kbuild: rename LDFLAGS to KBUILD_LDFLAGS

Commit a0f97e06 ("kbuild: enable 'make CFLAGS=...' to add
additional options to CC") renamed CFLAGS to KBUILD_CFLAGS.

Commit 222d394d ("kbuild: enable 'make AFLAGS=...' to add
additional options to AS") renamed AFLAGS to KBUILD_AFLAGS.

Commit 06c5040c ("kbuild: enable 'make CPPFLAGS=...' to add
additional options to CPP") renamed CPPFLAGS to KBUILD_CPPFLAGS.

For some reason, LDFLAGS was not renamed.

Using a well-known variable like LDFLAGS may result in accidental
override of the variable.

Kbuild generally uses KBUILD_ prefixed variables for the internally
appended options, so here is one more conversion to sanitize the
naming convention.

I did not touch Makefiles under tools/ since the tools build system
is a different world.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>

Makefile

@@ -440,7 +440,7 @@ KBUILD_CFLAGS_KERNEL :=
 KBUILD_AFLAGS_MODULE  := -DMODULE
 KBUILD_CFLAGS_MODULE  := -DMODULE
 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
-LDFLAGS :=
+KBUILD_LDFLAGS :=
 GCC_PLUGINS_CFLAGS :=
 
 export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
@@ -448,7 +448,7 @@ export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
 export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
 export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
 
-export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
+export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
 export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
@@ -1020,7 +1020,7 @@ ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
 
 # Final link of vmlinux with optional arch pass after final link
 cmd_link-vmlinux =                                                 \
-	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
+	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
 	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
 
 vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE

arch/arc/Makefile

@@ -95,7 +95,7 @@ KBUILD_CFLAGS_MODULE	+= -mlong-calls -mno-millicode
 # Finally dump eveything into kernel build system
 KBUILD_CFLAGS	+= $(cflags-y)
 KBUILD_AFLAGS	+= $(KBUILD_CFLAGS)
-LDFLAGS		+= $(ldflags-y)
+KBUILD_LDFLAGS	+= $(ldflags-y)
 
 head-y		:= arch/arc/kernel/head.o
 

arch/arm/Makefile

@@ -43,12 +43,12 @@ ifeq ($(CONFIG_CPU_BIG_ENDIAN),y)
 KBUILD_CPPFLAGS	+= -mbig-endian
 CHECKFLAGS	+= -D__ARMEB__
 AS		+= -EB
-LDFLAGS		+= -EB
+KBUILD_LDFLAGS	+= -EB
 else
 KBUILD_CPPFLAGS	+= -mlittle-endian
 CHECKFLAGS	+= -D__ARMEL__
 AS		+= -EL
-LDFLAGS		+= -EL
+KBUILD_LDFLAGS	+= -EL
 endif
 
 #

arch/arm64/Makefile

@@ -62,14 +62,14 @@ CHECKFLAGS	+= -D__AARCH64EB__
 AS		+= -EB
 # Prefer the baremetal ELF build target, but not all toolchains include
 # it so fall back to the standard linux version if needed.
-LDFLAGS		+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
+KBUILD_LDFLAGS	+= -EB $(call ld-option, -maarch64elfb, -maarch64linuxb)
 UTS_MACHINE	:= aarch64_be
 else
 KBUILD_CPPFLAGS	+= -mlittle-endian
 CHECKFLAGS	+= -D__AARCH64EL__
 AS		+= -EL
 # Same as above, prefer ELF but fall back to linux target if needed.
-LDFLAGS		+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
+KBUILD_LDFLAGS	+= -EL $(call ld-option, -maarch64elf, -maarch64linux)
 UTS_MACHINE	:= aarch64
 endif
 

arch/c6x/Makefile

@@ -23,8 +23,7 @@ ifdef CONFIG_CPU_BIG_ENDIAN
 KBUILD_CFLAGS   += -mbig-endian
 KBUILD_AFLAGS   += -mbig-endian
 LINKFLAGS       += -mbig-endian
-KBUILD_LDFLAGS  += -mbig-endian
-LDFLAGS += -EB
+KBUILD_LDFLAGS  += -mbig-endian -EB
 CHECKFLAGS	+= -D_BIG_ENDIAN
 endif
 

arch/h8300/Makefile

@@ -20,7 +20,7 @@ KBUILD_CFLAGS += -mint32 -fno-builtin
 KBUILD_CFLAGS += -D__linux__
 KBUILD_CFLAGS += -DUTS_SYSNAME=\"uClinux\"
 KBUILD_AFLAGS += $(aflags-y)
-LDFLAGS += $(ldflags-y)
+KBUILD_LDFLAGS += $(ldflags-y)
 
 ifeq ($(CROSS_COMPILE),)
 CROSS_COMPILE := h8300-unknown-linux-

arch/hexagon/Makefile

@@ -22,9 +22,7 @@ ldflags-y += $(call cc-option,-mv${CONFIG_HEXAGON_ARCH_VERSION})
 
