https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90155

            Bug ID: 90155
           Summary: aarch64: too much quoting in diagnostic for %d
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: roland.illig at gmx dot de
  Target Milestone: ---

From aarch64.c:

  if (guard_size != probe_interval)
    error ("stack clash guard size %<%d%> must be equal to probing interval "
           "%<%d%>", guard_size, probe_interval);

https://gcc.gnu.org/onlinedocs/gccint/Guidelines-for-Diagnostics.html#Quoting
says:

> Other elements such as numbers that do not refer to numeric constants that 
> appear in the source code should not be quoted.

Therefore the %<quotes%> around the %d should be removed.

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