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

Hi Corinna
Le 05/05/2014 14:54, Corinna Vinschen a Ãcrit :

On May  2 19:14, zosrothko wrote:

This is a patch for exposing the new stdio functions added by the
c++11 standard. Without this patch the snprintf for example is not
exposed as

$ cat hello.cpp
#include <cstdio>

int main(int argc, char** argv) {
char buf[24];
snprintf(buf, 2, "", 2);
return 0;

$ g++ -std=c++11 hello.cpp
hello.cpp: In function âint main(int, char**)â:
hello.cpp:4:30: erreur: âsnprintfâ was not declared in this scope
snprintf("", 2, "", 2);

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

$ g++ -dM -E - < /dev/null | sort | grep ANSI


I applied a simpler patch which just enables the C99 printf/scanf
functions for C++11 using the already existing declaration block.
I have just checked out the stdio.h with the patch you made but IMO, it is not correct. the c++11 standard allows only the functions snprintf, vfscanf, vscanf, vsnprintf, and vsscanf. The patch you applied will allow all other functions from the existing declaration block. This patch will allow a c++ developper to use non standard c++11 functions which will preclude the portability of the code on another system where the strict adherence will be in place.

Thus, could you rollback your change and applies the original patch.




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