1 files changed, 9 insertions, 0 deletions
diff --git a/build.rs b/build.rs
index 816ddad..c7bf364 100644
--- a/build.rs
+++ b/build.rs
@@ -16,5 +16,14 @@ fn main() {
         "has_to_int_unchecked",
     );
 
+    ac.emit_expression_cfg("1u32.reverse_bits()", "has_reverse_bits");
+    ac.emit_expression_cfg("1u32.trailing_ones()", "has_leading_trailing_ones");
+    ac.emit_expression_cfg("{ let mut x = 1; x += &2; }", "has_int_assignop_ref");
+    ac.emit_expression_cfg("1u32.div_euclid(1u32)", "has_div_euclid");
+
+    if env::var_os("CARGO_FEATURE_STD").is_some() {
+        ac.emit_expression_cfg("1f64.copysign(-1f64)", "has_copysign");
+    }
+
     autocfg::rerun_path("build.rs");
 }