Re: [boost] [math][Sunpro] Can anyone help porting to Sun'scompiler?

From: Simon Atanasyan (atanasyan_at_[hidden])
Date: 2007-10-11 14:04:35

2007/10/11, John Maddock <john_at_[hidden]>:
> Simon Atanasyan wrote:
> >> The gcc results on that platform are pretty good, so it seems a
> >> shame not to support Sun as well, anyone have ideas?
> >
> > Probably this is a bug in Sun C++. I will take a look on it.
>
> Thanks Simon, if there's a workaround possible for the existing Sun releases
> that would be great.

Good news - the latest version of Sun C++ works good. This version of
the compiler even does not need "Sun related" workaround in the
boost/math/concepts/real_concept.hpp (lines 334-338).

% CC -V
CC: Sun C++ 5.9 SunOS_sparc Patch 124863-01 2007/07/25

Bad news - all other version of Sun C++ have a bug. Compiler cannot
deduce a type of template parameter for the template specialization
based on function return type. Here is test case for this bug:

% cat test.cc
template <class T>
T f()
{
    return T();
}

template <>
float f()
{
    return 1.0;
}

int main()
{
    f<float>();
}

% CC -c test.cc
"test.cc", line 9: Error: Could not find a match for f<T>().
"test.cc", line 15: Error: Could not find a match for f<T>() needed in main().
2 Error(s) detected.

A possible workaround is to add unused argument that helps compiler to
handle template specialization: Following code works good:

template <class T>
T f(T* = 0)
{
    return T();
}

template <>
float f(float*)
{
    return 1.0;
}

int main()
{
    f<float>();
}

-- 
Simon Atanasyan