restricted c header imports

examples/interop/header/include/child.h

@@ -0,0 +1,6 @@
+#ifndef BROLANG_CHILD_H
+#define BROLANG_CHILD_H
+
+int child_value(int value);
+
+#endif

examples/interop/header/include/native.h

@@ -0,0 +1,40 @@
+#ifndef BROLANG_NATIVE_H
+#define BROLANG_NATIVE_H
+
+#include <child.h>
+
+typedef int imported_int;
+typedef imported_int imported_int_alias;
+typedef struct Imported_Handle Imported_Handle;
+typedef void (*Imported_Callback)(int value);
+typedef struct Imported_Value {
+	int value;
+} Imported_Value;
+typedef union Imported_Union {
+	int value;
+} Imported_Union;
+typedef enum Imported_Enum {
+	IMPORTED_ENUM_VALUE,
+} Imported_Enum;
+
+int imported_add(imported_int_alias left, int right);
+unsigned long imported_scalar(unsigned char value, unsigned long extra);
+Imported_Handle *imported_handle(void);
+int imported_read(const Imported_Handle *handle);
+Imported_Value imported_by_value(Imported_Value value);
+int imported_volatile(volatile int *value);
+_Bool imported_bool(_Bool value);
+extern int imported_global;
+
+static inline int imported_inline(int value) {
+	return value;
+}
+
+#ifdef BROLANG_FEATURE
+int configured_value(int value);
+#endif
+
+#define IMPORTED_MACRO 42
+int imported_variadic(const char *format, ...);
+
+#endif