sql/mysql_priv.h:
  see change done in sys_vars.cc
sql/mysqld.cc:
  functions were defined all the time but not used if in libmysqld
sql/sql_select.cc:
  const_part is unsigned, 1<<etc is signed
sql/sql_yacc.yy:
  parenthesis
sql/sys_vars.cc:
  offsetof() gives warning for non-POD types, but it's said to be safe if the type only has a constructor (see definition
  of my_offsetof() for more info).