add a sample project

Twinkle/Base.xcconfig

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+//
+//  Base.xcconfig
+//
+//  Created by Patrick Piemonte on 3/26/13.
+//
+
+PRODUCT_NAME = $(TARGET_NAME)
+INFOPLIST_FILE = $(TARGET_NAME)/Info.plist
+WRAPPER_EXTENSION = app
+
+ARCHS[sdk=iphoneos*] = $(ARCHS_STANDARD_INCLUDING_64_BIT)
+IPHONEOS_DEPLOYMENT_TARGET = 8.0
+
+SKIP_INSTALL = NO
+
+DEAD_CODE_STRIPPING = YES;
+
+OTHER_CFLAGS = -fconstant-cfstrings
+DEBUG_INFORMATION_FORMAT = dwarf-with-dsym
+
+GCC_VERSION = com.apple.compilers.llvm.clang.1_0
+GCC_C_LANGUAGE_STANDARD = c99
+CLANG_CXX_LANGUAGE_STANDARD = c++11
+CLANG_CXX_LIBRARY = libc++
+
+GCC_PRECOMPILE_PREFIX_HEADER = YES
+GCC_PREFIX_HEADER = $(TARGET_NAME)/$(TARGET_NAME)-Prefix.pch
+
+CLANG_ENABLE_OBJC_ARC = YES
+
+GCC_DYNAMIC_NO_PIC = NO
+GCC_INLINES_ARE_PRIVATE_EXTERN = YES
+GCC_SYMBOLS_PRIVATE_EXTERN = NO
+
+CLANG_WARN__DUPLICATE_METHOD_MATCH = YES
+CLANG_WARN_EMPTY_BODY = YES
+CLANG_WARN_CONSTANT_CONVERSION = YES
+CLANG_WARN_ENUM_CONVERSION = YES
+CLANG_WARN_INT_CONVERSION = YES
+CLANG_WARN_BOOL_CONVERSION = YES
+
+GCC_ENABLE_OBJC_EXCEPTIONS = NO

Twinkle/Debug.xcconfig

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+//
+//  Debug.xcconfig
+//
+//  Created by Patrick Piemonte on 3/26/13.
+//
+
+#include "Base.xcconfig"
+
+GCC_OPTIMIZATION_LEVEL = 0
+GCC_PREPROCESSOR_DEFINITIONS = $(INHERITED) DEBUG=1
+
+GCC_TREAT_WARNINGS_AS_ERRORS = YES
+GCC_WARN_ABOUT_MISSING_PROTOTYPES[sdk=iphone*] = YES
+GCC_WARN_ABOUT_RETURN_TYPE = YES
+GCC_WARN_SHADOW[sdk=iphone*] = YES
+GCC_WARN_64_TO_32_BIT_CONVERSION = YES
+GCC_WARN_UNDECLARED_SELECTOR = YES
+GCC_WARN_UNINITIALIZED_AUTOS = YES
+GCC_WARN_ABOUT_DEPRECATED_FUNCTIONS = YES
+GCC_WARN_MULTIPLE_DEFINITION_TYPES_FOR_SELECTOR = YES
+GCC_WARN_CHECK_SWITCH_STATEMENTS = YES
+GCC_WARN_INITIALIZER_NOT_FULLY_BRACKETED = YES
+GCC_WARN_MISSING_PARENTHESES = YES
+GCC_WARN_ABOUT_MISSING_FIELD_INITIALIZERS = YES
+GCC_WARN_SIGN_COMPARE = YES
+GCC_WARN_ABOUT_MISSING_NEWLINE = YES
+GCC_WARN_UNUSED_VARIABLE = YES
+GCC_WARN_UNUSED_FUNCTION = YES
+GCC_WARN_UNUSED_LABEL = YES
+GCC_WARN_UNUSED_VALUE = YES
+GCC_WARN_UNUSED_VARIABLE = YES
+GCC_WARN_TYPECHECK_CALLS_TO_PRINTF = YES
+GCC_WARN_HIDDEN_VIRTUAL_FUNCTIONS = YES
+GCC_WARN_ABOUT_INVALID_OFFSETOF_MACRO = YES
+GCC_WARN_NON_VIRTUAL_DESTRUCTOR = YES
+
+CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES
+CLANG_WARN_OBJC_MISSING_PROPERTY_SYNTHESIS[sdk=iphone*] = YES
+CLANG_WARN_OBJC_EXPLICIT_OWNERSHIP_TYPE = YES
+CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES
+CLANG_WARN_IMPLICIT_SIGN_CONVERSION = YES
+
+CLANG_WARN_CXX0X_EXTENSIONS = NO
+
+CLANG_ANALYZER_SECURITY_INSECUREAPI_STRCPY = YES
+CLANG_ANALYZER_SECURITY_FLOATLOOPCOUNTER = YES
+
+ALWAYS_SEARCH_USER_PATHS = NO
+COPY_PHASE_STRIP = NO
+ONLY_ACTIVE_ARCH = YES
+
+OTHER_CFLAGS[sdk=iphone*] = $(OTHER_CFLAGS) -Wall -Wconversion -Wundeclared-selector -Wobjc-autosynthesis-property-ivar-name-match
+

Twinkle/Release.xcconfig

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+//
+//  Release.xcconfig
+//
+//  Created by Patrick Piemonte on 3/26/13.
+//
+
+#include "Base.xcconfig"
+
+GCC_OPTIMIZATION_LEVEL = s
+GCC_PREPROCESSOR_DEFINITIONS = _LIBCPP_VISIBLE= NDEBUG=1 NS_BLOCK_ASSERTIONS=1
+
+DEAD_CODE_STRIPPING = YES
+COPY_PHASE_STRIP = YES
+
+OTHER_CFLAGS[sdk=iphone*] = $(OTHER_CFLAGS) -DNS_BLOCK_ASSERTIONS=1
+
+VALIDATE_PRODUCT = YES