[PATCHv2 0/1] Enable PAC and BTI for AArch64

[Niels Möller]

Bill Roberts <bill.roberts at arm.com> writes:

> This moves the generation of the m4 defines into the autoconf system
> (hats off to whomever built that for GMP)

I think much of the credit should go to Kevin Ryde and Linus Nordberg
(who aren't currently active in GMP development).

Instead of adding 

  ADD_GNU_NOTES_IF_NEEDED

to all assembly files, you could use m4 divert. Something like adding

  divert(1)
  ADD_GNU_NOTES_IF_NEEDED
  divert

to mpn/arm64/arm64-defs.m4. (It could potentially also go in the more
general mpn/asm-defs.m4, if we want to use the same facility of other
kinds of notes). That's what I do in nettle, in this file:

  https://git.lysator.liu.se/nettle/nettle/-/blob/master/config.m4.in

/nisse

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