Cannot compile gfortran (or even libgcc7) under Catalina

[thepeteriley (Pete Riley)]

Following the instructions, including a clean install of Catalina and a clean install of Macports, after getting a first round of errors, then forcibly deactivating libunwind-headers, the installation of gfortran continued until:

--->  Building libgcc7
Error: Failed to build libgcc7: command execution failed
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc7/libgcc7/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port gcc6 failed

I'm happy to send a full log if needed, but I don't want to bog this message down with it unless it's necessary.

Thanks!

[thepeteriley (Pete Riley)]

This is my first ticket to macports (I've never encountered an issue that I couldn't resolve in the past :)), please let me know if the information is useful and/or whether it should have been posted somewhere else?

[kencu (Ken)]

Thank you for the report!

Unfortunately, gcc has so far only made gcc9 compatible with Catalina. Perhaps you might be able to use gcc9 in your project.

gcc9 should be the current default, but if you're upgrading from older installations, you might still be calling in gcc7, which does not work on Catalina at present.

We don't yet have a timeline on when or if gcc7 will work with Catalina.