From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f196.google.com ([209.85.192.196]:35092 "EHLO mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756220AbeEJFRO (ORCPT ); Thu, 10 May 2018 01:17:14 -0400 Received: by mail-pf0-f196.google.com with SMTP id x9-v6so495238pfm.2 for ; Wed, 09 May 2018 22:17:13 -0700 (PDT) From: Nicholas Piggin Subject: [PATCH v2 1/5] powerpc/kbuild: set default generic machine type for 32-bit compile Date: Thu, 10 May 2018 15:16:55 +1000 Message-Id: <20180510051659.15356-2-npiggin@gmail.com> In-Reply-To: <20180510051659.15356-1-npiggin@gmail.com> References: <20180510051659.15356-1-npiggin@gmail.com> Sender: linux-kbuild-owner@vger.kernel.org List-ID: To: linux-kbuild@vger.kernel.org Cc: Nicholas Piggin , Masahiro Yamada , linuxppc-dev@lists.ozlabs.org The 64-bit toolchain uses the wrong ISA variant for compiling 32-bit kernels, eve with -m32. Set -mcpu=powerpc which is the generic 32-bit powerpc machine type and scheduling model. 32-bit platforms and CPUs can override this with -mcpu= options that come later on the command line. This fixes a lot of build failures due to incompatible assembly when compiling 32-bit kernel with 64-bit toolchain. Signed-off-by: Nicholas Piggin --- arch/powerpc/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 95813df90801..7034b1ad50e0 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -27,6 +27,14 @@ KBUILD_ARFLAGS += --target=elf32-powerpc endif endif +ifdef CONFIG_PPC32 +# These options will be overridden by any -mcpu option that comes +# later on the command line, but they are needed to set a sane +# 32-bit cpu target for the 64-bit cross compiler. +KBUILD_CFLAGS += -mcpu=powerpc +KBUILD_AFLAGS += -mcpu=powerpc +endif + export CROSS32CC CROSS32AR ifeq ($(CROSS_COMPILE),) -- 2.17.0