Comment 2 for bug 889984

Generally speaking, GDB does not distinguish "helper functions from libgcc" in any particular way.

Default behaviour when using "step" on a function call site is: if the called function has debug information, step into it; if it does not, then step over it.

So if your expected behaviour is to step over libgcc helpers, then the way to achieve that is to remove (or not install) debug information for libgcc ...