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(v0.9) Change rustc-abi in custom targets from x86-softfloat to softfloat - #568
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phil-opp
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Jul 6, 2026
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Sorry for the noise. Opened against the wrong base branch at first |
rustc-abi in custom targets from x86-softfloat to softfloat rustc-abi in custom targets from x86-softfloat to softfloat rustc-abi in custom targets from x86-softfloat to softfloatrustc-abi in custom targets from x86-softfloat to softfloatrustc-abi in custom targets from x86-softfloat to softfloatrust-lang/rust#157151 removed the `x86-softfloat` compatibility alias that was introduced in rust-lang/rust#151154. Nightlies from 2026-07-05 onward reject `"rustc-abi": "x86-softfloat"` with: invalid rustc abi: 'x86-softfloat'. allowed values: 'x86-sse2', 'powerpc-spe', 'softfloat' Switch the three custom JSON target specs to the canonical `softfloat` value. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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c510724CompareThe newer nightly (>= 2026-07-05) requires `-Zunstable-options` to load custom JSON target specs. `cargo objcopy` runs an internal `rustc --target x86_64-bootloader.json --print cfg` probe (via rustc-cfg) that doesn't pass the flag and ignores RUSTFLAGS, so it fails to load the target, silently exits 0, and never produces `bootloader.bin` -- causing the later QEMU step to fail with "No such file or directory". `rust-objcopy` is the same tool from cargo-binutils but skips the target probe (we pass explicit ELF input/output paths), so it works without the flag. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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phil-opp
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Jul 7, 2026
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Published as v0.9.35 |
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The Rust PR rust-lang/rust#157151 removed the
x86-softfloatcompatibility alias. Nightlies from2026-07-05 onward reject
"rustc-abi": "x86-softfloat"with:Switch the three custom JSON target specs to the canonical
softfloatvalue.Created with Claude Code