mirror of
https://github.com/BLAKE3-team/BLAKE3
synced 2024-06-08 03:56:06 +02:00
9bf1020213
This lets us enable it by default in b3sum.
92 lines
2.9 KiB
Rust
92 lines
2.9 KiB
Rust
use std::env;
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fn defined(var: &str) -> bool {
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env::var_os(var).is_some()
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}
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fn target_arch() -> String {
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let target = env::var("TARGET").unwrap();
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let target_components: Vec<&str> = target.split("-").collect();
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target_components[0].to_string()
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}
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fn target_os() -> String {
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let target = env::var("TARGET").unwrap();
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let target_components: Vec<&str> = target.split("-").collect();
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target_components[2].to_string()
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}
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fn is_windows() -> bool {
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target_os() == "windows"
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}
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fn is_x86_64() -> bool {
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target_arch() == "x86_64"
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}
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fn is_armv7() -> bool {
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target_arch() == "armv7"
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}
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fn new_build() -> cc::Build {
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let mut build = cc::Build::new();
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if !is_windows() {
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build.flag("-std=c11");
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}
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build
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}
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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// "c_avx512' is a no-op for non-x86_64 targets. It also participates in
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// dynamic CPU feature detection, so it's generally safe to enable.
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// However, it probably won't build in some older environments without
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// AVX-512 support in the C compiler, and it's disabled by default for that
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// reason.
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if defined("CARGO_FEATURE_C_AVX512") && is_x86_64() {
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let mut build = new_build();
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build.file("src/c/blake3_avx512.c");
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if is_windows() {
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// Note that a lot of versions of MSVC don't support /arch:AVX512,
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// and they'll discard it with a warning, hopefully leading to a
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// build error.
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build.flag("/arch:AVX512");
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} else {
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build.flag("-mavx512f");
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build.flag("-mavx512vl");
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}
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build.compile("blake3_avx512");
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}
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if defined("CARGO_FEATURE_C_NEON") {
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let mut build = new_build();
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// Note that blake3_neon.c normally depends on the blake3_portable.c
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// for the single-instance compression function, but we expose
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// portable.rs over FFI instead. See c_neon.rs.
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build.file("src/c/blake3_neon.c");
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// ARMv7 platforms that support NEON generally need the following
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// flags. AArch64 supports NEON by default and does not support -mpfu.
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if is_armv7() {
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build.flag("-mfpu=neon-vfpv4");
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build.flag("-mfloat-abi=hard");
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}
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build.compile("blake3_neon");
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}
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// The `cc` crate does not automatically emit rerun-if directives for the
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// environment variables it supports, in particular for $CC. We expect to
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// do a lot of benchmarking across different compilers, so we explicitly
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// add the variables that we're likely to need.
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println!("cargo:rerun-if-env-changed=CC");
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println!("cargo:rerun-if-env-changed=CFLAGS");
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// Ditto for source files, though these shouldn't change as often.
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for file in std::fs::read_dir("src/c")? {
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println!(
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"cargo:rerun-if-changed={}",
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file?.path().to_str().expect("utf-8")
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);
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}
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Ok(())
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}
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