On 2022-01-25, Grant Edwards grant.b.edwards@gmail.com wrote:
I'm working on a Renesas supplied port of U-Boot, and it seems that 'make' always compiles every single (configured) source file instead compiling only the source files that have been changed since the previous 'make'.
This problem appears to be caused by an incompatibility between the Kbuild infrastructure2 and GNU make-4.3. Switching to make-4.2.1 solved the problem.
The U-Boot source tree we're using is the v2017.01 branch. It's the latest supported by the Renesas board support files. I'm not very happy they haven't contributed the supported upstream to make it easier to support newer versions. I've asked Renesas about this, and they have no plans to either support a newer version of U-Boot or contribute their support files. :/
I assume that this Kbuild incompatibility with make-4.3 has been fixed in newer versions of U-Boot.
If this Kbuild problem is familiar to anybody, and you know where the fix was made, I'd appreciate a pointer so that I can back-port that fix to my v2017.01 sources.
Thanks...
-- Grant