Re: bison-2.6.4-generated parser triggers pragma warnings in GCC 4.6.3

[Paul Eggert]

The option that's taken in typical GNU code, when this
problem occurs, is to have an optional macro that, when
defined, causes initializations to be added that suffice
to pacify GCC.  Normally the macro is not defined, but
people who want to compile cleanly can define it.

In other gnu packages this macro is typically named 'lint'.
We may have to pick a name beginning with YY for namespace
cleanliness.