error: "epoxy/gl.h" file not found | Zig Programming Language | Page 1

uneven nebula Apr 5, 2023, 1:09 AM

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Hey. I'm using Manjaro Linux.

In my build.zig I have the following:

    exe.linkLibC();
    exe.linkSystemLibrary("m");
    exe.linkSystemLibrary("glfw");
    exe.linkSystemLibrary("epoxy");
    exe.linkSystemLibrary("z");

And in some part of my code I have a @cImport like so:

pub usingnamespace @cImport({
    @cInclude("stdio.h");
    @cInclude("math.h");
    @cInclude("time.h");
    @cInclude("epoxy/gl.h");
    @cInclude("GLFW/glfw3.h");
});

When I try to build it, it's telling me that it can't find either glfw or epoxy, which is strange, considering I have both installed.

It's also saying another thing:

/usr/lib/zig/lib/std/os.zig:148:24: error: root struct of file 'c' has no member named 'fd_t'
pub const fd_t = system.fd_t;
                 ~~~~~~^~~~~

Am I doing something wrong?

I'm using zig 0.11.0-dev.2358+43a6384e9

wraith dragon Apr 5, 2023, 1:11 AM

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@uneven nebula Does linking C source with them work?

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the fd_t is weird and I have no clue

uneven nebula Apr 5, 2023, 1:11 AM

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linking C source with them?

wraith dragon Apr 5, 2023, 1:12 AM

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epoxy and GLFW

uneven nebula Apr 5, 2023, 1:12 AM

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how would I go ahead and test that?

wraith dragon Apr 5, 2023, 1:12 AM

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oh wait this is about includes

uneven nebula Apr 5, 2023, 1:12 AM

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yeah

wraith dragon Apr 5, 2023, 1:12 AM

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no clue sorry

uneven nebula Apr 5, 2023, 1:12 AM

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no problem

wraith dragon Apr 5, 2023, 1:12 AM

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uneven nebula how would I go ahead and test that?

cc file.c -lepoxy -lglfw

sage gust Apr 5, 2023, 1:12 AM

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the cIncludes translate to #include <file.h> so you'd need to provide exe.addIncludePath("/path/to/those"); (if they aren't in a standard location?)

wraith dragon Apr 5, 2023, 1:13 AM

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I think they might just not have development packages?

sage gust Apr 5, 2023, 1:13 AM

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possible

uneven nebula Apr 5, 2023, 1:13 AM

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sage gust the cIncludes translate to `#include <file.h>` so you'd need to provide `exe.add...

well yes but

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am I not including them already in the build.zig?

uneven nebula Apr 5, 2023, 1:14 AM

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wraith dragon I think they might just not have development packages?

damn

wraith dragon Apr 5, 2023, 1:14 AM

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uneven nebula damn

try compiling this:

#include <epoxy/gl.h>

int main(void) {
    epoxy_gl_version();
}

put it in file.c then
cc file.c -lepoxy

uneven nebula Apr 5, 2023, 1:14 AM

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one sec

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it worked

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it isn't returning anything when running

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but that is to be expected

wraith dragon Apr 5, 2023, 1:16 AM

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yeah, so this is a Zig thing

sharp oyster Apr 5, 2023, 1:16 AM

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linkSystemLibrary asks the linker to link with binaries that are in the system path. It does not add those paths to find C headers that are used by @cImport.

wraith dragon Apr 5, 2023, 1:16 AM

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no idea then, sorry

sharp oyster Apr 5, 2023, 1:16 AM

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You need addIncludePath to do that.

uneven nebula Apr 5, 2023, 1:16 AM

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sharp oyster You need `addIncludePath` to do that.

oh

wraith dragon Apr 5, 2023, 1:17 AM

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sharp oyster You need `addIncludePath` to do that.

but, apparently, the headers are in standard locations, since cc finds them

uneven nebula Apr 5, 2023, 1:17 AM

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so what would I give as parameters for the addIncludePath?

sharp oyster Apr 5, 2023, 1:17 AM

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wraith dragon but, apparently, the headers are in standard locations, since cc finds them

Linking with a system library doesn't need you to use the C headers in any way.

sharp oyster Apr 5, 2023, 1:17 AM

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uneven nebula so what would I give as parameters for the addIncludePath?

