Stephen Boyd 48522289bf kbuild: Check for unknown options with cc-option usage in Kconfig and clang ... [ Upstream commit e8de12fb7c ] 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 589834b3a0 ("kbuild: Add -Werror=unknown-warning-option to CLANG_FLAGS") was applied on top of commit b303c6df80 ("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 589834b3a0 ("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
..
basic	kbuild: move bin2c back to scripts/ from scripts/basic/	2018-07-18 01:18:05 +09:00
coccinelle	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
dtc	scripts/dtc: consolidate include path options in Makefile	2018-08-22 23:21:36 +09:00
gcc-plugins	gcc-plugins: Fix build failures under Darwin host	2019-06-09 09:17:22 +02:00
gdb	scripts/gdb: fix lx-version string output	2019-02-12 19:47:20 +01:00
genksyms	genksyms: Teach parser about 128-bit built-in types	2019-07-31 07:27:02 +02:00
kconfig	kconfig: Clear "written" flag to avoid data loss	2019-08-06 19:06:53 +02:00
ksymoops
mod	modpost: file2alias: check prototype of handler	2019-04-27 09:36:39 +02:00
package	kbuild: deb-pkg: fix bindeb-pkg breakage when O= is used	2019-04-17 08:38:45 +02:00
selinux	selinux: use kernel linux/socket.h for genheaders and mdp	2019-05-04 09:20:10 +02:00
tracing	scripts: Add Python 3 support to tracing/draw_functrace.py	2018-07-29 11:08:38 +09:00
.gitignore	kbuild: move bin2c back to scripts/ from scripts/basic/	2018-07-18 01:18:05 +09:00
adjust_autoksyms.sh	kbuild: remove CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX	2018-05-17 22:44:57 +09:00
asn1_compiler.c	kbuild: rename *-asn1.[ch] to *.asn1.[ch]	2018-04-07 19:04:02 +09:00
bin2c.c	kbuild: move bin2c back to scripts/ from scripts/basic/	2018-07-18 01:18:05 +09:00
bloat-o-meter	syscalls/core, syscalls/x86: Clean up compat syscall stub naming convention	2018-04-09 16:47:28 +02:00
bootgraph.pl
bpf_helpers_doc.py	bpf: change eBPF helper doc parsing script to allow for smaller indent	2018-05-17 17:34:43 +02:00
cc-can-link.sh	bpfilter: check compiler capability in Kconfig	2018-06-28 13:36:39 +09:00
check_00index.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
check_extable.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
checkincludes.pl	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
checkkconfigsymbols.py
checkpatch.pl	checkpatch: add __ro_after_init to known $Attribute	2018-09-04 16:45:02 -07:00
checkstack.pl	scripts/checkstack.pl: Fix arm64 wrong or unknown architecture	2019-06-25 11:35:58 +08:00
checksyscalls.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
checkversion.pl	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
clang-version.sh	kbuild: Add a space after ! to prevent parsing as file pattern	2018-08-22 23:21:40 +09:00
cleanfile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
cleanpatch	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
coccicheck	coccicheck: return proper error code on fail	2018-08-14 08:58:56 +09:00
config	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
conmakehash.c
const_structs.checkpatch
decode_stacktrace.sh	scripts/decode_stacktrace.sh: prefix addr2line with $CROSS_COMPILE	2019-07-10 09:53:39 +02:00
decodecode	scripts/decodecode: make it take multiline Code line	2018-01-31 17:18:34 -08:00
depmod.sh	kbuild: modules_install: warn when missing System.map file	2018-09-09 09:14:07 +09:00
diffconfig	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
documentation-file-ref-check	scripts/documentation-file-ref-check: ignore sched-pelt false positive	2018-07-02 11:25:00 -06:00
export_report.pl
extract-cert.c
extract-ikconfig
extract-module-sig.pl	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
extract-sys-certs.pl	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
extract-vmlinux	scripts: teach extract-vmlinux about LZ4 and ZSTD	2018-07-08 09:32:32 +09:00
extract_xc3028.pl	MAINTAINERS & files: Canonize the e-mails I use at files	2018-05-04 06:21:06 -04:00
faddr2line	scripts/faddr2line: make the new code listing format optional	2018-06-05 09:04:37 -07:00
file-size.sh	kbuild: Use ls(1) instead of stat(1) to obtain file size	2018-03-26 02:01:24 +09:00
find-unused-docs.sh	scripts: Add a script to find unused documentation	2017-10-23 08:01:37 -06:00
gcc-goto.sh	jump_label: move 'asm goto' support test to Kconfig	2019-06-04 08:02:34 +02:00
gcc-ld	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
gcc-plugin.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
gcc-version.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
gcc-x86_32-has-stack-protector.sh	stack-protector: test compiler capability in Kconfig and drop AUTO mode	2018-06-08 18:56:00 +09:00
gcc-x86_64-has-stack-protector.sh	stack-protector: Fix test with 32-bit userland and CONFIG_64BIT=y	2018-06-25 23:21:13 +09:00
