Alex Crichton 8c963c07a8 rustc: Support output filenames for each emit type
Currently the compiler supports the ability to emit multiple output types as
part of one compilation (e.g. asm, LLVM IR, bytecode, link, dep-info, etc). It
does not, however, support the ability to customize the output filename for each
of these output types. The `-o` flag is ignored if multiple emit types are
specified (and the compiler emits a warning about this).

Normally this doesn't matter too much, but in the case of `dep-info` it can lead
to a number of problems (e.g. see ). By allowing customization of the
output filename for each emit type we're able to solve the problems in that
issue.

This commit adds support for the `--emit` option to the compiler to look like:

    rustc foo.rs --emit dep-info=.deps/foo.d,link

This indicates that the `dep-info` output type will be placed at `.deps/foo.d`
and the `link` output type will otherwise be determined via the `--out-dir` and
`-o` flags.

Closes 
2015-09-30 11:12:30 -07:00
..