Re: [PATCH] kbuild: rebuild GCC plugins when the compiler is upgraded

[Josh Poimboeuf]

On Thu, Mar 04, 2021 at 03:37:14PM -0800, Linus Torvalds wrote:
> On Thu, Mar 4, 2021 at 3:20 PM Kees Cook <keescook@xxxxxxxxxxxx> wrote:
> >
> > This seems fine to me, but I want to make sure Josh has somewhere to
> > actually go with this. Josh, does this get you any closer?

No, this doesn't seem to help me at all.

> > It sounds like the plugins need to move to another location for
> > packaged kernels?
> 
> Well, it might be worth extending the stuff that gets installed with
> /lib/modules/<kernel-version>/ with enough information and
> infrastruvcture to then build any external modules.

The gcc plugins live in scripts/, which get installed by "make
modules_install" already.  So the plugins' source and makefiles are in
/lib/modules/<kernel-version>/build/scripts/gcc-plugins.

So everything needed for building the plugins is already there.  We just
need the kernel makefiles to rebuild the plugins locally, when building
an external module.

-- 
Josh