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OK, "mostly useless" is an exaggeration, but I've never missed any of it except long long. But anyway, if the C compiler doesn't support it then it can't be used, so I avoid using those extensions. Perhaps I should write some header files to enable SAS/C to support snprintf(), stdint.h, etc. or has someone already done this?
>How can any code that you write today in C99 break backwards compatibility?
The auto keyword was redefined in a non-compatible way for C++ 11. However, researching further, that seems to only apply to C++, not C. (The two seem to be diverging in different directions, which is odd because one of the main advantages of C++ was supposed to be that it was a superset of C, which is becoming less true.)
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