The path where the headers you are importing can be found.

wraith dragon Apr 5, 2023, 1:17 AM

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sharp oyster Linking with a system library doesn't need you to use the C headers in any way.

that's correct -- but they have the headers

uneven nebula Apr 5, 2023, 1:17 AM

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sharp oyster The path where the headers you are importing can be found.

i see I see

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probably /bin somewhere

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let me see

sharp oyster Apr 5, 2023, 1:17 AM

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wraith dragon that's correct -- but they have the headers

Irrelevant unless they add those include paths to the build.zig. 😛

wraith dragon Apr 5, 2023, 1:18 AM

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uneven nebula probably /bin somewhere

should be in /usr/include or /usr/local/include

wraith dragon Apr 5, 2023, 1:18 AM

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sharp oyster Irrelevant unless they add those include paths to the build.zig. 😛

Sorry?

uneven nebula Apr 5, 2023, 1:18 AM

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wraith dragon should be in /usr/include or /usr/local/include

probably

wraith dragon Apr 5, 2023, 1:18 AM

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Does Zig not use the system include paths?

uneven nebula Apr 5, 2023, 1:18 AM

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found epoxy in /usr/include

sharp oyster Apr 5, 2023, 1:19 AM

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wraith dragon Does Zig not use the system include paths?

Zig wants to be portable; using the system for anything isn't portable.
But also, again, you don't need the C headers in order to call into and use a compiled C library; only to use cImport.

wraith dragon Apr 5, 2023, 1:19 AM

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uneven nebula found epoxy in /usr/include

then try addIncludePath("/usr/include")

uneven nebula Apr 5, 2023, 1:19 AM

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das what I did

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I'll try building

sharp oyster Apr 5, 2023, 1:19 AM

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Nothing is added to the build unless you explicitly say so, to be clear.

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C include paths included.

uneven nebula Apr 5, 2023, 1:20 AM

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glfw3 not found

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this is on my end

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gimme a sec

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there

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GLFW/glfw3.h should be it

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okay it worked, now I have other bugs, but it's ok

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at least this one was solved

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thanks guys

sharp oyster Apr 5, 2023, 1:20 AM

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Welcome o7 😄

sage gust Apr 5, 2023, 1:21 AM

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🎆

wraith dragon Apr 5, 2023, 1:21 AM

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sharp oyster Nothing is added to the build unless you explicitly say so, to be clear.

using pkg-config to automagically give pkg-config --cflags when given -l or hardcoding include paths doesn't seem very explicit or portable to me...

sharp oyster Apr 5, 2023, 1:23 AM

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wraith dragon using pkg-config to automagically give `pkg-config --cflags` when given `-l` or ...

I would probably prefer vendoring deps myself for this reason.
They prefer to think that package managers are supposed to follow semver, and that if they don't, they should fix it; "upstream issue," basically.

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Or so is my general impression, at least.

uneven nebula Apr 5, 2023, 1:25 AM

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now uh

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I only hav eone last problem

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pub const fd_t = system.fd_t;"```

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this I have no idea about

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should I simply try to update zig and hope it goes away?

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updated, same error though

wraith dragon Apr 5, 2023, 1:27 AM

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sharp oyster I would probably prefer vendoring deps myself for this reason. They prefer to th...

by "vendoring", you mean distributing them alongside the source code of your program?

They prefer to think that package managers are supposed to follow semver, and that if they don't, they should fix it; "upstream issue," basically
I have no idea how this is related?

sharp oyster Apr 5, 2023, 1:28 AM

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wraith dragon by "vendoring", you mean distributing them alongside the source code of your pro...

By vendoring, I do mean that yeah.

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Or rather

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More precisely

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Including their source in your project source.

wraith dragon Apr 5, 2023, 1:28 AM

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sounds like it'd bloat your distribution quite a bit omw to ship GTK and all its dependencies with my source

sharp oyster Apr 5, 2023, 1:29 AM

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This is one of the reasons why I would likely never use GTK if I can at all avoid it 🤣
I want to be able to maintain my code, and be able to address things easily, etc; all of which is affected by this.

wraith dragon Apr 5, 2023, 1:29 AM

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uneven nebula ```"/usr/lib/zig/lib/std/os.zig:148:24: error: root struct of file 'c' has no me...

I have no idea, where is that coming from?

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where is os used?

uneven nebula Apr 5, 2023, 1:31 AM

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nowhere

wraith dragon Apr 5, 2023, 1:31 AM

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thonk

uneven nebula Apr 5, 2023, 1:31 AM

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it's not telling me

sage gust Apr 5, 2023, 1:32 AM

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is there more to it? what with -freference-trace?

