Antoine Pitrou created ARROW-3888: ------------------------------------- Summary: [C++] Compilation warnings with gcc 7.3.0 Key: ARROW-3888 URL: https://issues.apache.org/jira/browse/ARROW-3888 Project: Apache Arrow Issue Type: Bug Components: C++ Affects Versions: 0.11.1 Reporter: Antoine Pitrou
I sometimes get these warnings in release mode: {code} [27/161] Building CXX object src/arrow/CMakeFiles/arrow_objlib.dir/csv/converter.cc.o In file included from ../src/arrow/csv/converter.cc:24:0: ../src/arrow/builder.h: In member function 'virtual arrow::Status arrow::csv::{anonymous}::TimestampConverter::Convert(const arrow::csv::BlockParser&, int32_t, std::shared_ptr<arrow::Array>*)': ../src/arrow/builder.h:395:5: warning: 'value' may be used uninitialized in this function [-Wmaybe-uninitialized] raw_data_[length_++] = val; ^~~~~~~~~ ../src/arrow/csv/converter.cc:347:18: note: 'value' was declared here value_type value; ^~~~~ [93/161] Building CXX object src/parquet/CMakeFiles/parquet_objlib.dir/arrow/writer.cc.o In file included from ../src/parquet/arrow/writer.cc:18:0: ../src/parquet/arrow/writer.h: In function 'std::shared_ptr<parquet::arrow::ArrowWriterProperties> parquet::arrow::default_arrow_writer_properties()': ../src/parquet/arrow/writer.h:82:40: warning: '<anonymous>.parquet::arrow::ArrowWriterProperties::Builder::coerce_timestamps_unit_' may be used uninitialized in this function [-Wmaybe-uninitialized] truncated_timestamps_allowed_)); ^ ../src/parquet/arrow/writer.cc: In member function 'arrow::Status parquet::arrow::{anonymous}::ArrowColumnWriter::Write(const arrow::Array&)': ../src/parquet/arrow/writer.cc:278:56: warning: 'num_levels' may be used uninitialized in this function [-Wmaybe-uninitialized] RETURN_NOT_OK(this->data_buffer->Resize(num_values * sizeof(T), false)); ^ ../src/parquet/arrow/writer.cc:869:11: note: 'num_levels' was declared here int64_t num_levels; ^~~~~~~~~~ [94/161] Building CXX object src/parquet/CMakeFiles/parquet_objlib.dir/arrow/reader.cc.o ../src/parquet/arrow/reader.cc: In function 'int64_t parquet::arrow::impala_timestamp_to_nanoseconds(const parquet::Int96&)': ../src/parquet/arrow/reader.cc:79:86: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] int64_t nanoseconds = *(reinterpret_cast<const int64_t*>(&(impala_timestamp.value))); ^ {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005)