re PR c++/88410 (internal compiler error: output_operand: invalid expression as operand)

	PR c++/88410
	* cp-gimplify.c (cp_fold) <case ADDR_EXPR>: For offsetof-like folding,
	call maybe_constant_value on val to see if it is INTEGER_CST.

	* g++.dg/cpp0x/pr88410.C: New test.

From-SVN: r267220

gcc/cp/ChangeLog

+2018-12-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/88410
+	* cp-gimplify.c (cp_fold) <case ADDR_EXPR>: For offsetof-like folding,
+	call maybe_constant_value on val to see if it is INTEGER_CST.
+
 2018-12-17  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR c++/52321

gcc/cp/cp-gimplify.c

@@ -2317,6 +2317,7 @@ cp_fold (tree x)
 	    {
 	      val = TREE_OPERAND (val, 0);
 	      STRIP_NOPS (val);
+	      val = maybe_constant_value (val);
 	      if (TREE_CODE (val) == INTEGER_CST)
 		return fold_offsetof (op0, TREE_TYPE (x));
 	    }

gcc/testsuite/ChangeLog

+2018-12-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/88410
+	* g++.dg/cpp0x/pr88410.C: New test.
+
 2018-12-17  Steve Ellcey  <sellcey@cavium.com>
 
 	* gcc.target/aarch64/torture/aarch64-torture.exp: New file.

gcc/testsuite/g++.dg/cpp0x/pr88410.C

+// PR c++/88410
+// { dg-do compile { target c++11 } }
+
+typedef __UINTPTR_TYPE__ uintptr_t;
+const uintptr_t a = 32;
+struct C { int b; int c; };
+uintptr_t d { uintptr_t (&reinterpret_cast<C *>(a)->c) - a };