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Masahiro Yamada b066e9ee99 kbuild: improve cc-option to clean up all temporary files 
[ Upstream commit f2f02ebd8f ]

When cc-option and friends evaluate compiler flags, the temporary file
$$TMP is created as an output object, and automatically cleaned up.
The actual file path of $$TMP is .<pid>.tmp, here <pid> is the process
ID of $(shell ...) invoked from cc-option. (Please note $$$$ is the
escape sequence of $$).

Such garbage files are cleaned up in most cases, but some compiler flags
create additional output files.

For example, -gsplit-dwarf creates a .dwo file.

When CONFIG_DEBUG_INFO_SPLIT=y, you will see a bunch of .<pid>.dwo files
left in the top of build directories. You may not notice them unless you
do 'ls -a', but the garbage files will increase every time you run 'make'.

This commit changes the temporary object path to .tmp_<pid>/tmp, and
removes .tmp_<pid> directory when exiting. Separate build artifacts such
as *.dwo will be cleaned up all together because their file paths are
usually determined based on the base name of the object.

Another example is -ftest-coverage, which outputs the coverage data into
<base-name-of-object>.gcno

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-06-30 15:38:06 -04:00
arch s390/ptrace: fix setting syscall number 2020-06-30 15:38:06 -04:00
block block/bio-integrity: don't free 'buf' if bio_integrity_add_page() failed 2020-06-30 15:37:57 -04:00
certs Replace magic for trusting the secondary keyring with #define 2018-09-09 19:55:54 +02:00
crypto crypto: algboss - don't wait during notifier callback 2020-06-25 15:42:01 +02:00
Documentation mtd: rawnand: Pass a nand_chip object to nand_release() 2020-06-25 15:42:00 +02:00
drivers net: alx: fix race condition in alx_remove 2020-06-30 15:38:06 -04:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs cifs/smb3: Fix data inconsistent when zero file range 2020-06-30 15:38:03 -04:00
include net: qed: fix left elements count calculation 2020-06-30 15:38:04 -04:00
init x86: Fix early boot crash on gcc-10, third try 2020-05-20 08:17:15 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:17:07 +02:00
kernel sched/core: Fix PI boosting between RT and DEADLINE tasks 2020-06-30 15:38:05 -04:00
lib lib/zlib: remove outdated and incorrect pre-increment optimization 2020-06-25 15:41:57 +02:00
mm mm: thp: make the THP mapcount atomic against __split_huge_pmd_locked() 2020-06-20 10:25:15 +02:00
net netfilter: ipset: fix unaligned atomic access 2020-06-30 15:38:05 -04:00
samples samples: bpf: Fix build error 2020-06-03 08:17:55 +02:00
scripts kbuild: improve cc-option to clean up all temporary files 2020-06-30 15:38:06 -04:00
security apparmor: don't try to replace stale label in ptraceme check 2020-06-30 15:37:57 -04:00
sound ASoC: rockchip: Fix a reference count leak. 2020-06-30 15:38:04 -04:00
tools perf report: Fix NULL pointer dereference in hists__fprintf_nr_sample_events() 2020-06-25 15:41:58 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: arm: vgic: Fix limit condition when writing to GICD_I[CS]ACTIVER 2020-05-20 08:16:58 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile Linux 4.14.186 2020-06-25 15:42:02 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.