[aur-general] Gcc-6.3: ldd shows wrong symbols

[Eli Schwartz]

On 06/27/2017 08:56 PM, Stefan Husmann wrote:
> Hello,
> 
> I have put gcc63 to AUR, merely to have a working gcj implemetation,

Wait, isn't there already a gcc6 package in the AUR?

> something is wrong with it. If I compile anything with it, ldd shows
> that the resulting binaries have wrong symbols. For  instance,
> 
> ldd ~/paketierung/meine_Pakete/fotoxx/pkg/fotoxx/usr/bin/fotoxx |grep -v usr
>         linux-vdso.so.1 (0x00007ffcbe5cf000)
>         libstdc++.so.6 => /lib/gcc/x86_64-pc-linux-gnu/6.3.1/libstdc++.so.6 (0x00007fd4fb0e7000)
>         libgcc_s.so.1 => /lib/gcc/x86_64-pc-linux-gnu/6.3.1/libgcc_s.so.1 (0x00007fd4fabbe000)
>         /lib64/ld-linux-x86-64.so.2 (0x00007fd4fe8d6000)
> 
> IMHO it should be libstdc++.so.6 => /usr/lib/gcc/x86_64-pc-linux-gnu/6.3.1/libstdc++.so.6
> 
> What am I doing wrong? I do not know how to fix this.

How does the resulting binary have "wrong symbols" as a result of where
the linux dynamic linker resolves a soname without a path to? Also are
you aware that on Linux, "/lib" is a symbolic link to "usr/lib" and
therefore your preferred result resolves to the same filename? Also, gcc
7 was released to [core] a month ago.

A better question would be, why is the linker looking in
/usr/lib/gcc/$CHOST/$gccver/ instead of /usr/lib? And, do you have some
sort of actual issue whereby any of this would be relevant?

And, I think you are lying about the command you ran, not that it really
matters as the command wouldn't show anything interesting anyway.
Namely, I think you prefixed it with LD_LIBRARY_PATH="$blah"

> fotoxx is written in c++, but this happens also for programs compiled
> with gcc or gcj. The pdftk PKGBUILD especially suffers from this, as you
> can see in the AUR comments. 

The pdftk PKGBUILD and others suffer from being run with a custom
LD_LIBRARY_PATH and therefore having the dynamic loader match sonames to
non-default shared library filenames? Or something else?

-- 
Eli Schwartz

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