[Bug target/54686] std::abs (long long) resorts to std::abs (double) if llabs is absent

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54686

--- Comment #13 from Marc Glisse <glisse at gcc dot gnu.org> 2012-09-23 22:21:35 UTC ---
Created attachment 28256
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28256
always define abs(long long)

This is what I had in mind (this abs(long long) is not a fallback, that's the
only implementation there is currently). Completely untested.

Oleg, do you want to experiment with something like that?