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Date: Sat, 17 Feb 2018 03:38:28 +0900
From: Masahiro Yamada <yamada.masahiro@...ionext.com>
To: linux-kbuild@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Arnd Bergmann <arnd@...db.de>, Kees Cook <keescook@...omium.org>,
Randy Dunlap <rdunlap@...radead.org>,
Ulf Magnusson <ulfalizer@...il.com>, Sam Ravnborg <sam@...nborg.org>,
Michal Marek <michal.lkml@...kovi.net>,
Masahiro Yamada <yamada.masahiro@...ionext.com>,
Peter Oberparleiter <oberpar@...ux.vnet.ibm.com>,
kernel-hardening@...ts.openwall.com, Jonathan Corbet <corbet@....net>,
sparclinux@...r.kernel.org, linux-sh@...r.kernel.org, x86@...nel.org,
Thomas Gleixner <tglx@...utronix.de>, Rich Felker <dalias@...c.org>,
Jeff Dike <jdike@...toit.com>, "H. Peter Anvin" <hpa@...or.com>,
user-mode-linux-devel@...ts.sourceforge.net,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
linuxppc-dev@...ts.ozlabs.org, Paul Mackerras <paulus@...ba.org>,
user-mode-linux-user@...ts.sourceforge.net,
Ingo Molnar <mingo@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Michael Ellerman <mpe@...erman.id.au>, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, Richard Weinberger <richard@....at>,
Emese Revfy <re.emese@...il.com>
Subject: [PATCH 00/23] kconfig: move compiler capability tests to Kconfig
I brushed up the implementation in this version.
In the previous RFC, CC_HAS_ was described by using 'option shell=',
like this:
config CC_HAS_STACKPROTECTOR
bool
option shell="$CC -Werror -fstack-protector -c -x c /dev/null"
After I thought a bit more, the following syntax is more grammatical,
and flexible.
config CC_HAS_STACKPROTECTOR
bool
default $(shell $CC -Werror -fstack-protector -c -x c /dev/null)
This version supports cc-option, so it can be written as:
config CC_HAS_STACKPROTECTOR
bool
default $(cc-option -fstack-protector)
To support this in a clean way, I introduced a new concept 'function'
like we see in Makefiles.
$(shell ...) is a built-in function. $(cc-option ...) is implemented
as macro (user-defined function).
I also try cleaning of stack-protector, gcc-plugins since the Makefile
is so dirty.
Current limitations:
Dependency on outside scripts.
For example, scripts/gcc-x86_64-has-stack-protecter.sh is run from
Kconfig. When the shell script is updated, should Kconfig be re-run
automatically?
Inter-option dependency:
$(call cc-option,...) in Makefile accumulates added options to
KBUILD_CFLAGS, but it is difficult to do it in Kconfig.
If a compiler option check is dependent on another option,
this is a difficult case. Let's see how significant it is.
Functions are evaluated statically:
Functions are only expanded when parsing the Kconfig. So, it can
not refelect user configuration. If this is required, $(shell )
must be dynamically re-calculated depending on other symbols.
But, this is difficult, and may cause performance issue.
Masahiro Yamada (22):
kbuild: remove kbuild cache
kbuild: remove CONFIG_CROSS_COMPILE support
kconfig: add xstrdup() helper
kconfig: set SYMBOL_AUTO to the symbol marked with defconfig_list
kconfig: move and rename sym_expand_string_value()
kconfig: reference environments directly and remove 'option env='
syntax
kconfig: add function support and implement 'shell' function
kconfig: add 'macro' keyword to support user-defined function
kconfig: add 'cc-option' macro
stack-protector: test compiler capability in Kconfig and drop AUTO
mode
kconfig: add 'shell-stdout' function
kconfig: replace $UNAME_RELEASE with function call
kconfig: expand environments/functions in (main)menu, comment, prompt
kconfig: show compiler version text in the top comment
kconfig: add CC_IS_GCC and GCC_VERSION
kconfig: add CC_IS_CLANG and CLANG_VERSION
gcov: remove CONFIG_GCOV_FORMAT_AUTODETECT
kcov: imply GCC_PLUGINS and GCC_PLUGIN_SANCOV instead of select'ing
them
gcc-plugins: always build plugins with C++
gcc-plugins: move GCC version check for PowerPC to Kconfig
gcc-plugins: test GCC plugin support in Kconfig
gcc-plugins: enable GCC_PLUGINS for COMPILE_TEST
Sami Tolvanen (1):
kbuild: add clang-version.sh
Documentation/kbuild/kconfig-language.txt | 8 -
Kconfig | 4 +-
Makefile | 103 ++----------
arch/Kconfig | 43 +++--
arch/powerpc/Kconfig | 2 +-
arch/sh/Kconfig | 4 +-
arch/sparc/Kconfig | 4 +-
arch/tile/Kconfig | 2 +-
arch/um/Kconfig.common | 4 -
arch/x86/Kconfig | 12 +-
arch/x86/um/Kconfig | 4 +-
init/Kconfig | 44 +++---
kernel/gcov/Kconfig | 18 +--
kernel/gcov/Makefile | 2 -
lib/Kconfig.debug | 7 +-
scripts/Kbuild.include | 101 ++----------
scripts/Makefile.gcc-plugins | 95 ++++-------
scripts/clang-version.sh | 31 ++++
scripts/gcc-plugin.sh | 37 +----
scripts/gcc-plugins/Makefile | 15 +-
scripts/gcc-x86_32-has-stack-protector.sh | 7 +-
scripts/gcc-x86_64-has-stack-protector.sh | 5 -
scripts/kconfig/confdata.c | 33 +---
scripts/kconfig/function.c | 251 ++++++++++++++++++++++++++++++
scripts/kconfig/kconf_id.c | 2 +-
scripts/kconfig/kxgettext.c | 2 +-
scripts/kconfig/lkc.h | 6 +-
scripts/kconfig/lkc_proto.h | 7 +-
scripts/kconfig/menu.c | 6 +-
scripts/kconfig/symbol.c | 139 +++--------------
scripts/kconfig/util.c | 186 ++++++++++++++++++++--
scripts/kconfig/zconf.l | 40 ++++-
scripts/kconfig/zconf.y | 48 +++---
33 files changed, 687 insertions(+), 585 deletions(-)
create mode 100755 scripts/clang-version.sh
create mode 100644 scripts/kconfig/function.c
--
2.7.4
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