https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70742
--- Comment #12 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- A script that assumes build = host = target is obviously unacceptable. You can't do any compilations for $target at all when configuring GCC, only when configuring its runtime libraries such as libgcc, because there may not be a pre-existing compiler for $target at all. You can grep target headers if they are available at configure time, but that's all, and they may not be available. I think you'd need to defer associating a declaration with a built-in function until after the declaration of div in a system header has been seen, at which point you have the header's declaration of div_t available (ISO C doesn't allow calling div without including the header that declares it). This delayed declaration does of course make it different from all existing built-in functions.
