mpd @0.20.5: error: *** A compiler with support for C++14 language features is required.

[jeblairpgh]

During a recent upgrade, macports reported that several ports had linking failures. When I gave permission to rebuild them, configuration of mpd failed.

--->  Fetching distfiles for mpd
--->  Verifying checksums for mpd
--->  Extracting mpd
--->  Configuring mpd
Error: Failed to configure mpd, consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_audio_mpd/mpd/work/mpd-0.20.5/config.log
Error: Failed to configure mpd: configure failure: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_audio_mpd/mpd/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port mpd failed

I tried cleaning, and uninstalling/reinstalling, but it's still giving me the error.

[jeblairpgh]

log file

[kencu (Ken)]

you'll need to install a newer compiler. Luckily, there are several.

try sudo port -v install clang-4.0 and assuming that goes without error, then try this:

first clean up:

sudo port clean mpd then try:

sudo port -v install mpd configure.compiler=macports-clang-4.0

If that works well for you and you don't want to be troubled by these kinds of errors in the future, you can look into setting your MacPorts default compiler to clang-4.0, and then you will not likely be troubled by this kind of error again.

All the best, K

[jeblairpgh]

Thank you so much! That fixed it!

[kencu (Ken)]

This port has no maintainer. I tested the build with clang-3.7, and that passes the c++14 test. So presumably we would blacklist something like clang < 700 and that should work.

There are other errors in this port, based on some assumed functions in the standard library that are not tested for on my older systems:

In file included from src/util/WStringCompare.cxx:21:
src/util/WStringAPI.hxx:110:10: error: use of undeclared identifier 'wcpcpy'; did you mean 'wcscpy'?
  return wcpcpy(dest, src);
         ^~~~~~
         wcscpy
/usr/include/wchar.h:149:10: note: 'wcscpy' declared here
wchar_t *wcscpy(wchar_t * __restrict, const wchar_t * __restrict);
         ^
In file included from src/util/WStringCompare.cxx:21:
src/util/WStringAPI.hxx:143:9: error: use of undeclared identifier 'wcsdup'
        return wcsdup(p);

but those are separate items and separate tickets.

[l2dy (Zero King)]

In 6c5664351a8cbd445fc2d4d5500de4a07273c452/macports-ports (master):

mpd: require a C++14 compatible compiler

Fixes: #54208