Recently GCC moved to make this an hard error by default in >=C99 mode. There was huge push back form some very vocal members of the community against such exot

Recently GCC moved to make this an hard error by default in >=C99 mode. There was huge push back form some very vocal members of the community against such exoteric, bleeding edge type system non-sense like function prototypes; according to them having to add -pedantic to the gcc command-line to build legacy code is an unreasonable breaking change. The burden should be on beginners to find the correct GCC arguments to enable all the "useless" warning. Thankfully GCC is going ahead with the change anyway.