04:28 <donpdonp> i have a C to zig question.

04:28 <donpdonp> c code: struct nk_context ctx;

04:29 <donpdonp> zig: var ctx: c.nk_context = <?>

04:29 <donpdonp> the c code allocates ram to hold the nk_context, but im not sure how to state that in zig

04:50 <donpdonp> and in other news, this graphics lib .h is giving zig some trouble. any reference to a struct from the lib throws @compileLog(@sizeOf(c.struct_nk_context)); => analyze.cpp:4302: bool handle_is_ptr(TypeTableEntry*): Assertion `type_entry->data.unionation.complete' failed.

06:28 <donpdonp> more type loopyness.

06:28 <donpdonp> var ret_func = c.glfwGetProcAddress(fname); //?extern fn() void

06:28 <donpdonp> @ptrCast(?&c_void, ret_func); => error: cast discards const qualifier

06:30 <donpdonp> or maybe simpler still, just want to turn a fn() into a voidptr

06:30 <donpdonp> return &c_void(c.glfwGetProcAddress(fname)); error: invalid cast from type '?extern fn() void' to 'c_void'

07:00 <donpdonp> ok I cheated.

07:00 <donpdonp> var ramptr = @ptrToInt(ret_func);

07:00 <donpdonp> var vptr = @intToPtr(?&c_void, ramptr);

07:19 <Hejsil> donpdonp, struct nk_context ctx; == var ctx: c.nk_context = undefined;

07:19 <Hejsil> All functions are const pointers, so you can't cast then to none const pointers

07:20 <Hejsil> @ptrCast(?&const c_void, func) should work

07:21 <Hejsil> This makes sense, as the memory pointed to by a function pointer, probably isn't something you should change :)

07:22 <donpdonp> well one c func returns a fn ptr, the other c func wants a void ptr.

07:22 <donpdonp> casting to const c_void works but breaks what the 2nd function is looking for.

07:23 <Hejsil> Aaah

07:23 <Hejsil> Ye, that's a thing

07:23 <Hejsil> Hmm

07:24 <donpdonp> the ptr->int int->ptr hack seems to be a fine hack for now. :)

07:24 <Hejsil> Well, I think your solution is the best way of discarding const

07:25 <donpdonp> in addition to learning zig's c-interop, im learning that opengl is too low level to put somethingson the screen.

07:26 <Hejsil> Why does the other function take a void ptr and not a fn ptr?

07:26 <Hejsil> Is it some "generic" stuff?

07:31 <donpdonp> not sure why. archaic opengl stuff

07:32 <Hejsil> Hmm, ooh well

08:55 <donpdonp> more ptr fun. this one should be easy for someone :)

08:55 <donpdonp> var argc: c_int = 0;

08:55 <donpdonp> var argv: [][]u8 = [][]u8{};

08:55 <donpdonp> c.gtk_init(&argc, argv.ptr);

08:55 <donpdonp> error: expected type '?&?&?&u8', found '&[]u8'

08:55 <donpdonp> c.gtk_init(&argc, argv.ptr);

08:56 <donpdonp> ^

09:02 <donpdonp> ok well not as zig-ish but this worked

09:02 <donpdonp> var argv: ?&?&u8 = undefined;

09:02 <donpdonp> c.gtk_init(&argc, &argv);

09:12 <Hejsil> donpdonp, you could probably do this: https://pastebin.com/FJcVUCS2

09:50 <donpdonp> is there a way to dump all the symbols in c.*

09:50 <donpdonp> im including #define g_signal_connect(... yet error: no member named 'g_signal_connect' in '(C import)'

09:52 <Hejsil> It might be a macro that Zig wasn't able to translate

09:53 <Hejsil> Zig translates C headers to Zig

09:53 <Hejsil> And macros are tricky

09:53 <donpdonp> nod. thats pretty cool. .h -> .zig

09:54 <donpdonp> well then this road to a gui lib just got longer... (country guitar riff here)

09:54 <Hejsil> You can do 'zig translate-c some-file.c' and it'll print the translated version to stdout

09:55 <donpdonp> it gets stuch on missing paths and a maze of sub-includes

09:57 <Hejsil> Ooh, ye, you probably need the include path with that command

09:57 <Hejsil> I think the flag is -isystem

09:57 <Hejsil> or something

10:04 <donpdonp> is webasm on the roadmap for a zig target?

10:06 <donpdonp> 'WebAssembly has 32-bit and 64-bit architecture variants, called wasm32 and wasm64'

10:07 <donpdonp> ohh i see them now

10:07 <donpdonp> niiice.

10:20 <donpdonp> $ zig build --verbose-cimport 2>&1 |grep -i signal_connect

10:21 <donpdonp> that found the function that the macro expands to, so thats a good lead.

16:19 <andrewrk> donpdonp, if you can come up with a small C test case that would be the first step towards fixing it