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Re: [patch] Default to --enable-libstdcxx-time=auto


Jakub Jelinek <jakub@redhat.com> writes:

> On Thu, May 23, 2013 at 11:54:05PM +0200, Rainer Orth wrote:
>> > Agreed, that seems the best course of action if that's an option.
>> 
>> I just remembered that we aren't there yet even on mainline:
>> 
>> * This snippet
>> 
>>   http://gcc.gnu.org/ml/gcc-patches/2013-05/msg01255.html
>> 
>>   is necessary to avoid bootstrap failure on Solaris 9.
>> 
>> * We'll need to link every C++ program with -lrt on Solaris, as
>>   mentioned in the same message.  I suppose the best way to do this is
>>   along the lines of libgfortran.spec, rather than duplicate the
>>   necessary configury between g++ and libstdc++.  This might prove
>>   pretty invasive for the testsuite, though, and delay the 4.8.1 release
>>   quite a bit.
>
> Ugh, that makes =auto pretty much unbackportable, but it seems Solaris is
> the only problematic OS here.  The goal of
> _ZNSt6chrono12steady_clock3nowEv@@GLIBCXX_3.4.19
> already in 4.8.1 was to allow Linux users (and with partial backport of
> =auto not including Solaris perhaps also FreeBSD/NetBSD/OpenBSD) to let
> users that get C++ core language feature completeness also use this
> (Jonathan/Benjamin, is that right?).

It occured to me that there might be a far less intrusive option to still
allow a Solaris backport: instead of going the libstdc++.spec route
(which I still think is the correct way forward), statically handle -lrt
addition in g++spec.c, controlled by a macro defined only in config/sol2.h.

Such a patch could be added to mainline and 4.8 branch now, and mainline
later changed to use libstdc++.spec instead.

	Rainer

-- 
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University


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