Ubuntu aarch64 build error: reached unreachable code

[Zorgatone]

Hello, I'm trying to configure libxev in my Zig project on a Ubuntu linux aarch64 guest VM on a macOS aarch64 host using OrbStack, and Zig version 0.14.0-dev.2989+bf6ee7cb3 (installed through ZVM from master branch)

I followed the guide (kinda) and I hope I didn't make some silly mistake here, this is what I did:

1. Ran command zig fetch --save git+https://github.com/mitchellh/libxev#main to automatically add this to the build.zig.zon file:

.dependencies = .{
    .libxev = .{
        .url = "git+https://github.com/mitchellh/libxev?ref=main#31eed4e337fed7b0149319e5cdbb62b848c24fbd",
        .hash = "1220ebf88622c4d502dc59e71347e4d28c47e033f11b59aff774ae5787565c40999c",
    },
},

2. The build.zig part in the documentation didn't work for me, complaining exe.addModule has no addModule function.

error: no field or member function named 'addModule' in 'Build.Step.Compile'
    exe.addModule("xev", xev.module("xev"));

So I checked what other libraries where doing, that I know were working for me and this is the changed code in build.zig:

const xev = b.dependency("libxev", .{ .target = target, .optimize = optimize });

exe.root_module.addImport("xev", xev.module("xev"));

Now that function exists, but I still have a build error as following:

/home/zorgatone/.cache/zig/p/1220ebf88622c4d502dc59e71347e4d28c47e033f11b59aff774ae5787565c40999c/build.zig:347:52: error: reached unreachable code
    return std.fs.path.dirname(@src().file) orelse unreachable;
                                                   ^~~~~~~~~~~
/home/zorgatone/.cache/zig/p/1220ebf88622c4d502dc59e71347e4d28c47e033f11b59aff774ae5787565c40999c/build.zig:208:58: note: called from here
    var c_dir = try std.fs.cwd().openDir(comptime thisDir() ++ "/" ++ c_dir_path, .{ .iterate = true });
                                                  ~~~~~~~^~
referenced by:
    build: /home/zorgatone/.cache/zig/p/1220ebf88622c4d502dc59e71347e4d28c47e033f11b59aff774ae5787565c40999c/build.zig:183:25
    runBuild__anon_68475: /home/zorgatone/.zvm/master/lib/std/Build.zig:2428:44
    10 reference(s) hidden; use '-freference-trace=12' to see all references

I also tried removing these folders, but it didn't fix anything: ./zig-out, ./.zig-cache/ and ~/.cache/zig/

What could be wrong?

These are my system specs for macOS:

                     ..'          zorgatone@TomBookinProMax
                 ,xNMM.           -------------------------
               .OMMMMo            OS: macOS Sequoia 15.2 arm64
               lMM"               Host: MacBook Pro (16-inch, 2024, Three Thunderbolt 5 ports)
     .;loddo:.  .olloddol;.       Kernel: Darwin 24.2.0
   cKMMMMMMMMMMNWMMMMMMMMMM0:     Uptime: 7 hours, 51 mins
 .KMMMMMMMMMMMMMMMMMMMMMMMWd.     Packages: 131 (brew)
 XMMMMMMMMMMMMMMMMMMMMMMMX.       Shell: zsh 5.9
;MMMMMMMMMMMMMMMMMMMMMMMM:        Display (S235HL): 1920x1080 @ 60 Hz in 23" [External] *
:MMMMMMMMMMMMMMMMMMMMMMMM:        Display (Color LCD): 2992x1934 @ 120 Hz (as 1496x967) in 16" [Built-in]
.MMMMMMMMMMMMMMMMMMMMMMMMX.       DE: Aqua
 kMMMMMMMMMMMMMMMMMMMMMMMMWd.     WM: Quartz Compositor 278.2.7
 'XMMMMMMMMMMMMMMMMMMMMMMMMMMk    WM Theme: Multicolor (Dark)
  'XMMMMMMMMMMMMMMMMMMMMMMMMK.    Font: .AppleSystemUIFont [System], Helvetica [User]
    kMMMMMMMMMMMMMMMMMMMMMMd      Cursor: Fill - Black, Outline - White (32px)
     ;KMMMMMMMWXXWMMMMMMMk.       Terminal: ghostty 1.1.0
       "cooc*"    "*coo'"         Terminal Font: MesloLGS NF (13pt)
                                  CPU: Apple M4 Max (16) @ 4.51 GHz
                                  GPU: Apple M4 Max (40) @ 1.58 GHz [Integrated]
                                  Memory: 24.41 GiB / 64.00 GiB (38%)
                                  Swap: Disabled
                                  Disk (/): 374.94 GiB / 1.81 TiB (20%) - apfs [Read-only]
                                  Local IP (en7): 192.168.1.7/24
                                  Battery (bq40z651): 100% [AC connected]
                                  Power Adapter: 140W USB-C Power Adapter
                                  Locale: en_US.UTF-8

These are the linux VM specs:

                            ....               zorgatone@ubuntu
              .',:clooo:  .:looooo:.           ----------------
           .;looooooooc  .oooooooooo'          OS: Ubuntu oracular 24.10 aarch64
        .;looooool:,''.  :ooooooooooc          Kernel: Linux 6.12.10-orbstack-00297-gf8f6e015b993
       ;looool;.         'oooooooooo,          Uptime: 23 mins
      ;clool'             .cooooooc.  ,,       Packages: 596 (dpkg), 2 (snap)
         ...                ......  .:oo,      Shell: zsh 5.9
  .;clol:,.                        .loooo'     Theme: Yaru [GTK3]
 :ooooooooo,                        'ooool     Icons: Yaru [GTK3]
'ooooooooooo.                        loooo.    Cursor: Adwaita
'ooooooooool                         coooo.    Terminal: orbstack-agent: ubuntu
 ,loooooooc.                        .loooo.    CPU: Apple (16) @ 2.00 GHz
   .,;;;'.                          ;ooooc     Memory: 579.75 MiB / 15.66 GiB (4%)
       ...                         ,ooool.     Swap: 0 B / 16.66 GiB (0%)
    .cooooc.              ..',,'.  .cooo.      Disk (/): 10.45 GiB / 1.39 TiB (1%) - btrfs
      ;ooooo:.           ;oooooooc.  :l.       Local IP (eth0): 198.19.249.121/24 *
       .coooooc,..      coooooooooo.           Locale: en_US.UTF-8
         .:ooooooolc:. .ooooooooooo'
           .':loooooo;  ,oooooooooc
               ..';::c'  .;loooo:'

Thank you

[Zorgatone]

Looks like this PR fixes my problem (when it's going to be merged): #139