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

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

tools/testing/selftests/lib.mk

+23 −2
Original line number Diff line number Diff line
@@ -7,10 +7,31 @@ else ifneq ($(filter -%,$(LLVM)),) 
LLVM_SUFFIX := $(LLVM)

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

CC := $(CROSS_COMPILE)gcc

endif

endif # LLVM



ifeq (0,$(MAKELEVEL))

    ifeq ($(OUTPUT),)