c++: ICE with reinterpret_cast and switch [PR113545]

[thirdparty/gcc.git] / gcc / cp / constexpr.cc

diff --git a/gcc/cp/constexpr.cc b/gcc/cp/constexpr.cc
index 2ebb1470dd5e644e72a1c3303898f0b8f268d00b..fa346fe01c9c67afa655394fcf151eb65e90cfaa 100644 (file)
--- a/gcc/cp/constexpr.cc
+++ b/gcc/cp/constexpr.cc
@@ -7106,6 +7106,16 @@ cxx_eval_switch_expr (const constexpr_ctx *ctx, tree t,
   cond = cxx_eval_constant_expression (ctx, cond, vc_prvalue,
                                       non_constant_p, overflow_p);
   VERIFY_CONSTANT (cond);
+  if (TREE_CODE (cond) != INTEGER_CST)
+    {
+      /* If the condition doesn't reduce to an INTEGER_CST it isn't a usable
+        switch condition even if it's constant enough for other things
+        (c++/113545).  */
+      gcc_checking_assert (ctx->quiet);
+      *non_constant_p = true;
+      return t;
+    }
+
   *jump_target = cond;
 
   tree body