Add Zig language support

[e820]

Sigh, hopefully this time around.

I closed the previous iteration (#7984) due to personal time constraints at the time and want to commit
to making this the best I can now. This contains everything the previous iteration had, plus a few
fixes and adjustments to accomodate for changes in Meson.

This will be a draft for now as it's still somewhat of a WIP. I tested a few zig projects from GitHub
and they build nicely. Some things in particular I'd like feedback on:

• The rpath handling - it appears to be working however I'm not sure this is the correct approach.
  In particular the project test 2 sharedlib is failing during installation, it seems to be a
  install_name_tool related failure that I don't really know how to fix (see the logs below)

[0/1] Installing files.
Installing libhello.1.dylib to /Users/e820/Developer/meson/i _i1gsgsz/usr/lib
Installing zigtest-shared-lib to /Users/e820/Developer/meson/i _i1gsgsz/usr/bin
FAILED: meson-install
/opt/homebrew/opt/[email protected]/bin/python3.9 /Users/e820/Developer/meson/meson.py install --no-rebuild
ninja: build stopped: subcommand failed.


ninja explain: output libhello.1.dylib doesn't exist
ninja explain: libhello.1.dylib is dirty
ninja explain: libhello.1.dylib is dirty
ninja explain: zigtest-shared-lib is dirty

...

Command '['install_name_tool', '/Users/e820/Developer/meson/i _i1gsgsz/usr/bin/zigtest-shared-lib', '-delete_rpath', '/usr/lib']' returned non-zero exit status 1.

[lgtm-com]

This pull request introduces 1 alert when merging ae76a0b into 56c03e1 - view on LGTM.com

new alerts:

• 1 for Conflicting attributes in base classes

[lgtm-com]

This pull request introduces 1 alert when merging 1e06046 into 0b50c57 - view on LGTM.com

new alerts:

• 1 for Conflicting attributes in base classes

[RossComputerGuy]

What's the progress on this? I'm looking to be able to convert an existing project which uses Meson to slowly use Zig. However, it'd be a huge undertaking to move to build.zig. Calling the Zig compiler myself is doable but not the best. Having this support would be great.

[eli-schwartz]

The original question for feedback can't really be analyzed at the moment -- it's not clear how install_name_tool failed or even with what error message, all these years later :(

@dcbaker had an interest in the original PR #7984 so I wonder what happened later...

[dcbaker]

I have an updated version of this PR. I’ll link it later or open a new PR. The biggest two things I ran into at the time were that zig doesn’t any any kind of API stability in the stdlib, and a lack of depfile support that makes it hard to get reliable rebuilds

[dcbaker]

Closing this in favor of the rebased version