Permit IntKind::Custom to represent Paths instead of just Idents (#1800)

Author: emilio

bindgen-integration/build.rs

@@ -1,7 +1,7 @@
 extern crate bindgen;
 extern crate cc;
 
-use bindgen::callbacks::{MacroParsingBehavior, ParseCallbacks};
+use bindgen::callbacks::{MacroParsingBehavior, ParseCallbacks, IntKind};
 use bindgen::Builder;
 use std::collections::HashSet;
 use std::env;
@@ -59,6 +59,17 @@ impl ParseCallbacks for MacroCallback {
             _ => {}
         }
     }
+
+    fn int_macro(&self, name: &str, _value: i64) -> Option<IntKind> {
+        match name {
+            "TESTMACRO_CUSTOMINTKIND_PATH" => Some(IntKind::Custom {
+                name: "crate::MacroInteger",
+                is_signed: true,
+            }),
+
+            _ => None,
+        }
+    }
 }
 
 impl Drop for MacroCallback {

bindgen-integration/cpp/Test.h

@@ -5,6 +5,7 @@
 #define TESTMACRO_INTEGER 42
 #define TESTMACRO_STRING "Hello Preprocessor!"
 #define TESTMACRO_STRING_EXPANDED TESTMACRO_STRING
+#define TESTMACRO_CUSTOMINTKIND_PATH 123
 
 #include <cwchar>
 

bindgen-integration/src/lib.rs

@@ -11,6 +11,8 @@ use std::os::raw::c_int;
 #[allow(unused)]
 use bindings::testing::Bar; // This type is generated from module_raw_line.
 
+type MacroInteger = isize;
+
 #[test]
 fn test_static_array() {
     let mut test = unsafe { bindings::Test_COUNTDOWN.as_ptr() };
@@ -242,3 +244,9 @@ fn test_item_rename() {
         member: bindings::bar { foo: 2 },
     };
 }
+
+#[test]
+fn test_macro_customintkind_path() {
+    let v: &std::any::Any = &bindings::TESTMACRO_CUSTOMINTKIND_PATH;
+    assert!(v.is::<MacroInteger>())
+}

src/codegen/mod.rs

@@ -3328,10 +3328,7 @@ impl TryToRustTy for Type {
                     IntKind::I64 => Ok(quote! { i64 }),
                     IntKind::U64 => Ok(quote! { u64 }),
                     IntKind::Custom { name, .. } => {
-                        let ident = ctx.rust_ident_raw(name);
-                        Ok(quote! {
-                            #ident
-                        })
+                        Ok(proc_macro2::TokenStream::from_str(name).unwrap())
                     }
                     IntKind::U128 => {
                         Ok(if ctx.options().rust_features.i128_and_u128 {