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https://github.com/torvalds/linux
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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 $(src).
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
42 lines
1 KiB
Makefile
42 lines
1 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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ifneq ($(CONFIG_UNICODE),)
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obj-y += unicode.o
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endif
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obj-$(CONFIG_UNICODE) += utf8data.o
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obj-$(CONFIG_UNICODE_NORMALIZATION_SELFTEST) += utf8-selftest.o
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unicode-y := utf8-norm.o utf8-core.o
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$(obj)/utf8-data.o: $(obj)/utf8data.c
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# In the normal build, the checked-in utf8data.c is just shipped.
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#
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# To generate utf8data.c from UCD, put *.txt files in this directory
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# and pass REGENERATE_UTF8DATA=1 from the command line.
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ifdef REGENERATE_UTF8DATA
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quiet_cmd_utf8data = GEN $@
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cmd_utf8data = $< \
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-a $(src)/DerivedAge.txt \
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-c $(src)/DerivedCombiningClass.txt \
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-p $(src)/DerivedCoreProperties.txt \
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-d $(src)/UnicodeData.txt \
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-f $(src)/CaseFolding.txt \
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-n $(src)/NormalizationCorrections.txt \
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-t $(src)/NormalizationTest.txt \
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-o $@
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$(obj)/utf8data.c: $(obj)/mkutf8data $(filter %.txt, $(cmd_utf8data)) FORCE
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$(call if_changed,utf8data)
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else
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$(obj)/utf8data.c: $(src)/utf8data.c_shipped FORCE
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$(call if_changed,copy)
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endif
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targets += utf8data.c
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hostprogs += mkutf8data
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