Re: new module 'floorl'

[Bruno Haible]

Paolo Bonzini wrote:
> >   - In math.h, do a "#define floorl rpl_floorl", in order to avoid
> >     possible undesired compiler optimizations.
> 
> No problem, but I wonder what's the rationale for the last item.

It's that I've seen gcc transform some trunc() calls into truncf() calls
or similar. If gnulib provides a trunc() substitute, it will set TRUNC_LIBM
to empty, thus a program should be able to use trunc() and not link with libm.
If gcc has turned the trunc() into truncf() in some special cases, the user
will get a link error.

Bruno