> If an application uses two libraries, each of which handles lists of int, each library will have to independently macro-generate its separate list implementation, and because C's type system is nominal, the generated types will be isomorphic but incompatible.
Um, what? C89, 3.1.2.6: "Moreover, two structure, union, or enumeration types declared in separate translation units are compatible if they have the same number of members, the same member names, and compatible member types; for two structures, the members shall be in the same order".
There has been some minor changes over the years, but as long as the struct tags are the same, and the fields are in the same order and have compatible types, the two structs defined in separate compilation units are compatible.
Um, what? C89, 3.1.2.6: "Moreover, two structure, union, or enumeration types declared in separate translation units are compatible if they have the same number of members, the same member names, and compatible member types; for two structures, the members shall be in the same order".
There has been some minor changes over the years, but as long as the struct tags are the same, and the fields are in the same order and have compatible types, the two structs defined in separate compilation units are compatible.