PING^2: [PATCH v2] Update __stack_chk_guard documentation

On Tue, Jun 30, 2026 at 7:36 AM H.J. Lu <[email protected]> wrote:
>
> On Wed, Jun 17, 2026 at 6:44 AM H.J. Lu <[email protected]> wrote:
> >
> > Documentation of __stack_chk_guard
> >
> > @deftypefn {Target Hook} tree TARGET_STACK_PROTECT_GUARD (void)
> > This hook returns a @code{DECL} node for the external variable to use
> > for the stack protection guard.  This variable is initialized by the
> > runtime to some random value and is used to initialize the guard value
> > that is placed at the top of the local stack frame.  The type of this
> > variable must be @code{ptr_type_node}.
> >
> > The default version of this hook creates a variable called
> > @samp{__stack_chk_guard}, which is normally defined in @file{libgcc2.c}.
> > @end deftypefn
> >
> > was added by
> >
> > commit 7d69de618e732d343228a07d797a30e39a6363f4
> > Author:     Richard Henderson <[email protected]>
> > AuthorDate: Mon Jun 27 00:41:16 2005 -0700
> > Commit:     Jakub Jelinek <[email protected]>
> > CommitDate: Mon Jun 27 09:41:16 2005 +0200
> >
> >     c-cppbuiltin.c (c_cpp_builtins): Add __SSP_ALL__ and __SSP__.
> >
> > __stack_chk_guard was moved to libssp later by
> >
> > commit 77008252819720c987f11b3dade670e2b3ba09b8
> > Author:     Jakub Jelinek <[email protected]>
> > AuthorDate: Sat Jul 2 10:52:21 2005 +0200
> > Commit:     Jakub Jelinek <[email protected]>
> > CommitDate: Sat Jul 2 10:52:21 2005 +0200
> >
> >     Makefile.def (target_modules): Add libssp.
> >
> > Its documentation became stale.  Update __stack_chk_guard type to
> > uintptr_t if it is a global symbol and its normal location to libssp.
> >
> > PR libgcc/125190
> > * target.def (stack_protect_guard): __stack_chk_guard type is
> > uintptr_t if it is a global symbol.  It is normally defined in
> > libssp.
> > (stack_protect_guard_symbol_p): It is in libssp.
> > * targhooks.cc (stack_chk_guard_decl): Likewise.
> > * doc/tm.texi: Regenerated.
> >
> >
> > --
> > H.J.
>
> PING:
>
> https://patchwork.sourceware.org/project/gcc/patch/CAMe9rOpjnr5oRMXpKze3CPHQJjOAUT7yPTQ8rxnNWpyjP_MncA@mail.gmail.com/
>
> --
> H.J.



-- 
H.J.