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its wasi

uneven nebula Apr 5, 2023, 1:32 AM

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the only time I even came close to mentioning os stuff is when I did the target thing, told it was wasm32 and freestanding

wraith dragon Apr 5, 2023, 1:32 AM

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sharp oyster This is one of the reasons why I would likely never use GTK if I can at all avoi...

This applies to many system libraries which are generally packaged by the system and are designed to be used as such. The point is that this will bloat your distribution and re-ship many libraries...

uneven nebula Apr 5, 2023, 1:32 AM

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sage gust is there more to it? what with `-freference-trace`?

oh

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it told me now

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" onInit: src/quad-part.zig:18:28"

sage gust Apr 5, 2023, 1:33 AM

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bigbrain

uneven nebula Apr 5, 2023, 1:33 AM

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now the thing is it's not telling me more than that, I'll try to see what it is doing

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"error: wasm-ld: entry symbol not defined (pass --no-entry to suppress): _start"

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ok this one should be easy

sharp oyster Apr 5, 2023, 1:35 AM

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wraith dragon This applies to many system libraries which are generally packaged by the system...

Right; but the point is... "and?"
It's not like disk size is a problem here. And if your libraries are huge, then that sounds like a reason to avoid that library.

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The advantage is that you have more control over what code is actually being used in your program.

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And being static, it makes it easier to support more systems.

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Things like one binary for all Linuxes, etc.

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There's a lot of things involved in the equation here, of course.

wraith dragon Apr 5, 2023, 1:36 AM

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sharp oyster Right; but the point is... "and?" It's not like disk size is a problem here. And...

It's not like disk size is a problem here
But download size and compilation speed are.

"just avoid it" doesn't work when you have dependencies that are basically irreplaceable. FFmpeg is a good example, because it does a lot of stuff and is humongous.

sharp oyster Apr 5, 2023, 1:36 AM

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uneven nebula the only time I even came close to mentioning os stuff is when I did the target ...

WASM32 has no filesystem, and Zig's panic handler will attempt to read the exe's own debug info. That might be it.

wraith dragon Apr 5, 2023, 1:37 AM

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sharp oyster And being static, it makes it easier to support more systems.

You can just statically link a distributed binary anyway? I'm talking about the source distribution.

uneven nebula Apr 5, 2023, 1:38 AM

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sharp oyster WASM32 has no filesystem, and Zig's panic handler will attempt to read the exe's...

actually

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I had a pub var inside onInit that I was initializing

sharp oyster Apr 5, 2023, 1:39 AM

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wraith dragon > It's not like disk size is a problem here But download size and compilation sp...

Again though, if your deps are big enough to matter, consider avoiding that library.
I also never said there weren't exceptions to the rule here; hence the term 'avoid', right.
The point is that it's generally better, and is a thing to avoid.

uneven nebula Apr 5, 2023, 1:39 AM

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I had

pub var something: someType = undefined;
...
export fn onInit() void {
    something = someType.init();
    ...
}

sharp oyster Apr 5, 2023, 1:40 AM

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uneven nebula I had ```rust pub var something: someType = undefined; ... export fn onInit() v...

Interesting; that doesn't strike me as being what causes that. 🤔

uneven nebula Apr 5, 2023, 1:40 AM

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well I removed that

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from onInit

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and it didn't complain anymore

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it's complaining about something else now

sharp oyster Apr 5, 2023, 1:40 AM

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Odd.

uneven nebula Apr 5, 2023, 1:41 AM

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error: wasm-ld: entry symbol not defined (pass --no-entry to suppress): _start

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what do I put in build.zig to tell pass --no-entry ?

sharp oyster Apr 5, 2023, 1:42 AM

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You build a library instead of an exe, if you're not already.

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Specifically a dynamic library in WASM's case.

uneven nebula Apr 5, 2023, 1:42 AM

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I wasn't because last time it didn't work

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do I just change the addExecutable to addSharedLibrary?

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or do I make it a static one?

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o

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it worked

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it pooped out a library now

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weird, 1-2 hours ago it didn't

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earlier it would build invalid wasm objects

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now it works?

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hey

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I'm not saying no

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it seems to function

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thanks a lot guys

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this saved my ass

#error: "epoxy/gl.h" file not found