Fix generated constants: f64::INFINITY & f64::NEG_ INFINITY

bindgen/codegen/helpers.rs

@@ -131,6 +131,7 @@ pub(crate) mod ast_ty {
     use crate::ir::function::FunctionSig;
     use crate::ir::layout::Layout;
     use crate::ir::ty::{FloatKind, IntKind};
+    use crate::RustTarget;
     use proc_macro2::TokenStream;
     use std::str::FromStr;
 
@@ -312,23 +313,45 @@ pub(crate) mod ast_ty {
         }
 
         let prefix = ctx.trait_prefix();
+        let rust_target = ctx.options().rust_target;
 
         if f.is_nan() {
-            return Ok(quote! {
-                ::#prefix::f64::NAN
-            });
+            let tokens = if rust_target >= RustTarget::Stable_1_43 {
+                quote! {
+                    f64::NAN
+                }
+            } else {
+                quote! {
+                    ::#prefix::f64::NAN
+                }
+            };
+            return Ok(tokens);
         }
 
         if f.is_infinite() {
-            return Ok(if f.is_sign_positive() {
-                quote! {
-                    ::#prefix::f64::INFINITY
+            let tokens = if f.is_sign_positive() {
+                if rust_target >= RustTarget::Stable_1_43 {
+                    quote! {
+                        f64::INFINITY
+                    }
+                } else {
+                    quote! {
+                        ::#prefix::f64::INFINITY
+                    }
                 }
             } else {
-                quote! {
-                    ::#prefix::f64::NEG_INFINITY
+                // Negative infinity
+                if rust_target >= RustTarget::Stable_1_43 {
+                    quote! {
+                        f64::NEG_INFINITY
+                    }
+                } else {
+                    quote! {
+                        ::#prefix::f64::NEG_INFINITY
+                    }
                 }
-            });
+            };
+            return Ok(tokens);
         }
 
         warn!("Unknown non-finite float number: {:?}", f);

bindgen/features.rs

@@ -106,6 +106,7 @@ define_rust_targets! {
     Stable_1_64(64) => { core_ffi_c: #94503 },
     Stable_1_59(59) => { const_cstr: #54745 },
     Stable_1_47(47) => { larger_arrays: #74060 },
+    Stable_1_43(43) => { associated_constants: #68952 },
     Stable_1_40(40) => { non_exhaustive: #44109 },
     Stable_1_36(36) => { maybe_uninit: #60445 },
     Stable_1_33(33) => { repr_packed_n: #57049 },