Masahiro Yamada 76426e2388 kbuild: add dummy toolchains to enable all cc-option etc. in Kconfig ... Staring v4.18, Kconfig evaluates compiler capabilities, and hides CONFIG options your compiler does not support. This works well if you configure and build the kernel on the same host machine. It is inconvenient if you prepare the .config that is carried to a different build environment (typically this happens when you package the kernel for distros) because using a different compiler potentially produces different CONFIG options than the real build environment. So, you probably want to make as many options visible as possible. In other words, you need to create a super-set of CONFIG options that cover any build environment. If some of the CONFIG options turned out to be unsupported on the build machine, they are automatically disabled by the nature of Kconfig. However, it is not feasible to get a full-featured compiler for every arch. This issue was discussed here: https://lkml.org/lkml/2019/12/9/620 Other than distros, savedefconfig is also a problem. Some arch sub-systems periodically resync defconfig files. If you use a less-capable compiler for savedefconfig, options that do not meet 'depends on $(cc-option,...)' will be forcibly disabled. So, 'make defconfig && make savedefconfig' may silently change the behavior. This commit adds a set of dummy toolchains that pretend to support any feature. Most of compiler features are tested by cc-option, which simply checks the exit code of $(CC). The dummy tools are shell scripts that always exit with 0. So, $(cc-option, ...) is evaluated as 'y'. There are more complicated checks such as: scripts/gcc-x86_{32,64}-has-stack-protector.sh scripts/gcc-plugin.sh scripts/tools-support-relr.sh scripts/dummy-tools/gcc passes all checks. From the top directory of the source tree, you can do: $ make CROSS_COMPILE=scripts/dummy-tools/ oldconfig Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Tested-by: Jeremy Cline <jcline@redhat.com>		2020-04-09 00:13:45 +09:00
..
atomic	locking/atomics: Use sed(1) instead of non-standard head(1) option	2019-06-25 10:17:07 +02:00
basic	SPDX patches for 5.7-rc1.	2020-04-03 13:12:26 -07:00
coccinelle	mm: remove __krealloc	2020-02-04 03:05:24 +00:00
dtc	SPDX patches for 5.7-rc1.	2020-04-03 13:12:26 -07:00
dummy-tools	kbuild: add dummy toolchains to enable all cc-option etc. in Kconfig	2020-04-09 00:13:45 +09:00
gcc-plugins	gcc-plugins: drop support for GCC <= 4.7	2020-04-09 00:13:45 +09:00
gdb	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
genksyms	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
kconfig	kconfig: qconf: Fix a few alignment issues	2020-04-09 00:13:45 +09:00
ksymoops	…
mod	Char/Misc driver patches for 5.7-rc1	2020-04-03 13:22:40 -07:00
package	kbuild: deb-pkg: fix warning when CONFIG_DEBUG_INFO is unset	2020-03-30 09:23:00 +09:00
selinux	SPDX patches for 5.7-rc1.	2020-04-03 13:12:26 -07:00
tracing	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
Kbuild.include	kbuild: remove *.tmp file when filechk fails	2020-01-16 00:26:22 +09:00
Kconfig.include	gcc-plugins: drop support for GCC <= 4.7	2020-04-09 00:13:45 +09:00
Lindent	…
Makefile	kbuild: remove -I$(srctree)/tools/include from scripts/Makefile	2020-04-09 00:13:45 +09:00
Makefile.asm-generic	kbuild: force all architectures except um to include mandatory-y	2019-03-17 12:56:32 +09:00
Makefile.build	kbuild: link lib-y objects to vmlinux forcibly when CONFIG_MODULES=y	2020-04-09 00:13:45 +09:00
