bad permissions in macho archive file

[vrischmann]

Zig Version

0.14.0

Steps to Reproduce and Observed Behavior

Hello,

Some context.

I'm working on an project where I have a "core" library in zig and a ui in Qt that will consume this.

This core library is made of C dependencies and Zig code that I build with the zig build system, each dependency and my code is its own .a file.

To simplify consuming these libraries in my ui code, I want to merge everything into a single "fat" library. Without going into too much details, I wrote a build system step that does that for me using zig ar x and then zig ar rcs.

This works fine on Linux but on macOS I've encountered an issue: the file permissions of the object files in the archive are all 0, see this zig ar tv foo.a output:

---------       0/0       1431776 Jan  1 01:00 1970 libzig_a_perm.a.o

and this has the effect that zir ar x foo.a produces files on the filesystem that all have 0 permissions has well:

$ ll
----------  1 vincent  staff  1431776 Mar  9 19:35 libzig_a_perm.a.o

I'm not sure if this is intended, however I tested producing a .a file with cmake+clang and the permissions are different there:

rw-r--r-- 501/20    536 Mar  7 00:32 2025 main.c.o

so this makes me think the permissions are wrong.

Expected Behavior

I'm not sure what to expect for permissions, I'm not that familiar with the archive format. But I think I at least expect the permissions to allow reads.