Re: [boost] [math] Comeau can't match math::tools::fmod_workaround

Subject: Re: [boost] [math] Comeau can't match math::tools::fmod_workaround
From: John Maddock (john_at_[hidden])
Date: 2009-11-29 06:26:41

>> It's easy enough to disable long double support in Boost.Math, it's just
>> a case of working out what macros the std lib sets when it's not
>> available so we can hook into that.  Is __NO_LONG_DOUBLE_MATH defined
>> after including math.h by any chance?
>
> No, this macro is not defined.
>
> I contacted with Comeau team and, as they are always helpful, I've
> received a quick fix for this issue. It is possible to compile using
> Comeau with gcc/g++ compatibility mode [1] enabled.
>
> [1] http://www.comeaucomputing.com/4.3.0/minor/linux/compat.html
>
> In this mode g++ built-in functions are available, so it is possible to
> define missing fabs for Linux-specific configuration in which toolset
> includes Comeau frontend + GNU C++ compiler + GLIBC:
>
> #if defined(__linux__) && defined(__COMO__) \
> && defined(__GNUG__) && defined(__GLIBC__)
> namespace std {
>    inline long double fabs(long double value)
>       { return __builtin_fabsl(value); }
> }
> #endif
>
> I've confirmed using the simple test program that this option works.

Right, that could be a workaround for that one function, but isn't the whole 
lot of the long double functions missing?

John.