[Bug 271488] devel/boost-libs: apply upstream patch for C++17 support

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271488

--- Comment #3 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/ports/commit/?id=c035007f958a9fa3c45bb1441a63540be39018ed

commit c035007f958a9fa3c45bb1441a63540be39018ed
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2023-05-18 13:10:20 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2023-05-18 21:33:57 +0000

    devel/boost-libs: apply upstream patch for C++17 support

    Since clang 16 (and gcc 11) the default C++ standard is now gnu++17.
    Several ports that use boost/functional.hpp now complain with (for
    example print/libmspub01):

      In file included from MSPUBCollector.cpp:17:
      In file included from /usr/local/include/boost/multi_array.hpp:34:
      In file included from
/usr/local/include/boost/multi_array/multi_array_ref.hpp:32:
      /usr/local/include/boost/functional.hpp:45:24: error: no member named
'unary_function' in namespace 'std'; did you mean '__unary_function'?
                  using std::unary_function;
                        ~~~~~^~~~~~~~~~~~~~
                             __unary_function
      /usr/include/c++/v1/__functional/unary_function.h:46:1: note:
'__unary_function' declared here
      using __unary_function = __unary_function_keep_layout_base<_Arg,
_Result>;
      ^
      In file included from MSPUBCollector.cpp:17:
      In file included from /usr/local/include/boost/multi_array.hpp:34:
      In file included from
/usr/local/include/boost/multi_array/multi_array_ref.hpp:32:
      /usr/local/include/boost/functional.hpp:46:24: error: no member named
'binary_function' in namespace 'std'; did you mean '__binary_function'?
                  using std::binary_function;
                        ~~~~~^~~~~~~~~~~~~~~
                             __binary_function
      /usr/include/c++/v1/__functional/binary_function.h:49:1: note:
'__binary_function' declared here
      using __binary_function = __binary_function_keep_layout_base<_Arg1,
_Arg2, _Result>;
      ^

    This is because std::unary_function and std::binary_function were
    removed from C++17. Upstream boost/functional fixed this in
    https://github.com/boostorg/functional/commit/6a573e4, so apply that
    patch until boost 1.83.0 is released with it.

    PR:             271488
    Approved by:    fluffy (maintainer)
    MFH:            2023Q2

 devel/boost-libs/Makefile                          |  2 +-
 .../files/patch-boost_functional.hpp (new)         | 28 ++++++++++++++++++++++
 2 files changed, 29 insertions(+), 1 deletion(-)

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