[Buildroot] [PATCH 1/1] rust: make sure the cxx compiler is also set for the target

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

Thanks for the quick feedback!

On Sun, 1 Apr 2018 22:52:42 +0000, Charles Hardin wrote:
> We have a problem where we build on a HOST with x86_64 and RUST
> doesn?t realize the difference between the host tool chain and the buildroot
> toolchain.
> 
> In the old days - we had to patch rust to make a ?x86_64-buildroot-linux-gnu?
> target that would be recognized, but the latest patches removed that around
> rust 1.9 or so.
> 
> This was literally just looking at the logs and seeing the ?cc? was the buildroot
> cc and the the cxx was ?c++?, so it is just what we hacked together to get
> things to work.
> 
> But - definitely need to set ?cxx? in some appropriate fashion for rust to get
> compiled correctly.

Setting cxx looks definitely OK in your patch. It's the
RUSTC_HOST_NAME != RUSTC_TARGET_NAME that looks wrong.

Could you provide some specific examples (with defconfigs to reproduce)
for the two problems:

 - Lack of cxx variable

 - Case of RUSTC_HOST_NAME == RUSTC_TARGET_NAME

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com