 KBUILD_CFLAGS += $(cflags-y)
 KBUILD_AFLAGS += $(aflags-y)
-
-#  no KBUILD_LDFLAGS?
-LDFLAGS += $(ldflags-y)
+KBUILD_LDFLAGS += $(ldflags-y)
 
 # Thread-info register will be r19.  This value is not configureable;
 # it is hard-coded in several files.

arch/m68k/Makefile

@@ -69,7 +69,7 @@ KBUILD_CFLAGS += -D__uClinux__
 KBUILD_AFLAGS += -D__uClinux__
 endif
 
-LDFLAGS := -m m68kelf
+KBUILD_LDFLAGS := -m m68kelf
 KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/m68k/kernel/module.lds
 
 ifdef CONFIG_SUN3

arch/microblaze/Makefile

@@ -40,11 +40,11 @@ CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR) += -mxl-pattern-compare
 ifdef CONFIG_CPU_BIG_ENDIAN
 KBUILD_CFLAGS += -mbig-endian
 KBUILD_AFLAGS += -mbig-endian
-LDFLAGS += -EB
+KBUILD_LDFLAGS += -EB
 else
 KBUILD_CFLAGS += -mlittle-endian
 KBUILD_AFLAGS += -mlittle-endian
-LDFLAGS += -EL
+KBUILD_LDFLAGS += -EL
 endif
 
 CPUFLAGS-1 += $(call cc-option,-mcpu=v$(CPU_VER))

arch/mips/Makefile

@@ -309,7 +309,7 @@ endif
 # instead of .eh_frame so we don't discard them.
 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 
-LDFLAGS			+= -m $(ld-emul)
+KBUILD_LDFLAGS		+= -m $(ld-emul)
 
 ifdef CONFIG_MIPS
 CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \

arch/mips/boot/compressed/Makefile

@@ -92,7 +92,7 @@ UIMAGE_LOADADDR = $(VMLINUZ_LOAD_ADDRESS)
 vmlinuzobjs-y += $(obj)/piggy.o
 
 quiet_cmd_zld = LD      $@
-      cmd_zld = $(LD) $(LDFLAGS) -Ttext $(VMLINUZ_LOAD_ADDRESS) -T $< $(vmlinuzobjs-y) -o $@
+      cmd_zld = $(LD) $(KBUILD_LDFLAGS) -Ttext $(VMLINUZ_LOAD_ADDRESS) -T $< $(vmlinuzobjs-y) -o $@
 quiet_cmd_strip = STRIP	  $@
       cmd_strip = $(STRIP) -s $@
 vmlinuz: $(src)/ld.script $(vmlinuzobjs-y) $(obj)/calc_vmlinuz_load_addr

arch/mips/lasat/image/Makefile

@@ -38,7 +38,7 @@ $(obj)/rom.bin: $(obj)/rom
 
 # Rule to make the bootloader
 $(obj)/rom: $(addprefix $(obj)/,$(OBJECTS))
-	$(LD) $(LDFLAGS) $(LDSCRIPT) -o $@ $^
+	$(LD) $(KBUILD_LDFLAGS) $(LDSCRIPT) -o $@ $^
 
 $(obj)/%.o: $(obj)/%.gz
 	$(LD) -r -o $@ -b binary $<

arch/nds32/Makefile

@@ -33,12 +33,12 @@ endif
 ifdef CONFIG_CPU_LITTLE_ENDIAN
 KBUILD_CFLAGS   += $(call cc-option, -EL)
 KBUILD_AFLAGS   += $(call cc-option, -EL)
-LDFLAGS         += $(call cc-option, -EL)
+KBUILD_LDFLAGS  += $(call cc-option, -EL)
 CHECKFLAGS      += -D__NDS32_EL__
 else
 KBUILD_CFLAGS   += $(call cc-option, -EB)
 KBUILD_AFLAGS   += $(call cc-option, -EB)
-LDFLAGS         += $(call cc-option, -EB)
+KBUILD_LDFLAGS  += $(call cc-option, -EB)
 CHECKFLAGS      += -D__NDS32_EB__
 endif
 

