Re: Make 4.3 rebuilds .o files when unnecessary

[Kaz Kylheku (gmake)]

On 2020-11-18 16:10, Kaz Kylheku (gmake) wrote:
> I regularly build the kernel as part of my work; I will build GNU Make
> 4.3 from sources and see if this reproduces.

I gave this a quick try; I built 4.3 under Ubuntu 18.04, from the 
release
tarball, and mapped it into the Docker container where I'm doing
builds of a kernel 4.9 for an ARM target. In my container, make 4.3 is
known as /local/bin/make. I added a /local/bin/make --version call to my
script to check this. It reports 4.3.

The problem does not reproduce, unfortunately.

The steps /local/bin/make $defconfig_file ; /local/bin/make uImage do
the same incremental build as they do with 4.1.

Oops!

The kernel tree I'm working with (4.9) is fairly old, though,
and probably different from yours.

If this is caused by something in the build system, it could easily
be sensitive to the kernel version.