Cross compilation broken since #146

[igiona]

Since #146 our build is broken.

| error: linker `cc` not found
|   |
|   = note: No such file or directory (os error 2)
| 

Reverting to 7ac87ec the build works again.

Our setup

• Host: Ubuntu 22.0
  Running on: https://github.com/actions/runner-images/blob/main/images/linux/Ubuntu2204-Readme.md#rust-tools
• Target armv7-unknown-linux-gnueabihf

It looks like the linker configuration is not properly set.
In the changes you switched to the "environment variable configuration" approach instead of the config file approach.

Likely CARGO_TARGET_${@rust_target(d, 'BUILD').replace('-','_')}_LINKER gets somehow wrongly set.

Could this be the issue pherhaps?

[benjamin-nw]

Hello,

Same problem with the setup:

• Host: Ubuntu 20.04
• Target: aarch64-unknown-linux-gnu

I also found that the line you mentioned CARGO_TARGET_${@rust_target(d, 'BUILD').replace('-','_')}_LINKER is not working correctly.

I've managed to fix it with 2 steps:

• Replace rust_target(d, 'BUILD') by rust_target(d, 'TARGET)`.
  • The BUILD was returning x86_64 architecture instead of aarch64.
• Apply uppercase to the rust_target returned, else the variable is a mix of uppercase and lowercase.
  • The correct cargo variable is uppercase (i.e CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER).

- CARGO_TARGET_${@rust_target(d, 'BUILD').replace('-','_')}_LINKER
+ CARGO_TARGET_${@rust_target(d, 'TARGET').replace('-','_').upper()}_LINKER

I've also looked at the implementation in buildroot in order to see if it was correct.

Everything else seems alright and I was able to build.

Tell me if this is working for you too.

[igiona]

@Benji-NW I came to your same conclusion and it fixed in the same way.
I also created a PR for this: #152

[eldruin]

Closing since this was fixed in #152.
Thank you and feel free to comment or reopen if there are additional concerns.