Annotate SK_COMPILE_ASSERT's typedef as permissibly unused, to fix GCC 4.8 build warning. Patch ori…

include/core/SkPostConfig.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPostConfig_DEFINED
@@ skipping 45 matching lines @@
 #endif
 
 #if !defined(SK_HAS_COMPILER_FEATURE)
     #if defined(__has_feature)
         #define SK_HAS_COMPILER_FEATURE(x) __has_feature(x)
     #else
         #define SK_HAS_COMPILER_FEATURE(x) 0
     #endif
 #endif
 
+#if !defined(SK_ATTRIBUTE)
+    #if defined(__clang__) || defined(__GNUC__)
+        #define SK_ATTRIBUTE(attr) __attribute__((attr))
+    #else
+        #define SK_ATTRIBUTE(attr)
+    #endif
+#endif
+
 #if !defined(SK_SUPPORT_GPU)
     #define SK_SUPPORT_GPU 1
 #endif
 
 /**
  * The clang static analyzer likes to know that when the program is not
  * expected to continue (crash, assertion failure, etc). It will notice that
  * some combination of parameters lead to a function call that does not return.
  * It can then make appropriate assumptions about the parameters in code
  * executed only if the non-returning function was *not* called.
@@ skipping 271 matching lines @@
             #endif
         #endif
     #else
         // Linux GCC ignores "__attribute__((override))" and rejects "override".
         #define SK_OVERRIDE
     #endif
 #endif
 
 //////////////////////////////////////////////////////////////////////
 
+#if !defined(SK_UNUSED)
+    #define SK_UNUSED SK_ATTRIBUTE(unused)
+#endif
+
+//////////////////////////////////////////////////////////////////////
+
 #ifndef SK_PRINTF_LIKE
 #if defined(__clang__) || defined(__GNUC__)
 #define SK_PRINTF_LIKE(A, B) __attribute__((format(printf, (A), (B))))
 #else
 #define SK_PRINTF_LIKE(A, B)
 #endif
 #endif
 
 //////////////////////////////////////////////////////////////////////
 
 #ifndef SK_SIZE_T_SPECIFIER
 #if defined(_MSC_VER)
 #define SK_SIZE_T_SPECIFIER "%Iu"
 #else
 #define SK_SIZE_T_SPECIFIER "%zu"
 #endif
 #endif
 
 //////////////////////////////////////////////////////////////////////
 
 #ifndef SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
 #define SK_ALLOW_STATIC_GLOBAL_INITIALIZERS 1
 #endif