* config/darwin.c (darwin_one_byte_bool): New global variable.
        * config/darwin.h (darwin_one_byte_bool): Declare.
        (SUBTARGET_OPTIONS): Define macro.  (for -mone-byte-bool flag.)
        * config/rs6000/darwin.h (BOOL_TYPE_SIZE): Conditionalize on
        value of darwin_one_byte_bool.
        * doc/invoke.texi: Document -mone-byte-bool flag.
        * testsuite/gcc.dg/darwin-bool-1.c: New test.
        * testsuite/gcc.dg/darwin-bool-2.c: New test.

From-SVN: r85277