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Zig fails to cache linker warnings #30563

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opened 2025-12-22 08:18:34 +01:00 by sagehane · 0 comments
sagehane commented 2025-12-22 08:18:34 +01:00
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Version

Tested most recently on the following:

$ zig version
0.16.0-dev.1484+d0ba6642b

Has been an issue since at least 0.13.0 and probably far earlier.

Relevant GitHub issues and comments

Disparity between self-hosted and LLD linker

The reason why I figured it might be worth migrating the issue to continue the discussion. Could be fleshed out as its own issue, I guess.

I noticed that the self-hosted x86_64 linker behaves differently from the LLD:

main.zig:

pub const _start = {};

$ zig build-exe -fno-lld main.zig

$ zig build-exe -fllvm -flld main.zig # LLD not compatible with the self-hosted backend
warning(link): unexpected LLD stderr:
ld.lld: warning: cannot find entry symbol _start; not setting start address
### Version Tested most recently on the following: ``` $ zig version 0.16.0-dev.1484+d0ba6642b ``` Has been an issue since at least `0.13.0` and probably far earlier. ### Relevant GitHub issues and comments - https://github.com/ziglang/zig/issues/21416 (direct duplicate to migrate) - https://github.com/ziglang/zig/issues/14962#issuecomment-2126663571 - https://github.com/ziglang/zig/issues/10800 (About C warnings and not linkers, but the discussion on whether the build system should attempt to cache warnings or instead convert warnings to errors is relevant) ### Disparity between self-hosted and LLD linker The reason why I figured it might be worth migrating the issue to continue the discussion. Could be fleshed out as its own issue, I guess. I noticed that the self-hosted x86_64 linker behaves differently from the LLD: `main.zig`: ```zig pub const _start = {}; ``` ```sh-session $ zig build-exe -fno-lld main.zig ``` ```sh-session $ zig build-exe -fllvm -flld main.zig # LLD not compatible with the self-hosted backend warning(link): unexpected LLD stderr: ld.lld: warning: cannot find entry symbol _start; not setting start address ```
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