Not now, no, but back in the 4.0 days (2005) GCC still used a yacc/bison parser for C; it had switched to a hand written parser for C++. The C++ yacc parser was

Not now, no, but back in the 4.0 days (2005) GCC still used a yacc/bison parser for C; it had switched to a hand written parser for C++. The C++ yacc parser was still in use as of GCC 3.3 (2003).