[jira] [Created] (ARROW-7049) warnings building on mingw-w64

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

Jeroen created ARROW-7049:
-----------------------------

             Summary: warnings building on mingw-w64
                 Key: ARROW-7049
                 URL: https://issues.apache.org/jira/browse/ARROW-7049
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
    Affects Versions: 0.15.1
            Reporter: Jeroen


Two warnings when building libarrow 0.15.1 on mingw-w64:

{code}
[  2%] Running thrift compiler on parquet.thrift
[WARNING:C:/msys64/home/mingw-packages/mingw-w64-arrow/src/apache-arrow-0.15.1/cpp/src/parquet/parquet.thrift:297] The "byte" type is a compatibility alias for "i8". Use "i8" to emphasize the signedness of this type.
{code} 

And later:

{code}
 81%] Building CXX object src/parquet/CMakeFiles/parquet_static.dir/column_reader.cc.obj
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/apache-arrow-0.15.1/cpp/src/parquet/arrow/writer.cc: In member function 'virtual arrow::Status parquet::arrow::FileWriterImpl::WriteColumnChunk(const std::shared_ptr<arrow::ChunkedArray>&, int64_t, int64_t)':
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/apache-arrow-0.15.1/cpp/src/parquet/arrow/writer.cc:79:41: warning: 'schema_field' may be used uninitialized in this function [-Wmaybe-uninitialized]
         schema_manifest_(schema_manifest) {}
                                         ^
C:/msys64/home/mingw-packages/mingw-w64-arrow/src/apache-arrow-0.15.1/cpp/src/parquet/arrow/writer.cc:466:24: note: 'schema_field' was declared here
     const SchemaField* schema_field;
{code}




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