et @6.1.7: builds failing for all macOS releases earlier than 10.15

[mascguy (Christopher Nielsen)]

​https://ports.macports.org/port/et/builds

Failures are occurring on the buildbots, as well as locally.

Error appears to be:

.../work/EternalTerminal-6.1.7/src/base/Headers.hpp:88:10: fatal error: 'experimental/filesystem' file not found
#include <experimental/filesystem>
         ^~~~~~~~~~~~~~~~~~~~~~~~~

[l2dy (Zero King)]

There are two types of error. This one is a "bug" in base that compiler.cxx_standard 2017 is not enforced and <filesystem> is missing.

[ryandesign (Ryan Carsten Schmidt)]

MacPorts base does "enforce" all values of compiler.cxx_standard to the extent that it makes sure that a compiler that it believes is compatible with that standard is used. It is of course possible that MacPorts base contains inaccurate information about which compilers support which C++ standard. See for example [e641f42a9f6d93e1768bd91785d19467c30ddb02/macports-base].

The error I see in the log is:

error: 'exists' is unavailable: introduced in macOS 10.15

In that case, no amount of using different compilers will help if the functionality that is required is not present in (the C++ standard library of) earlier OS versions.

[l2dy (Zero King)]

Replying to ryandesign:

In that case, no amount of using different compilers will help if the functionality that is required is not present in (the C++ standard library of) earlier OS versions.

Yes, but if I remove these function calls it could be fixed.

[l2dy (Zero King)]

Fixed with [5019ae4808e1386db5f14e63283de1fc022f8a22/macports-ports].