Commits on Sep 29, 2016

1. Warn about path overrides that won't work …

   Cargo has a long-standing [bug] in path overrides where they will cause spurious
   rebuilds of crates in the crate graph. This can be very difficult to diagnose
   and be incredibly frustrating as well. Unfortunately, though, it's behavior that
   fundamentally can't be fixed in Cargo.
   
   The crux of the problem happens when a `path` replacement changes something
   about the list of dependencies of the crate that it's replacing. This alteration
   to the list of dependencies *cannot be tracked by Cargo* as the lock file was
   previously emitted. In the best case this ends up causing random recompiles. In
   the worst case it cause infinite registry updates that always result in
   recompiles.
   
   A solution to this intention, changing the dependency graph of an overridden
   dependency, was [implemented] with the `[replace]` feature in Cargo awhile back.
   With that in mind, this commit implements a *warning* whenever a bad dependency
   replacement is detected. The message here is pretty wordy, but it's intended to
   convey that you should switch to using `[replace]` for a more robust
   impelmentation, and it can also give security to anyone using `path` overrides
   that if they get past this warning everything should work as intended.
   
   [bug]: rust-lang#2041
   [implemented]: http://doc.crates.io/specifying-dependencies.html#overriding-dependencies
   
   Closes rust-lang#2041

   

   alexcrichton committed Sep 29, 2016
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