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When clang's -Qunused-arguments is dropped from KBUILD_CPPFLAGS, it warns while building objects in the purgatory folder: clang-16: error: argument unused during compilation: '-MD' [-Werror,-Wunused-command-line-argument] '-MMD' is always passed to the preprocessor via c_flags, even when KBUILD_CFLAGS is overridden in a folder, so clang complains the addition of '-MD' will be unused. Remove '-MD' to clear up this warning, as it is unnecessary with '-MMD'. Additionally, '-c' is also unnecessary, remove it while in the area. Signed-off-by: Nathan Chancellor <nathan@kernel.org> Acked-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Sven Schnelle <svens@linux.ibm.com> Tested-by: Linux Kernel Functional Testing <lkft@linaro.org> Tested-by: Anders Roxell <anders.roxell@linaro.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
54 lines
1.8 KiB
Makefile
54 lines
1.8 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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OBJECT_FILES_NON_STANDARD := y
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purgatory-y := head.o purgatory.o string.o sha256.o mem.o
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targets += $(purgatory-y) purgatory.lds purgatory purgatory.chk purgatory.ro
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PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
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$(obj)/sha256.o: $(srctree)/lib/crypto/sha256.c FORCE
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$(call if_changed_rule,cc_o_c)
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CFLAGS_sha256.o := -D__DISABLE_EXPORTS
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$(obj)/mem.o: $(srctree)/arch/s390/lib/mem.S FORCE
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$(call if_changed_rule,as_o_S)
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KCOV_INSTRUMENT := n
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GCOV_PROFILE := n
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UBSAN_SANITIZE := n
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KASAN_SANITIZE := n
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KCSAN_SANITIZE := n
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KBUILD_CFLAGS := -fno-strict-aliasing -Wall -Wstrict-prototypes
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KBUILD_CFLAGS += -Wno-pointer-sign -Wno-sign-compare
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KBUILD_CFLAGS += -fno-zero-initialized-in-bss -fno-builtin -ffreestanding
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KBUILD_CFLAGS += -Os -m64 -msoft-float -fno-common
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KBUILD_CFLAGS += -fno-stack-protector
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KBUILD_CFLAGS += $(CLANG_FLAGS)
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KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
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KBUILD_AFLAGS := $(filter-out -DCC_USING_EXPOLINE,$(KBUILD_AFLAGS))
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# Since we link purgatory with -r unresolved symbols are not checked, so we
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# also link a purgatory.chk binary without -r to check for unresolved symbols.
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PURGATORY_LDFLAGS := -nostdlib -z nodefaultlib
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LDFLAGS_purgatory := -r $(PURGATORY_LDFLAGS) -T
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LDFLAGS_purgatory.chk := -e purgatory_start $(PURGATORY_LDFLAGS)
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$(obj)/purgatory: $(obj)/purgatory.lds $(PURGATORY_OBJS) FORCE
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$(call if_changed,ld)
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$(obj)/purgatory.chk: $(obj)/purgatory FORCE
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$(call if_changed,ld)
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OBJCOPYFLAGS_purgatory.ro := -O elf64-s390
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OBJCOPYFLAGS_purgatory.ro += --remove-section='*debug*'
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OBJCOPYFLAGS_purgatory.ro += --remove-section='.comment'
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OBJCOPYFLAGS_purgatory.ro += --remove-section='.note.*'
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$(obj)/purgatory.ro: $(obj)/purgatory $(obj)/purgatory.chk FORCE
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$(call if_changed,objcopy)
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$(obj)/kexec-purgatory.o: $(obj)/purgatory.ro
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obj-y += kexec-purgatory.o
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