[MacPorts] #71841: btop fails to build on Sequioa arm64: source_location not found

[MacPorts]

#71841: btop fails to build on Sequioa arm64: source_location not found
--------------------+--------------------
 Reporter:  ednl    |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  btop
--------------------+--------------------
 {{{
 In file included from src/btop_theme.cpp:23:
 :info:build src/btop_tools.hpp:40:10: fatal error: 'source_location' file
 not found
 :info:build    40 | #include <source_location>
 :info:build       |          ^~~~~~~~~~~~~~~~~
 }}}

 It seems to be part of the C++20 standard:
 https://en.cppreference.com/w/cpp/utility/source_location but does have a
 feature-test macro (mentioned on that page). Either it's not available in
 Apple clang 16 arm64, or the compilation command is wonky; there were a
 lot of "warning: argument unused/unknown". See attached main.log.

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Ticket URL: <https://trac.macports.org/ticket/71841>
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