arch/powerpc/Makefile

@@ -76,14 +76,14 @@ endif
 
 ifdef CONFIG_CPU_LITTLE_ENDIAN
 KBUILD_CFLAGS	+= -mlittle-endian
-LDFLAGS		+= -EL
+KBUILD_LDFLAGS	+= -EL
 LDEMULATION	:= lppc
 GNUTARGET	:= powerpcle
 MULTIPLEWORD	:= -mno-multiple
 KBUILD_CFLAGS_MODULE += $(call cc-option,-mno-save-toc-indirect)
 else
 KBUILD_CFLAGS += $(call cc-option,-mbig-endian)
-LDFLAGS		+= -EB
+KBUILD_LDFLAGS	+= -EB
 LDEMULATION	:= ppc
 GNUTARGET	:= powerpc
 MULTIPLEWORD	:= -mmultiple
@@ -108,7 +108,7 @@ aflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= -mlittle-endian
 ifeq ($(HAS_BIARCH),y)
 KBUILD_CFLAGS	+= -m$(BITS)
 KBUILD_AFLAGS	+= -m$(BITS) -Wl,-a$(BITS)
-LDFLAGS		+= -m elf$(BITS)$(LDEMULATION)
+KBUILD_LDFLAGS	+= -m elf$(BITS)$(LDEMULATION)
 KBUILD_ARFLAGS	+= --target=elf$(BITS)-$(GNUTARGET)
 endif
 

arch/riscv/Makefile

@@ -29,7 +29,7 @@ ifeq ($(CONFIG_ARCH_RV64I),y)
 	KBUILD_CFLAGS	+= $(call cc-ifversion, -ge, 0500, -DCONFIG_ARCH_SUPPORTS_INT128)
 
 	KBUILD_MARCH = rv64im
-	LDFLAGS += -melf64lriscv
+	KBUILD_LDFLAGS += -melf64lriscv
 else
 	BITS := 32
 	UTS_MACHINE := riscv32
@@ -37,7 +37,7 @@ else
 	KBUILD_CFLAGS += -mabi=ilp32
 	KBUILD_AFLAGS += -mabi=ilp32
 	KBUILD_MARCH = rv32im
-	LDFLAGS += -melf32lriscv
+	KBUILD_LDFLAGS += -melf32lriscv
 endif
 
 KBUILD_CFLAGS += -Wall

arch/s390/Makefile

@@ -11,7 +11,7 @@
 #
 
 LD_BFD		:= elf64-s390
-LDFLAGS		:= -m elf64_s390
+KBUILD_LDFLAGS	:= -m elf64_s390
 KBUILD_AFLAGS_MODULE += -fPIC
 KBUILD_CFLAGS_MODULE += -fPIC
 KBUILD_AFLAGS	+= -m64

arch/sh/Makefile

@@ -122,11 +122,11 @@ endif
 ifdef CONFIG_CPU_LITTLE_ENDIAN
 ld-bfd			:= elf32-$(UTS_MACHINE)-linux
 LDFLAGS_vmlinux		+= --defsym jiffies=jiffies_64 --oformat $(ld-bfd)
-LDFLAGS			+= -EL
+KBUILD_LDFLAGS		+= -EL
 else
 ld-bfd			:= elf32-$(UTS_MACHINE)big-linux
 LDFLAGS_vmlinux		+= --defsym jiffies=jiffies_64+4 --oformat $(ld-bfd)
-LDFLAGS			+= -EB
+KBUILD_LDFLAGS		+= -EB
 endif
 
 export ld-bfd BITS

arch/sparc/Makefile

@@ -21,7 +21,7 @@ ifeq ($(CONFIG_SPARC32),y)
 #
 
 CHECKFLAGS     += -D__sparc__
-LDFLAGS        := -m elf32_sparc
+KBUILD_LDFLAGS := -m elf32_sparc
 export BITS    := 32
 UTS_MACHINE    := sparc
 
@@ -40,7 +40,7 @@ else
 #
 
 CHECKFLAGS    += -D__sparc__ -D__sparc_v9__ -D__arch64__
-LDFLAGS       := -m elf64_sparc
+KBUILD_LDFLAGS := -m elf64_sparc
 export BITS   := 64
 UTS_MACHINE   := sparc64
 

arch/um/Makefile

@@ -133,7 +133,7 @@ export LDS_ELF_FORMAT := $(ELF_FORMAT)
 # The wrappers will select whether using "malloc" or the kernel allocator.
 LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc
 
-LD_FLAGS_CMDLINE = $(foreach opt,$(LDFLAGS),-Wl,$(opt))
+LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt))
 
 # Used by link-vmlinux.sh which has special support for um link
 export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE)

arch/x86/Makefile

@@ -219,7 +219,7 @@ sha256_ni_instr :=$(call as-instr,sha256msg1 %xmm0$(comma)%xmm1,-DCONFIG_AS_SHA2
 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr) $(avx2_instr) $(avx512_instr) $(sha1_ni_instr) $(sha256_ni_instr)
 
-LDFLAGS := -m elf_$(UTS_MACHINE)
+KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
 
 #
 # The 64-bit kernel must be aligned to 2MB.  Pass -z max-page-size=0x200000 to
@@ -227,7 +227,7 @@ LDFLAGS := -m elf_$(UTS_MACHINE)
 # by the linker.
 #
 ifdef CONFIG_X86_64
-LDFLAGS += $(call ld-option, -z max-page-size=0x200000)
+KBUILD_LDFLAGS += $(call ld-option, -z max-page-size=0x200000)
 endif
 
 # Speed up the build