get_dvb_firmware
get_maintainer.pl	get_maintainer: allow option --mpath <directory> to read all files in <directory>	2018-08-22 10:52:48 -07:00
gfp-translate
headerdep.pl	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
headers.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
headers_check.pl	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
headers_install.sh	kbuild: Improve portability of some sed invocations	2018-03-26 02:01:18 +09:00
insert-sys-cert.c
kallsyms.c	kallsyms: exclude kasan local symbols on s390	2019-07-31 07:27:05 +02:00
Kbuild.include	x86/build: Remove jump label quirk for GCC older than 4.5.2	2018-08-30 11:37:08 +02:00
Kconfig.include	kbuild: Check for unknown options with cc-option usage in Kconfig and clang	2019-08-25 10:47:56 +02:00
kernel-doc	scripts/kernel-doc: Escape all literal braces in regexes	2018-08-06 13:36:20 -06:00
ld-version.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
leaking_addresses.pl	leaking_addresses: check if file name contains address	2018-04-07 08:50:34 +10:00
Lindent	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
link-vmlinux.sh	kbuild: rename LDFLAGS to KBUILD_LDFLAGS	2018-08-24 08:22:08 +09:00
Makefile	kbuild: Rename HOST_LOADLIBES to KBUILD_HOSTLDLIBS	2018-07-18 01:18:05 +09:00
Makefile.asm-generic	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Makefile.build	x86/retpoline: Make CONFIG_RETPOLINE depend on compiler support	2018-12-05 19:32:01 +01:00
Makefile.clean	kbuild: remove deprecated host-progs variable	2018-08-09 21:51:17 +09:00
Makefile.dtbinst	DeviceTree for 4.15:	2017-11-14 18:25:40 -08:00
Makefile.extrawarn	Kbuild: suppress packed-not-aligned warning for default setting only	2018-01-18 09:37:53 +09:00
Makefile.gcc-plugins	gcc-plugins: Regularize Makefile.gcc-plugins	2018-07-24 16:11:07 -07:00
Makefile.headersinst	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Makefile.host	kbuild: Rename HOST_LOADLIBES to KBUILD_HOSTLDLIBS	2018-07-18 01:18:05 +09:00
Makefile.kasan	kasan: rework Kconfig settings	2018-02-06 18:32:47 -08:00
Makefile.kcov	kcov: test compiler capability in Kconfig and correct dependency	2018-06-11 09:14:08 +09:00
Makefile.lib	kbuild: rename LDFLAGS to KBUILD_LDFLAGS	2018-08-24 08:22:08 +09:00
Makefile.modbuiltin	Kbuild: Makefile.modbuiltin: include auto.conf and tristate.conf mandatory	2018-08-03 00:47:00 +09:00
Makefile.modinst	kbuild: remove duplicated comments about PHONY	2018-07-06 22:04:03 +09:00
Makefile.modpost	kbuild: modpost: handle KBUILD_EXTRA_SYMBOLS only for external modules	2019-08-25 10:47:55 +02:00
Makefile.modsign	kbuild: remove duplicated comments about PHONY	2018-07-06 22:04:03 +09:00
Makefile.ubsan	lib/ubsan: remove null-pointer checks	2018-08-10 20:19:58 -07:00
makelst	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
markup_oops.pl
mkcompile_h	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
mkmakefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mksysmap
mkuboot.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
module-common.lds
namespace.pl	kbuild: rename built-in.o to built-in.a	2018-03-26 02:01:19 +09:00
objdiff
parse-maintainers.pl	parse-maintainers: add ability to specify filenames	2017-11-17 16:10:01 -08:00
patch-kernel	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
pnmtologo.c
profile2linkerlist.pl	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
prune-kernel	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
recordmcount.c	scripts: Fixed printf format mismatch	2018-05-29 22:04:12 +09:00
recordmcount.h	recordmcount: Fix spurious mcount entries on powerpc	2019-07-31 07:27:03 +02:00
recordmcount.pl	nds32/ftrace: Add RECORD_MCOUNT support	2018-09-04 14:45:18 +08:00
setlocalversion	Revert "scripts/setlocalversion: git: Make -dirty check more robust"	2018-11-27 16:13:08 +01:00
show_delta
sign-file.c
sortextable.c
sortextable.h
spdxcheck.py	scripts/spdxcheck.py: always open files in binary mode	2018-12-19 19:19:50 +01:00
spelling.txt	treewide: correct "differenciate" and "instanciate" typos	2018-08-23 18:48:43 -07:00
sphinx-pre-install	scripts/sphinx-pre-install: fix script for RHEL/CentOS	2019-08-16 10:12:44 +02:00
split-man.pl	MAINTAINERS & files: Canonize the e-mails I use at files	2018-05-04 06:21:06 -04:00
stackdelta	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
stackusage	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
subarch.include	selftests: add headers_install to lib.mk	2018-09-05 08:12:09 -06:00
tags.sh	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2018-07-18 19:32:54 -07:00
unifdef.c	unifdef: use memcpy instead of strncpy	2018-12-08 12:59:06 +01:00
ver_linux	ver_linux: Do not check for ver_linux pattern in version function	2018-07-07 17:44:52 +02:00
xen-hypercalls.sh	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
xz_wrap.sh