rustbuild: can't cross compile from linux to x86_64-pc-windows-gnu

[japaric]

STR

$ python $SRC_DIR/src/bootstrap/bootstrap.py --stage 1 --step libstd-link --target x86_64-pc-windows-gnu
Building stage1 std artifacts (x86_64-unknown-linux-gnu -> x86_64-pc-windows-gnu)
   Compiling std_shim v0.1.0 (file:///shared/rust/master/src/rustc/std_shim)
error: extern location for std is of an unknown type: /home/japaric/build/x86_64-unknown-linux-gnu/stage1-std/x86_64-pc-windows-gnu/release/deps/std-e2265790837cbaa9.dll
  |
  = help: file name should be lib*.rlib or lib*..so

error: aborting due to previous error

error: Could not compile `std_shim`.

file name should be lib_.rlib or lib_..so

This looks weird. Isn't a .dll the right thing for this target?

Meta

$ git rev-parse HEAD
e77d86c142ae668038dd43594d04022cbd6bf4d8

cc @alexcrichton

[alexcrichton]

Could you try passing -v? Seems like --target may not be making its way to Cargo, or the rustc shim is really messing up here (probably the latter)