Use compile_error macro to replace build script

.github/workflows/bench.yml

@@ -33,7 +33,7 @@ jobs:
       run: rustup default nightly
 
     - name: Benchmark
-      run: cargo bench --bench throughput --features bench-plot
+      run: cargo bench --bench throughput --features bench-plot hybrid
 
     - uses: actions/upload-artifact@v3
       with:

.github/workflows/build_test.yml

@@ -40,10 +40,10 @@ jobs:
       run: cargo rustc -- --version
 
     - name: Build
-      run: cargo build --release
+      run: cargo build --release --features hybrid
 
     - name: Test
-      run: cargo test --release --lib
+      run: cargo test --release --lib --features hybrid
 
   build_test_arm:
     name: Build & Test ARM

Cargo.toml

@@ -17,6 +17,7 @@ exclude = ["article/*"]
 bench-csv = []
 bench-md = []
 bench-plot = []
+hybrid = []
 
 [dependencies]
 rand = "0.8"

build.rs

@@ -2,18 +2,5 @@ extern crate rustc_version;
 use rustc_version::{version_meta, Channel};
 
 fn main() {
-    // When conditions permits, enable hybrid feature to leverage wider intrinsics for even more throughput
-    if version_meta().unwrap().channel == Channel::Nightly
-    && cfg!(target_arch = "x86_64")
-    && cfg!(target_feature = "avx2")
-    && cfg!(target_feature = "vaes") {
-        println!("cargo:rustc-cfg=hybrid");
-    }
 
-    // If not cross compiling, make sure the aes feature is available
-    if std::env::var("HOST").unwrap_or_default() == std::env::var("TARGET").unwrap_or_default()
-    && cfg!(not(target_feature = "aes")) {
-        panic!("| GxHash requires target-feature 'aes' to be enabled.\n\
-        | Build with RUSTFLAGS=\"-C target-cpu=native\" or RUSTFLAGS=\"-C target-feature=+aes\" to enable.");
-    }
 }

src/lib.rs

@@ -1,6 +1,12 @@
 // Hybrid SIMD width usage currently requires unstable 'stdsimd'
 #![cfg_attr(hybrid, feature(stdarch_x86_avx512))]
 
+#[cfg(all(feature = "hybrid", not(any(target_arch = "x86_64", target_feature = "avx2", target_feature = "vaes"))))]
+compile_error!{"Hybrid feature is only available on x86 processors with avx2 and vaes intrinsics."}
+
+#[cfg(not(target_feature = "aes"))]
+compile_error!{"Gxhash requires aes intrinsics. Make sure the processor supports it and build with RUSTFLAGS=\"-C target-cpu=native\" or RUSTFLAGS=\"-C target-feature=+aes\"."}
+
 #[rustfmt::skip]
 mod gxhash;
 mod hasher;