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Since commitd5470d1443("kbuild: re-implement Makefile.headersinst without recursion"), headers_install emits an ugly warning. $ make headers_install [ snip ] UPD include/generated/uapi/linux/version.h find: ‘./include/uapi/Kbuild’: No such file or directory HDRINST usr/include/video/uvesafb.h ... This happens for GNU Make <= 4.2.1 When I wrote that commit, I missed this warning because I was using the state-of-the-art Make version compiled from the git tree. $(wildcard $(src)/*/) is intended to match to only existing directories since it has a trailing slash, but actually matches to regular files too. (include/uapi/Kbuild in this case) This is a bug of GNU Make, and was fixed by: | commit b7acb10e86dc8f5fdf2a2bbd87e1059c315e31d6 | Author: spagoveanu@gmail.com <spagoveanu@gmail.com> | Date: Wed Jun 20 02:03:48 2018 +0300 | | * src/dir.c: Preserve glob d_type field We need to cater to old Make versions. Add '$(filter %/,...) to filter out the regular files. Fixes:d5470d1443("kbuild: re-implement Makefile.headersinst without recursion") Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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.