https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115907
--- Comment #13 from cqwrteur <unlvsur at live dot com> ---
(In reply to cqwrteur from comment #12)
> (In reply to Andrew Pinski from comment #6)
> > There is NO fix inside gcc/libstdc++.
> > THe only fix is your build of GCC (which includes the target libraries)
> > needs to be build against the oldest version of glibc you support. This is
> > something which GCC cannot control.
> > THIS IS HOW linking and backwards compatibility works.
>
> Also if you don't think this is a bug. Explain this to me. Why C++ will use
> __isoc23_sscanf but C does not?
>
> #include <features.h>
> #include <stdio.h>
>
> int main() {
> const char *input = "42 Alice";
> int number;
>
> int result = sscanf(input, "%d", &number);
>
> printf("Parsed number: %d\n", number);
>
> }
>
> g++ -S hello.cc -std=c++11
> g++ -S hello.cc -std=c++14
> g++ -S hello.cc -std=c++17
> g++ -S hello.cc -std=c++20
> g++ -S hello.cc -std=c++23
>
> Why they all use __isoc23_sscanf in the latest glibc 2.40.
>
> If we compile it with gcc
>
> gcc -S hello.c -std=c11
> gcc -S hello.c -std=c14
> gcc -S hello.c -std=c18
> gcc -S hello.c -std=c23
> Only C23 uses __isoc23_sscanf.
>
> It does not make any sense tbh.
C++98 uses scanf. every other C++ standard else uses __isoc23_sscanf. Only C23
uses __isoc23_sscanf while every other C standard, including c18 uses
__isoc99_sscanf. I am using the same GCC 15 toolchain. Why? This is just a bug.
Nothing more.
