On Tue, Jan 25, 2022 at 03:50:43PM -0000, Grant Edwards 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'. I've never run into this before on projects that use 'make', and it makes development of U-Boot rather grueling.
Is that due to something Renesas broke?
Or is that a "feature" of the standard U-Boot Makefile?
So, it partly depends on what version of U-Boot that you're working on top of. It's still to me a relatively recent set of improvements that fix a number of reproducible build changes and so that with a constant SOURCE_DATE_EPOCH nothing is rebuilt that hasn't changed, and so it's also true that re-running "make" only rebuilds the few files that would change due to time stamp usage, which has also been corrected.