linux-next: build failure after merge of the kbuild tree

[Stephen Rothwell]

Hi Masahiro,

After merging the kbuild tree, today's linux-next build (powerpc
ppc64_defconfig) failed like this:

make was continually spawning test compiles.

I used the kbuild tree from next-20180529 for today.

A (partial) strace seemed to show that it was testing for compiler flags
(some more than once).

-- 
Cheers,
Stephen Rothwell

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