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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug other/89701] Provide -fcf-protection=branch,return
Date: Tue, 12 Jan 2021 09:04:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D89701

--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to Marek Polacek from comment #1)
> Confirmed.  While we support -fcf-protection=3Dbranch and
> -fcf-protection=3Dreturn,
> -fcf-protection=3Dbranch,return gives an error:
>=20
> xgcc: error: unknown Control-Flow Protection Level =E2=80=98branch,return=
=E2=80=99
> xgcc: note: valid arguments to =E2=80=98-fcf-protection=3D=E2=80=99 are: =
branch check full
> none retur

We can add a new EnumValue with string (branch,return) and value ({(enum
cf_protection_level) (CF_BRANCH | CF_RETURN)}) for this specific case,  but=
 the
implementation is too cumbersome considering the many permutations possible.

Another way is adding parser_cf_protection_options, called in
parse_sanitizer_options, decoding the string value and set corresponding bi=
t in
flag_cf_protection.=