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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 $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
46 lines
1.1 KiB
Makefile
46 lines
1.1 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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gen := arch/$(ARCH)/include/generated
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kapi := $(gen)/asm
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uapi := $(gen)/uapi/asm
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syscall := $(src)/syscall.tbl
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systbl := $(src)/syscalltbl
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gen-y := $(kapi)/syscall_table.h
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kapi-hdrs-y := $(kapi)/unistd_nr.h
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uapi-hdrs-y := $(uapi)/unistd_32.h
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uapi-hdrs-y += $(uapi)/unistd_64.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: $(gen-y) $(kapi-hdrs-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 $(uapi) $(kapi))
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filechk_syshdr = $(CONFIG_SHELL) '$(systbl)' -H -a $(syshdr_abi_$(basetarget)) -f "$2" < $<
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filechk_sysnr = $(CONFIG_SHELL) '$(systbl)' -N -a $(sysnr_abi_$(basetarget)) < $<
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filechk_syscalls = $(CONFIG_SHELL) '$(systbl)' -S < $<
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syshdr_abi_unistd_32 := common,32
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$(uapi)/unistd_32.h: $(syscall) FORCE
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$(call filechk,syshdr,$@)
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syshdr_abi_unistd_64 := common,64
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$(uapi)/unistd_64.h: $(syscall) FORCE
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$(call filechk,syshdr,$@)
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$(kapi)/syscall_table.h: $(syscall) FORCE
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$(call filechk,syscalls)
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sysnr_abi_unistd_nr := common,32,64
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$(kapi)/unistd_nr.h: $(syscall) FORCE
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$(call filechk,sysnr)
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