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From: "vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug exp/26875] Incorrect value printed for address of first element
 of zero-length array
Date: Fri, 13 Nov 2020 10:33:44 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D26875

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Tentative patch (not taking side-effects into account yet):
...
diff --git a/gdb/eval.c b/gdb/eval.c
index 8d0c5747f39..69262340c8f 100644
--- a/gdb/eval.c
+++ b/gdb/eval.c
@@ -2814,6 +2814,18 @@ evaluate_subexp_for_address (struct expression *exp,=
 int
*pos,


   switch (op)
     {
+    case BINOP_SUBSCRIPT:
+      {
+       int pos_base =3D *pos + 1;
+       struct value *base
+         =3D evaluate_subexp (nullptr, exp, &pos_base, noside);
+       int pos_index =3D pos_base;
+       struct value * index
+         =3D evaluate_subexp (nullptr, exp, &pos_index, noside);
+       if (value_equal (index, value_zero (value_type (index), not_lval)))
+         return base;
+      }
+      goto default_case;
     case UNOP_IND:
       (*pos)++;
       x =3D evaluate_subexp (nullptr, exp, pos, noside);
...

--=20
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