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Support debug infos from adjacent .dSYM for apple targets in std.debug #31797

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opened 2026年04月09日 16:42:15 +02:00 by cerisier · 4 comments
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For Apple targets, my understanding is that debug infos are loaded from files which location is referenced by N_OSO symtab entries.

While this works fine on dev environments, the referenced transient .o may not exist in the future for various reasons (cache removed, binary is distributed or copied to another machine).

Would it make sense to support loading debug info from an adjacent .dSYM file if it exists?
This would allow users to generate a companion .dSYM adjacent to the binary.
See https://developer.apple.com/documentation/xcode/building-your-app-to-include-debugging-information

The generation of .dSYM would be the responsibility of the user, but support for reading .dSYM (if it exists) would be baked in zig.

For Apple targets, my understanding is that debug infos are loaded from files which location is referenced by `N_OSO` symtab entries. While this works fine on dev environments, the referenced transient `.o` may not exist in the future for various reasons (cache removed, binary is distributed or copied to another machine). Would it make sense to support loading debug info from an adjacent `.dSYM` file if it exists? This would allow users to generate a companion `.dSYM` adjacent to the binary. See https://developer.apple.com/documentation/xcode/building-your-app-to-include-debugging-information The generation of `.dSYM` would be the responsibility of the user, but support for reading `.dSYM` (if it exists) would be baked in zig.
cerisier changed title from (削除) Support parsing adjacent dSYM for apple targets (削除ここまで) to Support debug infos from adjacent .dSYM for apple targets 2026年04月09日 19:52:12 +02:00

To be clear, are you talking about linking or std.debug stack tracing?

To be clear, are you talking about linking or `std.debug` stack tracing?
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Sorry, I meant for std.debug stack tracing yes.

Sorry, I meant for `std.debug` stack tracing yes.
alexrp changed title from (削除) Support debug infos from adjacent .dSYM for apple targets (削除ここまで) to Support debug infos from adjacent .dSYM for apple targets in std.debug 2026年04月11日 09:52:08 +02:00
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If that's something you're willing to accept from foreign contributions, I feel confident to work on an implementation after reading a lot of code in this area of zig for #31821.

I can submit the general idea for validation before I proceed.

If that's something you're willing to accept from foreign contributions, I feel confident to work on an implementation after reading a lot of code in this area of zig for #31821. I can submit the general idea for validation before I proceed.
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cc @alexrp if this is in your area of review ! I made #35582

cc @alexrp if this is in your area of review ! I made https://codeberg.org/ziglang/zig/pulls/35582
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