#define referencing a struct does not generate bindings

[jgrund]

Consider the following:

#define lov_user_mds_data lov_user_mds_data_v1
struct lov_user_mds_data_v1
{
    int lmd_st;
};

Running:

bindgen wrapper.h -o /tmp/output.rs --whitelist-type lov_user_mds_data

generates an empty bindings file.

I would expect the file to contain the struct lov_user_mds_data_v1 aliased as lov_user_mds_data.

Output from running:

[2019-03-28T17:18:06Z INFO  bindgen] Clang Version: clang version 5.0.1 (tags/RELEASE_501/final)
[2019-03-28T17:18:06Z WARN  bindgen] Using clang (5, 0), expected (3, 9)
[2019-03-28T17:18:06Z DEBUG bindgen] Generating bindings, libclang at /opt/rh/llvm-toolset-7/root/usr/lib64/libclang.so.5.0
[2019-03-28T17:18:06Z DEBUG bindgen] Trying to find clang with flags: []
[2019-03-28T17:18:06Z DEBUG bindgen] Found clang: Clang { path: "/opt/rh/llvm-toolset-7/root/usr/bin/clang", version: Some(CXVersion { Major: 5, Minor: 0, Subminor: 1 }), c_search_paths: Some(["/usr/local/include", "/opt/rh/llvm-toolset-7/root/usr/lib64/clang/5.0.1/include", "/usr/include"]), cpp_search_paths: Some(["/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7", "/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/x86_64-redhat-linux", "/opt/rh/devtoolset-7/root/usr/lib/gcc/x86_64-redhat-linux/7/../../../../include/c++/7/backward", "/usr/local/include", "/opt/rh/llvm-toolset-7/root/usr/lib64/clang/5.0.1/include", "/usr/include"]) }
[2019-03-28T17:18:06Z DEBUG bindgen] Fixed-up options: BindgenOptions { blacklisted_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, blacklisted_functions: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, blacklisted_items: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, opaque_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, rustfmt_path: None, whitelisted_types: RegexSet { items: ["lov_user_mds_data"], matched: [Cell { value: false }], set: Some(RegexSet(["^lov_user_mds_data$"])), record_matches: true }, whitelisted_functions: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, whitelisted_vars: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, default_enum_style: Consts, bitfield_enums: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, rustified_enums: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, constified_enum_modules: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, constified_enums: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, builtins: false, emit_ast: false, emit_ir: false, emit_ir_graphviz: None, enable_cxx_namespaces: false, enable_function_attribute_detection: false, disable_name_namespacing: false, layout_tests: true, impl_debug: false, impl_partialeq: false, derive_copy: true, derive_debug: true, derive_default: false, derive_hash: false, derive_partialord: false, derive_ord: false, derive_partialeq: false, derive_eq: false, use_core: false, ctypes_prefix: None, time_phases: false, namespaced_constants: true, msvc_mangling: false, convert_floats: true, raw_lines: [], module_lines: {}, clang_args: ["-isystem", "/usr/local/include", "-isystem", "/opt/rh/llvm-toolset-7/root/usr/lib64/clang/5.0.1/include", "-isystem", "/usr/include", "/integrated-manager-for-lustre/liblustreapi-sys/wrapper.h"], input_header: Some("/integrated-manager-for-lustre/liblustreapi-sys/wrapper.h"), input_unsaved_files: [], parse_callbacks: None, codegen_config: FUNCTIONS | TYPES | VARS | METHODS | CONSTRUCTORS | DESTRUCTORS, conservative_inline_namespaces: false, generate_comments: true, generate_inline_functions: false, whitelist_recursively: true, objc_extern_crate: false, generate_block: false, block_extern_crate: false, enable_mangling: true, detect_include_paths: true, prepend_enum_name: true, rust_target: Stable_1_33, rust_features: RustFeatures { untagged_union: true, associated_const: true, builtin_clone_impls: true, repr_align: true, i128_and_u128: true, must_use_function: true, repr_transparent: true, repr_packed_n: true, thiscall_abi: false }, record_matches: true, rustfmt_bindings: true, rustfmt_configuration_file: None, no_partialeq_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, no_copy_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, no_hash_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true } }
[2019-03-28T17:18:06Z DEBUG bindgen::ir::item] Item::from_ty_with_id: ItemId(1)
	ty = Type(, kind: Invalid, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None)),
