Bootstrap tries to use stage0 Cargo with local Rust/Cargo in config.toml

[abonander]

In config.toml (I'm on Windows):

[build]
cargo = "C:/Users/my_user/.cargo/bin/cargo"
rustc = "C:/Users/my_user/.cargo/bin/rustc"

Then python x.py build yields:

Updating only changed submodules
Submodules updated in 0.42 seconds
   Compiling unicode-xid v0.1.0
   Compiling winapi v0.3.4
   Compiling cfg-if v0.1.2
   Compiling serde v1.0.37
   Compiling libc v0.2.40
   Compiling fixedbitset v0.1.9
   Compiling cc v1.0.9
   Compiling num-traits v0.2.2
   Compiling dtoa v0.4.2
   Compiling ordermap v0.3.5
   Compiling itoa v0.4.1
   Compiling getopts v0.2.17
   Compiling lazy_static v0.2.11
   Compiling build_helper v0.1.0 (file:///C:/Users/cyber/Rust/rust/src/build_helper)
   Compiling proc-macro2 v0.3.1
   Compiling filetime v0.1.15
   Compiling num_cpus v1.8.0
   Compiling petgraph v0.4.12
   Compiling cmake v0.1.29
   Compiling quote v0.5.1
   Compiling serde_json v1.0.13
   Compiling toml v0.4.5
   Compiling syn v0.13.1
   Compiling time v0.1.39
   Compiling serde_derive_internals v0.23.0
   Compiling serde_derive v1.0.37
   Compiling bootstrap v0.0.0 (file:///C:/Users/cyber/Rust/rust/src/bootstrap)
    Finished dev [unoptimized] target(s) in 55.32 secs


failed to execute command: "C:\\Users\\my_user\\Rust\\rust\\build\\x86_64-pc-windows-msvc\\stage0/bin\\cargo.exe" "metadata" "--format-version" "1" "--manifest-path" "C:\\Users\\my_user\\Rust\\rust\\src/libstd\\Cargo.toml"
error: The system cannot find the file specified. (os error 2)


failed to run: C:\Users\my_user\Rust\rust\build\bootstrap\debug\bootstrap build
Build completed unsuccessfully in 0:00:58

[ishitatsuyuki]

@Mark-Simulacrum You seem to recently modified the bootstrap. Can this be #48913?

[ollie27]

#49759 should fix this