darwin awk error / warning CFPropertyListCreateFromXMLData

[n8henrie]

Describe the bug

I'm seeing an unusual error when using OFS = FS with GNU awk on aarch64-darwin (no such issue on x86_64-linux).

2024-04-28 07:52:50.450 awk[61732:72598624] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary on line 1. Parsing will be abandoned. Break on _CFPropertyListMissingSemicolon to debug.

It initially came up when sourcing this bash completion for skim upon opening a new shell in Alacritty: https://github.com/lotabout/skim/blob/291fc34c58b1670a5e8c95f1e8f930b82c030b19/shell/completion.bash#L52 -- I was able to narrow it down to the line awk -F= '{OFS = FS}' line.

I was able to make an MRE:

#!/run/current-system/sw/bin/nix-shell
#!nix-shell -I nixpkgs=flake:github:nixos/nixpkgs/2b1f64b358f2cab62617f26b3870fd0ee375d848
#!nix-shell -i bash -p bash --pure

true | awk -F= '{OFS = FS}'

Running it on aarch64-darwin shows:

$ ./mre.sh
2024-04-28 07:57:24.455 awk[64319:72647290] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary on line 1. Parsing will be abandoned. Break on _CFPropertyListMissingSemicolon to debug.
2024-04-28 07:57:24.455 awk[64319:72647290] CFPropertyListCreateFromXMLData(): Old-style plist parser: missing semicolon in dictionary on line 1. Parsing will be abandoned. Break on _CFPropertyListMissingSemicolon to debug.

Simply adding a semicolon: ('{OFS = FS;}') makes this go away:

$ ./mre.sh
$ echo $?
0

I have no idea why it's complaining about a plist parser. Any of the @NixOS/darwin-maintainers know why this would happen?

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

$ nix-info -m
 - system: `"aarch64-darwin"`
 - host os: `Darwin 23.4.0, macOS 14.4.1`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.19.4`
 - channels(n8henrie): `""`
 - channels(root): `""`
 - nixpkgs: `/nix/store/xqn0rqq0is1kvgj9q57lz29k5nrf587h-source`

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