Re: [PATCH v1] sched_ext: Improve cross-compilation support in Makefile

[Eric yang]

Hi Tejun,

I am pleased to receive your feedback. Based on your suggestions, I
have submitted a v2 patch.
Link：https://lore.kernel.org/lkml/20250415054642.3878839-1-yangsonghua@xxxxxxxxxxx/

Additionally, I have tested both v1 patch and v2 patch, they work
correctly in native builds or
cross-compilation scenarios.

Thank you for your guidance.
- Eric


Tejun Heo <tj@xxxxxxxxxx> 于2025年4月15日周二 01:01写道：
>
> On Mon, Apr 14, 2025 at 04:14:36PM +0800, yangsonghua wrote:
> > Modify the tools/sched_ext/Makefile to better handle cross-compilation
> > environments by:
> >
> > 1. Fix host tools build directory structure by separating obj/ from output
> >    (HOST_BUILD_DIR now points to $(OBJ_DIR)/host/obj)
> > 2. Properly propagate CROSS_COMPILE to libbpf sub-make invocation
> > 3. Add missing $(HOST_BPFOBJ) build rule with proper host toolchain flags
> >    (ARCH=, CROSS_COMPILE=, explicit HOSTCC/HOSTLD)
> > 4. Consistently quote $(HOSTCC) in bpftool build rule
> > 5. Change LDFLAGS assignment to += to allow external extensions
> >
> > The changes ensure proper cross-compilation behavior while maintaining
> > backward compatibility with native builds. Host tools are now correctly
> > built with the host toolchain while target binaries use the cross-toolchain.
> >
> > Signed-off-by: yangsonghua <yangsonghua@xxxxxxxxxxx>
>
> Doesn't break native builds at least. I take your words that this improves
> cross-builds. Applied to sched_ext/for-6.16.
>
> Thanks.
>
> --
> tejun