ir: Properly skip inline namespaces when building names.

Fixes rust-lang#789

Author: emilio

src/ir/item.rs

@@ -768,9 +768,19 @@ impl Item {
             .ancestors(ctx)
             .filter(|id| *id != ctx.root_module())
             .take_while(|id| {
-                // Stop iterating ancestors once we reach a namespace.
+                // Stop iterating ancestors once we reach a non-inline namespace
+                // when opt.within_namespaces is set.
                 !opt.within_namespaces || !ctx.resolve_item(*id).is_module()
             })
+            .filter(|id| {
+                if !ctx.options().conservative_inline_namespaces {
+                    if let ItemKind::Module(ref module) = *ctx.resolve_item(*id).kind() {
+                        return !module.is_inline();
+                    }
+                }
+
+                true
+            })
             .map(|id| {
                 let item = ctx.resolve_item(id);
                 let target = ctx.resolve_item(item.name_target(ctx));

tests/expectations/tests/inline_namespace_no_ns_enabled.rs

@@ -0,0 +1,34 @@
+/* automatically generated by rust-bindgen */
+
+
+#![allow(dead_code, non_snake_case, non_camel_case_types, non_upper_case_globals)]
+
+
+#[repr(C)]
+#[derive(Debug)]
+pub struct std_basic_string<CharT> {
+    pub hider: std_basic_string_Alloc_hider,
+    pub length: ::std::os::raw::c_ulong,
+    pub __bindgen_anon_1: std_basic_string__bindgen_ty_1<CharT>,
+    pub _phantom_0: ::std::marker::PhantomData<::std::cell::UnsafeCell<CharT>>,
+}
+#[repr(C)]
+#[derive(Debug, Copy, Clone)]
+pub struct std_basic_string_Alloc_hider {
+    pub storage: *mut ::std::os::raw::c_void,
+}
+impl Default for std_basic_string_Alloc_hider {
+    fn default() -> Self { unsafe { ::std::mem::zeroed() } }
+}
+#[repr(C)]
+#[derive(Debug)]
+pub struct std_basic_string__bindgen_ty_1<CharT> {
+    pub inline_storage: [CharT; 4usize],
+    pub _phantom_0: ::std::marker::PhantomData<::std::cell::UnsafeCell<CharT>>,
+}
+impl <CharT> Default for std_basic_string__bindgen_ty_1<CharT> {
+    fn default() -> Self { unsafe { ::std::mem::zeroed() } }
+}
+impl <CharT> Default for std_basic_string<CharT> {
+    fn default() -> Self { unsafe { ::std::mem::zeroed() } }
+}

tests/headers/inline_namespace_no_ns_enabled.hpp

@@ -0,0 +1,18 @@
+// bindgen-flags: -- -std=c++11
+
+namespace std {
+inline namespace __cxx11 {
+
+template<typename CharT>
+class basic_string {
+  struct Alloc_hider {
+    void* storage;
+  } hider;
+  unsigned long length;
+  struct {
+    CharT inline_storage[4];
+  };
+};
+
+}
+}