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[ Upstream commitef7cfd00b2] For the same reason as commit25896d073d("x86/build: Fix compiler support check for CONFIG_RETPOLINE"), you cannot put this $(error ...) into the parse stage of the top Makefile. Perhaps I'd propose a more sophisticated solution later, but this is the best I can do for now. Link: https://lkml.org/lkml/2017/12/25/211 Reported-by: Paul Gortmaker <paul.gortmaker@windriver.com> Reported-by: Bernd Edlinger <bernd.edlinger@hotmail.de> Reported-by: Qian Cai <cai@lca.pw> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Tested-by: Qian Cai <cai@lca.pw> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.
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.