Reply to thread

Message: [QUOTE="Erik Trulsson, post: 2468926"] GCC knows about and has special handling for a large number of standard C functions (as well as a smaller number of functions that are not part of Standard C.) Since GCC knows how these functions are supposed to behave it can do extra optimizations as well as give extra warnings for them. Which functions it knows about is documented in the GCC manual (search for 'built-in functions'.) (GCC manuals can be found at [URL]http://gcc.gnu.org/onlinedocs/[/URL] ) Some other compilers do similar things. This is one reason it can be a very bad idea to try to define your own versions of standard functions, since the compiler might generate inlined code for the standard function and never generate a function call at all, or might do some other optimizations. [/QUOTE]