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Add instructions for using Wild with Rust on Illumos.#1171

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davidlattimore merged 1 commit into
wild-linker:mainfrom
daniel-levin:illumos_explainer
Oct 8, 2025
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Add instructions for using Wild with Rust on Illumos.#1171
davidlattimore merged 1 commit into
wild-linker:mainfrom
daniel-levin:illumos_explainer

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@daniel-levin

@daniel-levin daniel-levin commented Oct 8, 2025

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The actual, correct resolution to #1153. It turns out that Clang is very picky and platform-dependent about delegating to arbitrary linkers. Mercifully, Clang will still provide GNU-ld compatible arguments to Wild. As such there is no need to understand Sun ld's argument parser.

@daniel-levin

daniel-levin commented Oct 8, 2025 •
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For those interested in this tooth-pulling exercise, it's worth noting that Clang and GCC's treatment of -fuse-ld is even more different and platform-specific than the comments in integration_tests.rs suggest. Concretely, On Illumos, gcc (gcc (OmniOS 151054/14.2.0-il-1) 14.2.0 ) will joyfully but erroneously pass Sun ld flags to lld, gold, and even GNU bfd (go figure) if you use the -fuse-ld argument.

Driver Argument Result
clang None Uses Sun ld with valid and correct arguments
clang -fuse-ld=/absolute/path/wild Uses Wild at the absolute path, with GNU ld-compatible arguments 🥳 (but one aberrant -C)
clang -fuse-ld=wild Fails, moaning about invalid linker name
clang -fuse-ld=lld Fails, moaning about invalid linker name despite it being LLVM's linker
clang -fuse-ld=ld Uses GNU ld
clang -fuse-ld=gld Uses GNU ld; not gold
gcc None Uses Sun ld with valid and correct arguments, but that are different from what Clang passes to Sun ld ceteris paribus
gcc -fuse-ld=ld Uses GNU ld with Sun ld arguments (somehow passes)
gcc -fuse-ld=lld Uses lld with Sun ld arguments (explodes)
gcc -fuse-ld=wild Refuses to recognize argument; explodes
gcc -fuse-ld=/abs/path/to/wild/ gcc: error: unrecognized command-line option '-fuse-ld=/home/omnios/.cargo/bin/wild'

@davidlattimore davidlattimore merged commit 4020103 into wild-linker:main Oct 8, 2025
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@daniel-levin daniel-levin deleted the illumos_explainer branch October 9, 2025 09:50
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