Add 'compat' feature (#1)

* Add 'compat' feature

* Pass feature to croaring-sys

Author: jaspervdm

Cargo.toml

@@ -9,6 +9,9 @@ readme = "README.md"
 keywords = ["RoaringBitmap", "croaring", "bitmap"]
 documentation = "https://docs.rs/croaring"
 
+[features]
+compat = ["croaring-sys/compat"]
+
 [dev-dependencies]
 proptest = "0.9"
 roaring = "0.5.2"

croaring-sys/Cargo.toml

@@ -9,6 +9,9 @@ documentation = "https://docs.rs/croaring-sys"
 build = "build.rs"
 description = "Raw bindings to CRoaring"
 
+[features]
+compat = []
+
 [dependencies]
 libc = "0.2.42"
 

croaring-sys/build.rs

@@ -5,10 +5,19 @@ use std::env;
 use std::path::PathBuf;
 
 fn main() {
-    cc::Build::new()
+    let mut builder = cc::Build::new();
+    builder
         .flag_if_supported("-std=c11")
-        .flag_if_supported("-march=native")
-        .flag_if_supported("-O3")
+        .flag_if_supported("-O3");
+
+    if cfg!(feature = "compat") {
+        builder.define("DISABLEAVX", Some("1"));
+    }
+    else {
+        builder.flag_if_supported("-march=native");
+    }
+
+    builder
         .file("CRoaring/roaring.c")
         .compile("libroaring.a");