Hi Vincent, > In fact, -march solved the problem, and after all, it's not abnormal > that a later gcc version generates less efficient code if the > architecture is incorrect. Now, I thought that gcc would have used > sensible default values (I couldn't find anything in the manual about > the default architecture). I think the value used is the one specified when GCC is built. If the builder does not specify an architecture explicitly, then the lowest common denominator for that platform is used (typically). That's the safest assumption for configure. HTH, --Eljay
