linux-kernel - [PATCH v2 2/4] s390: boot, purgatory: pass $(CLANG

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Date:   Mon, 15 Apr 2019 10:35:52 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>
Cc:     clang-built-linux@...glegroups.com,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        linux-s390@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Philipp Rudo <prudo@...ux.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/4] s390: boot, purgatory: pass $(CLANG_FLAGS) where needed

The purgatory and boot Makefiles do not inherit the original cflags,
so clang falls back to the default target architecture when building it,
typically this would be x86 when cross-compiling.

Add $(CLANG_FLAGS) everywhere so we pass the correct --target=s390x-linux
option when cross-compiling.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/s390/Makefile           | 4 ++--
 arch/s390/purgatory/Makefile | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/Makefile b/arch/s390/Makefile
index 9c079a506325..9a228786e34f 100644
--- a/arch/s390/Makefile
+++ b/arch/s390/Makefile
@@ -17,9 +17,9 @@ KBUILD_CFLAGS_MODULE += -fPIC
 KBUILD_AFLAGS	+= -m64
 KBUILD_CFLAGS	+= -m64
 aflags_dwarf	:= -Wa,-gdwarf-2
-KBUILD_AFLAGS_DECOMPRESSOR := -m64 -D__ASSEMBLY__
+KBUILD_AFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -D__ASSEMBLY__
 KBUILD_AFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),$(aflags_dwarf))
-KBUILD_CFLAGS_DECOMPRESSOR := -m64 -O2
+KBUILD_CFLAGS_DECOMPRESSOR := $(CLANG_FLAGS) -m64 -O2
 KBUILD_CFLAGS_DECOMPRESSOR += -DDISABLE_BRANCH_PROFILING -D__NO_FORTIFY
 KBUILD_CFLAGS_DECOMPRESSOR += -fno-delete-null-pointer-checks -msoft-float
 KBUILD_CFLAGS_DECOMPRESSOR += -fno-asynchronous-unwind-tables
diff --git a/arch/s390/purgatory/Makefile b/arch/s390/purgatory/Makefile
index ce6a3f75065b..ecd0b3847fef 100644
--- a/arch/s390/purgatory/Makefile
+++ b/arch/s390/purgatory/Makefile
@@ -22,6 +22,7 @@ KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes
 KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare
 KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
 KBUILD_CFLAGS += -c -MD -Os -m64 -msoft-float -fno-common
+KBUILD_CFLAGS += $(CLANG_FLAGS)
 KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
 KBUILD_AFLAGS := $(filter-out -DCC_USING_EXPOLINE,$(KBUILD_AFLAGS))
 
-- 
2.20.0