Library debug postfix might not be suitable for cross platform project, and usually require extra work of link against prebuilt yaml-cpp.
Generally, Xcode project output library to these directories:
Debug
Release
Debug-iphoneos
Release-iphoneos
Debug-iphonesimulator
Release-iphonesimulator
Another Xcode project usually configured its build setting as follow, and expects library name to be same between Release and Debug
LIBRARY_SEARCH_PATHS=$(CONFIGURATION)$(EFFECT_PLATFORM_NAME)
OTHER_LDFLAGS= $(inherited) -lyaml-cpp
