On 09/02/2014 08:33 AM, Joey Ye wrote: > On Sat, Aug 30, 2014 at 12:26 PM, Thomas Preud'homme > <thomas.preudho...@arm.com> wrote: >>> From: Grissiom [mailto:chaos.pro...@gmail.com] >>> Sent: Friday, August 29, 2014 11:51 PM >>> >>> Yes, it does. The namespace reserved for the implementation is _[_A-Z]. >> > The namespace _[a-z] is still available for the user. Which means the >>> user can declare their own _printf_float, and WE (as the implementation) >>> MUST NOT INTERFERE with it. Since WE are the implementation, we should >>> use the namespace reserved for us, namely __printf_float. >> >> Mmmh indeed. I checked C99 and section 7.1.3 paragraph 1 third clause states: >> >> "All identifiers that begin with an underscore and either an uppercase >> letter or >> another underscore are always reserved for any use." >> >> Next clause express how single underscore not followed by a capital letter is >> reserved: >> >> "All identifiers that begin with an underscore are always reserved for use >> as identifiers >> with file scope in both the ordinary and tag name spaces." > > Apparently newlib is not following this specification very well, as > there are symbols like _abc_r defined every where in current newlib.
newlib is part of the implementation, so it's allowed to do this. Andrew.
