GeezerVison

.. date: 2022-04-26-16-51-31
.. gh-issue: 91320
.. nonce: QDHmTv
.. section: C API

Fix C++ compiler warnings about "old-style cast" (``g++ -Wold-style-cast``)
in the Python C API. Use C++ ``reinterpret_cast<>`` and ``static_cast<>``
casts when the Python C API is used in C++. Patch by Victor Stinner.

      In file included from /home/tcaswell/.pybuild/bleeding/include/python3.12/Python.h:38,
                       from numpy/core/include/numpy/npy_common.h:5,
                       from numpy/core/include/numpy/npy_math.h:8,
                       from numpy/core/src/npysort/selection.cpp:18:
      /home/tcaswell/.pybuild/bleeding/include/python3.12/pyport.h:31:1: error: template with C linkage
         31 | template <typename type, typename expr_type>
            | ^~~~~~~~
      numpy/core/include/numpy/npy_math.h:5:1: note: ‘extern "C"’ linkage started here
          5 | extern "C" {
            | ^~~~~~~~~~
      /home/tcaswell/.pybuild/bleeding/include/python3.12/pyport.h:36:1: error: template with C linkage
         36 | template <typename type, typename expr_type>
            | ^~~~~~~~
      numpy/core/include/numpy/npy_math.h:5:1: note: ‘extern "C"’ linkage started here
          5 | extern "C" {
            | ^~~~~~~~~~
      /home/tcaswell/.pybuild/bleeding/include/python3.12/pyport.h:41:1: error: template with C linkage
         41 | template <typename type, typename expr_type>
            | ^~~~~~~~
      numpy/core/include/numpy/npy_math.h:5:1: note: ‘extern "C"’ linkage started here
          5 | extern "C" {
            | ^~~~~~~~~~
      /home/tcaswell/.pybuild/bleeding/include/python3.12/pyport.h:46:1: error: template with C linkage
         46 | template <typename type, typename expr_type>
            | ^~~~~~~~
      numpy/core/include/numpy/npy_math.h:5:1: note: ‘extern "C"’ linkage started here
          5 | extern "C" {
            | ^~~~~~~~~~

g++ -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -DNPY_INTERNAL_BUILD=1 -DHAVE_NPY_CONFIG_H=1 -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE=1 -D_LARGEFILE64_SOURCE=1 -DNO_ATLAS_INFO=1 -DHAVE_CBLAS -I/usr/local/include -I/home/tcaswell/.virtualenvs/bleeding/include -Ibuild/src.linux-x86_64-3.12/numpy/core/src/multiarray -Ibuild/src.linux-x86_64-3.12/numpy/core/src/common -Ibuild/src.linux-x86_64-3.12/numpy/core/src/umath -Inumpy/core/include -Ibuild/src.linux-x86_64-3.12/numpy/core/include/numpy -Ibuild/src.linux-x86_64-3.12/numpy/distutils/include -Ibuild/src.linux-x86_64-3.12/numpy/core/src/npysort -Inumpy/core/src/common -Inumpy/core/src -Inumpy/core -Inumpy/core/src/npymath -Inumpy/core/src/multiarray -Inumpy/core/src/umath -Inumpy/core/src/npysort -Inumpy/core/src/_simd -I/home/tcaswell/.virtualenvs/bleeding/include -I/home/tcaswell/.pybuild/bleeding/include/python3.12 -Ibuild/src.linux-x86_64-3.12/numpy/core/src/common -Ibuild/src.linux-x86_64-3.12/numpy/core/src/npymath -c numpy/core/src/npysort/selection.cpp -o build/temp.linux-x86_64-3.12/numpy/core/src/npysort/selection.o -MMD -MF build/temp.linux-x86_64-3.12/numpy/core/src/npysort/selection.o.d -msse -msse2 -msse3 -std=c++11 -D__STDC_VERSION__=0 -fno-exceptions -fno-rtti