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The default is "unsigned" so i have choosen it for the platformfiles. This can be changed via a compiler option, but i am not sure if it makes sense to add all the platform files with "signed" also. Since the size of wchar_t depends on the compiler i added both possible variants respectively. Sizes of data types can be checked here for example: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0024a/ch08s02.html