Missing aarch64-linux-musl on RubyGems.org for > 22.7.0.1

[tisba]

Probably already known, just wanted to make sure it's tracked…

I was looking at why builds broke for mini_racer for aarch64-arm musl, e.g. https://github.com/rubyjs/mini_racer/actions/runs/10763648835. Looks like no aarch64-linux-musl packages got pushed to rubygems (>= 22.5.1.0): https://rubygems.org/gems/libv8-node/versions

I don't quite understand how rubygems works in regards to resolving this, but it looks like it's falling back to libv8-node-22.7.0.3-aarch64-linux and then failing (on aarch64 alpine, rubygems 3.5.18, Ruby 3.3.5):

$ gem install mini_racer --version 0.17.0.pre
Fetching mini_racer-0.17.0.pre.gem
Fetching libv8-node-22.7.0.3-aarch64-linux.gem
Successfully installed libv8-node-22.7.0.3-aarch64-linux
Building native extensions. This could take a while...
ERROR:  Error installing mini_racer:
	ERROR: Failed to build gem native extension.

    current directory: /usr/local/bundle/gems/mini_racer-0.17.0.pre/ext/mini_racer_extension
/usr/local/bin/ruby extconf.rb
checking for -lpthread... yes
checking for whether -Wl,--exclude-libs=ALL  is accepted as LDFLAGS... no
creating Makefile

current directory: /usr/local/bundle/gems/mini_racer-0.17.0.pre/ext/mini_racer_extension
make DESTDIR\= sitearchdir\=./.gem.20240909-122-f6akgp sitelibdir\=./.gem.20240909-122-f6akgp clean

current directory: /usr/local/bundle/gems/mini_racer-0.17.0.pre/ext/mini_racer_extension
make DESTDIR\= sitearchdir\=./.gem.20240909-122-f6akgp sitelibdir\=./.gem.20240909-122-f6akgp
compiling mini_racer_extension.cc
mini_racer_extension.cc: In function 'VALUE rb_heap_snapshot(VALUE, VALUE)':
mini_racer_extension.cc:1659:35: warning: 'rb_io::fd' is deprecated: rb_io_descriptor [-Wdeprecated-declarations]
 1659 |     FileOutputStream stream(fptr->fd);
      |                                   ^~
In file included from mini_racer_extension.cc:4:
/usr/local/include/ruby-3.3.0/ruby/io.h:154:9: note: declared here
  154 |     int fd;
      |         ^~
mini_racer_extension.cc:1659:35: warning: 'rb_io::fd' is deprecated: rb_io_descriptor [-Wdeprecated-declarations]
 1659 |     FileOutputStream stream(fptr->fd);
      |                                   ^~
/usr/local/include/ruby-3.3.0/ruby/io.h:154:9: note: declared here
  154 |     int fd;
      |         ^~
mini_racer_extension.cc:1659:35: warning: 'rb_io::fd' is deprecated: rb_io_descriptor [-Wdeprecated-declarations]
 1659 |     FileOutputStream stream(fptr->fd);
      |                                   ^~
/usr/local/include/ruby-3.3.0/ruby/io.h:154:9: note: declared here
  154 |     int fd;
      |         ^~
linking shared-object mini_racer_extension.so
/usr/lib/gcc/aarch64-alpine-linux-musl/13.2.1/../../../../aarch64-alpine-linux-musl/bin/ld: cannot find /usr/local/bundle/gems/libv8-node-22.7.0.3-aarch64-linux/vendor/v8/aarch64-linux-musl/libv8/obj/libv8_monolith.a: No such file or directory
collect2: error: ld returned 1 exit status
make: *** [Makefile:265: mini_racer_extension.so] Error 1

make failed, exit code 2

Gem files will remain installed in /usr/local/bundle/gems/mini_racer-0.17.0.pre for inspection.
Results logged to /usr/local/bundle/extensions/aarch64-linux-musl/3.3.0/mini_racer-0.17.0.pre/gem_make.out

[tisba]

Is there a reason why we stopped publishing aarch64-linux-musl packages to rubygems? This is currently breaking linux-arm64 musl builds for mini_racer.

ping @lloeki / @SamSaffron

[lloeki]

cross-compiling, which is a PITA with GCC (on Debian there's one in repo, but on Alpine you have to compile one).

but now there are GHA ARM runners so cross-compiling can be eschewed: https://github.com/DataDog/graft-rb/blob/55952c2e28d36f93f88fd8c0b885e09b1e3b9dd5/.github/workflows/nix.yml#L12-L25

[LenaWil]

I am sorry for asking, but is there a quick fix for mini_racer?

[tisba]

but now there are GHA ARM runners so cross-compiling can be eschewed

yeah, but availability in the public preview seems to be rather spotty. I tried to use them in some projects, also in rubyjs/mini_racer#341. Maybe it's too early to rely on them yet 🤷

[tisba]

I am sorry for asking, but is there a quick fix for mini_racer?

Other than compiling libv8 from source (not recommended)? Not really. Note that this should only be a problem on alpine/musl currently.

[tisba]

I take my comment back, I had a typo in the runs-on field. I think the ARM runners are worth a shot, @lloeki!