cargo build/run unconditionally rebuilds the target

[crumblingstatue]

Since a recent cargo update ( I don't know which ), cargo build / cargo run rebuilds my project unconditionally every time. It doesn't rebuild the dependencies, only the target.

Reproduction:

cargo new foo && cd foo && cargo build && cargo build

I expect that this would only rebuild foo once, but instead, this is the output:

   Compiling foo v0.0.1 (...)
   Compiling foo v0.0.1 (...)

Cargo version: cargo 0.0.1-pre-nightly (dd7c7bd 2015-03-04) (built 2015-03-04)
Rustc version: rustc 1.0.0-nightly (b0746ff19 2015-03-05) (built 2015-03-06)
OS: Linux 3.19.0-1-ARCH #1 SMP PREEMPT Mon Feb 9 07:08:20 CET 2015 x86_64 GNU/Linux

[alexcrichton]

Unfortunately this is caused by rust-lang/rust#23090, but hopefully that fix will land soon!

[hugoduncan]

Would rust-lang/rust#23090 also be causing unconditional rebuilds of dependencies with paths specified in .cargo/config?

[alexcrichton]

It would indeed!