* builtins.c (do_mpc_arg1, fold_builtin_ccos): New.

	(fold_builtin_cexp): Ensure we get a complex REAL_TYPE.
	Evaluate constant arguments.
	(fold_builtin_carg): Ensure we get a complex REAL_TYPE.
	(fold_builtin_1): Likewise, also evaluate constant arguments.
	Remove superfluous break.
	(do_mpc_ckconv): New.
	* real.h: Include mpc.h.
	* toplev.c (print_version): Output MPC version info if available.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@147591 138bc75d-0d04-0410-961f-82ee72b054a4