Re: BUG -- Apps made on FC5 (GCC 4.1.1) do NOT run on FC3 (GCC 4.0.2)

[Ignoramus20785]

Paul, thanks a lot, I will try approach [1] first. It will take ma few
hours as I need to recompile a lot of stuff on a busy obsolete
computer. I will post an update. Thank you.,

i

On Wed, 31 Jan 2007 07:26:27 -0800, Paul Pluzhnikov 
<ppluzhnikov-nsp@charter.net> wrote:
> Ignoramus20785 <ignoramus20785@NOSPAM.20785.invalid> writes:
>
>> We have an app that we compile on FC5 (Fedora Core 5) using g++ from
>> GCC 4.1.1.
>>
>> When we copy our app to a FC3 server, to run it, we get this error: 
>
> This is expected.
>
> Unlike Win32, UNIX systems generally support *only* backward
> compatibility: programs compiled on an older system continue to run
> on a newer one (i.e. compile on FC3, run on FC5, and it will work).
>
>> What can I do to get C++ apps compiled on FC5 to run on FC3?
>
> The answer is: compile on the lowest OS release instead.
>
> If there is a good reason why you can't, then you have to get rid
> of libstdc++.so.6 and libgcc_s.so.1 dependency [1], or you have to
> arrange for FC5 libraries to be used on the FC3 system [2].
>
> For [1], do this:
>
>   ln -sf $(g++ --print-file-name=libstdc++.a) .
>   g++ -static-libgcc -o exe main.o ... -L.
>   rm libstdc++.a
>
>   # exe now has libgcc.a and libstdc++.a statically linked in.
>
> For [2], do this:
>
>   g++ -o exe main.o ... -Wl,-rpath='$ORIGIN'
>
> Now copy 'exe' and libgcc_s.so.1 and libstdc++.so.6 into the same
> directory on FC3.
>
> Note that either solution may work, but is not at all guaranteed
> to work.
>
> Also, a slight modification to source may break it again -- there
> are symbols in FC5 libc, which are not present in FC3 libc, and if
> you introduce any code that depends on these, you are screwed.
>
>