9d759c4e38
- limit the use of an asm optimisation for `std::sqrt()' to x86 archs, since it breaks the build everywhere else. - remove `-fopenmp' for base-gcc archs; it breaks the build on them - remove `-Wno-c++11-narrowing' from CXXFLAGS; no occurrence of it has been found, and such warning is notably useful for arm* and powerpc. Tested on sparc64 (kmos@), macppc and amd64 (me). OK kmos@