	location = Cursor(lov_user_mds_data kind: macro definition, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:5:9, usr: Some("c:wrapper.h@161@macro@lov_user_mds_data"))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] builtin_or_resolved_ty: Type(, kind: Invalid, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None)), Some(Cursor(lov_user_mds_data kind: macro definition, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:5:9, usr: Some("c:wrapper.h@161@macro@lov_user_mds_data"))), Some(ItemId(0))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] Not resolved, maybe builtin?
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] builtin_or_resolved_ty: Type(, kind: Invalid, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None)), Some(Cursor(lov_user_mds_data kind: macro definition, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:5:9, usr: Some("c:wrapper.h@161@macro@lov_user_mds_data"))), Some(ItemId(0))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] Not resolved, maybe builtin?
[2019-03-28T17:18:06Z DEBUG bindgen::ir::ty] from_clang_ty: ItemId(1), ty: Type(, kind: Invalid, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None)), loc: Cursor(lov_user_mds_data kind: macro definition, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:5:9, usr: Some("c:wrapper.h@161@macro@lov_user_mds_data"))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::ty] currently_parsed_types: []
[2019-03-28T17:18:06Z WARN  bindgen::ir::ty] invalid type Type(, kind: Invalid, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::item] Unhandled cursor kind 501: Cursor(lov_user_mds_data kind: macro definition, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:5:9, usr: Some("c:wrapper.h@161@macro@lov_user_mds_data"))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::item] Item::from_ty_with_id: ItemId(2)
	ty = Type(struct lov_user_mds_data_v1, kind: Record, cconv: 100, decl: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1")), canon: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))),
	location = Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] builtin_or_resolved_ty: Type(struct lov_user_mds_data_v1, kind: Record, cconv: 100, decl: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1")), canon: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))), Some(Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))), Some(ItemId(0))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] Not resolved, maybe builtin?
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] builtin_or_resolved_ty: Type(struct lov_user_mds_data_v1, kind: Record, cconv: 100, decl: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1")), canon: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))), Some(Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))), Some(ItemId(0))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] Not resolved, maybe builtin?
[2019-03-28T17:18:06Z DEBUG bindgen::ir::ty] from_clang_ty: ItemId(2), ty: Type(struct lov_user_mds_data_v1, kind: Record, cconv: 100, decl: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1")), canon: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))), loc: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::ty] currently_parsed_types: [PartialType { decl: Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1")), id: ItemId(2) }]
[2019-03-28T17:18:06Z DEBUG bindgen::ir::comp] CompInfo::from_ty(Struct, Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1")))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::item] from_ty_or_ref_with_id: ItemId(3) Type(int, kind: Int, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None)), Cursor(lmd_st kind: FieldDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:8:9, usr: Some("c:@S@lov_user_mds_data_v1@FI@lmd_st")), Some(ItemId(2))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] builtin_or_resolved_ty: Type(int, kind: Int, cconv: 100, decl: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None), canon: Cursor( kind: NoDeclFound, loc: builtin definitions, usr: None)), Some(Cursor(lmd_st kind: FieldDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:8:9, usr: Some("c:@S@lov_user_mds_data_v1@FI@lmd_st"))), Some(ItemId(2))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] Not resolved, maybe builtin?
