CONFIG_NUMERIC_CONSTANT=
And on reading it back in, it would complain that '' was an invalid value for
that field. I.E. "make allnoconfig && make" worked fine, but
"make allnoconfig && make menuconfig" barfed reading in the config file.
So now I have it write out "0" as the blank value. (It's initialized to the
default value when the menu becomes visible anyway; I checked.) That seems
to work.
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