Add more warnings and analyzer flags.

Global.xcconfig

@@ -62,3 +62,55 @@ GCC_PREPROCESSOR_DEFINITIONS = $(inherited) $(XCODEBUILD_GCC_PREPROCESSOR_DEFINI
 // Standard ``import`` is used by tons of files and C++ code limits the possibility to use @import so we don't . => Disabled.
 
 WARNING_CFLAGS = -Weverything -Wno-objc-missing-property-synthesis -Wno-float-equal -Wno-pedantic -Wno-padded  -Wno-sign-conversion -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-auto-import
+
+
+// These are all partially (but not completely?) independent of WARNING_CFLAGS
+// and need to be specified explicitly.
+GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES
+GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES
+GCC_WARN_ABOUT_RETURN_TYPE = YES
+GCC_WARN_NON_VIRTUAL_DESTRUCTOR = YES
+GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS = YES
+GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES
+GCC_WARN_MISSING_PARENTHESES = YES
+GCC_WARN_CHECK_SWITCH_STATEMENTS = YES
+GCC_WARN_UNUSED_FUNCTION = YES
+GCC_WARN_UNUSED_LABEL = YES
+GCC_WARN_UNUSED_PARAMETER = YES
+GCC_WARN_UNUSED_VARIABLE = YES
+GCC_WARN_UNUSED_VALUE = YES
+GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE
+GCC_WARN_UNKNOWN_PRAGMAS = YES
+GCC_WARN_SHADOW = YES
+GCC_WARN_FOUR_CHARACTER_CONSTANTS = YES
+GCC_WARN_64_TO_32_BIT_CONVERSION = YES
+GCC_WARN_ABOUT_MISSING_NEWLINE = YES
+GCC_WARN_UNDECLARED_SELECTOR = YES
+GCC_WARN_ABOUT_INVALID_OFFSETOF_MACRO = YES
+CLANG_WARN__EXIT_TIME_DESTRUCTORS = YES
+CLANG_WARN_EMPTY_BODY = YES
+CLANG_WARN_CONSTANT_CONVERSION = YES
+CLANG_WARN_INT_CONVERSION = YES
+CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR
+CLANG_WARN_IMPLICIT_SIGN_CONVERSION = YES
+CLANG_WARN_CXX0X_EXTENSIONS = YES
+CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES
+CLANG_WARN_OBJC_EXPLICIT_OWNERSHIP_TYPE = YES
+CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES
+CLANG_WARN_OBJC_REPEATED_USE_OF_WEAK = YES
+CLANG_WARN_UNREACHABLE_CODE = YES
+CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR
+CLANG_WARN__DUPLICATE_METHOD_MATCH = YES
+CLANG_WARN_ENUM_CONVERSION = YES
+CLANG_WARN_BOOL_CONVERSION = YES
+CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES
+
+// Enable extra analyze modes
+CLANG_ANALYZER_SECURITY_FLOATLOOPCOUNTER = YES
+CLANG_ANALYZER_SECURITY_INSECUREAPI_RAND = YES
+CLANG_ANALYZER_SECURITY_INSECUREAPI_STRCPY = YES
+CLANG_ANALYZER_NONNULL = YES
+
+// Enable warnings-are-errors for all modes. Don't do this just yet.
+// SWIFT_TREAT_WARNINGS_AS_ERRORS = YES
+// GCC_TREAT_WARNINGS_AS_ERRORS = YES