Prefix compile-time typedef checks with __attribute__((unused))

runtime/platform/assert.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef PLATFORM_ASSERT_H_
 #define PLATFORM_ASSERT_H_
 
 // TODO(5411406): include sstream for now, once we have a Utils::toString()
 // implemented for all the primitive types we can replace the usage of
 // sstream by Utils::toString()
@@ skipping 271 matching lines @@
 //   COMPILE_ASSERT(sizeof(foo) < 128, foo_too_large);
 //
 // The second argument to the macro is the name of the variable. If
 // the expression is false, most compilers will issue a warning/error
 // containing the name of the variable.
 
 template <bool>
 struct CompileAssert {
 };
 
-#define COMPILE_ASSERT(expr, msg)                       \
-  typedef CompileAssert<(static_cast<bool>(expr))>      \
+#define COMPILE_ASSERT(expr, msg)                                              \
+  DART_UNUSED typedef CompileAssert<(static_cast<bool>(expr))>                 \
   msg[static_cast<bool>(expr) ? 1 : -1]
 
 
 #if defined(TESTING)
 #define EXPECT(condition)                                                      \
   if (!(condition)) {                                                          \
     dart::Expect(__FILE__, __LINE__).Fail("expected: %s", #condition);         \
   }
 
 #define EXPECT_EQ(expected, actual)                                            \
@@ skipping 38 matching lines @@
 #define WARN(error)                                                           \
   dart::Expect(__FILE__, __LINE__).Fail("%s", error)
 
 #define WARN1(format, p1)                                                     \
   dart::Expect(__FILE__, __LINE__).Fail(format, (p1))
 
 #define WARN2(format, p1, p2)                                                 \
   dart::Expect(__FILE__, __LINE__).Fail(format, (p1), (p2))
 
 #endif  // PLATFORM_ASSERT_H_