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fix(lance-linalg): check fp16kernels feature before arch-specific code #5747

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Merged
wjones127 merged 3 commits into from
Jan 20, 2026
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fix(lance-linalg): check fp16kernels feature before arch-specific code #5747

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a7a6397
fix(lance-linalg): Check fp16kernels feature before arch-specific code
durch Jan 18, 2026
8647a7c
fix: move feature check to else branch per review
durch Jan 18, 2026
49fc9b5
Merge branch 'main' into fix-ios-fp16kernels-build-v1.0.1
durch Jan 19, 2026
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10 changes: 10 additions & 0 deletions rust/lance-linalg/build.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,16 @@ fn main() -> Result<(), String> {
println!("cargo:rerun-if-changed=src/simd/f16.c");
println!("cargo:rerun-if-changed=src/simd/dist_table.c");

// Early exit if fp16kernels feature is not enabled.
// This allows the crate to build on any platform (iOS, Android, etc.)
// when the feature is disabled, without requiring platform-specific kernel support.
//
// Note: We use CARGO_FEATURE_* env var instead of cfg!() because cfg!()
// checks the build script's features, not the library's features.
if env::var("CARGO_FEATURE_FP16KERNELS").is_err() {
return Ok(());
}

// Important: we don't use `cfg!(target_arch)` here because that is the target_arch
// for the build script, not the target_arch for the library. Similar story for
// target_os.
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