https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70722
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- As discussed when I introduced #include_next into <cmath>, if Firefox wants to play games redefining system headers (which is explicitly undefined behaviour according to the C++ standard) then it is Firefox's problem to make it work, not ours. This is documented at https://gcc.gnu.org/gcc-6/porting_to.html Programs which provide their own wrappers for <stdlib.h> or other standard headers are operating outside the standard and so are responsible for ensuring their headers work correctly with the headers in the C++ standard library.
