2018-04-13 14:06 GMT+09:00 Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>: I forgot to prefix the patch subjects with the version. This series is V3. > [Introduction] > > The motivation of this work is to move the compiler option tests to > Kconfig from Makefile. A number of kernel features require the > compiler support. Enabling such features blindly in Kconfig ends up > with a lot of nasty build-time testing in Makefiles. If a chosen > feature turns out unsupported by the compiler, what the build system > can do is either to disable it (silently!) or to forcibly break the > build, despite Kconfig has let the user to enable it. > > [Major Changes in V3] > > This version looks more like Make. > > - Use = operator instead of 'macro' keyword > to define a user-defined function. > > - 'Recursively expanded variable' is implemented as a side-effect. > A variable is a function with zero argument. > > - Support simply expanded variable which is defined by := operator > > - Support += operator. > Probably, this feature will be useful to accumulate compiler flags. > At least, Clang needs some prerequisite flags such as triplet > to test other compiler flags. > > - Support $(info ...) and $(warning ...) built-in functions, > which were useful while I was debugging this. > > - Add documentation > > - Add unit tests > > - Collect helpers to scripts/Kconfig.include > > [TODO items] > > I have not been able to finish this. Maybe aiming for v4.18-rc1. > > - The text expansion should be able to defer argument expansion. > This is necessary if we want to implement $(if ...) built-in function. > > - Error out recursive expansion of itself. > For example, > X = $(X) > refers itself. > If referenced, the expansion continues eternally. This must be terminated. > > - More compatible behavior? > Kconfig works mostly like Make, but there are naive cases > where the behavior is different. > > [Old Versions] > > V2: https://lkml.org/lkml/2018/2/16/610 > V1: https://lkml.org/lkml/2018/2/16/610 > RFC: https://lkml.org/lkml/2018/2/8/429 > > > > Masahiro Yamada (30): > gcc-plugins: fix build condition of SANCOV plugin > kbuild: remove kbuild cache > kbuild: remove CONFIG_CROSS_COMPILE support > kconfig: reference environment variables directly and remove 'option > env=' > kconfig: remove string expansion in file_lookup() > kconfig: remove string expansion for mainmenu after yyparse() > kconfig: remove sym_expand_string_value() > kconfig: add built-in function support > kconfig: add 'shell' built-in function > kconfig: replace $(UNAME_RELEASE) with function call > kconfig: begin PARAM state only when seeing a command keyword > kconfig: support variable and user-defined function > kconfig: support simply expanded variable > kconfig: support append assignment operator > kconfig: expand lefthand side of assignment statement > kconfig: add 'info' and 'warning' built-in functions > Documentation: kconfig: document a new Kconfig macro language > kconfig: test: test text expansion > kconfig: show compiler version text in the top comment > kconfig: add basic helper macros to scripts/Kconfig.include > stack-protector: test compiler capability in Kconfig and drop AUTO > mode > kconfig: add CC_IS_GCC and GCC_VERSION > kconfig: add CC_IS_CLANG and CLANG_VERSION > gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT > kcov: test compiler capability in Kconfig and correct dependency > gcc-plugins: move GCC version check for PowerPC to Kconfig > gcc-plugins: test plugin support in Kconfig and clean up Makefile > gcc-plugins: allow to enable GCC_PLUGINS for COMPILE_TEST > arm64: move GCC version check for ARCH_SUPPORTS_INT128 to Kconfig > kbuild: test dead code/data elimination support in Kconfig > > Documentation/kbuild/kconfig-language.txt | 8 - > Documentation/kbuild/kconfig-macro-language.txt | 179 +++++++ > Kconfig | 10 +- > MAINTAINERS | 3 +- > Makefile | 113 +--- > arch/Kconfig | 53 +- > arch/arm64/Kconfig | 1 + > arch/arm64/Makefile | 2 - > arch/powerpc/Kconfig | 2 +- > arch/sh/Kconfig | 4 +- > arch/sparc/Kconfig | 4 +- > arch/um/Kconfig.common | 4 - > arch/x86/Kconfig | 15 +- > arch/x86/um/Kconfig | 6 +- > init/Kconfig | 40 +- > kernel/gcov/Kconfig | 17 +- > kernel/gcov/Makefile | 2 - > lib/Kconfig.debug | 11 +- > scripts/Kbuild.include | 101 +--- > scripts/Kconfig.include | 20 + > scripts/Makefile.gcc-plugins | 91 +--- > scripts/Makefile.kcov | 10 +- > scripts/clang-version.sh | 18 +- > scripts/gcc-plugins/Makefile | 1 + > scripts/gcc-x86_32-has-stack-protector.sh | 7 +- > scripts/gcc-x86_64-has-stack-protector.sh | 5 - > scripts/kconfig/confdata.c | 31 +- > scripts/kconfig/kconf_id.c | 1 - > scripts/kconfig/lkc.h | 4 - > scripts/kconfig/lkc_proto.h | 15 +- > scripts/kconfig/menu.c | 3 - > scripts/kconfig/preprocess.c | 594 +++++++++++++++++++++ > scripts/kconfig/symbol.c | 109 ---- > .../kconfig/tests/preprocess/builtin_func/Kconfig | 19 + > .../tests/preprocess/builtin_func/__init__.py | 8 + > .../tests/preprocess/builtin_func/expected_stderr | 4 + > .../tests/preprocess/builtin_func/expected_stdout | 1 + > scripts/kconfig/tests/preprocess/escape/Kconfig | 49 ++ > .../kconfig/tests/preprocess/escape/__init__.py | 9 + > .../tests/preprocess/escape/expected_stderr | 10 + > scripts/kconfig/tests/preprocess/user_func/Kconfig | 19 + > .../kconfig/tests/preprocess/user_func/__init__.py | 7 + > .../tests/preprocess/user_func/expected_stderr | 5 + > scripts/kconfig/tests/preprocess/variable/Kconfig | 39 ++ > .../kconfig/tests/preprocess/variable/__init__.py | 7 + > .../tests/preprocess/variable/expected_stderr | 7 + > scripts/kconfig/util.c | 22 +- > scripts/kconfig/zconf.l | 95 +++- > scripts/kconfig/zconf.y | 48 +- > 49 files changed, 1259 insertions(+), 574 deletions(-) > create mode 100644 Documentation/kbuild/kconfig-macro-language.txt > create mode 100644 scripts/Kconfig.include > create mode 100644 scripts/kconfig/preprocess.c > create mode 100644 scripts/kconfig/tests/preprocess/builtin_func/Kconfig > create mode 100644 scripts/kconfig/tests/preprocess/builtin_func/__init__.py > create mode 100644 scripts/kconfig/tests/preprocess/builtin_func/expected_stderr > create mode 100644 scripts/kconfig/tests/preprocess/builtin_func/expected_stdout > create mode 100644 scripts/kconfig/tests/preprocess/escape/Kconfig > create mode 100644 scripts/kconfig/tests/preprocess/escape/__init__.py > create mode 100644 scripts/kconfig/tests/preprocess/escape/expected_stderr > create mode 100644 scripts/kconfig/tests/preprocess/user_func/Kconfig > create mode 100644 scripts/kconfig/tests/preprocess/user_func/__init__.py > create mode 100644 scripts/kconfig/tests/preprocess/user_func/expected_stderr > create mode 100644 scripts/kconfig/tests/preprocess/variable/Kconfig > create mode 100644 scripts/kconfig/tests/preprocess/variable/__init__.py > create mode 100644 scripts/kconfig/tests/preprocess/variable/expected_stderr > > -- > 2.7.4 > -- Best Regards Masahiro Yamada -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
