libgcc9: Error: gcc9 9.5.0 is not supported on Darwin 17 i386

[WolfgangFahl (Wolfgang Fahl)]

sudo port upgrade outdated

ends with the following show stopper on my Mac Os High Sierra

--->  Computing dependencies for libgcc9
--->  Fetching archive for libgcc9
--->  Attempting to fetch libgcc9-9.5.0_2.darwin_17.x86_64.tbz2 from http://packages.macports.org/libgcc9
--->  Attempting to fetch libgcc9-9.5.0_2.darwin_17.x86_64.tbz2 from http://fra.de.packages.macports.org/libgcc9
--->  Attempting to fetch libgcc9-9.5.0_2.darwin_17.x86_64.tbz2 from http://ema.uk.packages.macports.org/libgcc9
--->  Fetching distfiles for libgcc9
Error: gcc9 9.5.0 is not supported on Darwin 17 i386
Error: Failed to fetch libgcc9: incompatible macOS version
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_lang_gcc9/libgcc9/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe there
is a bug.

I'd love to know how i can at least partly keep my system up-to date e.g. forcing to ignore/skip errors like this or find out which applications i might need to deinstall or install old versions from a dmg or the like.

[ryandesign (Ryan Carsten Schmidt)]

(lib)gcc9 is not supported on macOS High Sierra anymore. Use a newer version of (lib)gcc.

Since the problem happened when upgrading ports, figure out which of your installed ports depends on (lib)gcc9 and see if the port offers a variant to use a newer (lib)gcc instead.

[WolfgangFahl (Wolfgang Fahl)]

Thanks for the hint. Next stop was ​https://apple.stackexchange.com/questions/38219/how-to-find-which-ports-depends-on-a-given-one-when-using-macports

[WolfgangFahl (Wolfgang Fahl)]

port dependents libgcc9
OpenBLAS depends on libgcc9
gcc9 depends on libgcc9
libgcc depends on libgcc9
libgcc8 depends on libgcc9

port dependents OpenBLAS
py27-numpy depends on OpenBLAS
py310-numpy depends on OpenBLAS
py37-numpy depends on OpenBLAS

since numpy is important for me i'd need a HighSierra compatible version of it.

[WolfgangFahl (Wolfgang Fahl)]

port info OpenBLAS
OpenBLAS @0.3.21_1 (math, science)
Sub-ports:            OpenBLAS-devel
Variants:             g95, gcc10, gcc11, [+]gcc12, gccdevel, [+]lapack, native,
                      universal

Description:          OpenBLAS is an optimized BLAS library based on GotoBLAS2
Homepage:             https://github.com/xianyi/OpenBLAS

Build Dependencies:   coreutils, gcc12
Library Dependencies: libgcc
Conflicts with:       OpenBLAS-devel
Platforms:            darwin
License:              BSD
Maintainers:          Email: nicos@macports.org, GitHub: NicosPavlov
                      Email: michaelld@macports.org, GitHub: michaelld
                      Policy: openmaintainer

[WolfgangFahl (Wolfgang Fahl)]

Trying sudo port install OpenBLAS +gcc11

[WolfgangFahl (Wolfgang Fahl)]

sudo port uninstall gcc9

[WolfgangFahl (Wolfgang Fahl)]

It would be good if the upgrade outdated failure would already suggest the steps.

[ryandesign (Ryan Carsten Schmidt)]

What steps, specifically, do you think the message should suggest? The message comes from the libgcc9 port. The libgcc9 port cannot suggest that you install OpenBLAS with the +gcc11 variant because the libgcc9 port does not know for what reason it was being installed/upgraded.