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] add_builtin_item: item = Item { id: ItemId(4), local_id: Cell { value: None }, next_child_local_id: Cell { value: 1 }, canonical_name_cache: RefCell { value: None }, comment: None, annotations: Annotations { opaque: false, hide: false, use_instead_of: None, disallow_copy: false, private_fields: None, accessor_kind: None, constify_enum_variant: false, derives: [] }, parent_id: ItemId(0), kind: Type(Type { name: Some("int"), layout: Some(Layout { size: 4, align: 4, packed: false }), kind: Int(Int), is_const: false }) }
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] add_item_to_module: adding ItemId(4) as child of parent module ItemId(0)
[2019-03-28T17:18:06Z DEBUG bindgen::ir::item] TypeId(ItemId(4)) already resolved: Cursor(lmd_st kind: FieldDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:8:9, usr: Some("c:@S@lov_user_mds_data_v1@FI@lmd_st"))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] BindgenContext::add_item(Item { id: ItemId(2), local_id: Cell { value: None }, next_child_local_id: Cell { value: 1 }, canonical_name_cache: RefCell { value: None }, comment: None, annotations: Annotations { opaque: false, hide: false, use_instead_of: None, disallow_copy: false, private_fields: None, accessor_kind: None, constify_enum_variant: false, derives: [] }, parent_id: ItemId(0), kind: Type(Type { name: Some("lov_user_mds_data_v1"), layout: Some(Layout { size: 4, align: 4, packed: false }), kind: Comp(CompInfo { kind: Struct, fields: BeforeComputingBitfieldUnits([RawField(FieldData { name: Some("lmd_st"), ty: TypeId(ItemId(4)), comment: None, annotations: Annotations { opaque: false, hide: false, use_instead_of: None, disallow_copy: false, private_fields: None, accessor_kind: None, constify_enum_variant: false, derives: [] }, bitfield_width: None, mutable: false, offset: Some(0) })]), template_params: [], methods: [], constructors: [], destructor: None, base_members: [], inner_types: [], inner_vars: [], has_own_virtual_method: false, has_destructor: false, has_nonempty_base: false, has_non_type_template_params: false, packed_attr: false, found_unknown_attr: false, is_forward_declaration: false }), is_const: false }) }, declaration: Some(Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1"))), loc: Some(Cursor(lov_user_mds_data_v1 kind: StructDecl, loc: /integrated-manager-for-lustre/liblustreapi-sys/wrapper.h:6:8, usr: Some("c:@S@lov_user_mds_data_v1")))
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] add_item_to_module: adding ItemId(2) as child of parent module ItemId(0)
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] No replacements to process
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] whitelisted_items: testing ""
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] whitelisted_items: testing "lov_user_mds_data_v1"
[2019-03-28T17:18:06Z DEBUG bindgen::ir::context] whitelisted_items: testing "int"
[2019-03-28T17:18:06Z ERROR bindgen::ir::context] unused option: --whitelist-type lov_user_mds_data
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::has_vtable] constrain ItemId(0)
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::template_params] constrain ItemId(0)
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::template_params]   initially, used set is {}
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::template_params]     other item: join with successors' usage
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::template_params]   finally, used set is {}
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::derive] constrain: ItemId(0)
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::derive]     can derive Debug because there are no members
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::derive] inserting ItemId(0) can_derive<Debug>=Yes
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::derive] constrain: ItemId(0)
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::derive]     can derive Copy because there are no members
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::derive] inserting ItemId(0) can_derive<Copy>=Yes
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::has_type_param_in_array] constrain: ItemId(0)
[2019-03-28T17:18:06Z TRACE bindgen::ir::analysis::has_type_param_in_array]     not a type; ignoring
