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Douglas Anderson 0c22be0712 kbuild: Make NOSTDINC_FLAGS a simply expanded variable 
During a simple no-op (nothing changed) build I saw 39 invocations of
the C compiler with the argument "-print-file-name=include".  We don't
need to call the C compiler 39 times for this--one time will suffice.

Let's change NOSTDINC_FLAGS to a simply expanded variable to avoid
this since there doesn't appear to be any reason it should be
recursively expanded.

On my build this shaved ~400 ms off my "no-op" build.

Note that the recursive expansion seems to date back to the (really
old) commit e8f5bdb02c ("[PATCH] Makefile include path ordering").
It's a little unclear to me if the point of that patch was to switch
the variable to be recursively expanded (which it did) or to avoid
directly assigning to NOSTDINC_FLAGS (AKA to switch to +=) because
someone else (out of tree?) was setting it.  I presume later since if
the only goal was to switch to recursive expansion the patch would
have just removed the ":".

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2019-03-17 12:56:30 +09:00
arch unicore32: simplify linker script generation for decompressor 2019-03-14 02:39:11 +09:00
block
certs
crypto
Documentation pwm: Changes for v5.1-rc1 2019-03-13 10:01:10 -07:00
drivers pwm: Changes for v5.1-rc1 2019-03-13 10:01:10 -07:00
fs filesystem-dax for 5.1 2019-03-13 09:37:09 -07:00
include pwm: Changes for v5.1-rc1 2019-03-13 10:01:10 -07:00
init
ipc
kernel
lib libfdt: prefix header search paths with $(srctree)/ 2019-03-14 02:36:04 +09:00
LICENSES
mm
net Miscellaneous NFS server fixes. Probably the most visible bug is one 2019-03-12 15:06:54 -07:00
samples
scripts kbuild: deb-pkg: avoid implicit effects 2019-03-17 12:56:23 +09:00
security
sound
tools
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS libnvdimm for v5.1 2019-03-13 09:41:18 -07:00
Makefile kbuild: Make NOSTDINC_FLAGS a simply expanded variable 2019-03-17 12:56:30 +09:00
README

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.