> Wow. So this shortcoming harks back to the origin of time.
>
> Why was it not discovered before, do you think? No one ever tried it?
>
> Should we have a testcase for it? _Do_ we have a testcase for it?
I came to know about this recently when working with a build failure
of Cpython in AIX. Recently in Cpython, the -fstack-protector flag is
added and a compile
check (-c) is added in configure to check whether it is accepted or
not. In AIX , it
passes during the compile check, and hence the flag is carried forward
further but during the
binary/library creation, it fails. If it would have failed during the
compile check (-c) only, then the
configure would have dropped the flag there only.
# gcc -fstack-protector -c sample.c --> passes
# gcc -fstack-protector sample.c
collect2: fatal error: library libssp_nonshared not found
compilation terminated.
I am not sure whether we really need a testcase for this.
Thanks
Ayappan
On Tue, Sep 2, 2025 at 11:40 AM Segher Boessenkool
<seg...@kernel.crashing.org> wrote:
>
> On Tue, Sep 02, 2025 at 10:01:54AM +0530, Ayappan wrote:
> > All active releases I would say. That would be GCC 13, 14 and 15 if I am not
> > wrong.
>
> Wow. So this shortcoming harks back to the origin of time.
>
> Why was it not discovered before, do you think? No one ever tried it?
>
> Should we have a testcase for it? _Do_ we have a testcase for it?
>
>
> Segher
>
> p.s. Please do not top-post.
>
>
> > On Mon, Sep 1, 2025 at 10:11 PM Segher Boessenkool <[1]
> > seg...@kernel.crashing.org> wrote:
> >
> > On Mon, Sep 01, 2025 at 09:54:41PM +0530, Ayappan wrote:
> > > Yes, that would be really helpful.
> >
> > What release branches do you want this backported to, then? I cannot
> > (always) read minds :-)
> >
> >
> > Segher
> >
> >
> > > On Mon, Sep 1, 2025 at 9:31 PM Segher Boessenkool <[1]
> > > [2]seg...@kernel.crashing.org> wrote:
> > >
> > > Excellent. Thank you. Okay for trunk, as David said.
> > >
> > > Do you want backports for this?
> > >
> > >
> > > Segher
> > >
> > >
> > > On Mon, Sep 01, 2025 at 07:22:17PM +0530, Ayappan Perumal wrote:
> > > > From: Ayappan Perumal <[2][3]ayapp...@in.ibm.com>
> > > >
> > > > ---
> > > > stack-protector is not supported in GCC on AIX. This patch is to
> > fail the
> > > > compilation if -fstack-protector option is passed.
> > > >
> > > > gcc/config/rs6000/aix.h | 4 +++-
> > > > 1 file changed, 3 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/gcc/config/rs6000/aix.h b/gcc/config/rs6000/aix.h
> > > > index 9e7edbb2f22..c83eacefff4 100644
> > > > --- a/gcc/config/rs6000/aix.h
> > > > +++ b/gcc/config/rs6000/aix.h
> > > > @@ -281,4 +281,6 @@
> > > > #undef SUBTARGET_DRIVER_SELF_SPECS
> > > > #define SUBTARGET_DRIVER_SELF_SPECS \
> > > > "%{m64:-maix64} %<m64", \
> > > > -"%{m32:-maix32} %<m32"
> > > > +"%{m32:-maix32} %<m32", \
> > > > +"%{fstack-protector*: %<fstack-protector* \
> > > > + %estack-protector not supported on AIX}"
> > > > --
> > > > 2.41.0
> > >
> > >
> > > References:
> > >
> > > [1] mailto:[4]seg...@kernel.crashing.org
> > > [2] mailto:[5]ayapp...@in.ibm.com
> >
> >
> > References:
> >
> > [1] mailto:seg...@kernel.crashing.org
> > [2] mailto:seg...@kernel.crashing.org
> > [3] mailto:ayapp...@in.ibm.com
> > [4] mailto:seg...@kernel.crashing.org
> > [5] mailto:ayapp...@in.ibm.com
