[jira] [Created] (ARROW-12815) [C++] Warning when compiling on ubunut 21.04

["Nate Clark (Jira)" <ji...@apache.org>]

Nate Clark created ARROW-12815:
----------------------------------

             Summary: [C++] Warning when compiling on ubunut 21.04
                 Key: ARROW-12815
                 URL: https://issues.apache.org/jira/browse/ARROW-12815
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 5.0.0
            Reporter: Nate Clark


Warning generated when compiling using gcc 10.2 on ubuntu 21.04
{noformat}
In file included from apache-arrow/cpp/src/arrow/chunked_array.h:26,
from apache-arrow/cpp/src/arrow/table.h:25,
from apache-arrow/cpp/src/arrow/table.cc:18,
from src/arrow/CMakeFiles/arrow_objlib.dir/Unity/unity_4_cxx.cxx:4:
apache-arrow/cpp/src/arrow/tensor.cc: In member function ‘arrow::Tensor::CountNonZero() const’:
apache-arrow/cpp/src/arrow/result.h:446:5: warning: ‘MEM[(long int &)&counter + 8]’ may be used uninitialized in this function [-Wmaybe-uninitialized]
446 | new (&data_) T(std::forward<U>(u));
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from src/arrow/CMakeFiles/arrow_objlib.dir/Unity/unity_4_cxx.cxx:6:
apache-arrow/cpp/src/arrow/tensor.cc:337:18: note: ‘MEM[(long int &)&counter + 8]’ was declared here
337 | NonZeroCounter counter(*this);
| ^~~~~~~ {noformat}



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