west burrow
I want to detect the environment at runtime so that the program acts accordingly, but I get an error with this trace. I don't want the envars at comptime. I want them at runtime.
/home/rocketeer/compile/zig/build/stage3/lib/zig/std/os.zig:2046:10: error: unable to evaluate comptime expression
for (environ) |ptr| {
^~~~~~~
src/modules/window/window_system.zig:194:34: note: called from here
if (std.os.getenv("XDG_SESSION_TYPE") == null) {
gilded folio
where is that line in your file?
west burrow
fn setup_platform(desired_platform: PlatformEnum) PlatformError!Platform {
const target = switch (builtin.os.tag) {
.linux, .freebsd, .netbsd, .openbsd, .dragonfly, .solaris => {
if (std.os.getenv("XDG_SESSION_TYPE") == null) {
return PlatformError.XDGSessionTypeEnvarNotSet;
} else if (std.os.getenv("WAYLAND_DISPLAY") != null) {
.WAYLAND;
} else if (std.os.getenv("DISPLAY") != null) {
.X11;
} else {
return PlatformError.DisplayEnvarNotSet;
}
},
.windows => .WIN32,
.macos, .ios => .COCOA,
else => {
return PlatformError.UnsupportedPlatform;
},
};
pub fn init() !WindowSystem {
...
window_system.platform = try setup_platform(window_system.hints.init.platform_id);
return window_system;
}
called from
pub fn Module(comptime T: type, comptime name: []const u8) type {
return struct {
const Self = @This();
const ModuleType = T;
module: ModuleType,
enabled: bool = true,
ready: bool = false,
pub fn init() Self {
log(.DEBUG, "Initializing module\n", .{});
const module = .{
.module = ModuleType.init() catch |err| {
log(.ERROR, name, "Unable to initialize module: {s}\n", .{@errorName(err)});
return .{
.module = undefined,
.enabled = false,
};
},
};
return module;
}
...
from
pub fn main() void {
var module_window = module.Module(window_system.WindowSystem, "WindowSystem").init();
...
Any clue?
gilded folio
im struggling to see the problem
what if you do const target: Platform instead of just const target? im grasping at straws a little bit here, i dont think what youre doing is allowed but i dont see how it could cause that error message
west burrow
It doesn't change anything 😦
I could do const target: i32 and it still gets to the comptime error before it realizes that target is the wrong type
gilded folio
is this code hosted anywhere?
west burrow
I can push it to my git
Here it is.
There are plenty of other zig errors too that I haven't gotten to yet tho.
I gotta warn you, the repo is pretty messy rn.
west burrow
std bug?
gilded folio
oh i think i got it
wowowow what unfortunate error reporting
src/main.zig:8:9: error: variable of type 'modules.module.Module(modules.window.window_system.WindowSystem,"WindowSystem")' must be const or comptime
var module_window = module.Module(window_system.WindowSystem, "WindowSystem").init();
^~~~~~~~~~~~~
src/modules/module.zig:8:17: note: struct requires comptime because of this field
module: ModuleType,
^~~~~~~~~~
src/modules/window/window_system.zig:163:15: note: struct requires comptime because of this field
platform: Platform,
^~~~~~~~
src/modules/window/window_system.zig:36:15: note: struct requires comptime because of this field
init: fn (Self) void,
^~~~~~~~~~~~~~
src/modules/window/window_system.zig:36:15: note: use '*const fn (comptime modules.window.window_system.WindowSystem) void' for a function pointer type
init: fn (Self) void,
^~~~~~~~~~~~~~
it goes on for like 100+ lines
basically raw function types are comptime only
west burrow
😵
gilded folio
after changing all of those to function pointers youll get an error about PFN_VkGetInstanceProcAddr being generic because of the anytype
west burrow
so this means I can't pass functions as data
gilded folio
i believe you could use comptime fields but those are a little weird
they cant be changed
west burrow
Ok. Thanks so much for the help.