Problem during dlopen()

[Konstantin Belousov]

On Tue, Jul 05, 2016 at 01:13:42PM +0200, Willem Jan Withagen wrote:
> Hi,
> 
> I'm banging my head agains the wall because I cannot seem to get this
> working.
> 
> The problem is due to changing from automake to cmake building.
> 
> But all my dlopens start failing with something like:
> load failed dlopen(build/lib/compressor/libceph_snappy.so) or
> dlopen(build/lib/libceph_snappy.so): build/lib/libceph_snappy.so:
> Undefined symbol "_ZN4ceph6buffer4list8iterator7advanceEl"
> 
> If do a lookup for  the name:
> nm build/lib/libceph_snappy.so |grep ceph6buffer4list8iterator7advanceEl
> 
> if give me:
>                  U _ZN4ceph6buffer4list8iterator7advanceEl
> 
> The parent/calling executable however has:
> 	0000000000513de0 T _ZN4ceph6buffer4list8iterator7advanceEl
Are you sure ?  In which symbol table (dynamic or debug) the referenced
symbol appear ?  Check with nm -D.  If it is in debug table, you need
--export-dynamic linker switch when creating the binary defining the
symbols.

> 
> Clearly dlopen is not able to match these 2 and succeed.
Why are you sure that the dynamic linker at fault ?

> 
> Question:
> So on which part of the building is what switch missing.
> 
> Thanx,
> --WjW
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