cimport.zig: use of undeclared identifier

[enedil]

I have such zig source file (build file is the stock one, and just adds include path and links C library).

// header.h contents:
//
// typedef int X;
// X make_x(void);

const h = @cImport({
    @cInclude("header.h");
});

pub fn f() @TypeOf(h.make_x()) {
    return h.make_x();
}

pub fn main() anyerror!void {
    _ = f();
}

This results in such an error:

~/l/zigpoc [1] $ zig build --verbose-cimport
info(compilation): C import output: /home/enedil/lol/zigpoc/zig-cache/o/735ed48abfd528be8b8d13c9b28b47c8/cimport.zig
./zig-cache/o/735ed48abfd528be8b8d13c9b28b47c8/cimport.zig:3:24: error: use of undeclared identifier 'X'
pub extern fn make_x() X;
                       ^
./zig-cache/o/735ed48abfd528be8b8d13c9b28b47c8/cimport.zig:3:24: note: called from here
pub extern fn make_x() X;
                       ^
./src/main.zig:10:12: note: called from here
pub fn f() @TypeOf(h.make_x()) {
           ^
./src/main.zig:10:28: note: referenced here
pub fn f() @TypeOf(h.make_x()) {
                           ^
./src/main.zig:15:9: note: referenced here
    _ = f();
        ^

The initial lines of this cached translated C file are:

pub usingnamespace @import("std").c.builtins;
pub const X = c_int;
pub extern fn make_x() X;

It looks like X is actually defined before.

This issue doesn't appear if not using h.make_x() inside @TypeOf.

OS: Fedora 34
Zig version: 0.8.0, as shipped with Fedora.

[Vexu]

The issue is not related to translate-c and can be reproduced with just plain imports:

// a.zig
const h = @import("b.zig");
comptime { @TypeOf(h.make_x()); }
// b.zig
pub const X = c_int;
pub extern fn make_x() X;

[bernardassan]

I am having a similar issue with using glfw with zig cImport. error: use of undeclared identifier 'GLFWwindow'. It compiles on zig 0.8.1 but not on 0.9.0-dev.1903+2af94e76a