[MacPorts] #59791: mame @0.203: error: no member named 'experimental' in namespace 'std' (was: mame @0.203: no type named string_view)

[MacPorts]

#59791: mame @0.203: error: no member named 'experimental' in namespace 'std'
---------------------+--------------------
  Reporter:  Tatsh   |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:  mame    |
---------------------+--------------------
Changes (by ryandesign):

 * port:   => mame


Old description:

> It fails when building anything using the included asio library under
> 3rdparty.
>
> {{{
> :info:build
> ../../../../../3rdparty/asio/include/asio/ip/impl/address.ipp:139:22:
> error: unknown type name 's
> tring_view'; did you mean 'std::string_view'?
> :info:build address make_address(string_view str)
> :info:build                      ^~~~~~~~~~~
> :info:build                      std::string_view
> :info:build In file included from ../../../../../src/emu/http.cpp:1:
> :info:build In file included from ../../../../../src/emu/emu.h:29:
> }}}
>
> I'm on Catalina with Xcode 11 which may be causing this.

New description:

 It fails when building anything using the included asio library under
 3rdparty.

 {{{
 :info:build
 ../../../../../3rdparty/asio/include/asio/ip/impl/address.ipp:139:22:
 error: unknown type name 'string_view'; did you mean 'std::string_view'?
 :info:build address make_address(string_view str)
 :info:build                      ^~~~~~~~~~~
 :info:build                      std::string_view
 :info:build In file included from ../../../../../src/emu/http.cpp:1:
 :info:build In file included from ../../../../../src/emu/emu.h:29:
 }}}

 I'm on Catalina with Xcode 11 which may be causing this.

--

Comment:

 Looks like the first error in the log is actually:

 {{{
 :info:build
 ../../../../../3rdparty/asio/include/asio/detail/string_view.hpp:31:12:
 error: no member named 'experimental' in namespace 'std'
 :info:build using std::experimental::basic_string_view;
 :info:build       ~~~~~^
 :info:build
 ../../../../../3rdparty/asio/include/asio/detail/string_view.hpp:32:12:
 error: no member named 'experimental' in namespace 'std'
 :info:build using std::experimental::string_view;
 :info:build       ~~~~~^
 }}}

 In any case, This sounds like a problem that is not specific to MacPorts.
 I will update the port to the latest version, 0.216. If the problem
 persists with that version, please [https://github.com/mamedev/mame/issues
 report the problem to the developers]; they may need to update their
 bundled asio library.

-- 
Ticket URL: <https://trac.macports.org/ticket/59791#comment:1>
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