[PATCH] Update documents for fcf-protection=

[PATCH] Update documents for fcf-protection=

[liuhongt]

After r14-2692-g1c6231c05bdcca, the option is defined as EnumSet and
-fcf-protection=branch won't unset any others bits since they're in
different groups. So to override -fcf-protection, an explicit
-fcf-protection=none needs to be added and then with
-fcf-protection=XXX

Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
Ok for trunk?

gcc/ChangeLog:

	* doc/invoke.texi (fcf-protection=): Update documents.
---
 gcc/doc/invoke.texi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 68d1f364ac0..d1e6fafb98c 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -17734,6 +17734,9 @@ function.  The value @code{full} is an alias for specifying both
 @code{branch} and @code{return}. The value @code{none} turns off
 instrumentation.
 
+To override @option{-fcf-protection}, @option{-fcf-protection=none}
+needs to be explicitly added and then with @option{-fcf-protection=xxx}.
+
 The value @code{check} is used for the final link with link-time
 optimization (LTO).  An error is issued if LTO object files are
 compiled with different @option{-fcf-protection} values.  The
-- 
2.31.1

Re: [PATCH] Update documents for fcf-protection=

[H.J. Lu]

On Tue, Jan 9, 2024 at 6:02 PM liuhongt <hongtao.liu@intel.com> wrote:
>
> After r14-2692-g1c6231c05bdcca, the option is defined as EnumSet and
> -fcf-protection=branch won't unset any others bits since they're in
> different groups. So to override -fcf-protection, an explicit
> -fcf-protection=none needs to be added and then with
> -fcf-protection=XXX
>
> Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
> Ok for trunk?
>
> gcc/ChangeLog:

We should mention:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113039

>         * doc/invoke.texi (fcf-protection=): Update documents.
> ---
>  gcc/doc/invoke.texi | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
> index 68d1f364ac0..d1e6fafb98c 100644
> --- a/gcc/doc/invoke.texi
> +++ b/gcc/doc/invoke.texi
> @@ -17734,6 +17734,9 @@ function.  The value @code{full} is an alias for specifying both
>  @code{branch} and @code{return}. The value @code{none} turns off
>  instrumentation.
>
> +To override @option{-fcf-protection}, @option{-fcf-protection=none}
> +needs to be explicitly added and then with @option{-fcf-protection=xxx}.
> +
>  The value @code{check} is used for the final link with link-time
>  optimization (LTO).  An error is issued if LTO object files are
>  compiled with different @option{-fcf-protection} values.  The
> --
> 2.31.1
>


-- 
H.J.

Re: [PATCH] Update documents for fcf-protection=

[Hongtao Liu]

On Thu, Jan 11, 2024 at 12:06 AM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> On Tue, Jan 9, 2024 at 6:02 PM liuhongt <hongtao.liu@intel.com> wrote:
> >
> > After r14-2692-g1c6231c05bdcca, the option is defined as EnumSet and
> > -fcf-protection=branch won't unset any others bits since they're in
> > different groups. So to override -fcf-protection, an explicit
> > -fcf-protection=none needs to be added and then with
> > -fcf-protection=XXX
> >
> > Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
> > Ok for trunk?
> >
> > gcc/ChangeLog:
>
> We should mention:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113039
Changed, and committed.
>
> >         * doc/invoke.texi (fcf-protection=): Update documents.
> > ---
> >  gcc/doc/invoke.texi | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
> > index 68d1f364ac0..d1e6fafb98c 100644
> > --- a/gcc/doc/invoke.texi
> > +++ b/gcc/doc/invoke.texi
> > @@ -17734,6 +17734,9 @@ function.  The value @code{full} is an alias for specifying both
> >  @code{branch} and @code{return}. The value @code{none} turns off
> >  instrumentation.
> >
> > +To override @option{-fcf-protection}, @option{-fcf-protection=none}
> > +needs to be explicitly added and then with @option{-fcf-protection=xxx}.
> > +
> >  The value @code{check} is used for the final link with link-time
> >  optimization (LTO).  An error is issued if LTO object files are
> >  compiled with different @option{-fcf-protection} values.  The
> > --
> > 2.31.1
> >
>
>
> --
> H.J.



-- 
BR,
Hongtao