[Bug debug/54533] breakpoint on C-style variadic function not hit at -O0 on amd64

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54533

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-09-09 07:01:52 UTC ---
I have seen a bug about this before but I cannot find it.  It only happen on
x86_64 as al tells the function if it uses floating point arguments or not.

It might be a bug in gdb in figuring out the prologue of the function too.