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

[Rainer Orth]

Jakub Jelinek <jakub@redhat.com> writes:

> On Thu, May 23, 2013 at 04:02:18PM +0200, Jakub Jelinek wrote:
>> So, here is an untested 4.8 branch patch.  The @GLIBCXX_3.4.17 +
>> @@GLIBCXX_3.4.19 stuff gets ugly, I admit, but don't have other solution.
>> Tested just that it compiles/links, abi list looks good and abi.exp testing,
>> haven't actually tried to test it more than that.
>
> Now fully bootstrapped/regtested on x86_64-linux and i686-linux.

This patch breaks Solaris bootstrap:

ld: fatal: libstdc++-symbols.ver-sun: 4423: symbol 'std::chrono::steady_clock::now()' is already defined in file: libstdc++-symbols.ver-sun: symbol version conflict
collect2: error: ld returned 1 exit status
make[6]: *** [libstdc++.la] Error 1

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.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University