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arm64: vdso32: Don't use KBUILD_CPPFLAGS unconditionally 

KBUILD_CPPFLAGS is defined differently depending on whether the main
compiler is clang or not. This means that it is not possible to build
the compat vDSO with GCC if the rest of the kernel is built with clang.

Define VDSO_CPPFLAGS directly to break this dependency and allow a clang
kernel to build a compat vDSO with GCC:

  $ make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- \
    CROSS_COMPILE_COMPAT=arm-linux-gnueabihf- CC=clang \
    COMPATCC=arm-linux-gnueabihf-gcc

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2019-10-04 15:44:45 +01:00
parent bcaf9b57e4
commit c71e88c437
1 changed files with 2 additions and 4 deletions
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6
arch/arm64/kernel/vdso32/Makefile
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@ -31,11 +31,9 @@ cc32-as-instr = $(call try-run,\
# arm64 one.
# As a result we set our own flags here.
# From top-level Makefile
# NOSTDINC_FLAGS
VDSO_CPPFLAGS := -nostdinc -isystem $(shell $(COMPATCC) -print-file-name=include)
# KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-level Makefile
VDSO_CPPFLAGS := -D__KERNEL__ -nostdinc -isystem $(shell $(COMPATCC) -print-file-name=include)
VDSO_CPPFLAGS += $(LINUXINCLUDE)
VDSO_CPPFLAGS += $(KBUILD_CPPFLAGS)
# Common C and assembly flags
# From top-level Makefile