a22c5cf5d3
Using an old .config in combination with "make oldconfig" can cause an incorrect detection of the compat compiler: $ grep CROSS_COMPILE_COMPAT .config CONFIG_CROSS_COMPILE_COMPAT_VDSO="" $ make oldconfig && make arch/arm64/Makefile:58: gcc not found, check CROSS_COMPILE_COMPAT. Stop. Accordingly to the section 7.2 of the GNU Make manual "Syntax of Conditionals", "When the value results from complex expansions of variables and functions, expansions you would consider empty may actually contain whitespace characters and thus are not seen as empty. However, you can use the strip function to avoid interpreting whitespace as a non-empty value." Fix the issue adding strip to the CROSS_COMPILE_COMPAT string evaluation. Reported-by: Matteo Croce <mcroce@redhat.com> Tested-by: Matteo Croce <mcroce@redhat.com> Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.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.