clang-12 @12.0.1 +analyzer+libstdcxx fails in patch stage

[p-bro]

Building current version of clang-12 fails to build on Mac OS 11.6 (Apple M1) in patch stage with the following error:

:error:patch Failed to patch clang-12: can't read "gcc_subdirectory_x86_64": no such variable
:debug:patch Error code: NONE
:debug:patch Backtrace: can't read "gcc_subdirectory_x86_64": no such variable
:debug:patch     while executing
:debug:patch "$post $targetname"

Full log is attached.

This happened during an attempt to restore the port selection from a computer running Catalina on a new Mac using the ​Migration procedure.

[p-bro]

clang-12 build log

[kencu (Ken)]

Yes, that could happen. On Catalina, clang-12 defaults to using the +libstdcxx variant. But on an M1, that variant is not supposed to be used so it is not defaulted on:

​https://github.com/macports/macports-ports/blob/47a76de2d0f5d7974c8d8ae09fff976b2ec03d56/lang/llvm-12/Portfile#L465

Please just do this:

sudo port clean clang-12
sudo port install clang-12

and it should work fine, and then you can go on and restore the rest of your list.

I could make the variant invisible on M1, but I was hoping that we might possibly get it to work at some point so I left it as a non-default variant that I might come back to work on later.

But that seems unlikely to ever happen, indeed, so I'll look at just making it disappear from M1s.

[p-bro]

Removing the +libstdcxx variant indeed solved the problem. Thank you.

[cjones051073 (Chris Jones)]

Issue with this variant is now addressed, plus it is anyway no longer enabled by default where it is not needed (which is the vast majority of cases).