warning: listing the stack pointer register 'esp' in a clobber list is deprecated

[Segher Boessenkool]

On Mon, May 27, 2019 at 06:36:18PM +0200, J.W. Jagersma wrote:
> I found that specifying "esp" in the clobber list forces the compiler to
> save a frame pointer and use ebp-based addressing instead.

The simple and reliable way of forcing a frame pointer is to write

	if (__builtin_frame_address(0)) {
		/* Force a frame pointer for this function.  */
	}


Segher