../src/arrow/util/rle_encoding_test.cc:33:
> In file included from ../src/arrow/util/bit_stream_utils.h:28:
> ../src/arrow/util/bpacking.h:49:5: error: use of undeclared identifier
> '__m512i_u'
> *(__m512i_u*)out = _mm512_and_epi32(_mm512_srlv_epi32(inls, shifts), masks);
> ^
> ../src/arrow/util/bpacking.h:49:15: error: expected expression
> *(__m512i_u*)out = _mm512_and_epi32(_mm512_srlv_epi32(inls, shifts), masks);
> ^
> ../src/arrow/util/bpacking.h:55:5: error: use of undeclared identifier
> '__m512i_u'
> *(__m512i_u*)out = _mm512_and_epi32(_mm512_srlv_epi32(inls, shifts), masks);
> ^
> ../src/arrow/util/bpacking.h:55:15: error: expected expression
> *(__m512i_u*)out = _mm512_and_epi32(_mm512_srlv_epi32(inls, shifts), masks);
> ^
> 4 errors generated.
> {code}
> I tried compiling with gcc 8.3 instead of clang-8 and it worked. So it seems
> that because the base gcc toolchain on Ubuntu 18.04 is gcc 7.x that the
> clang-* versions are using the gcc-7 toolchain headers. Evidently we will
> need to make this more robust
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