[2019-03-28T17:18:06Z DEBUG bindgen::codegen] codegen: BindgenOptions { blacklisted_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, blacklisted_functions: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, blacklisted_items: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, opaque_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, rustfmt_path: None, whitelisted_types: RegexSet { items: ["lov_user_mds_data"], matched: [Cell { value: false }], set: Some(RegexSet(["^lov_user_mds_data$"])), record_matches: true }, whitelisted_functions: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, whitelisted_vars: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, default_enum_style: Consts, bitfield_enums: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, rustified_enums: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, constified_enum_modules: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, constified_enums: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, builtins: false, emit_ast: false, emit_ir: false, emit_ir_graphviz: None, enable_cxx_namespaces: false, enable_function_attribute_detection: false, disable_name_namespacing: false, layout_tests: true, impl_debug: false, impl_partialeq: false, derive_copy: true, derive_debug: true, derive_default: false, derive_hash: false, derive_partialord: false, derive_ord: false, derive_partialeq: false, derive_eq: false, use_core: false, ctypes_prefix: None, time_phases: false, namespaced_constants: true, msvc_mangling: false, convert_floats: true, raw_lines: [], module_lines: {}, clang_args: ["-isystem", "/usr/local/include", "-isystem", "/opt/rh/llvm-toolset-7/root/usr/lib64/clang/5.0.1/include", "-isystem", "/usr/include", "/integrated-manager-for-lustre/liblustreapi-sys/wrapper.h"], input_header: Some("/integrated-manager-for-lustre/liblustreapi-sys/wrapper.h"), input_unsaved_files: [], parse_callbacks: None, codegen_config: FUNCTIONS | TYPES | VARS | METHODS | CONSTRUCTORS | DESTRUCTORS, conservative_inline_namespaces: false, generate_comments: true, generate_inline_functions: false, whitelist_recursively: true, objc_extern_crate: false, generate_block: false, block_extern_crate: false, enable_mangling: true, detect_include_paths: true, prepend_enum_name: true, rust_target: Stable_1_33, rust_features: RustFeatures { untagged_union: true, associated_const: true, builtin_clone_impls: true, repr_align: true, i128_and_u128: true, must_use_function: true, repr_transparent: true, repr_packed_n: true, thiscall_abi: false }, record_matches: true, rustfmt_bindings: true, rustfmt_configuration_file: None, no_partialeq_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, no_copy_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true }, no_hash_types: RegexSet { items: [], matched: [], set: Some(RegexSet([])), record_matches: true } }
[2019-03-28T17:18:06Z DEBUG bindgen::codegen] <Item as CodeGenerator>::codegen: self = Item { id: ItemId(0), local_id: Cell { value: None }, next_child_local_id: Cell { value: 1 }, canonical_name_cache: RefCell { value: None }, comment: None, annotations: Annotations { opaque: false, hide: false, use_instead_of: None, disallow_copy: false, private_fields: None, accessor_kind: None, constify_enum_variant: false, derives: [] }, parent_id: ItemId(0), kind: Module(Module { name: Some("root"), kind: Normal, children: {ItemId(2), ItemId(4)} }) }
[2019-03-28T17:18:06Z DEBUG bindgen::codegen] <Module as CodeGenerator>::codegen: item = Item { id: ItemId(0), local_id: Cell { value: None }, next_child_local_id: Cell { value: 1 }, canonical_name_cache: RefCell { value: None }, comment: None, annotations: Annotations { opaque: false, hide: false, use_instead_of: None, disallow_copy: false, private_fields: None, accessor_kind: None, constify_enum_variant: false, derives: [] }, parent_id: ItemId(0), kind: Module(Module { name: Some("root"), kind: Normal, children: {ItemId(2), ItemId(4)} }) }

[emilio]

I'm not sure my expectation matches yours, what bindgen does there seems pretty reasonable.

#define is not a reasonable way to alias anything. Bindgen generates the right thing if you use a typedef instead as expected, but #defines in C could literally be anything.

We do a decent-ish job at handling macros that are just constants, but not sure we want to get into the business of trying to guess whether your macro is supposed to be a typedef to a struct or union, an enum variant defined somewhere else, a local variable name, ...

[emilio]

Let's merge this into #258, it seems the same underlying issue.