mirror of git://git.yoctoproject.org/linux-yocto.git synced 2025-10-22 23:13:01 +02:00

Masahiro Yamada b1992c3772 kbuild: use $(src) instead of $(srctree)/$(src) for source directory

Kbuild conventionally uses $(obj)/ for generated files, and $(src)/ for
checked-in source files. It is merely a convention without any functional
difference. In fact, $(obj) and $(src) are exactly the same, as defined
in scripts/Makefile.build:

    src := $(obj)

When the kernel is built in a separate output directory, $(src) does
not accurately reflect the source directory location. While Kbuild
resolves this discrepancy by specifying VPATH=$(srctree) to search for
source files, it does not cover all cases. For example, when adding a
header search path for local headers, -I$(srctree)/$(src) is typically
passed to the compiler.

This introduces inconsistency between upstream and downstream Makefiles
because $(src) is used instead of $(srctree)/$(src) for the latter.

To address this inconsistency, this commit changes the semantics of
$(src) so that it always points to the directory in the source tree.

Going forward, the variables used in Makefiles will have the following
meanings:

  $(obj)     - directory in the object tree
  $(src)     - directory in the source tree  (changed by this commit)
  $(objtree) - the top of the kernel object tree
  $(srctree) - the top of the kernel source tree

Consequently, $(srctree)/$(src) in upstream Makefiles need to be replaced
with $(src).

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>

2024-05-10 04:34:52 +09:00

2.4 KiB

Raw Blame History

arch/arm/boot/Makefile

This file is included by the global makefile so that you can add your own

architecture-specific flags and dependencies.

This file is subject to the terms and conditions of the GNU General Public

License. See the file "COPYING" in the main directory of this archive

for more details.

Copyright (C) 1995-2002 Russell King

OBJCOPYFLAGS :=-O binary -R .comment -S

ZRELADDR == virt_to_phys(PAGE_OFFSET + TEXT_OFFSET)

ifdef CONFIG_PHYS_OFFSET add_hex = $(shell printf 0x%x $$(( $(1) + $(2) )) ) ZRELADDR := $(call add_hex, $(CONFIG_PHYS_OFFSET), $(TEXT_OFFSET)) endif

PHYS_OFFSET := $(CONFIG_PHYS_OFFSET) export ZRELADDR PARAMS_PHYS PHYS_OFFSET

targets := Image zImage xipImage bootpImage uImage

ifeq ($(CONFIG_XIP_KERNEL),y)

cmd_deflate_xip_data = $(CONFIG_SHELL) -c '$(src)/deflate_xip_data.sh $< $@'

ifeq ($(CONFIG_XIP_DEFLATED_DATA),y) quiet_cmd_mkxip = XIPZ $@ cmd_mkxip = $(cmd_objcopy) && $(cmd_deflate_xip_data) else quiet_cmd_mkxip = $(quiet_cmd_objcopy) cmd_mkxip = $(cmd_objcopy) endif

$(obj)/xipImage: vmlinux FORCE $(call if_changed,mkxip) @$(kecho) ' Physical Address of xipImage: $(CONFIG_XIP_PHYS_ADDR)'

$(obj)/Image $(obj)/zImage: FORCE @echo 'Kernel configured for XIP (CONFIG_XIP_KERNEL=y)' @echo 'Only the xipImage target is available in this case' @false

else

$(obj)/xipImage: FORCE @echo 'Kernel not configured for XIP (CONFIG_XIP_KERNEL!=y)' @false

$(obj)/Image: vmlinux FORCE $(call if_changed,objcopy)

$(obj)/compressed/vmlinux: $(obj)/Image FORCE $(Q)$(MAKE) $(build)=$(obj)/compressed $@

$(obj)/zImage: $(obj)/compressed/vmlinux FORCE $(call if_changed,objcopy)

endif

ifneq ($(LOADADDR),) UIMAGE_LOADADDR=$(LOADADDR) else ifeq ($(CONFIG_ZBOOT_ROM),y) UIMAGE_LOADADDR=$(CONFIG_ZBOOT_ROM_TEXT) else UIMAGE_LOADADDR=$(ZRELADDR) endif endif

check_for_multiple_loadaddr =
if [ $(words $(UIMAGE_LOADADDR)) -ne 1 ]; then
echo 'multiple (or no) load addresses: $(UIMAGE_LOADADDR)';
echo 'This is incompatible with uImages';
echo 'Specify LOADADDR on the commandline to build an uImage';
false;
fi

$(obj)/uImage: $(obj)/zImage FORCE @$(check_for_multiple_loadaddr) $(call if_changed,uimage)

$(obj)/bootp/bootp: $(obj)/zImage FORCE $(Q)$(MAKE) $(build)=$(obj)/bootp $@

$(obj)/bootpImage: $(obj)/bootp/bootp FORCE $(call if_changed,objcopy)

subdir- := bootp compressed dts

2.4 KiB Raw Blame History