Re: [Xen-devel] [PATCH 3 of 5] blktap2: fix vhd compilation under uclibc

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2011-12-20 at 17:55 +0000, Roger Pau Monnà wrote:
> Hello,
> 
> I've added -liconv to blktap2/vhd/lib, and succesfully compiled and
> linked the library. The output from ldd libvhd.so shows:
> 
> checking sub-depends for '/lib/libuuid.so.1'
> checking sub-depends for '/usr/lib/libiconv.so.2'
> checking sub-depends for '/lib/libc.so.0.9.32'
> checking sub-depends for '/lib/ld64-uClibc.so.0.9.32'
>       libuuid.so.1 => /lib/libuuid.so.1 (0x00000000)
>       libiconv.so.2 => /usr/lib/libiconv.so.2 (0x00000000)
>       libc.so.0.9.32 => /lib/libc.so.0.9.32 (0x00000000)
>       ld64-uClibc.so.0.9.32 => /lib/ld64-uClibc.so.0.9.32 (0x00000000)
>       not a dynamic executable
> 
> Then I've compiled and linked vhd tools (vhd-util and vhd-update)
> without -liconv, since vhd tools doesn't use any iconv functions. They
> compile fine, but when I try to execute them I get the following
> error:
> 
> vhd-util: symbol 'libiconv_open': can't resolve symbol
> 
> If I do a ldd of vhd-util:
> 
>       libvhd.so.1.0 => /usr/lib/libvhd.so.1.0 (0x7699efaf4000)
>       libc.so.0.9.32 => /lib/libc.so.0.9.32 (0x7699ef88c000)
>       libuuid.so.1 => /lib/libuuid.so.1 (0x7699ef689000)
>       ld64-uClibc.so.0.9.32 => /lib/ld64-uClibc.so.0.9.32 (0x7699efd10000)
> 
> How come libiconv is not linked to the application if libvhd is?

Can you post the complete link line for each stage?

Are you sure that /usr/lib/libvhd.so.1.0 is the same one you just built
and linked against? Is there a chance you have linked against something
in the build directory which did not get properly installed?

Running
        objdump -p <object> | egrep NEEDED\|SONAME
for the library (both build dir and installed copies) and binary would
be interesting.

It seems like either this is a bug in uClibc's dynamic linker or my
expectation of how these sorts of transitive library dependencies work
has been set too high by glibc...

>  And
> what's most strange, why is the link to libuuid keep, but not the one
> to libiconv?

Yes, that is strange.

Ian.


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