From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: tools/testing/selftests/bpf/Makefile
Date: Sat, 22 Apr 2017 15:45:01 -0400 (EDT)
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Alexei, that unconditional -D__x86_64__ isn't going to work.  It in
fact makes the build break on sparc because the types.h asm headers
explicitly check for things like __sparc__ && __arch64__ etc.

There are other places that want stuff like this, so let's do it
right.

In every

	arch/${ARCH}/Makefile

extract out the "-DXXX" stuff from CHECKFLAGS into a new Makefile
variable, expand that into CHECKFLAGS and use the new variable in
places like

	tools/testing/selftests/bpf/Makefile

and

	tools/testing/selftests/ipc/Makefile

Thanks.