[patch][4.5] Backport Mach-O LTO support

[Richard Guenther]

On Thu, Jun 24, 2010 at 11:06 PM, Jack Howarth <howarth@bromo.med.uc.edu> wrote:
> On Thu, Jun 24, 2010 at 10:53:46PM +0200, Richard Guenther wrote:
>> On Thu, Jun 24, 2010 at 10:50 PM, Steven Bosscher <stevenb.gcc@gmail.com> wrote:
>> > On Thu, Jun 24, 2010 at 10:26 PM, Richard Guenther
>> > <richard.guenther@gmail.com> wrote:
>> >> On Thu, Jun 24, 2010 at 9:38 PM, Steven Bosscher <stevenb.gcc@gmail.com> wrote:
>> >>> Hi,
>> >>>
>> >>> Pretty straight-forward port of the patches from trunk to gcc 4.5.1.
>> >>> There are new test suite failures if configured with --enable-lto but
>> >>> those are the same as on trunk (where some test cases have been
>> >>> patched to xfail ELF-isms in the lto test suite).
>> >>>
>> >>> Bootstrapped & tested on x86_64-unknown-linux-gnu. OK for GCC 4.5?
>> >>
>> >> Ok.  Can you amend gcc-4.5/changes.html (adding a GCC 4.5.1 section
>> >> like we have for previous releases)?
>> >
>> > Sure. Like so?
>>
>> Looks good to me!
>>
>> Thanks,
>> Richard.
>
> On a somewhat different subject, is there going to be attempt to
> identify all of the LTO fixes in gcc trunk that are suitable for
> backporting to gcc 4.5 branch (outside of the -fwhopr related ones)?
> I noticed that gcc 4.5 branch ICEs on some fortran code with -flto
> but not gcc trunk. It would be nice to have any fixes for ICEs
> with -flto backported if feasible.

I did backport all obvious and safe stuff.  If I missed something
then I'd appreciate a pointer.

Richard.

>                  Jack
>
>>
>> > Index: changes.html
>> > ===================================================================
>> > RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.5/changes.html,v
>> > retrieving revision 1.91
>> > diff -u -r1.91 changes.html
>> > --- changes.html        6 Jun 2010 13:36:29 -0000       1.91
>> > +++ changes.html        24 Jun 2010 20:50:08 -0000
>> > @@ -832,6 +832,23 @@
>> >     </li>
>> >   </ul>
>> >
>> > +<h2><a name="4.5.1">GCC 4.5.1</a></h2>
>> > +
>> > +<h3>All languages</h3>
>> > +  <ul>
>> > +    <li><p>GCC's new link-time optimizer (<code><a
>> > +    href="http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-flto-801"
>> > +    >-flto</a></code>) now also works on a few non-ELF targets:</p>
>> > +
>> > +    <ul>
>> > +      <li>Cygwin (*-cygwin*)</li>
>> > +      <li>MinGW (*-mingw*)</li>
>> > +      <li>Darwin on x86-64 (x86_64-apple-darwin*)</li>
>> > +    <ul>
>> > +
>> > +    <p>LTO is not enabled by default for these targets.  To enable LTO,
>> > +    you should configure with the <code>--enable-lto</code> option.</p>
>> > +  </ul>
>> >
>> >  </body>
>> >  </html>
>> >
>