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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 $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
52 lines
1.4 KiB
Makefile
52 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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kapi := arch/$(SRCARCH)/include/generated/asm
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uapi := arch/$(SRCARCH)/include/generated/uapi/asm
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$(shell mkdir -p $(uapi) $(kapi))
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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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quiet_cmd_syshdr = SYSHDR $@
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cmd_syshdr = $(CONFIG_SHELL) $(syshdr) --offset __NR_Linux $< $@
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quiet_cmd_sysnr = SYSNR $@
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cmd_sysnr = $(CONFIG_SHELL) '$(sysnr)' '$<' '$@' \
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'$(sysnr_abis_$(basetarget))' \
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'$(sysnr_pfx_$(basetarget))'
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quiet_cmd_systbl = SYSTBL $@
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cmd_systbl = $(CONFIG_SHELL) $(systbl) $< $@
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$(uapi)/unistd_%.h: $(src)/syscall_%.tbl $(syshdr) FORCE
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$(call if_changed,syshdr)
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sysnr_pfx_unistd_nr_n32 := N32
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sysnr_pfx_unistd_nr_n64 := 64
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sysnr_pfx_unistd_nr_o32 := O32
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$(kapi)/unistd_nr_%.h: $(src)/syscall_%.tbl $(sysnr) FORCE
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$(call if_changed,sysnr)
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$(kapi)/syscall_table_%.h: $(src)/syscall_%.tbl $(systbl) FORCE
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$(call if_changed,systbl)
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uapisyshdr-y += unistd_n32.h \
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unistd_n64.h \
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unistd_o32.h
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kapisyshdr-y += syscall_table_n32.h \
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syscall_table_n64.h \
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syscall_table_o32.h \
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unistd_nr_n32.h \
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unistd_nr_n64.h \
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unistd_nr_o32.h
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uapisyshdr-y := $(addprefix $(uapi)/, $(uapisyshdr-y))
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kapisyshdr-y := $(addprefix $(kapi)/, $(kapisyshdr-y))
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targets += $(addprefix ../../../../, $(uapisyshdr-y) $(kapisyshdr-y))
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PHONY += all
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all: $(uapisyshdr-y) $(kapisyshdr-y)
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@:
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