Hi Ronald, I believe* all the operating system provided headers (such as the Standard C Library ones) expected to be #include'd (which uses the C protocol for the preprocessor), not #import'd (the ObjC protocol for the preprocessor). Using #import can interfere with their multi-include logic. The reason for the multi-include logic is historical/legacy, evolutionary, backwards compatibility, and also involves ISO 9899 standardization (both 1989 and 1999). And for some headers, which are more intimately tied to the operating system than the Standard C Library, there may be some POSIX (IEEE Std 1003) contortions as well or UNIX 2003 contortions. It's hard to please everyone. In theory, they could be made to be #import savvy as well, but those headers are really C headers, not ObjC headers. (Often they have allowances incorporated to be used as-is for C++. But C++ compilation units really should use <cstdarg> and <cstdio> rather than the raw C <stdarg.h> and <stdio.h> anyway.) HTH, --Eljay * I may be mistaken.
