Ensure that devices can include proc_macros, which are host-only
and may include host-only dependencies.
Bug: 141491501
Test: Soong tests pass.
Test: Test fails as expected when removing CL 1126496
Change-Id: I3ae7ab80283cd1fd4b800a533cb3205b3c108d45
Currently proc_macros don't pull in the correct arch dependencies when
the host arch differs from the target arch.
This fixes how proc_macro dependencies are handled by defining them as
always being host-only and including them as dependencies for
device-modules by using AddFarVariationDependencies.
Bug: 141491501
Test: Example device rust module builds with proc_macro dependency.
Change-Id: Ic037dc406ce90526f8b68c92fffc0d93a498a4ff
The Rust toolchain only supports Linux hosts, so skip Rust tests
that depend on host toolchains when building on other platforms.
Test: Tests still run on Linux hosts
Bug: 140435149
Change-Id: I298b52589ab5c6a7ec3acc4db1111596cd995d76
Adds support to Soong for building rust modules. This currently only
supports x86_64 device and x86 linux host targets. The functionality
is sufficient to build crosvm.
Bug: 136189233
Test: Test module builds.
Test: crosvm builds.
Change-Id: I6ea04615834a6d673578ab10ea1a2eb04259fe09
