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arch: use cross_compiling to check whether it is a cross build or not
'cross_compiling' is defined by the top Makefile and available for
arch Makefiles to check whether it is a cross build or not. A good
thing is the variable name 'cross_compiling' is self-documenting.
This is a simple replacement for m68k, mips, sh, for which $(ARCH)
and $(SRCARCH) always match.
No functional change is intended for xtensa, either.
This is rather a fix for parisc because arch/parisc/Makefile defines
UTS_MATCHINE depending on CONFIG_64BIT, therefore cc-cross-prefix
is not working in Kconfig time.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Helge Deller <deller@gmx.de> # parisc
Acked-by: Max Filippov <jcmvbkbc@gmail.com> # xtensa