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7fd9fd46a4
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Adrian Ratiu 7fd9fd46a4 tools: Fix unavoidable GCC call in Clang builds 
In ChromeOS and Gentoo we catch any unwanted mixed Clang/LLVM
and GCC/binutils usage via toolchain wrappers which fail builds.
This has revealed that GCC is called unconditionally in Clang
configured builds to populate GCC_TOOLCHAIN_DIR.

Allow the user to override CLANG_CROSS_FLAGS to avoid the GCC
call - in our case we set the var directly in the ebuild recipe.

In theory Clang could be able to autodetect these settings so
this logic could be removed entirely, but in practice as the
commit cebdb73745 ("tools: Help cross-building with clang")
mentions, this does not always work, so giving distributions
more control to specify their flags & sysroot is beneficial.

Suggested-by: Manoj Gupta <manojgupta@chromium.com>
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/lkml/87czjk4osi.fsf@ryzen9.i-did-not-set--mail-host-address--so-tickle-me
Link: https://lore.kernel.org/bpf/20220308121428.81735-1-adrian.ratiu@collabora.com
2022-03-08 23:36:37 +01:00
arch Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-03-04 19:28:17 -08:00
block block: clear iocb->private in blkdev_bio_end_io_async() 2022-02-22 06:59:49 -07:00
certs certs: Fix build error when CONFIG_MODULE_SIG_KEY is empty 2022-01-23 00:08:44 +09:00
crypto crypto: af_alg - get rid of alg_memory_allocated 2022-02-15 14:29:04 +00:00
Documentation dt-bindings: net: dsa: add rtl8_4 and rtl8_4t tag formats 2022-03-05 11:04:25 +00:00
drivers bnxt_en: add an nvm test for hw diagnose 2022-03-05 11:16:56 +00:00
fs Change since last update: 2022-03-02 12:08:36 -08:00
include bpf: Reject programs that try to load __percpu memory. 2022-03-05 18:38:15 -08:00
init Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-02-09 18:40:56 -08:00
ipc ipc/sem: do not sleep with a spin lock held 2022-02-04 09:25:05 -08:00
kernel bpf: Determine buf_info inside check_buffer_access() 2022-03-08 15:36:45 +01:00
lib Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2022-03-04 19:28:17 -08:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm memblock: use kfree() to release kmalloced memblock regions 2022-02-26 12:00:44 -08:00
net selftests/bpf: Add tests for kfunc register offset checks 2022-03-05 15:29:36 -08:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-02-17 11:44:20 -08:00
scripts scripts/pahole-flags.sh: Parse DWARF and generate BTF with multithreading. 2022-02-22 14:32:44 -08:00
security net: rtnetlink: Add RTM_SETSTATS 2022-03-03 10:37:23 +00:00
sound spi: Make remove() return void 2022-02-28 10:43:07 -08:00
tools tools: Fix unavoidable GCC call in Clang builds 2022-03-08 23:36:37 +01:00
usr kbuild: remove include/linux/cyclades.h from header file check 2022-01-27 08:51:08 +01:00
virt KVM: Fix lockdep false negative during host resume 2022-02-17 09:52:50 -05:00
.clang-format genirq/msi: Make interrupt allocation less convoluted 2021-12-16 22:22:20 +01:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update Roman Gushchin's email 2022-02-26 09:51:17 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: replace a Microchip AT91 maintainer 2022-02-09 11:30:01 +01:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2022-03-03 11:55:12 -08:00
Makefile Linux 5.17-rc6 2022-02-27 14:36:33 -08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.