Makefile.clean	gcc-plugins: drop support for GCC <= 4.7	2020-04-09 00:13:45 +09:00
Makefile.dtbinst	kbuild: refactor Makefile.dtbinst more	2020-03-25 10:19:43 +09:00
Makefile.extrawarn	kbuild: Enable -Wtautological-compare	2020-04-09 00:13:45 +09:00
Makefile.gcc-plugins	gcc-plugins: structleak: Generalize to all variable types	2019-03-04 09:29:41 -08:00
Makefile.headersinst	kbuild: move headers_check rule to usr/include/Makefile	2019-11-15 00:23:10 +09:00
Makefile.host	gcc-plugins: drop support for GCC <= 4.7	2020-04-09 00:13:45 +09:00
Makefile.kasan	kasan/arm64: fix CONFIG_KASAN_SW_TAGS && KASAN_INLINE	2019-08-15 13:24:04 +01:00
Makefile.kcov	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile.lib	kbuild: Always validate DT binding examples	2020-03-03 20:49:21 +09:00
Makefile.modfinal	kbuild: move modkern_{c,a}flags to Makefile.lib from Makefile.build	2019-08-22 01:14:11 +09:00
Makefile.modinst	kbuild: modinst: read modules.order instead of $(MODVERDIR)/*.mod	2019-07-17 22:39:27 +09:00
Makefile.modpost	modpost: return error if module is missing ns imports and MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS=n	2020-03-13 10:04:36 +09:00
Makefile.modsign	kbuild: modsign: read modules.order instead of $(MODVERDIR)/*.mod	2019-07-17 22:39:27 +09:00
Makefile.package	kbuild: Add make dir-pkg build option	2019-11-11 20:10:01 +09:00
Makefile.ubsan	ubsan: split "bounds" checker from other options	2020-04-07 10:43:44 -07:00
adjust_autoksyms.sh	kbuild: split adjust_autoksyms.sh in two parts	2020-03-03 20:49:21 +09:00
asn1_compiler.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36	2019-05-24 17:27:11 +02:00
bin2c.c	…
bloat-o-meter	…
bootgraph.pl	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 391	2019-06-05 17:37:11 +02:00
bpf_helpers_doc.py	bpf_helpers_doc.py: Fix warning when compiling bpftool	2020-03-13 20:53:40 +01:00
cc-can-link.sh	…
check-sysctl-docs	docs: add a script to check sysctl docs	2020-02-25 03:35:16 -07:00
check_extable.sh	…
checkincludes.pl	…
checkkconfigsymbols.py	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
checkpatch.pl	checkpatch: avoid warning about uninitialized_var()	2020-04-07 10:43:44 -07:00
checkstack.pl	scripts/checkstack.pl: Fix arm64 wrong or unknown architecture	2019-06-05 02:33:10 +09:00
checksyscalls.sh	checksyscalls: fix up mq_timedreceive and stat exceptions	2019-02-19 21:27:53 +01:00
checkversion.pl	…
clang-version.sh	kbuild: update comment block of scripts/clang-version.sh	2019-03-04 22:34:54 +09:00
cleanfile	…
cleanpatch	…
coccicheck	…
config	…
const_structs.checkpatch	…
decode_stacktrace.sh	scripts/decode_stacktrace: Accept dash/underscore in modules	2019-07-12 11:05:41 -07:00
decodecode	…
depmod.sh	…
diffconfig	…
documentation-file-ref-check	SCSI misc on 20200402	2020-04-02 17:03:53 -07:00
export_report.pl	modpost: move the namespace field in Module.symvers last	2020-03-17 08:59:03 +09:00
extract-cert.c	…
extract-ikconfig	…
extract-module-sig.pl	…
extract-sys-certs.pl	…
extract-vmlinux	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 378	2019-06-05 17:37:10 +02:00
extract_xc3028.pl	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 339	2019-06-05 17:37:07 +02:00
faddr2line	…
file-size.sh	…
find-unused-docs.sh	scripts/find-unused-docs: Fix massive false positives	2020-01-27 14:25:06 -07:00
gcc-goto.sh	…
gcc-ld	…
gcc-plugin.sh	gcc-plugins: drop support for GCC <= 4.7	2020-04-09 00:13:45 +09:00
gcc-version.sh	kbuild: clean up scripts/gcc-version.sh	2019-03-04 22:35:04 +09:00
gcc-x86_32-has-stack-protector.sh	…
