GopherJ
commented
4 years ago See also: https://github.com/hecrj/iced/issues/536
Open GopherJ opened 4 years ago
GopherJ
commented
4 years ago See also: https://github.com/hecrj/iced/issues/536
GopherJ
commented
4 years ago The script that I used to compile is located at:
https://github.com/GopherJ/cfg/blob/master/scripts/osxcross.sh
Environments:
System: Linux Mint 20 Cinamon Rust: rustc 1.46.0-nightly (feb3536eb 2020-06-09)
GopherJ
commented
4 years ago Am I missing something?
grovesNL
commented
4 years ago wgpu uses Metal.framework (normally available in macOS/iOS SDKs), so the argument "-framework" "Metal" will try to link to Metal.framework and fail if it can't be found.
I'm not sure how easy or possible it is to use the macOS SDK (specifically Metal.framework) from Linux for cross-compilation. I've heard it's possible at least (e.g. @kvark mentioned that Gecko cross-compiles wgpu for macOS from a Linux host). Unfortunately we haven't been using cross-compilation in this project (we use macOS hosts), so we don't have much experience with this.
kvark
commented
4 years ago @grovesNL Firefox CI already does it. The Firefox macOS builds are produced on Linux, and they include wgpu.
The secret was to link with -weak-framework Metal, see https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html#//apple_ref/doc/uid/20002378-107026
grovesNL
commented
4 years ago Alright thanks! So it sounds the cross-compilation can already be done manually by replacing "-framework" "Metal" with "-weak_framework" "Metal", and longer term we might want to consider changing how this works upstream in our metal bindings (gfx-rs/metal-rs#105).
@GopherJ would you like to try manually running the "x86_64-apple-darwin14-clang" "-m64" "-L" ... command from above, but replacing "-framework" "Metal" with "-weak_framework" "Metal"?
GopherJ
commented
4 years ago @grovesNL Thanks for your reply, is there a way to do this through cargo?
To reproduce:
clone iced
git clone https://github.com/hecrj/icedchange working directory
cd examples/game_of_lifecurl -O https://raw.githubusercontent.com/GopherJ/cfg/master/scripts/osxcross.sh
chmod u+x osxcross.sh./osxcross.shI'm not sure if there's a way to do it with cargo directly – we'd need to intercept the build command generated by cargo to replace the framework with weak_framework for Metal and run that. I was thinking we could just try manually running that "x86_64-apple-darwin14-clang" ... command from above with the replacement to check if it works for you.
(the eventual fix will probably be gfx-rs/metal-rs#105, but hoping we could workaround it for now)
grovesNL
commented
4 years ago I tried specifying weak_framework on the externs:
#[link(name = "Metal", kind = "weak_framework")]
extern "C" {
/* ... */
}but that fails with unknown kind:
error[E0458]: unknown kind: `weak_framework`
--> src/device.rs:1352:24
|
1352 | #[link(name = "Metal", kind = "weak_framework")]
| -----------------------^^^^^^^^^^^^^^^^^^^^^^^--
| |
| unknown kind
error: aborting due to previous errorI also tried using build.rs and passing it as an linker argument there:
fn main() {
println!("cargo:rustc-link-lib=weak_framework=Metal");
}but that also fails:
error: unknown library kind `weak_framework`, expected one of dylib, framework, or staticSo it looks like we'll have to find some other ways to pass weak_framework to the linker. I think it's possible to do it with a custom .cargo/config but we can't use that here either.
kvark
commented
4 years ago Could you file a bug to rust-lang about "weak_framework" not recognized as an option?
grovesNL
commented
4 years ago I asked on Zulip and Discourse, I guess we can track updates in https://github.com/gfx-rs/metal-rs/issues/105#issuecomment-720811909
While cross compiling
icedI came across an error onwgpu-native:Any idea on this?