Doesn't work for custom lib.rs filename

[ogoffart]

I'm using a custom filename in my Cargo.toml like so:

[lib]
crate-type = ["cdylib"]
path = "custom.rs"

Then, if i run x build --arch arm64 --platform android , i'd have an output like so:

[1/3] Fetch precompiled artifacts
info: component 'rust-std' for target 'aarch64-linux-android' is up to date
[1/3] Fetch precompiled artifacts [112ms]
[2/3] Build rust `my_app` [SKIPPED]
[3/3] Create apk [429ms]

It wouldn't build the app and just print [SKIPPED].
It took me a while to realize this is because I'm using a custom path and there is no src/lib.rs
Probably due to this check.

xbuild/xbuild/src/command/build.rs

Line 30 in 268939a

let has_lib = env.root_dir().join("src").join("lib.rs").exists();

I'm not quite sure why this check is there, but I would recommend checking the existence of a [lib] section in Cargo.toml as well.

[MarijnS95]

@ogoffart indeed! I've previously solved this for cargo-apk (""deprecated"") in rust-mobile/cargo-subcommand#17 (including renames via name = ""), and am now mostly unhappy that xbuild has mostly copy-pasted older implementations rather than reusing that crate (or any other crate that parses/reflects a workspace). To the point that I don't feel like typing up the solutions for the second time :)