Commits on May 30, 2017

1. rustbuild: Fix copying duplicate crates into the sysroot …

   After compiling a project (e.g. libstd, libtest, or librustc) rustbuild needs to
   copy over all artifacts into the sysroot of the compiler it's assembling.
   Unfortunately rustbuild doesn't know precisely what files to copy! Today it has
   a heuristic where it just looks at the most recent version of all files that
   look like rlibs/dylibs and copies those over. This unfortunately leads to bugs
   with different versions of the same craet as seen in rust-lang#42261.
   
   This commit updates rustbuild's strategy of copying artifacts to work off the
   list of artifacts produced by `cargo build --message-format=json`. The build
   system will now parse json messages coming out of Cargo to watch for files being
   generated, and then it'll only copy over those precise files.
   
   Note that there's still a bit of weird logic where Cargo prints that it's
   creating `libstd.rlib` where we actually want `libstd-xxxxx.rlib`, so we still
   do a bit of "most recent file" probing for those. This commit should take care
   of the crates.io dependency issues, however, as they're all copied over
   precisely.
   
   Closes rust-lang#42261

   

   alexcrichton committed May 30, 2017
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