gcc-x86_64-has-stack-protector.sh	…
gen_autoksyms.sh	kbuild: generate autoksyms.h early	2020-03-03 20:49:21 +09:00
gen_compile_commands.py	gen_compile_commands: lower the entry count threshold	2019-07-27 12:18:19 +09:00
gen_ksymdeps.sh	…
get_abi.pl	doc: ABI scripts: add a SPDX header file	2019-06-21 16:58:37 +02:00
get_dvb_firmware	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 61	2019-05-24 17:36:45 +02:00
get_maintainer.pl	scripts/get_maintainer.pl: deprioritize old Fixes: addresses	2020-02-21 11:22:15 -08:00
gfp-translate	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
headerdep.pl	…
headers_check.pl	…
headers_install.sh	kbuild: re-implement detection of CONFIG options leaked to user-space	2019-08-21 21:05:21 +09:00
insert-sys-cert.c	…
jobserver-exec	docs, parallelism: Rearrange how jobserver reservations are made	2019-11-22 10:35:18 -07:00
kallsyms.c	scripts/kallsyms: fix wrong kallsyms_relative_base	2020-03-19 23:40:20 +09:00
kernel-doc	scripts/kernel-doc: Add support for named variable macro arguments	2019-11-07 13:17:24 -07:00
ld-version.sh	…
leaking_addresses.pl	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
link-vmlinux.sh	bpf: Support llvm-objcopy for vmlinux BTF	2020-03-19 12:32:38 +01:00
makelst	…
markup_oops.pl	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 373	2019-06-05 17:37:10 +02:00
mkcompile_h	kbuild: mkcompile_h: Include $LD version in /proc/version	2020-04-09 00:13:45 +09:00
mkmakefile	kbuild: get rid of $(realpath ...) from scripts/mkmakefile	2019-08-29 23:54:29 +09:00
mksysmap	…
mkuboot.sh	…
module-common.lds	…
modules-check.sh	kbuild: get rid of kernel/ prefix from in-tree modules.{order,builtin}	2019-07-17 22:39:27 +09:00
namespace.pl	namespace: fix namespace.pl script to support relative paths	2019-10-05 15:29:49 +09:00
nsdeps	scripts/nsdeps: support nsdeps for external module builds	2019-11-11 20:10:01 +09:00
objdiff	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 199	2019-05-30 11:29:23 -07:00
parse-maintainers.pl	parse-maintainers: Do not sort section content by default	2020-03-26 15:08:27 -07:00
patch-kernel	…
profile2linkerlist.pl	…
prune-kernel	…
recordmcount.c	ARM: 8950/1: ftrace/recordmcount: filter relocation types	2020-01-19 16:08:25 +00:00
recordmcount.h	recordmcount: Fix nop_mcount() function	2019-10-12 20:49:33 -04:00
recordmcount.pl	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
setlocalversion	scripts: setlocalversion: replace backquote to dollar parenthesis	2019-11-11 20:10:01 +09:00
show_delta	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 438	2019-06-05 17:37:17 +02:00
sign-file.c	…
sorttable.c	scripts/sorttable: Implement build-time ORC unwind table sorting	2019-12-13 10:47:58 +01:00
sorttable.h	scripts/sorttable: Implement build-time ORC unwind table sorting	2019-12-13 10:47:58 +01:00
spdxcheck-test.sh	…
spdxcheck.py	spdxcheck.py: fix directory structures	2019-06-01 15:51:31 -07:00
spelling.txt	scripts/spelling.txt: add more spellings to spelling.txt	2020-04-02 09:35:25 -07:00
sphinx-pre-install	scripts/sphinx-pre-install: add '-p python3' to virtualenv	2020-03-02 13:08:11 -07:00
split-man.pl	…
stackdelta	…
stackusage	…
subarch.include	…
tags.sh	kbuild: add a flag to force absolute path for srctree	2019-07-11 00:05:09 +09:00
tools-support-relr.sh	scripts/tools-support-relr.sh: un-quote variables	2019-11-13 10:52:05 +00:00
unifdef.c	…
ver_linux	ver_linux: Query ld cache for versions of libc/libcpp run-time	2020-02-10 13:35:15 -08:00
xen-hypercalls.sh	…
xz_wrap.sh	…