Keith Kraus created ARROW-13500:
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Summary: warning: unrecognized command line option
'-Wno-unknown-warning-option' when building with gcc 9.3
Key: ARROW-13500
URL: https://issues.apache.org/jira/browse/ARROW-13500
Project: Apache Arrow
Issue Type: Bug
Components: C++
Affects Versions: 6.0.0
Reporter: Keith Kraus
Fix For: 6.0.0
Looks like this option isn't supported by gcc (it is supported by Clang) and
only triggers when there's an existing warning, which we get due to getting
some maybe uninitialized warnings.
{code:none}
/home/keith/git/arrow/cpp/src/arrow/tensor.cc: In member function
'arrow::Result<long int> arrow::Tensor::CountNonZero() const':
/home/keith/git/arrow/cpp/src/arrow/tensor.cc:337:18: warning: '*((void*)&
counter +8)' may be used uninitialized in this function [-Wmaybe-uninitialized]
337 | NonZeroCounter counter(*this);
| ^~~~~~~
At global scope:
cc1plus: warning: unrecognized command line option '-Wno-unknown-warning-option'
{code}
These 2 lines likely just need to be deleted:
https://github.com/apache/arrow/blob/master/cpp/cmake_modules/SetupCxxFlags.cmake#L346-L347
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