c++: Fix up -fcontract* options

  Hi!

I've noticed
+FAIL: compiler driver --help=c++ option(s): "^ +-.*[^:.]\$" absent from output: "  -fcontract-build-level=[off|default|audit] Specify max contract level to generate runtime checks for"
error, this is due to missing dot at the end of the description.

The second part of the first hunk should fix that, but while at it,
I find it weird that some options don't have RejectNegative, yet
for options that accept an argument a negative option looks weird
and isn't really handled.

Though, shall we have those [on|off] options at all?
Those are inconsistent with all other boolean options gcc has.
Every other boolean option is -fwhatever for it being on
and -fno-whatever for it being off, shouldn't the options be
without arguments and accept negatives (-fcontract-assumption-mode
vs. -fno-contract-assumption-mode etc.)?

2022-11-21  Jakub Jelinek  <jakub@redhat.com>

	* c.opt (fcontract-assumption-mode=, fcontract-continuation-mode=,
	fcontract-role=, fcontract-semantic=): Add RejectNegative.
	(fcontract-build-level=): Terminate description with dot.


	Jakub
  

On 11/21/22 18:00, Jakub Jelinek wrote:
> Hi!
> 
> I've noticed
> +FAIL: compiler driver --help=c++ option(s): "^ +-.*[^:.]\$" absent from output: "  -fcontract-build-level=[off|default|audit] Specify max contract level to generate runtime checks for"
> error, this is due to missing dot at the end of the description.
> 
> The second part of the first hunk should fix that, but while at it,
> I find it weird that some options don't have RejectNegative, yet
> for options that accept an argument a negative option looks weird
> and isn't really handled.

OK.

> Though, shall we have those [on|off] options at all?
> Those are inconsistent with all other boolean options gcc has.
> Every other boolean option is -fwhatever for it being on
> and -fno-whatever for it being off, shouldn't the options be
> without arguments and accept negatives (-fcontract-assumption-mode
> vs. -fno-contract-assumption-mode etc.)?

True, but I think let's leave them alone for now, they'll probably all 
be replaced as the feature specification evolves.

> 2022-11-21  Jakub Jelinek  <jakub@redhat.com>
> 
> 	* c.opt (fcontract-assumption-mode=, fcontract-continuation-mode=,
> 	fcontract-role=, fcontract-semantic=): Add RejectNegative.
> 	(fcontract-build-level=): Terminate description with dot.
> 
> --- gcc/c-family/c.opt.jj	2022-11-19 09:21:14.314444706 +0100
> +++ gcc/c-family/c.opt	2022-11-21 23:51:55.605736499 +0100
> @@ -1692,12 +1692,12 @@ EnumValue
>   Enum(on_off) String(on) Value(1)
>   
>   fcontract-assumption-mode=
> -C++ Joined
> +C++ Joined RejectNegative
>   -fcontract-assumption-mode=[on|off]	Enable or disable treating axiom level contracts as assumptions (default on).
>   
>   fcontract-build-level=
>   C++ Joined RejectNegative
> --fcontract-build-level=[off|default|audit]	Specify max contract level to generate runtime checks for
> +-fcontract-build-level=[off|default|audit]	Specify max contract level to generate runtime checks for.
>   
>   fcontract-strict-declarations=
>   C++ Var(flag_contract_strict_declarations) Enum(on_off) Joined Init(0) RejectNegative
> @@ -1708,15 +1708,15 @@ C++ Var(flag_contract_mode) Enum(on_off)
>   -fcontract-mode=[on|off]	Enable or disable all contract facilities (default on).
>   
>   fcontract-continuation-mode=
> -C++ Joined
> +C++ Joined RejectNegative
>   -fcontract-continuation-mode=[on|off]	Enable or disable contract continuation mode (default off).
>   
>   fcontract-role=
> -C++ Joined
> +C++ Joined RejectNegative
>   -fcontract-role=<name>:<semantics>	Specify the semantics for all levels in a role (default, review), or a custom contract role with given semantics (ex: opt:assume,assume,assume)
>   
>   fcontract-semantic=
> -C++ Joined
> +C++ Joined RejectNegative
>   -fcontract-semantic=<level>:<semantic>	Specify the concrete semantics for level
>   
>   fcoroutines
> 
> 	Jakub
>