[MacPorts] #59407: libgcc8 not installable and upgrade blocker for macOS 10.15 Catalina

[MacPorts]

#59407: libgcc8 not installable and upgrade blocker for macOS 10.15 Catalina
-------------------------------------+---------------------
 Reporter:  razvand                  |      Owner:  (none)
     Type:  defect                   |     Status:  new
 Priority:  Normal                   |  Milestone:
Component:  ports                    |    Version:  2.6.1
 Keywords:  libgcc8, macOS Catalina  |       Port:  libgcc8
-------------------------------------+---------------------
 I'm upgrading ports on macOS 10.15 Catalina from macOS 10.14 Mojave.
 Although I've uninstalled `libgcc8` and `gcc8` I get this error when
 running `sudo port upgrade outdated`:

 {{{
 razvan at jotunn:~$ sudo port upgrade outdated
 --->  Computing dependencies for libgcc8
 --->  Fetching archive for libgcc8
 --->  Attempting to fetch libgcc8-8.3.0_5.darwin_19.x86_64.tbz2 from
 https://packages.macports.org/libgcc8
 --->  Attempting to fetch libgcc8-8.3.0_5.darwin_19.x86_64.tbz2 from
 http://nue.de.packages.macports.org/libgcc8
 --->  Attempting to fetch libgcc8-8.3.0_5.darwin_19.x86_64.tbz2 from
 http://lil.fr.packages.macports.org/libgcc8
 --->  Fetching distfiles for libgcc8
 Error: gcc8 8.3.0 is (currently) not supported on Darwin 19
 Error: See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90835 for more
 details
 Error: Until the issue is addressed in Xcode, please instead install gcc9
 / libgcc9
 Error: Failed to fetch libgcc8: incompatible OS X version
 Error: See
 /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc8/libgcc8/main.log
 for details.
 Error: Problem while installing libgcc8
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.

 razvan at jotunn:~$ sudo port dependents libgcc8
 Error: Registry error: libgcc8 not registered as installed.
 }}}

 I've previously installed `libgcc9` and `gcc9` but that doesnt't help.
 {{{
 razvan at jotunn:~$ sudo port install libgcc9 gcc9
 --->  Computing dependencies for libgcc9
 --->  Cleaning libgcc9
 --->  Computing dependencies for gcc9
 --->  Cleaning gcc9
 --->  Scanning binaries for linking errors
 --->  No broken files found.
 --->  No broken ports found.
 razvan at jotunn:~$
 }}}

 What should I do to be upgrade outdated packages?

-- 
Ticket URL: <https://trac.macports.org/ticket/59407>
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