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Masahiro Yamada bb1435f3f5 Kconfig.debug: add toolchain checks for DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 
CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT does not give explicit
-gdwarf-* flag. The actual DWARF version is up to the toolchain.

The combination of GCC and GAS works fine, and Clang with the integrated
assembler is good too.

The combination of Clang and GAS is tricky, but at least, the -g flag
works for Clang <=13, which defaults to DWARF v4.

Clang 14 switched its default to DWARF v5.

Now, CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT has the same issue as
addressed by commit 98cd6f521f ("Kconfig: allow explicit opt in to
DWARF v5").

CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT=y for Clang >= 14 and
GAS < 2.35 produces a ton of errors like follows:

  /tmp/main-c2741c.s: Assembler messages:
  /tmp/main-c2741c.s:109: Error: junk at end of line, first unrecognized character is `"'
  /tmp/main-c2741c.s:109: Error: file number less than one

Add 'depends on' to check toolchains.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
2022-10-13 02:10:05 +09:00
arch Xtensa updates for v6.1 2022-10-10 14:21:11 -07:00
block cgroup changes for v6.1-rc1. 2022-10-10 11:12:25 -07:00
certs certs: make system keyring depend on built-in x509 parser 2022-09-24 04:31:18 +09:00
crypto crypto: tcrypt - add async speed test for aria cipher 2022-09-24 16:14:44 +08:00
Documentation IOMMU Updates for Linux v6.1: 2022-10-10 13:20:53 -07:00
drivers virtio: fixes, features 2022-10-10 14:02:53 -07:00
fs Xtensa updates for v6.1 2022-10-10 14:21:11 -07:00
include virtio: fixes, features 2022-10-10 14:02:53 -07:00
init Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
io_uring for-6.1/passthrough-2022-10-04 2022-10-07 09:35:50 -07:00
ipc ipc: mqueue: fix possible memory leak in init_mqueue_fs() 2022-10-09 16:10:22 -07:00
kernel More ACPI updates for 6.1-rc1 2022-10-10 13:28:06 -07:00
lib Kconfig.debug: add toolchain checks for DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT 2022-10-13 02:10:05 +09:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm cgroup changes for v6.1-rc1. 2022-10-10 11:12:25 -07:00
net cgroup changes for v6.1-rc1. 2022-10-10 11:12:25 -07:00
rust Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
samples Tracing updates for 6.1: 2022-10-10 12:20:55 -07:00
scripts Devicetree updates for v6.1: 2022-10-10 13:13:51 -07:00
security tpmdd updates for Linux v6.1-rc1 2022-10-10 13:09:33 -07:00
sound sound updates for 6.1-rc1 2022-10-05 12:02:07 -07:00
tools More power management updates for 6.1-rc1 2022-10-10 13:39:03 -07:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: remove KVM_REQ_UNHALT 2022-09-26 12:37:21 -04:00
.clang-format PCI/DOE: Add DOE mailbox support functions 2022-07-19 15:38:04 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap The first batch of KVM patches, mostly covering x86, which I 2022-10-09 09:39:55 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS dma-mapping updates for Linux 6.1 2022-10-10 13:24:55 -07:00
Makefile Devicetree updates for v6.1: 2022-10-10 13:13:51 -07:00
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.