Nah, this has nothing to do with your AUR helper (pamac).
The issue is that Makefile of rkdeveloptool forces GCC to treat all warnings as errors.
Here's the solution:
https://github.com/rockchip-linux/rkdeve.../issues/25
By the way, I updated the repository to use U-Boot v2020.07 and uploaded images for SD/eMMC and SPI.
You can find them on Releases page of the repository.
The issue is that Makefile of rkdeveloptool forces GCC to treat all warnings as errors.
Here's the solution:
https://github.com/rockchip-linux/rkdeve.../issues/25
By the way, I updated the repository to use U-Boot v2020.07 and uploaded images for SD/eMMC and SPI.
You can find them on Releases page of the repository.