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ARROW-6259: [C++] Add -Wno-extra-semi-stmt when compiling with clang …
…8 to work around Flatbuffers bug, suppress other new LLVM 8 warnings LLVM 8 introduces `-Wextra-semi-stmt` and Flatbuffers generates code with superfluous semicolons (upstream bug report google/flatbuffers#5482). This is breaking our macOS builds for the last few hours because conda-forge upgraded their compiler toolchain from Apple clang 4.0.1 to clang 8.0.0 this afternoon. Closes #5096 from wesm/ARROW-6259 and squashes the following commits: 96cbba9 <Wes McKinney> Suppress -Wshadow-field and -Wc++2a-compat also 686339c <Wes McKinney> Add -Wno-extra-semi-stmt when compiling with clang 8 to work around Flatbuffers bug Authored-by: Wes McKinney <wesm+git@apache.org> Signed-off-by: Wes McKinney <wesm+git@apache.org>
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