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Date: Wed, 14 Nov 2018 12:22:00 -0000
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Jakub Jelinek <jakub@redhat.com>
Cc: Martin Sebor <msebor@gmail.com>, Gcc Patch List <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] diagnose unsupported uses of hardware register variables (PR 88000)
Message-ID: <20181114122250.GZ23873@gate.crashing.org>
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Btw, if you just add

void *
retsp (void)
{
  register void *sp __asm ("sp");
  asm ("" : "+g" (sp));  // <-- this line
  return sp;
}

everything works fine.


Segher