linux-kernel - arch/x86/Makefile REALMODE_CFLAGS needs -std=gnu11 with recent GCC versions

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Message-ID: <e4742cae-9ef5-4d30-8c88-65f69e2178cd@blastwave.org>
Date: Sun, 29 Jun 2025 11:15:13 -0400
From: Dennis Clarke <dclarke@...stwave.org>
To: linux-kernel@...r.kernel.org
Subject: arch/x86/Makefile REALMODE_CFLAGS needs -std=gnu11 with recent GCC
 versions

Code fix for due to https://bugzilla.kernel.org/show_bug.cgi?id=220294

The summary is that recent GCC versions ( 15.1.0 today ) will assume C23
spec compliance and get upset with ye old A20 address line code bits.

This problem exists previous to the 6.12.35 release tarballs and is
fixed with commit b3bee1e7c3f2b1b77182302c7b2131c804175870 applied.

The newer GCC revisions will be quite popular soon enough and this may
bite people when that happens.

-- 
--
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
Beard and Suspenders installed