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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>
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|---|---|---|
| .. | ||
| .gitignore | ||
| Kconfig | ||
| Makefile | ||
| mkutf8data.c | ||
| README.utf8data | ||
| utf8-core.c | ||
| utf8-norm.c | ||
| utf8-selftest.c | ||
| utf8data.c_shipped | ||
| utf8n.h | ||
The utf8data.h file in this directory is generated from the Unicode Character Database for version 12.1.0 of the Unicode standard. The full set of files can be found here: http://www.unicode.org/Public/12.1.0/ucd/ Individual source links: https://www.unicode.org/Public/12.1.0/ucd/CaseFolding.txt https://www.unicode.org/Public/12.1.0/ucd/DerivedAge.txt https://www.unicode.org/Public/12.1.0/ucd/extracted/DerivedCombiningClass.txt https://www.unicode.org/Public/12.1.0/ucd/DerivedCoreProperties.txt https://www.unicode.org/Public/12.1.0/ucd/NormalizationCorrections.txt https://www.unicode.org/Public/12.1.0/ucd/NormalizationTest.txt https://www.unicode.org/Public/12.1.0/ucd/UnicodeData.txt md5sums (verify by running "md5sum -c README.utf8data"): 900e76da1d822a160fd6b8c0b1d70094 CaseFolding.txt 131256380bff4fea8ad4a851616f2f10 DerivedAge.txt e731a4089b30002144e107e3d6f8d1fa DerivedCombiningClass.txt a47c9fbd7ff92a9b261ba9831e68778a DerivedCoreProperties.txt fcab6dad15e440879d92f315978f93d3 NormalizationCorrections.txt f9ff1c55a60decf436100f791b44aa98 NormalizationTest.txt 755f6af699f8c8d2d958da411f78f6c6 UnicodeData.txt sha1sums (verify by running "sha1sum -c README.utf8data"): dc9245f6803c4ac99555c361f5052e0b13eb779b CaseFolding.txt 3281104f237184cdb5d869e86eb8573678ada7da DerivedAge.txt 2f5f995ccb96e0fa84b15151b35d5e2681535175 DerivedCombiningClass.txt 5b8698a3fcd5018e1987f296b02e2c17e696415e DerivedCoreProperties.txt cd83935fbc012345d8792d2c704f69497e753835 NormalizationCorrections.txt ea419aae505b337b0d99a83fa83fe58ddff7c19f NormalizationTest.txt dc973c0fc93d6f09d9ab9f70d1c9f89c447f0526 UnicodeData.txt To update to the newer version of the Unicode standard, the latest released version of the UCD can be found here: http://www.unicode.org/Public/UCD/latest/ Then, build under fs/unicode/ with REGENERATE_UTF8DATA=1: make REGENERATE_UTF8DATA=1 fs/unicode/ After sanity checking the newly generated utf8data.h file (the version generated from the 12.1.0 UCD should be 4,109 lines long, and have a total size of 324k) and/or comparing it with the older version of utf8data.h_shipped, rename it to utf8data.h_shipped. If you are a kernel developer updating to a newer version of the Unicode Character Database, please update this README.utf8data file with the version of the UCD that was used, the md5sum and sha1sums of the *.txt files, before checking in the new versions of the utf8data.h and README.utf8data files.