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arm64: vdso32: Pass '--target' option to clang via VDSO_CAFLAGS 

Directly passing the '--target' option to clang by appending to
COMPATCC does not work if COMPATCC has been specified explicitly as
an argument to Make unless the 'override' directive is used, which is
ugly and different to what is done in the top-level Makefile.

Move the '--target' option for clang out of COMPATCC and into
VDSO_CAFLAGS, where it will be picked up when compiling and assembling
the 32-bit vDSO under clang.

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2019-10-07 12:27:59 +01:00
parent c71e88c437
commit 7424ee2b16
1 changed files with 5 additions and 1 deletions
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6
arch/arm64/kernel/vdso32/Makefile
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@ -10,7 +10,7 @@ include $(srctree)/lib/vdso/Makefile
# Same as cc-*option, but using COMPATCC instead of CC
ifeq ($(CONFIG_CC_IS_CLANG), y)
COMPATCC ?= $(CC) --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%))
COMPATCC ?= $(CC)
else
COMPATCC ?= $(CROSS_COMPILE_COMPAT)gcc
endif
@ -38,6 +38,10 @@ VDSO_CPPFLAGS += $(LINUXINCLUDE)
# Common C and assembly flags
# From top-level Makefile
VDSO_CAFLAGS := $(VDSO_CPPFLAGS)
ifneq ($(shell $(COMPATCC) --version 2>&1 | head -n 1 | grep clang),)
VDSO_CAFLAGS += --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%))
endif
VDSO_CAFLAGS += $(call cc32-option,-fno-PIE)
ifdef CONFIG_DEBUG_INFO
VDSO_CAFLAGS += -g