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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/102681] [12 Regression] AArch64 bootstrap failure
Date: Mon, 11 Oct 2021 16:35:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102681

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Simply initializing the variable as in the patch below avoids the warning. =
 The
control flow in the code is sufficiently opaque to make it worthwhile from a
readability point irrespective of whether or not the variable can, in fact,=
 be
used uninitialized.

index e50d3fc3b62..c7f0a405ff6 100644
--- a/gcc/calls.c
+++ b/gcc/calls.c
@@ -199,7 +199,7 @@ stack_region_maybe_used_p (poly_uint64 lower_bound,
poly_uint64 upper_bound,
 static void
 mark_stack_region_used (poly_uint64 lower_bound, poly_uint64 upper_bound)
 {
-  unsigned HOST_WIDE_INT const_lower, const_upper;
+  unsigned HOST_WIDE_INT const_lower, const_upper =3D 0;
   const_lower =3D constant_lower_bound (lower_bound);
   if (upper_bound.is_constant (&const_upper))
     for (unsigned HOST_WIDE_INT i =3D const_lower; i < const_upper; ++i)=