Only enable simd on targets which feature SSE

BurntSushi · Oct 27, 2020 · 40052ce · 40052ce
1 parent 10f11fb
commit 40052ce
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/build.rs b/build.rs
@@ -10,7 +10,11 @@ fn main() {
 // This can be disabled with RUSTFLAGS="--cfg memchr_disable_auto_simd", but
 // this is generally only intended for testing.
 fn enable_simd_optimizations() {
-    if is_env_set("CARGO_CFG_MEMCHR_DISABLE_AUTO_SIMD") {
+    if is_env_set("CARGO_CFG_MEMCHR_DISABLE_AUTO_SIMD")
+        || !env::var("CARGO_CFG_TARGET_FEATURE")
+            .map(|features| features.contains("sse"))
+            .unwrap_or(false)
+    {
         return;
     }
     println!("cargo:rustc-cfg=memchr_runtime_simd");