libstdc++.so.5 vs libstdc++.so.6

[Ian Lance Taylor]

danny payton <dannyx.payton@gmail.com> writes:

> I used g++ to compile an executable on an older Linux.
> ldd shows it is linked against libstdc++.so.5:
>
>         linux-gate.so.1 =>  (0xffffe000)
>         libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0xb7f29000)
>         libm.so.6 => /lib/tls/libm.so.6 (0xb7f04000)
>         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb7ef9000)
>         libc.so.6 => /lib/tls/libc.so.6 (0xb7dc7000)
>         /lib/ld-linux.so.2 (0x80000000)
>
> But I found that people with newer library cannot run it
> so I had to recompile my program to produce an alternate version
> like so:
>
>         linux-gate.so.1 =>  (0xffffe000)
>         libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb7e8d000)
>         libm.so.6 => /lib/tls/libm.so.6 (0xb7e68000)
>         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0xb7e5d000)
>         libc.so.6 => /lib/tls/libc.so.6 (0xb7d2b000)
>         /lib/ld-linux.so.2 (0x80000000)
>
> Is there a way to compile a C++ program using g++ so that it works
> with library versions ">=" some version number?

No.  Sorry.  Changes in the major version number indicate incompatible
code.

Ian