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https://issues.apache.org/jira/browse/ARROW-7784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17031724#comment-17031724
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Antoine Pitrou commented on ARROW-7784:
---------------------------------------
Using [CLangBuildAnalyzer|https://github.com/aras-p/ClangBuildAnalyzer] I get
the following results:
{code}
**** Files that took longest to codegen (compiler backend):
66372 ms:
build-clang-profile/src/arrow/CMakeFiles/arrow_objlib.dir/sparse_tensor.cc.o
16457 ms:
build-clang-profile/src/arrow/CMakeFiles/arrow_objlib.dir/array/diff.cc.o
6283 ms: build-clang-profile/src/arrow/CMakeFiles/arrow_objlib.dir/scalar.cc.o
5284 ms:
build-clang-profile/src/arrow/CMakeFiles/arrow_objlib.dir/builder.cc.o
5090 ms:
build-clang-profile/src/arrow/CMakeFiles/arrow_objlib.dir/array/dict_internal.cc.o
{code}
> [C++] diff.cc is extremely slow to compile
> ------------------------------------------
>
> Key: ARROW-7784
> URL: https://issues.apache.org/jira/browse/ARROW-7784
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Antoine Pitrou
> Priority: Minor
>
> This comes up especially when doing an optimized build. {{diff.cc}} is always
> enabled even if all components are disabled, and it takes multiple seconds to
> compile.
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