Stephen Boyd
48522289bf
kbuild: Check for unknown options with cc-option usage in Kconfig and clang ...
[ Upstream commit e8de12fb7cde2c85bc31097cd098da79a4818305 ]
If the particular version of clang a user has doesn't enable
-Werror=unknown-warning-option by default, even though it is the
default[1], then make sure to pass the option to the Kconfig cc-option
command so that testing options from Kconfig files works properly.
Otherwise, depending on the default values setup in the clang toolchain
we will silently assume options such as -Wmaybe-uninitialized are
supported by clang, when they really aren't.
A compilation issue only started happening for me once commit
589834b3a009 ("kbuild: Add -Werror=unknown-warning-option to
CLANG_FLAGS") was applied on top of commit b303c6df80c9 ("kbuild:
compute false-positive -Wmaybe-uninitialized cases in Kconfig"). This
leads kbuild to try and test for the existence of the
-Wmaybe-uninitialized flag with the cc-option command in
scripts/Kconfig.include, and it doesn't see an error returned from the
option test so it sets the config value to Y. Then the Makefile tries to
pass the unknown option on the command line and
-Werror=unknown-warning-option catches the invalid option and breaks the
build. Before commit 589834b3a009 ("kbuild: Add
-Werror=unknown-warning-option to CLANG_FLAGS") the build works fine,
but any cc-option test of a warning option in Kconfig files silently
evaluates to true, even if the warning option flag isn't supported on
clang.
Note: This doesn't change cc-option usages in Makefiles because those
use a different rule that includes KBUILD_CFLAGS by default (see the
__cc-option command in scripts/Kbuild.incluide). The KBUILD_CFLAGS
variable already has the -Werror=unknown-warning-option flag set. Thanks
to Doug for pointing out the different rule.
[1] https://clang.llvm.org/docs/DiagnosticsReference.html#wunknown-warning-option
Cc: Peter Smith <peter.smith@linaro.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-08-25 10:47:56 +02:00
kbuild: move bin2c back to scripts/ from scripts/basic/
2018-07-18 01:18:05 +09:00
fs: stream_open - opener for stream-like files so that read and write can run simultaneously without deadlock
2019-05-08 07:21:51 +02:00
scripts/dtc: consolidate include path options in Makefile
2018-08-22 23:21:36 +09:00
gcc-plugins: Fix build failures under Darwin host
2019-06-09 09:17:22 +02:00
scripts/gdb: fix lx-version string output
2019-02-12 19:47:20 +01:00
genksyms: Teach parser about 128-bit built-in types
2019-07-31 07:27:02 +02:00
kconfig: Clear "written" flag to avoid data loss
2019-08-06 19:06:53 +02:00
Fix dead URLs to ftp.kernel.org
2017-03-28 16:16:52 +02:00
modpost: file2alias: check prototype of handler
2019-04-27 09:36:39 +02:00
kbuild: deb-pkg: fix bindeb-pkg breakage when O= is used
2019-04-17 08:38:45 +02:00
selinux: use kernel linux/socket.h for genheaders and mdp
2019-05-04 09:20:10 +02:00
scripts: Add Python 3 support to tracing/draw_functrace.py
2018-07-29 11:08:38 +09:00
kbuild: move bin2c back to scripts/ from scripts/basic/
2018-07-18 01:18:05 +09:00
kbuild: remove CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
2018-05-17 22:44:57 +09:00
kbuild: rename *-asn1.[ch] to *.asn1.[ch]
2018-04-07 19:04:02 +09:00
kbuild: move bin2c back to scripts/ from scripts/basic/
2018-07-18 01:18:05 +09:00
syscalls/core, syscalls/x86: Clean up compat syscall stub naming convention
2018-04-09 16:47:28 +02:00
scripts: Switch to more portable Perl shebang
2017-05-14 11:20:44 +09:00
bpf: change eBPF helper doc parsing script to allow for smaller indent
2018-05-17 17:34:43 +02:00
bpfilter: check compiler capability in Kconfig
2018-06-28 13:36:39 +09:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
checkkconfigsymbols.py: support Kconfig's 'imply' statement
2017-02-03 11:49:06 +01:00
checkpatch: add __ro_after_init to known $Attribute
2018-09-04 16:45:02 -07:00
scripts/checkstack.pl: Fix arm64 wrong or unknown architecture
2019-06-25 11:35:58 +08:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kbuild: Add a space after ! to prevent parsing as file pattern
2018-08-22 23:21:40 +09:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
coccicheck: return proper error code on fail
2018-08-14 08:58:56 +09:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
const_structs.checkpatch: add frequently used from Julia Lawall's list
2016-10-11 15:06:30 -07:00
scripts/decode_stacktrace.sh: prefix addr2line with $CROSS_COMPILE
2019-07-10 09:53:39 +02:00
scripts/decodecode: make it take multiline Code line
2018-01-31 17:18:34 -08:00
kbuild: modules_install: warn when missing System.map file
2018-09-09 09:14:07 +09:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
scripts/documentation-file-ref-check: ignore sched-pelt false positive
2018-07-02 11:25:00 -06:00
