PR c++/44648 - missing -Wunused warning on a const variable in if statement

gcc/testsuite/ChangeLog:
	* g++.dg/warn/Wunused-var-35.C: New test.

From-SVN: r268503

gcc/testsuite/ChangeLog

+2019-02-03  Martin Sebor  <msebor@redhat.com>
+
+	PR c++/44648
+	* g++.dg/warn/Wunused-var-35.C: New test.
+
 2019-02-03  Richard Biener  <rguenther@suse.de>
 
 	PR debug/87295

gcc/testsuite/g++.dg/warn/Wunused-var-35.C

+// PR c++/44648 - missing -Wunused warning on a const variable in if statement
+// { dg-do compile }
+// { dg-options "-Wunused" }
+
+int main()
+{
+  bool b0 = 1;           // { dg-warning "\\\[-Wunused-variable\\\]" }
+  const bool b00 = 1;    // { dg-warning "\\\[-Wunused-variable\\\]" }
+  if (bool b1 = 1)       // { dg-warning "\\\[-Wunused-variable\\\]" }
+    return 0;
+  else
+    return 1;
+
+  if (const bool b2 = 1) // { dg-warning "\\\[-Wunused-variable\\\]" "bug" { xfail c++98_only } }
+    return 0;
+  else
+    return 1;
+}
+