__builtin_frame_address vs %esp in pt-machine.h

[Ulrich Drepper]

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Roland McGrath wrote:

> I don't understand this.  Its use is to check whether another frame's auto
> variable address might be below (off the top) of the current stack.


I've no time to think about the reason I had to make the change in the
moment.  But I added this code to fix a bug.  It is a necessary change.

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