can not compile ipc-demo with rustc 1.39.0-nightly

[feine-moehre]

I can not compile your ipc-demo:

rust-beagleboardx15-demo/bare-metal/ipu-demo$ cargo +nightly build  
error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `rustc - --crate-name ___ --print=file-names -C link-arg=-Tam5728_ipu.ld -C linker=arm-none-eabi-ld -Z linker-flavor=ld -Z thinlto=no --target thumbv7em-none-eabi --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=cfg` (exit code: 1)
--- stderr
error: unknown debugging option: `linker-flavor`

The error maybe relates to .cargo/config line 6: "-Z", "linker-flavor=ld"
The linker option makes some trouble?

[davidthomaswood]

Thanks for the report - I can reproduce this here, so have just added a PR to add support for the latest nightly