add sse feature (#28)

Cargo.toml

@@ -19,6 +19,7 @@ default = []
 valgrind = []
 static-link = ["librocksdb_sys/static-link"]
 portable = ["librocksdb_sys/portable"]
+sse = ["librocksdb_sys/sse"]
 
 [[test]]
 

librocksdb_sys/Cargo.toml

@@ -14,6 +14,7 @@ static-link = []
 # portable doesn't require static link, though it's meaningless
 # when not using with static-link right now in this crate.
 portable = []
+sse = []
 
 [build-dependencies]
 gcc = "0.3"

librocksdb_sys/build.rs

@@ -64,6 +64,10 @@ fn main() {
                 if cfg!(feature = "portable") {
                     cmd.env("PORTABLE", "1");
                 }
+
+                if cfg!(feature = "sse") {
+                    cmd.env("USE_SSE", "1");
+                }
             }
             run(&mut cmd);
         }