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Re: [patch] Default to --enable-libstdcxx-time=auto
- From: Jakub Jelinek <jakub at redhat dot com>
- To: Rainer Orth <ro at CeBiTec dot Uni-Bielefeld dot DE>
- Cc: Jonathan Wakely <jwakely dot gcc at gmail dot com>, Benjamin Kosnik <bkoz at redhat dot com>, Paolo Carlini <paolo dot carlini at oracle dot com>, libstdc++ <libstdc++ at gcc dot gnu dot org>, gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Thu, 23 May 2013 23:06:11 +0200
- Subject: Re: [patch] Default to --enable-libstdcxx-time=auto
- References: <20130522111543 dot GG1377 at tucnak dot redhat dot com> <CAH6eHdR0MocSNhvD_xRfhcYiaGugs8P++oJnTyy5DSAiDh=hPg at mail dot gmail dot com> <20130522123540 dot GH1377 at tucnak dot redhat dot com> <20130523102827 dot GV1377 at tucnak dot redhat dot com> <CAH6eHdStnqrmWiWBioQLe53VCjMN-AC_56RW+Xnm=z0=pEDtxQ at mail dot gmail dot com> <20130523140218 dot GW1377 at tucnak dot redhat dot com> <20130523162611 dot GA1377 at tucnak dot redhat dot com> <yddbo81whlf dot fsf at CeBiTec dot Uni-Bielefeld dot DE> <20130523205022 dot GF1377 at tucnak dot redhat dot com> <ydd7gipwh3a dot fsf at CeBiTec dot Uni-Bielefeld dot DE>
- Reply-to: Jakub Jelinek <jakub at redhat dot com>
On Thu, May 23, 2013 at 10:56:25PM +0200, Rainer Orth wrote:
> >> I think std::chrono::steady_clock::now() needs to be protected with
> >> !(__sun__ && __svr4__) in GLIBCXX_3.4.17 since it only became available
> >> by default with Jonathan's patch.
> >
> > Ah, I see, gnu.ver has some
> > #ifdef HAVE_SYMVER_SYMBOL_RENAMING_RUNTIME_SUPPORT
> > #endif
> > guards there, does it work if you add it around the
> > GLIBCXX_3.4.17 std::chrono::steady_clock::now() definition?
>
> If I do so, I would probably get an abi_check failure: with your patch,
> std::chrono::steady_clock::now() ends up in GLIBCXX_3.4.19 while it
> should appear in GLIBCXX_3.4.20 since this is new in GCC 4.9.
In that case, either the --enable-libstdcxx-time=auto patch needs to be
backported to 4.8.1, or at least a small portion of it (do that auto thing
on Solaris only)?
Have steady_clock::now() as @GLIBCXX_3.4.17 + @@GLIBCXX_3.4.19 on Linux,
@@GLIBCXX_3.4.20 on Solaris, something else on other OSes would be quite
confusing.
> > Seems the solaris baseline_symbols.txt files don't meantion
> > this symbol, thus it wasn't exported before and thus the
> > compat definition there isn't really needed for Solaris.
>
> Right, it only got enable by defaulting --enable-libstdcxx-time to auto.
Jakub