Missing targets when requested from metadata

[kpreid]

In https://docs.rs/wgpu/0.19.1/wgpu/index.html and https://docs.rs/wgpu/0.19.0/wgpu/index.html, the Platform menu lists only x86_64-pc-windows-msvc and x86_64-unknown-linux-gnu, even though the Cargo.toml contains

[package.metadata.docs.rs]
targets = [
    "x86_64-unknown-linux-gnu",
    "x86_64-apple-darwin",
    "x86_64-pc-windows-msvc",
    "wasm32-unknown-unknown",
]

The prior version https://docs.rs/wgpu/0.18.0/wgpu/ does have wasm32-unknown-unknown, but still not x86_64-apple-darwin. It seems like in both cases certain targets are being silently ignored (even the build log has no info on this) and this has gotten worse between the two versions.

[Nemo157]

The issue will be that those targets failed to build, nothing being shown in the build logs is #787

Trying cargo rustdoc --target wasm32-unknown-unknown locally gives an explicit compile_error!:

error: webgpu feature used without web_sys_unstable_apis config:
       Here are some ways to resolve this:
       * If you wish to use webgpu backend, create a .cargo/config.toml in the root of the repo containing:
           [build]
           rustflags = [ "--cfg=web_sys_unstable_apis" ]
           rustdocflags = [ "--cfg=web_sys_unstable_apis" ]
       * If you wish to disable webgpu backend and instead use webgl backend, change your wgpu Cargo.toml entry to:
           wgpu = { version = "", default-features = false, features = ["webgl"] }
  --> src/backend/mod.rs:7:1
   |
7  | / compile_error!(
8  | |     "webgpu feature used without web_sys_unstable_apis config:
9  | | Here are some ways to resolve this:
10 | | * If you wish to use webgpu backend, create a .cargo/config.toml in the root of the repo containing:
...  |
16 | | "
17 | | );
   | |_^

while x86_64-apple-darwin appears to fail to cross-compile a dependency

warning: objc_exception@0.1.2: gcc: error: unrecognized command-line option ‘-arch’
warning: objc_exception@0.1.2: gcc: error: unrecognized command-line option ‘-mmacosx-version-min=10.7’

error: failed to run custom build command for `objc_exception v0.1.2`

(I've recently noticed that there's now https://github.com/dtolnay/cargo-docs-rs which could be used to test the docs build in CI relatively similarly to how it will run on docs.rs)

[kpreid]

Thanks! I've copied this info to the wgpu issue tracker.

I assume there's no reason to keep this issue open.

[syphar]

triggered by this discussion I had another look at logging non-default build targets: #2427