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42449052c9
The vdso Makefile adds -U$(ARCH) to CPPFLAGS for the vdso64.lds linker script. ARCH is always powerpc, so it becomes -Upowerpc, which means undefine the "powerpc" symbol. But the 64-bit compiler doesn't define powerpc in the first place, compare: $ gcc-5.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc -m32 -E -dM - </dev/null | grep -w powerpc #define powerpc 1 $ gcc-5.1.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc -m64 -E -dM - </dev/null | grep -w powerpc $ So there's no need to undefine it for the 64-bit linker script. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20231206115548.1466874-2-mpe@ellerman.id.au
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.