[Bug c/59668] extraneous error messages at -O1, -O2 and -O3 for valid code with string library functions

[sch...@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59668

--- Comment #7 from Andreas Schwab <sch...@linux-m68k.org> ---
7.1.3 Reserved identifiers