libgcc10 cannot be built on Big Sur with Apple Silicon

[Gregory-Gelfond (Gregory Gelfond)]

Invoking the command sudo port install py38-matplotlib +cairo +ghostscript +latex +tkinter +webagg fails due to issues with libgcc10:

--->  Attempting to fetch libgcc10-10.2.0_3.darwin_20.arm64.tbz2 from https://packages.macports.org/libgcc10
--->  Attempting to fetch libgcc10-10.2.0_3.darwin_20.arm64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/gcc10/libgcc10
--->  Attempting to fetch libgcc10-10.2.0_3.darwin_20.arm64.tbz2 from https://mse.uk.packages.macports.org/libgcc10
--->  Fetching distfiles for libgcc10
Error: gcc10 10.2.0 is not supported on Darwin 20 arm
Error: Failed to fetch libgcc10: incompatible OS X version
Error: 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.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port py38-matplotlib failed

I've attached the main.log file for reference.

[ryandesign (Ryan Carsten Schmidt)]

Correct. As it says, "gcc10 10.2.0 is not supported on Darwin 20 arm". A future version of gcc will hopefully be compatible with Apple Silicon Macs.

[kencu (Ken)]

see #61636 for some progress on this...