cgen: invalid autogenerated eq functions

[dy-tea]

Been having this issue in my project where uncompilable eq functions are being generated causing a failed compilation. Didn't open as a bug because I'm not sure if it's a bug or my fault (I haven't been able to reproduce with a smaller example).

Output snippet:

/tmp/v_1000/compositor.01JHKCE915BY6K8ESGDNF49457.tmp.c: In function ‘wlr_surface_state_struct_eq’:
/tmp/v_1000/compositor.01JHKCE915BY6K8ESGDNF49457.tmp.c:4400:56: error: incompatible type for argument 1 of ‘src__wlr___VAnonStruct18_struct_eq’
 4400 |                 && src__wlr___VAnonStruct18_struct_eq(a.viewport, b.viewport)
      |                                                       ~^~~~~~~~~
      |                                                        |
      |                                                        struct <anonymous>

My code can be found here, if anyone is interested in diagnosing the problem you can have a look. If this issue is invalid feel free to close it.

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[huly-for-github]

Connected to Huly®: V_0.6-21902

[felipensp]

I'm getting builder error: Header file "wlr/util/addon.h", needed for module src.wlr was not found. Please install the corresponding development headers. when trying to build it.

[dy-tea]

Interesting, are you using the incorrect version of wlroots by any chance? My project builds against 0.19 but I haven't made it clear in the README so you might be using 0.18

[felipensp]

This is because you are referencing the C anonymous struct type that is not same type than V created to represent it. To make it working we should cast it.

[felipensp]

struct Foo {
    struct {
        int b;
    } a;
};

#include "@VROOT/foo.h"

struct C.Foo {
	a struct {
		b int
	}
}

fn main() {
	a := C.Foo{}
	b := C.Foo{}
	assert a == b
}

inline bool main___VAnonStruct1_struct_eq(main___VAnonStruct1 a, main___VAnonStruct1 b) {
	return a.b == b.b;
}

inline bool Foo_struct_eq(struct Foo a, struct Foo b) {
	return main___VAnonStruct1_struct_eq(a.a, b.a);
}

Foo.a is not main___VAnonStruct1. But it could be casted to it.