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e4bb020f3d
Some extensions use .option arch directive to selectively enable certain extensions in parts of its assembly code. For example, Zbb uses it to inform assmebler to emit bit manipulation instructions. However, supporting of this directive only exist on GNU assembler and has not landed on clang at the moment, making TOOLCHAIN_HAS_ZBB depend on AS_IS_GNU. While it is still under review at https://reviews.llvm.org/D123515, the upcoming Vector patch also requires this feature in assembler. Thus, provide Kconfig AS_HAS_OPTION_ARCH to detect such feature. Then TOOLCHAIN_HAS_XXX will be turned on automatically when the feature land. Suggested-by: Nathan Chancellor <nathan@kernel.org> Signed-off-by: Andy Chiu <andy.chiu@sifive.com> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu> Link: https://lore.kernel.org/r/20230605110724.21391-24-andy.chiu@sifive.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.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.