gcc10 fails to compile on macOS 12.3 Monterey, Xcode 13.3 on arm64 (M1 Max)

[ChristopherMayes (Christopher Mayes)]

port install gcc10 fails on macOS 12.3, Xcode 13.3 on arm64 (M1 Max). gcc11 does compile.

[ryandesign (Ryan Carsten Schmidt)]

I think that's pretty well known. Use gcc-devel (gcc12) or later on Apple Silicon.

[ChristopherMayes (Christopher Mayes)]

Hi Ryan, thanks. After completely removing macports and reinstalling, I can install gcc-devel.

But, how do I find out that this is well-known? Are there discussions or notes somewhere?

[ryandesign (Ryan Carsten Schmidt)]

I feel like there have been other tickets about it, maybe mailing list discussion. For example searching tickets for port contains gcc10 I found #64372 which is about gcc10 failing on macOS Monterey. And searching for port contains gcc and summary contains arm I found #63148 about gcc11 (and thus probably earlier versions too) being completely nonfunctional on Apple Silicon. Searching for port contains gcc and keywords contains arm64 turned up #63780 about libgcc11 failing to build on Apple Silicon.

However it would be good if the ports were modified so that they would let you know if they won't work on a particular platform.

[kencu (Ken)]

See also ​https://github.com/iains/gcc-10-branch and ​https://github.com/iains/gcc-10-branch/issues/4 where Iain has fixed gcc10, at least, for Monterey. It says also for arm64, but I haven't verified that myself as I have no arm64 Apple system as yet.

I can't tell if there is an arm64 working branch for gcc11 there too <​https://github.com/iains/gcc-11-branch>, but homebrew has gcc11 working on arm64 <​https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/gcc.rb> so it appears possible.

[kencu (Ken)]

Oh, we are using homebrew's gcc11 fork on arm64, so presumably that works or we would not be:

​https://github.com/macports/macports-ports/blob/8de606c392730aa2e77d24f74201caa21e87166b/lang/gcc11/Portfile#L46

[cjones051073 (Chris Jones)]

Now resolved.