[ARROW-1248] [Python] C linkage warnings in Clang with public Cython API

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.6.0
• Component/s: Python
• External issue URL: https://github.com/apache/arrow/issues/17120
• Assignee: Wes McKinney
• Reporter: Wes McKinney
• Created: 21/Jul/17 17:34
• Updated: 11/Jan/23 07:13
• Resolved: 26/Jul/17 01:48

Description

/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4327:60: warning: 'pyarrow_unwrap_buffer' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::Buffer>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::Buffer> ) pyarrow_unwrap_buffer(PyObject *); /*proto*/
                                                           ^
/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4329:62: warning: 'pyarrow_unwrap_data_type' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::DataType>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::DataType> ) pyarrow_unwrap_data_type(PyObject *); /*proto*/
                                                             ^
/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4331:59: warning: 'pyarrow_unwrap_field' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::Field>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::Field> ) pyarrow_unwrap_field(PyObject *); /*proto*/
                                                          ^
/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4333:60: warning: 'pyarrow_unwrap_schema' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::Schema>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::Schema> ) pyarrow_unwrap_schema(PyObject *); /*proto*/
                                                           ^
/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4335:59: warning: 'pyarrow_unwrap_array' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::Array>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::Array> ) pyarrow_unwrap_array(PyObject *); /*proto*/
                                                          ^
/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4338:60: warning: 'pyarrow_unwrap_tensor' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::Tensor>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::Tensor> ) pyarrow_unwrap_tensor(PyObject *); /*proto*/
                                                           ^
/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4340:60: warning: 'pyarrow_unwrap_column' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::Column>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::Column> ) pyarrow_unwrap_column(PyObject *); /*proto*/
                                                           ^
/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4342:59: warning: 'pyarrow_unwrap_table' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::Table>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::Table> ) pyarrow_unwrap_table(PyObject *); /*proto*/
                                                          ^
/home/wesm/code/arrow/python/build/temp.linux-x86_64-3.5/lib.cxx:4344:65: warning: 'pyarrow_unwrap_batch' has C-linkage specified, but returns user-defined type 'std::shared_ptr<arrow::RecordBatch>' which is incompatible with C [-Wreturn-type-c-linkage]
__PYX_EXTERN_C DL_EXPORT(std::shared_ptr< arrow::RecordBatch> ) pyarrow_unwrap_batch(PyObject *); /*proto*/