On Mon, 2010-10-04 at 06:14 -0400, Julian Foad wrote: > The NULL macro is intended for use as a pointer.
Only when statically cast to the appropriate pointer type. This happens automatically in many contexts, such as assignments or prototyped function parameters. But it does not happen automatically for variable parameters of a stdarg function. So apr_pstrcat(foo, bar, NULL) really is invalid C code. It's not a practical concern because common platforms use a single pointer representation, but it's a fair warning for a compiler to give. This message brought to you by Language Lawyers Inc.
