Re: AC_PROG_YACC: use bison -o y.tab.c

[Paul Eggert]

Thanks, I installed that into Autoconf with a slightly terser NEWS entry:

- AC_PROG_YACC now uses 'bison -o y.tab.c' instead of 'bison -y', so that
  by default it no longer warns about Bison extensions.  Add -Wyacc to
  YFLAGS to enable these warnings.