1 files changed, 29 insertions, 0 deletions
diff --git a/third_party/rust/num-traits/build.rs b/third_party/rust/num-traits/build.rs
new file mode 100644
index 0000000000..c7bf364f1c
--- /dev/null
+++ b/third_party/rust/num-traits/build.rs
@@ -0,0 +1,29 @@
+extern crate autocfg;
+
+use std::env;
+
+fn main() {
+    let ac = autocfg::new();
+
+    // If the "i128" feature is explicity requested, don't bother probing for it.
+    // It will still cause a build error if that was set improperly.
+    if env::var_os("CARGO_FEATURE_I128").is_some() || ac.probe_type("i128") {
+        autocfg::emit("has_i128");
+    }
+
+    ac.emit_expression_cfg(
+        "unsafe { 1f64.to_int_unchecked::<i32>() }",
+        "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");
+}