[Flex-help] Spurious compiler warning when building PostgreSQL

[Peter G. <pet...@gm...>]

In file included from gram.y:12962:0:
scan.c: In function ‘yy_try_NUL_trans’:
scan.c:16246:23: warning: unused variable ‘yyg’ [-Wunused-variable]

This refers to this variable:

 struct yyguts_t * yyg = (struct yyguts_t*)yyscanner; /* This var may
be unused depending upon options. */

This is a known problem with Flex. I'd be really grateful is someone
could figure out a way of fixing this - the responsibility to fix the
warning, which is seen on every compiler, clearly lies with the Flex
developers. We can't do anything about it, much as we'd like to. If an
elegant solution doesn't present itself, surely it can't be a problem
to tack on some code that will be optimised away to suppress the
warning? Surely that's better than having everyone wonder why this
warning is seen?

Thanks

-- 
Regards,
Peter Geoghegan