stdio.h patches for g++ -std=c++11

Fri May 9 10:01:00 GMT 2014

Le 09/05/2014 10:43, Corinna Vinschen a écrit :
> On May  9 07:52, zosrothko wrote:
>> Hi Corinna
>> I made a typo in my previous patch. Here the corrected one.
> Thanks.  Your patches are missing a matching ChangeLog entry, btw.
> However, on second thought I'm not sure that removing the 'i' variations
> of the functions from "__cplusplus >= 201103L" in this way is such a
> good idea.
> The 'i' functions are a newlib extension for embedded targets.
> They are not part of any standard, so they are certainly neither part
> of "__cplusplus >= 201103L", nor part of "__STDC_VERSION__ >= 199901L".
> So, either we remove these functions from both standards, or we include
> them in both standards.
> But if we remove them from both standards when will they be defined at
> all?  This should be cleared up before making this change.
> Is defining them with only
>    #if !defined(__STRICT_ANSI__)
> sufficient?
That won't work because of this

$ g++ -xc++ -std=c++11 -dM -E - < /dev/null | sort | grep ANSI
#define __STRICT_ANSI__ 1

$ g++ -xc++ -std=gnu++11 -dM -E - < /dev/null | sort | grep ANSI


g++ with -std=gnu++11 does not define __STRICT_ANSI__ while g++ -std=c++11 does and those previous printfs functions and only those should be defined for c++11. The other traditional stdio functions should be defined only for g++11 and for traditional C.

People that does not care about compliance will use the gnu++11 version while those that cares about compliance must use the c++11 version and so should be aligned the printfs series from stdio.h

Here at is described which functions borrowed from C are included in the new c++11 standard. I worked for now only on the stdio.h functions but all includes should be checked against the strict compliance for c++11.

> Corinna
> P.S.: For the time being, I removed the fcloseall function from this
>        declaration block and made its decalration dependent on
>        __GNU_VISIBLE.

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