tree effbeb8ffd67e271cbf34e9fe88dcf5d83d5c56e
parent 783cc138f9ac3e7ca214317e44a3b04bcbb334cb
author Aaron Wood <aaronwood@google.com> 1591823001 -0700
committer Commit Bot <commit-bot@chromium.org> 1596235798 +0000

[rust project] Extract compiler target

Extract the compiler arguments, and then from them, the compilation
target triple that is being passed to rustc.

This is also a step towards deduplicating targets by compilation
target and options (combining test and non-test, and preferring
cross-compilation targets over the host (default toolchain over
a separate toolchain, if there are multiple listings of the same
rlib/binary/test.

Change-Id: I1af0ef2da5dca41729e9367389048a068efd7959
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/8840
Commit-Queue: Aaron Wood <aaronwood@google.com>
Reviewed-by: Tyler Mandry <tmandry@google.com>