Re: using __float128 and -std=c++11

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On 2015-10-13 11:31, Marc Glisse wrote:
On Tue, 13 Oct 2015, Peter van Hoof wrote:

Consider the following program

#include <quadmath.h>
__float128 a()
{
    return FLT128_MAX;
}

When I compile this with any of these commands

g++ -c prog.cc
g++ -std=c++98 -c prog.cc
g++ -std=c++03 -c prog.cc

it compiles just fine. However, when I use this

g++ -std=c++11 -c prog.cc

I get the error message

In file included from prog.cc:1:0:
prog.cc: In function ‘__float128 a()’:
prog.cc:5:9: error: unable to find numeric literal operator
‘operator"" Q’
 return FLT128_MAX;
        ^
I suspect this is a compiler bug, but would like to double-check first
before submitting a report. The compiler doesn't complain about the
use of __float128, so I guess that type is deemed compliant with the
C++11 standard. So I would assume that I should also be allowed to use
__float128 literals...

A more recent version of the compiler should give you a hint about using
gnu++11 instead (or some other flag I have forgotten).

So this is the intended behavior. Thanks for the quick reply!



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