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

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Message-ID: <Z_0_YsO2P4nM7LXM@slm.duckdns.org>
Date: Mon, 14 Apr 2025 07:01:22 -1000
From: Tejun Heo <tj@...nel.org>
To: yangsonghua <jluyangsonghua@...il.com>
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 v1] sched_ext: Improve cross-compilation support in
 Makefile

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@...iang.com>

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