Masahiro Yamada 7f3a59db27 kbuild: add infrastructure to build userspace programs ... Kbuild supports the infrastructure to build host programs, but there was no support to build userspace programs for the target architecture (i.e. the same architecture as the kernel). Sam Ravnborg worked on this in 2014 (https://lkml.org/lkml/2014/7/13/154), but it was not merged. One problem at that time was, there was no good way to know whether $(CC) can link standalone programs. In fact, pre-built kernel.org toolchains [1] are often used for building the kernel, but they do not provide libc. Now, we can handle this cleanly because the compiler capability is evaluated at the Kconfig time. If $(CC) cannot link standalone programs, the relevant options are hidden by 'depends on CC_CAN_LINK'. The implementation just mimics scripts/Makefile.host The userspace programs are compiled with the same flags as the host programs. In addition, it uses -m32 or -m64 if it is found in $(KBUILD_CFLAGS). This new syntax has two usecases. - Sample programs Several userspace programs under samples/ include UAPI headers installed in usr/include. Most of them were previously built for the host architecture just to use the 'hostprogs' syntax. However, 'make headers' always works for the target architecture. This caused the arch mismatch in cross-compiling. To fix this distortion, sample code should be built for the target architecture. - Bpfilter net/bpfilter/Makefile compiles bpfilter_umh as the user mode helper, and embeds it into the kernel. Currently, it overrides HOSTCC with CC to use the 'hostprogs' syntax. This hack should go away. [1]: https://mirrors.edge.kernel.org/pub/tools/crosstool/ Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Sam Ravnborg <sam@ravnborg.org>		2020-05-17 18:52:01 +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	kbuild: check libyaml installation for 'make dt_binding_check'	2020-04-17 10:45:23 -05:00
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-common.h: Update for GCC 10	2020-04-13 10:19:20 -07:00
gdb	scripts/gdb: repair rb_first() and rb_last()	2020-05-07 19:27:20 -07:00
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
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	kbuild: move bin2c back to scripts/ from scripts/basic/	2018-07-18 01:18:05 +09:00
bloat-o-meter	bloat-o-meter: ignore __addressable_ symbols	2018-12-28 12:11:44 -08:00
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	bpfilter: check compiler capability in Kconfig	2018-06-28 13:36:39 +09:00
check_extable.sh
check-sysctl-docs	docs: add a script to check sysctl docs	2020-02-25 03:35:16 -07:00
checkincludes.pl
checkkconfigsymbols.py	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
checkpatch.pl	checkpatch: fix a typo in the regex for $allocFunctions	2020-04-21 11:11:55 -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	coccicheck: return proper error code on fail	2018-08-14 08:58:56 +09:00
config	scripts/config: allow colons in option strings for sed	2020-04-23 01:10:16 +09:00
const_structs.checkpatch
decode_stacktrace.sh	scripts/decode_stacktrace: Accept dash/underscore in modules	2019-07-12 11:05:41 -07:00
decodecode	scripts/decodecode: fix trapping instruction formatting	2020-05-07 19:27:20 -07:00
depmod.sh	kbuild: modules_install: warn when missing System.map file	2018-09-09 09:14:07 +09:00
diffconfig
documentation-file-ref-check	scripts: documentation-file-ref-check: Add line break before exit	2020-04-15 15:13:13 -06:00
export_report.pl	modpost: move the namespace field in Module.symvers last	2020-03-17 08:59:03 +09:00
extract_xc3028.pl	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 339	2019-06-05 17:37:07 +02:00
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
faddr2line	scripts/faddr2line: fix location of start_kernel in comment	2018-11-18 10:15:09 -08:00
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/find-unused-docs: Fix massive false positives	2020-01-27 14:25:06 -07:00
gcc-goto.sh	jump_label: move 'asm goto' support test to Kconfig	2019-01-06 09:46:51 +09:00
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	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
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	kbuild: simplify dependency generation for CONFIG_TRIM_UNUSED_KSYMS	2018-12-01 23:13:14 +09:00
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	gcc-10 warnings: fix low-hanging fruit	2020-05-04 09:16:37 -07:00
Kbuild.include	kbuild: use -MMD instead of -MD to exclude system headers from dependency	2020-05-12 13:28:33 +09:00
Kconfig.include	gcc-plugins: drop support for GCC <= 4.7	2020-04-09 00:13:45 +09:00
kernel-doc	scripts/kernel-doc: Add missing close-paren in c:function directives	2020-04-15 14:58:12 -06:00
ld-version.sh
leaking_addresses.pl	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 166	2019-05-30 11:26:39 -07:00
Lindent
link-vmlinux.sh	bpf: Support llvm-objcopy for vmlinux BTF	2020-03-19 12:32:38 +01:00
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: add infrastructure to build userspace programs	2020-05-17 18:52:01 +09:00
Makefile.clean	kbuild: add infrastructure to build userspace programs	2020-05-17 18:52:01 +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	kbuild: use -MMD instead of -MD to exclude system headers from dependency	2020-05-12 13:28:33 +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: warn if always, hostprogs-y, or hostprogs-m is used	2020-05-17 18:51:28 +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
Makefile.userprogs	kbuild: add infrastructure to build userspace programs	2020-05-17 18:52:01 +09:00
makelst
markup_oops.pl	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 373	2019-06-05 17:37:10 +02:00
mkcompile_h	kbuild: use CONFIG_CC_VERSION_TEXT to construct LINUX_COMPILER macro	2020-05-12 13:28:33 +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	scripts: add spdxcheck.py self test	2018-12-28 12:11:44 -08:00
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	MAINTAINERS & files: Canonize the e-mails I use at files	2018-05-04 06:21:06 -04:00
stackdelta
stackusage
subarch.include	selftests: add headers_install to lib.mk	2018-09-05 08:12:09 -06:00
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	unifdef: use memcpy instead of strncpy	2018-11-30 14:45:01 -08:00
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