This pulls in mvujovic's build fix in WebKit ANGLE.

src/common/version.h

 #define MAJOR_VERSION 1
 #define MINOR_VERSION 0
 #define BUILD_VERSION 0
-#define BUILD_REVISION 1830
+#define BUILD_REVISION 1831
 
 #define STRINGIFY(x) #x
 #define MACRO_STRINGIFY(x) STRINGIFY(x)

src/compiler/preprocessor/ExpressionParser.cpp

@@ -84,13 +84,12 @@
 // This file is auto-generated by generate_parser.sh. DO NOT EDIT!
 
 #if defined(__GNUC__)
-#pragma GCC diagnostic ignored "-Wunknown-pragmas"
 // Triggered by the auto-generated pplval variable.
-#pragma GCC diagnostic ignored "-Wuninitialized"
-#if ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
+#if !defined(__clang__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#else
+#pragma GCC diagnostic ignored "-Wuninitialized"
 #endif
-#pragma GCC diagnostic warning "-Wunknown-pragmas"
 #elif defined(_MSC_VER)
 #pragma warning(disable: 4065 4701)
 #endif

src/compiler/preprocessor/ExpressionParser.y

@@ -21,13 +21,12 @@ WHICH GENERATES THE GLSL ES preprocessor expression parser.
 // This file is auto-generated by generate_parser.sh. DO NOT EDIT!
 
 #if defined(__GNUC__)
-#pragma GCC diagnostic ignored "-Wunknown-pragmas"
 // Triggered by the auto-generated pplval variable.
-#pragma GCC diagnostic ignored "-Wuninitialized"
-#if ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
+#if !defined(__clang__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
 #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#else
+#pragma GCC diagnostic ignored "-Wuninitialized"
 #endif
-#pragma GCC diagnostic warning "-Wunknown-pragmas"
 #elif defined(_MSC_VER)
 #pragma warning(disable: 4065 4701)
 #endif