Add ANGLE_NO_EXCEPTIONS macro

src/common/angleutils.h

@@ -21,6 +21,17 @@
   TypeName(const TypeName&);               \
   void operator=(const TypeName&)
 
+// Macros for writing try catch blocks. Defining ANGLE_NO_EXCEPTIONS
+// when building angle will disable the usage of try/catch for compilers
+// without proper support for them (such as clang-cl).
+#ifdef ANGLE_NO_EXCEPTIONS
+#define ANGLE_TRY if (true)
+#define ANGLE_CATCH_ALL else
+#else
+#define ANGLE_TRY try
+#define ANGLE_CATCH_ALL catch(...)
+#endif
+
 template <typename T, unsigned int N>
 inline unsigned int ArraySize(T(&)[N])
 {