linux-kernel - Re: [PATCH v2] tools/sched_ext: Improve cross-compilation support in Makefile

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Message-ID: <CA+P2CkZ3c6MvaX7RDy_0x9VuXDqKPisOPdW1rndrgwJoPCkjwg@mail.gmail.com>
Date: Wed, 16 Apr 2025 09:24:31 +0800
From: Eric yang <jluyangsonghua@...il.com>
To: Tejun Heo <tj@...nel.org>
Cc: void@...ifault.com, arighi@...dia.com, changwoo@...lia.com, 
	linux-kernel@...r.kernel.org, sched-ext@...a.com, 
	yangsonghua <yangsonghua@...iang.com>
Subject: Re: [PATCH v2] tools/sched_ext: Improve cross-compilation support in Makefile

Okay, v1 works well. I misunderstood your intentions last time. Please
disregard v2.

Thanks
Eric

Tejun Heo <tj@...nel.org> 于2025年4月15日周二 22:57写道：
>
> On Tue, Apr 15, 2025 at 01:46:42PM +0800, yangsonghua wrote:
> > Modify the tools/sched_ext/Makefile to better handle cross-compilation
> > environments by:
> >
> > 1. Adjusted `HOST_OUTPUT_DIR` to be relative to `$(OBJ_DIR)`, ensuring
> >    correct path handling during host tool building when cross-compile
> >    (HOST_OUTPUT_DIR now points to $(OBJ_DIR)/host-tools)
> > 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
> >
> > 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@...iang.com>
>
> I already applied v1, so please send the updates as incremental changes
> atop.
>
> Thanks.
>
> --
> tejun