* Jakub Jelinek: > On Wed, Jan 24, 2018 at 03:04:55PM +0100, Manuel Rigger wrote: >> In a second step, we also considered internal builtins and found that the >> vararg handling builtins (__builtin_va_start, __builtin_va_end, >> __builtin_va_arg, and __builtin_va_copy) are relied upon by many projects, >> even though they are undocumented in GCC's builtins API. Could they be >> added to the documentation? > > Why? What is documented is va_start/va_end/va_arg/va_copy, that is > what people should use, the builtins are just internal implementation of > those macros.
And these builtins differ from the math builtins because <stdarg.h> is provided by GCC, but <math.h> is not, and there are many different implementations.
