From: Nicholas Piggin <npiggin@gmail.com>
To: linux-kbuild@vger.kernel.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
linuxppc-dev@lists.ozlabs.org
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 [thread overview]
Message-ID: <20180510051659.15356-2-npiggin@gmail.com> (raw)
In-Reply-To: <20180510051659.15356-1-npiggin@gmail.com>
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 <npiggin@gmail.com>
---
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
next prev parent reply other threads:[~2018-05-10 5:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-10 5:16 [PATCH v2 0/5] kbuild and powerpc patches for new Kconfig language Nicholas Piggin
2018-05-10 5:16 ` Nicholas Piggin [this message]
2018-05-10 13:10 ` [PATCH v2 1/5] powerpc/kbuild: set default generic machine type for 32-bit compile Segher Boessenkool
2018-05-10 13:24 ` Nicholas Piggin
2018-05-10 14:29 ` Segher Boessenkool
2018-05-10 14:52 ` Segher Boessenkool
2018-05-10 5:16 ` [PATCH v2 2/5] powerpc/kbuild: remove CROSS32 defines from top level powerpc Makefile Nicholas Piggin
2018-05-10 5:16 ` [PATCH v2 3/5] kbuild: call cc-option with the current set of KBUILD_CFLAGS Nicholas Piggin
2018-05-10 5:29 ` Masahiro Yamada
2018-05-10 6:09 ` Nicholas Piggin
2018-05-10 5:16 ` [PATCH v2 4/5] powerpc/kbuild: Use flags variables rather than overriding LD/CC/AS Nicholas Piggin
2018-05-10 13:03 ` Michael Ellerman
2018-05-10 13:11 ` Nicholas Piggin
2018-05-10 5:16 ` [PATCH v2 5/5] powerpc/kbuild: move -mprofile-kernel check to Kconfig Nicholas Piggin
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