Specifying the manifest path ignores .cargo/config.toml

[allsey87]

Problem

When specifying --manifest-path=dir/Cargo.toml the .cargo/config.toml files appear to be ignored. It doesn't seem to matter whether .cargo/config.toml is (e.g., in my crates, workspace, or the directory from which I am running Cargo). It is always ignored.

Steps

1. Place some configuration in a .cargo/config.toml file. For example, I have:

[build]
target = "wasm32-unknown-unknown"

So that Cargo compiles to WebAssembly by default.
2. Run cargo build --manifest-path=path/to/Cargo.toml
3. Observe that instead of WebAssembly, Cargo is producing shared libraries (i.e., .so on Linux)

Possible Solution(s)

No response

Notes

No response

Version

cargo 1.57.0 (b2e52d7ca 2021-10-21)
release: 1.57.0
commit-hash: b2e52d7cab0a286ee9fcc0c17510b1e72fcb53eb
commit-date: 2021-10-21
host: x86_64-unknown-linux-gnu
libgit2: 1.3.0 (sys:0.13.23 vendored)
libcurl: 7.79.1-DEV (sys:0.4.49+curl-7.79.1 vendored ssl:OpenSSL/1.1.1l)
os: Arch Linux Rolling Release [64-bit]

[ehuss]

Thanks for the report! Config searching is always done from the current working directory.

This is a bit of a known issue, so I'm going to close as a duplicate of #2930, #9769, and #10098.

[allsey87]

@ehuss thanks for the quick response! I would add though that I tried adding the .cargo directory with the config.toml inside it to the working directory to no avail.

[ehuss]

It should, unless something else is overriding it. Can you show a complete example? For example:

~/Temp> mkdir foo
~/Temp> cd foo
~/Temp/foo> mkdir .cargo
~/Temp/foo> cat > .cargo/config.toml << EOF
> [build]
target = "wasm32-unknown-unknown"
> EOF
~/Temp/foo> cargo new myproj
     Created binary (application) `myproj` package
~/Temp/foo> cargo build --manifest-path myproj/Cargo.toml
   Compiling myproj v0.1.0 (/Users/eric/Temp/foo/myproj)
    Finished dev [unoptimized + debuginfo] target(s) in 1.42s
~/Temp/foo> ls -al myproj/target/wasm32-unknown-unknown/debug/myproj.wasm
-rwxr-xr-x  1 eric  staff  1664827 Jan 17 08:40 myproj/target/wasm32-unknown-unknown/debug/myproj.wasm