conditional fields of constexpr literal structs

Author: youknowone

src/bindgen/language_backend/clike.rs

@@ -912,19 +912,19 @@ impl LanguageBackend for CLikeLanguageBackend<'_> {
                 let ordered_fields = out.bindings().struct_field_names(path);
                 for (i, ordered_key) in ordered_fields.iter().enumerate() {
                     if let Some(lit) = fields.get(ordered_key) {
+                        let condition = lit.cfg.to_condition(self.config);
                         if is_constexpr {
                             out.new_line();
 
+                            condition.write_before(self.config, out);
                             // TODO: Some C++ versions (c++20?) now support designated
                             // initializers, consider generating them.
                             write!(out, "/* .{} = */ ", ordered_key);
                             self.write_literal(out, &lit.value);
                             if i + 1 != ordered_fields.len() {
                                 write!(out, ",");
-                                if !is_constexpr {
-                                    write!(out, " ");
-                                }
                             }
+                            condition.write_after(self.config, out);
                         } else {
                             if i > 0 {
                                 write!(out, ", ");

tests/expectations/cfg.c

@@ -77,6 +77,8 @@ typedef struct {
 #endif
   ;
 } ConditionalField;
+#define ConditionalField_ZERO (ConditionalField){ .field = 0 }
+#define ConditionalField_ONE (ConditionalField){ .field = 1 }
 
 typedef struct {
   int32_t x;

tests/expectations/cfg.compat.c

@@ -95,6 +95,8 @@ typedef struct {
 #endif
   ;
 } ConditionalField;
+#define ConditionalField_ZERO (ConditionalField){ .field = 0 }
+#define ConditionalField_ONE (ConditionalField){ .field = 1 }
 
 typedef struct {
   int32_t x;

tests/expectations/cfg.cpp

@@ -201,6 +201,16 @@ struct ConditionalField {
 #endif
   ;
 };
+constexpr static const ConditionalField ConditionalField_ZERO = ConditionalField{
+#if defined(X11)
+  /* .field = */ 0
+#endif
+};
+constexpr static const ConditionalField ConditionalField_ONE = ConditionalField{
+#if defined(X11)
+  /* .field = */ 1
+#endif
+};
 
 struct Normal {
   int32_t x;

tests/expectations/cfg.pyx

@@ -57,6 +57,8 @@ cdef extern from *:
 
   ctypedef struct ConditionalField:
     int32_t field;
+  const ConditionalField ConditionalField_ZERO # = <ConditionalField>{ 0 }
+  const ConditionalField ConditionalField_ONE # = <ConditionalField>{ 1 }
 
   ctypedef struct Normal:
     int32_t x;

tests/expectations/cfg_both.c

@@ -77,6 +77,8 @@ typedef struct ConditionalField {
 #endif
   ;
 } ConditionalField;
+#define ConditionalField_ZERO (ConditionalField){ .field = 0 }
+#define ConditionalField_ONE (ConditionalField){ .field = 1 }
 
 typedef struct Normal {
   int32_t x;

tests/expectations/cfg_both.compat.c

@@ -95,6 +95,8 @@ typedef struct ConditionalField {
 #endif
   ;
 } ConditionalField;
+#define ConditionalField_ZERO (ConditionalField){ .field = 0 }
+#define ConditionalField_ONE (ConditionalField){ .field = 1 }
 
 typedef struct Normal {
   int32_t x;

tests/expectations/cfg_tag.c

@@ -77,6 +77,8 @@ struct ConditionalField {
 #endif
   ;
 };
+#define ConditionalField_ZERO (ConditionalField){ .field = 0 }
+#define ConditionalField_ONE (ConditionalField){ .field = 1 }
 
 struct Normal {
   int32_t x;

tests/expectations/cfg_tag.compat.c

@@ -95,6 +95,8 @@ struct ConditionalField {
 #endif
   ;
 };
+#define ConditionalField_ZERO (ConditionalField){ .field = 0 }
+#define ConditionalField_ONE (ConditionalField){ .field = 1 }
 
 struct Normal {
   int32_t x;

tests/expectations/cfg_tag.pyx

@@ -57,6 +57,8 @@ cdef extern from *:
 
   cdef struct ConditionalField:
     int32_t field;
+  const ConditionalField ConditionalField_ZERO # = <ConditionalField>{ 0 }
+  const ConditionalField ConditionalField_ONE # = <ConditionalField>{ 1 }
 
   cdef struct Normal:
     int32_t x;

tests/rust/cfg.rs

@@ -49,6 +49,17 @@ struct ConditionalField {
     field: i32,
 }
 
+impl ConditionalField {
+    pub const ZERO: Self = Self {
+        #[cfg(x11)]
+        field: 0,
+    };
+    pub const ONE: Self = Self {
+        #[cfg(x11)]
+        field: 1,
+    };
+}
+
 #[cfg(all(unix, x11))]
 #[no_mangle]
 pub extern "C" fn root(a: FooHandle, c: C)