[Bug 231073] lang/python27: consumers cannot build with Clang in C++17 mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231073

            Bug ID: 231073
           Summary: lang/python27: consumers cannot build with Clang in
                    C++17 mode
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Keywords: needs-patch
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: python at FreeBSD.org
          Reporter: jbeich at FreeBSD.org
             Flags: maintainer-feedback?(python at FreeBSD.org)
          Assignee: python at FreeBSD.org

Consumers may want to switch to C++17 but some dependencies aren't ready for
Python 3.* or C++17 library may want to keep supporting Python 2.* in addition
to Python 3.*.

$ echo '#include <Python.h>' >a.cc
$ c++ -std=gnu++17 $(python2.7-config --cflags) -c a.cc
In file included from a.cc:1:
In file included from /usr/local/include/python2.7/Python.h:88:
/usr/local/include/python2.7/unicodeobject.h:534:5: error: ISO C++17 does not
allow 'register' storage class
      specifier [-Wregister]
    register PyObject *obj,     /* Object */
    ^~~~~~~~~
/usr/local/include/python2.7/unicodeobject.h:553:5: error: ISO C++17 does not
allow 'register' storage class
      specifier [-Wregister]
    register PyObject *obj      /* Object */
    ^~~~~~~~~
/usr/local/include/python2.7/unicodeobject.h:575:5: error: ISO C++17 does not
allow 'register' storage class
      specifier [-Wregister]
    register const wchar_t *w,  /* wchar_t buffer */
    ^~~~~~~~~
/usr/local/include/python2.7/unicodeobject.h:593:5: error: ISO C++17 does not
allow 'register' storage class
      specifier [-Wregister]
    register wchar_t *w,        /* wchar_t buffer */
    ^~~~~~~~~
In file included from a.cc:1:
In file included from /usr/local/include/python2.7/Python.h:97:
/usr/local/include/python2.7/stringobject.h:173:5: error: ISO C++17 does not
allow 'register' storage class
      specifier [-Wregister]
    register PyObject *obj,     /* string or Unicode object */
    ^~~~~~~~~
/usr/local/include/python2.7/stringobject.h:174:5: error: ISO C++17 does not
allow 'register' storage class
      specifier [-Wregister]
    register char **s,          /* pointer to buffer variable */
    ^~~~~~~~~
/usr/local/include/python2.7/stringobject.h:175:5: error: ISO C++17 does not
allow 'register' storage class
      specifier [-Wregister]
    register Py_ssize_t *len    /* pointer to length variable or NULL
    ^~~~~~~~~
7 errors generated.

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