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https://issues.apache.org/jira/browse/ARROW-8166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063049#comment-17063049
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Frank Du commented on ARROW-8166:
---------------------------------
Repeat it with passing COMPILER clang.
-DCMAKE_C_COMPILER=clang-8 \
-DCMAKE_CXX_COMPILER=clang++-8 \
/mnt/arrow/cpp/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);
> [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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