file stream tellg/tellp and gcc-4.6 is this a bug?

Question

This code:

#include 
#include 
#include 
#include 

int main()
{   
    std::remove(\"test.txt\");         


        

Answer 1

I can confirm the difference. However, it is not a difference of the compiler, it is not a difference of the standard library headers, it is a difference of the linked shared library.

It doesn't depend on the gcc version. It doesn't depend on architecture:

t44:       ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped
t45:       ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped
t46:       ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped

The real difference seems to be

• meerkat: libstdc++6 4.5.1-7ubuntu2
• natty: libstdc++6 4.6.0-3~ppa1 (from here)

On ubuntu meerkat

$ uname -a
Linux natty 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 i686 GNU/Linux
$ for a in t4?; do ./$a; done
1
4 4
4 4
1
4 4
4 4
1
4 4
4 4

On ubuntu natty

Linux natty 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
sehe@natty:/mnt/jail/home/sehe$ for a in t4?; do ./$a; done
1
4 4
-1 4
1
4 4
-1 4
1
4 4
-1 4