Commit 795285ef authored by Mark Brown's avatar Mark Brown Committed by Shuah Khan

selftests: Fix clang cross compilation

Unlike GCC clang uses a single compiler image to support multiple target
architectures meaning that we can't simply rely on CROSS_COMPILE to select
the output architecture. Instead we must pass --target to the compiler to
tell it what to output, kselftest was not doing this so cross compilation
of kselftest using clang resulted in kselftest being built for the host
architecture.

More work is required to fix tests using custom rules but this gets the
bulk of things building.
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarShuah Khan <skhan@linuxfoundation.org>
parent f2906aa8
...@@ -7,10 +7,31 @@ else ifneq ($(filter -%,$(LLVM)),) ...@@ -7,10 +7,31 @@ else ifneq ($(filter -%,$(LLVM)),)
LLVM_SUFFIX := $(LLVM) LLVM_SUFFIX := $(LLVM)
endif endif
CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) CLANG_TARGET_FLAGS_arm := arm-linux-gnueabi
CLANG_TARGET_FLAGS_arm64 := aarch64-linux-gnu
CLANG_TARGET_FLAGS_hexagon := hexagon-linux-musl
CLANG_TARGET_FLAGS_m68k := m68k-linux-gnu
CLANG_TARGET_FLAGS_mips := mipsel-linux-gnu
CLANG_TARGET_FLAGS_powerpc := powerpc64le-linux-gnu
CLANG_TARGET_FLAGS_riscv := riscv64-linux-gnu
CLANG_TARGET_FLAGS_s390 := s390x-linux-gnu
CLANG_TARGET_FLAGS_x86 := x86_64-linux-gnu
CLANG_TARGET_FLAGS := $(CLANG_TARGET_FLAGS_$(ARCH))
ifeq ($(CROSS_COMPILE),)
ifeq ($(CLANG_TARGET_FLAGS),)
$(error Specify CROSS_COMPILE or add '--target=' option to lib.mk
else
CLANG_FLAGS += --target=$(CLANG_TARGET_FLAGS)
endif # CLANG_TARGET_FLAGS
else
CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
endif # CROSS_COMPILE
CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-as
else else
CC := $(CROSS_COMPILE)gcc CC := $(CROSS_COMPILE)gcc
endif endif # LLVM
ifeq (0,$(MAKELEVEL)) ifeq (0,$(MAKELEVEL))
ifeq ($(OUTPUT),) ifeq ($(OUTPUT),)
......
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