Re: kbuild: Implicit dependence on the C compiler

["H. Peter Anvin" <hpa@zytor.com>]

Sam Ravnborg wrote:
> 
> make KBUILD_NOCMDDEP=1
> will do what you want - at least I have it in my tree now.
> I could not just ignore 'gcc' - but had to ignore the full commandline.
> 
> This is due to more complex commands like:
> rm -f file; $(LD) ...
> 

That's probably the right behaviour actually.

> Within the Makefile.lib when I check KBUILD_NOCMDDEP there is no
> knowledge of the actual command being executed. And an implmentation
> that just filtered out $(CC) was too ugly.
> And due to the above mentioned command I could not just skip the first
> word on the command line.
> 
> 
> I will push my bk tree soon and it will show up in next -mm.
> 
> It is not perfect in the sense that the last part of the build will get
> redone (GEN .version and onwards). This is fixable but not worth it
> right now.
> 
> So with current implmentation executing:
> 
> make
> 
> make KBUILD_NOCMDDEP=1 CROSS_COMPILE=i586-pc-linux-gnu-
> 
> will result in only a few files being rebuild - and not the whole
> kernel as before.

That's fair.  You got what you asked for.

	-hpa