feat: add no_opt_arch feature flag (#13)

- Close #12

Author: Brooooooklyn

Cargo.toml

@@ -30,6 +30,7 @@ secure = ["libmimalloc-sys2/secure"]
 override = ["libmimalloc-sys2/override"]
 local_dynamic_tls = ["libmimalloc-sys2/local_dynamic_tls"]
 no_thp = ["libmimalloc-sys2/no_thp"]
+no_opt_arch = ["libmimalloc-sys2/no_opt_arch"]
 extended = ["libmimalloc-sys2/extended"]
 skip_collect_on_exit = ["libmimalloc-sys2/skip_collect_on_exit"]
 

libmimalloc-sys/Cargo.toml

@@ -35,6 +35,8 @@ arena = []
 local_dynamic_tls = []
 no_thp = []
 skip_collect_on_exit = []
+# turn off `MI_OPT_ARCH`, default is `ON`
+no_opt_arch = []
 
 # Show `extended` on docs.rs since it's the full API surface.
 [package.metadata.docs.rs]

libmimalloc-sys/build.rs

@@ -38,6 +38,10 @@ fn main() {
         cmake_config.define("MI_TRACK_ETW", "ON");
     }
 
+    if env::var_os("CARGO_FEATURE_NO_OPT_ARCH").is_some() {
+        cmake_config.define("MI_OPT_ARCH", "OFF");
+    }
+
     // it's complicated to link ucrt in debug mode on windows
     if profile == "debug" && target_env != "msvc" {
         cmake_config