scripts: Switch to more portable Perl shebang
2017-05-14 11:20:44 +09:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
scripts: teach extract-vmlinux about LZ4 and ZSTD
2018-07-08 09:32:32 +09:00
MAINTAINERS & files: Canonize the e-mails I use at files
2018-05-04 06:21:06 -04:00
scripts/faddr2line: make the new code listing format optional
2018-06-05 09:04:37 -07:00
kbuild: Use ls(1) instead of stat(1) to obtain file size
2018-03-26 02:01:24 +09:00
scripts: Add a script to find unused documentation
2017-10-23 08:01:37 -06:00
jump_label: move 'asm goto' support test to Kconfig
2019-06-04 08:02:34 +02:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
stack-protector: test compiler capability in Kconfig and drop AUTO mode
2018-06-08 18:56:00 +09:00
stack-protector: Fix test with 32-bit userland and CONFIG_64BIT=y
2018-06-25 23:21:13 +09:00
scripts: Switch to more portable Perl shebang
2017-05-14 11:20:44 +09:00
get_maintainer: allow option --mpath <directory> to read all files in <directory>
2018-08-22 10:52:48 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kbuild: Improve portability of some sed invocations
2018-03-26 02:01:18 +09:00
kallsyms: exclude kasan local symbols on s390
2019-07-31 07:27:05 +02:00
x86/build: Remove jump label quirk for GCC older than 4.5.2
2018-08-30 11:37:08 +02:00
kbuild: Check for unknown options with cc-option usage in Kconfig and clang
2019-08-25 10:47:56 +02:00
scripts/kernel-doc: Escape all literal braces in regexes
2018-08-06 13:36:20 -06:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
leaking_addresses: check if file name contains address
2018-04-07 08:50:34 +10:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
kbuild: rename LDFLAGS to KBUILD_LDFLAGS
2018-08-24 08:22:08 +09:00
kbuild: Rename HOST_LOADLIBES to KBUILD_HOSTLDLIBS
2018-07-18 01:18:05 +09:00
Kbuild updates for v4.15
2017-11-17 17:45:29 -08:00
x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support
2018-12-05 19:32:01 +01:00
kbuild: remove deprecated host-progs variable
2018-08-09 21:51:17 +09:00
DeviceTree for 4.15:
2017-11-14 18:25:40 -08:00
Kbuild: suppress packed-not-aligned warning for default setting only
2018-01-18 09:37:53 +09:00
gcc-plugins: Regularize Makefile.gcc-plugins
2018-07-24 16:11:07 -07:00
Kbuild updates for v4.15
2017-11-17 17:45:29 -08:00
kbuild: Rename HOST_LOADLIBES to KBUILD_HOSTLDLIBS
2018-07-18 01:18:05 +09:00
kasan: rework Kconfig settings
2018-02-06 18:32:47 -08:00
kcov: test compiler capability in Kconfig and correct dependency
2018-06-11 09:14:08 +09:00
kbuild: rename LDFLAGS to KBUILD_LDFLAGS
2018-08-24 08:22:08 +09:00
Kbuild: Makefile.modbuiltin: include auto.conf and tristate.conf mandatory
2018-08-03 00:47:00 +09:00
kbuild: remove duplicated comments about PHONY
2018-07-06 22:04:03 +09:00
kbuild: modpost: handle KBUILD_EXTRA_SYMBOLS only for external modules
2019-08-25 10:47:55 +02:00
kbuild: remove duplicated comments about PHONY
2018-07-06 22:04:03 +09:00
lib/ubsan: remove null-pointer checks
2018-08-10 20:19:58 -07:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
scripts: Switch to more portable Perl shebang
2017-05-14 11:20:44 +09:00
Kbuild updates for v4.15
2017-11-17 17:45:29 -08:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
module: set .init_array alignment to 8
2017-03-13 09:40:28 -07:00
kbuild: rename built-in.o to built-in.a
2018-03-26 02:01:19 +09:00
scripts: objdiff: Ignore debug info when comparing
2017-03-11 11:13:38 +09:00
parse-maintainers: add ability to specify filenames
2017-11-17 16:10:01 -08:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
scripts: Fixed printf format mismatch
2018-05-29 22:04:12 +09:00
recordmcount: Fix spurious mcount entries on powerpc
2019-07-31 07:27:03 +02:00
nds32/ftrace: Add RECORD_MCOUNT support
2018-09-04 14:45:18 +08:00
Revert "scripts/setlocalversion: git: Make -dirty check more robust"
2018-11-27 16:13:08 +01:00
sign-file: fix build error in sign-file.c with libressl
2017-02-10 12:43:47 +11:00
powerpc: Build-time sort the exception table
2016-11-14 11:11:51 +11:00
scripts/spdxcheck.py: always open files in binary mode
2018-12-19 19:19:50 +01:00
treewide: correct "differenciate" and "instanciate" typos
2018-08-23 18:48:43 -07:00
scripts/sphinx-pre-install: fix script for RHEL/CentOS
2019-08-16 10:12:44 +02:00
MAINTAINERS & files: Canonize the e-mails I use at files
2018-05-04 06:21:06 -04:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
selftests: add headers_install to lib.mk
2018-09-05 08:12:09 -06:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2018-07-18 19:32:54 -07:00
unifdef: use memcpy instead of strncpy
2018-12-08 12:59:06 +01:00
ver_linux: Do not check for ver_linux pattern in version function
2018-07-07 17:44:52 +02:00
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
48522289bf