Re: perl native musl, ldd

[Jean-Marc Pigeon <jmp@safe.ca>]

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On 04/02/2015 12:18 PM, Rich Felker wrote:
> On Thu, Apr 02, 2015 at 11:53:19AM -0400, Jean-Marc Pigeon wrote:
>> Hello,
>>
>>
>> I compiled perl (native, under gcc-musl) and I have
>> a non expected result with ldd.
>>
>> Example: (with a musl system tree chroot)
>> bash=4/3# cd /usr/lib/perl5/5.20.2/auto/IPC/SysV/
>> bash-4.3# ldd SysV.so
>> 	ldd (0x7f5d60dd2000)
>> 	libc.so => ldd (0x7f5d60dd2000)
>> Error relocating SysV.so: Perl_croak: symbol not found
>> Error relocating SysV.so: Perl_sv_setiv: symbol not found
>> Error relocating SysV.so: Perl_sv_2pv_flags: symbol not found
>> Error relocating SysV.so: Perl_av_store: symbol not found
>> etc.
>>
>> While with glibc (with a glibc system tree chroot)
>> bash-4.3# cd /usr/lib/perl5/5.20.2/auto/IPC/SysV
>> bash-4.3# ldd SysV.so
>> 	linux-vdso.so.1 (0x00007fff09556000)
>> 	libc.so.6 => /lib64/libc.so.6 (0x00007f25be856000)
>> 	/lib64/ld-linux-x86-64.so.2 (0x00007f25bee00000)
>>
>> I am puzzled about those "Error relocating"
>> native (within musl) perl make didn't return error,
>> so I am assuming everything went well.
>>
>> Advices...? hints? do we have a real problem
>> with musl ldd or I goofed somehow?
> 
> Hmm, it seems like glibc ldd does not (or at least does not always)
> report symbols that can't be resolved. What seems to be happening is
> that the above symbols are intended to be provided by the main program
> (the perl interpreter) loading SysV.so rather than resolved via
> library dependencies.
> 
> I hadn't really considered using ldd on .so files, only on main
> programs where this would not be an issue.
> 
> If someone can help determine exactly what glibc ldd's behavior is
> here (does it always ignore missing symbols? or only for .so files,
> and if so, how does it distinguish .so file from main program?) it
> should be easy to make musl's behavior match.
> 

I am using a packager using ldd to establish
dependencies list.



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Jean-Marc Pigeon                        E-Mail: jmp@safe.ca
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