Hi,

When I was working to update patch as Richard's review comments
here https://gcc.gnu.org/pipermail/gcc-patches/2020-August/551474.html£¬
I noticed that the options "-Q --help=params" don't show the final values
after target option overriding, instead it emits the default values in
params.opt (without any explicit param settings).

I guess it's more meaningful to get it to emit values post-overrided,
to avoid possible confusion for users.  Does it make sense?
Or are there any concerns?

btw, not sure whether it's a good idea to move target_option_override_hook
call into print_specific_help and use one function local static
variable to control it's called once for all kinds of help dumping
(possible combination), then can remove the calls in function 
common_handle_option.


BR,
Kewen
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gcc/ChangeLog:

	* opts-global.c (decode_options): Adjust call to print_help.
	* opts.c (print_help): Add one function point argument
	target_option_override_hook and call it before print_specific_help.
	* opts.h (print_help): Add one more argument to function declare.