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b1992c3772
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 $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
58 lines
1.5 KiB
Makefile
58 lines
1.5 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# linux/arch/arm/tools/Makefile
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#
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# Copyright (C) 2001 Russell King
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#
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gen := arch/$(ARCH)/include/generated
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kapi := $(gen)/asm
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uapi := $(gen)/uapi/asm
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syshdr := $(srctree)/scripts/syscallhdr.sh
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sysnr := $(src)/syscallnr.sh
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systbl := $(srctree)/scripts/syscalltbl.sh
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syscall := $(src)/syscall.tbl
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gen-y := $(gen)/calls-oabi.S
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gen-y += $(gen)/calls-eabi.S
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kapi-hdrs-y := $(kapi)/unistd-nr.h
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kapi-hdrs-y += $(kapi)/mach-types.h
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uapi-hdrs-y += $(uapi)/unistd-oabi.h
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uapi-hdrs-y += $(uapi)/unistd-eabi.h
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targets += $(addprefix ../../../,$(gen-y) $(kapi-hdrs-y) $(uapi-hdrs-y))
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PHONY += kapi uapi
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kapi: $(kapi-hdrs-y) $(gen-y)
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uapi: $(uapi-hdrs-y)
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# Create output directory if not already present
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$(shell mkdir -p $(kapi) $(uapi))
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quiet_cmd_gen_mach = GEN $@
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cmd_gen_mach = $(AWK) -f $(real-prereqs) > $@
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$(kapi)/mach-types.h: $(src)/gen-mach-types $(src)/mach-types FORCE
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$(call if_changed,gen_mach)
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quiet_cmd_syshdr = SYSHDR $@
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cmd_syshdr = $(CONFIG_SHELL) $(syshdr) --abis common,$* \
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--offset __NR_SYSCALL_BASE $< $@
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quiet_cmd_systbl = SYSTBL $@
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cmd_systbl = $(CONFIG_SHELL) $(systbl) --abis common,$* $< $@
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quiet_cmd_sysnr = SYSNR $@
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cmd_sysnr = $(CONFIG_SHELL) $(sysnr) $< $@
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$(uapi)/unistd-%.h: $(syscall) $(syshdr) FORCE
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$(call if_changed,syshdr)
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$(kapi)/unistd-nr.h: $(syscall) $(sysnr) FORCE
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$(call if_changed,sysnr)
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$(gen)/calls-%.S: $(syscall) $(systbl) FORCE
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$(call if_changed,systbl)
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