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6d1033e7fc
Introduce a Cargo feature to enable or disable architecture-specific features (SIMD, assembly), which is on by default. This allows for more fine grained control compared to relying on the `force-soft-floats` feature. Similar to "unstable-intrinsics", introduce a build.rs config option for `unstable-intrinsics AND NOT force-soft-floats`, which makes this easier to work with in code. Effectively, this allows moving our non-additive Cargo feature (force-soft-floats) to a positive one by default, allowing for an override when needed.
43 lines
1.3 KiB
Rust
43 lines
1.3 KiB
Rust
use std::env;
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fn main() {
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println!("cargo:rerun-if-changed=build.rs");
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println!("cargo:rustc-check-cfg=cfg(assert_no_panic)");
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println!("cargo:rustc-check-cfg=cfg(feature, values(\"checked\"))");
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#[allow(unexpected_cfgs)]
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if !cfg!(feature = "checked") {
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let lvl = env::var("OPT_LEVEL").unwrap();
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if lvl != "0" {
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println!("cargo:rustc-cfg=assert_no_panic");
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}
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}
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configure_intrinsics();
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configure_arch();
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}
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/// Simplify the feature logic for enabling intrinsics so code only needs to use
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/// `cfg(intrinsics_enabled)`.
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fn configure_intrinsics() {
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println!("cargo:rustc-check-cfg=cfg(intrinsics_enabled)");
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// Disabled by default; `unstable-intrinsics` enables again; `force-soft-floats` overrides
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// to disable.
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if cfg!(feature = "unstable-intrinsics") && !cfg!(feature = "force-soft-floats") {
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println!("cargo:rustc-cfg=intrinsics_enabled");
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}
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}
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/// Simplify the feature logic for enabling arch-specific features so code only needs to use
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/// `cfg(arch_enabled)`.
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fn configure_arch() {
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println!("cargo:rustc-check-cfg=cfg(arch_enabled)");
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// Enabled by default via the "arch" feature, `force-soft-floats` overrides to disable.
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if cfg!(feature = "arch") && !cfg!(feature = "force-soft-floats") {
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println!("cargo:rustc-cfg=arch_enabled");
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}
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}
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