linux-kernel - Re: [patch 1/2] x86/vdso: Tweak CHECKFLAGS for 32-bit VDSO build

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Message-ID: <87fr7xeo7s.ffs@tglx>
Date: Thu, 22 Jan 2026 15:06:31 +0100
From: Thomas Gleixner <tglx@...nel.org>
To: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org
Subject: Re: [patch 1/2] x86/vdso: Tweak CHECKFLAGS for 32-bit VDSO build

On Mon, Jan 19 2026 at 08:18, Thomas Weißschuh wrote:
> On Sat, Jan 17, 2026 at 10:58:25PM +0100, Thomas Gleixner wrote:
>>  $(obj)/vdso32.so.dbg: KBUILD_CFLAGS = $(KBUILD_CFLAGS_32)
>>  
>> +CHECKFLAGS_32 := $(subst -m64,-m32,$(CHECKFLAGS))
>> +CHECKFLAGS_32 := $(subst -D__x86_64__,-D__i386__,$(CHECKFLAGS_32))
>> +$(obj)/vdso32.so.dbg: CHECKFLAGS = $(CHECKFLAGS_32)
>
> It would be nice if we had a strict variant of $(subst ...) which errors
> out if nothing is substituted.

Which would fail a arch=i386 build then, no? :)