[Patch draft] Fix libstdc++/8610

[Andreas Jaeger]

Paolo Carlini <pcarlini@unitus.it> writes:

> Andreas Jaeger wrote:
>
>>Are we compiling with -D_GNU_SOURCE ?  I think we do - and therefore
>>it works in libstdc++.  If _GNU_SOURCE is set, we do not eed the
>>LARGEFILE64_SOURCE.  But the latter might be needed for other
>>platforms.
>>
> Indeed, we are. Thanks for your enlightening observation.
> If, instead, I do:
>
> paolo:~> g++ -U_GNU_SOURCE no-proto.cc
> no-proto.cc: In function `int main()':
> no-proto.cc:5: error: `lseek64' undeclared (first use this function)
> no-proto.cc:5: error: (Each undeclared identifier is reported only
> once for each function it appears in.)
>
> However, I'm not sure to understand what you mean by "other platforms":

Non-glibc platforms, e.g. AIX, Solaris, or platforms using newlib.

> I mean, libstdc++-v3 only comes with the corresponding g++, cannot be
> used stand alone.
>
> Another (reassurring) data point: you cannot actually use v3 with
> -U_GNU_SOURCE: *many* things break well before lseek64 ;)

Ok ;-)

Andreas
-- 
 Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj
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