libgcc10 fails to build on Big Sur

[jserio1869]

Attempting to install gcc5, which has libgcc10 as a dependency. I get to this point in the main.log, where it issues a libgcc10 incompatible error.

I listed this as a ticket because I did not see any specific libgcc10 build error tickets, although I did see the general gcc build tickets. Thanks.

:notice:fetch --->  Fetching distfiles for libgcc10
:debug:fetch Executing proc-pre-org.macports.fetch-fetch-0
:error:fetch gcc10 10.2.0 is not supported on Darwin 20 arm
:error:fetch Failed to fetch libgcc10: incompatible OS X version
:debug:fetch Error code: NONE
:debug:fetch Backtrace: incompatible OS X version
:debug:fetch     while executing
:debug:fetch "$pre $targetname"
:error:fetch See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc10/libgcc10/main.log for details.

[jmroot (Joshua Root)]

The message is completely correct, gcc 10 (and all prior gcc versions) does not support macOS on ARM. Support is due to be added in gcc 11, for which a development snapshot is available in the gcc-devel port.