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TI c6000, -pr option, relaxed Ansi

We're using the TI c60000 compiler for an imaging product.  We would like to use variadic macros, but they are not supported in ISO C standard.  We can use the -pr option (relaxed ansi) to work around this, but I'm concerned if this might introduce any side affects.  We are a week from releasing and I am heistant to change any of our compiler optons.  

So the question is: What does the -pr option change besides variadic macros?  Is there a list of C/C++ language items this affects?  I didn't find anyting when I searched the forums and wiki.

Thanks in advance,

Dean Gereaux, Wintriss Engineering