Re: [Xen-devel] [PATCH] tools/xenstore: add libdl dependency to libxenstore

[Olaf Hering <olaf@xxxxxxxxx>]

On Fri, Mar 09, Olaf Hering wrote:

> abuild@latitude:~> readelf -Wa /usr/lib64/libpython2.7.so | grep dlsym
> 00000000003e5e08  000000d900000007 R_X86_64_JUMP_SLOT     0000000000000000 
> dlsym@GLIBC_2.2.5 + 0
>    217: 0000000000000000     0 FUNC    GLOBAL DEFAULT  UND dlsym@GLIBC_2.2.5 
> (10)
> abuild@latitude:~> readelf -Wa /usr/lib64/libxenstore.so | grep dlsym
> 00000000002071b0  0000002b00000007 R_X86_64_JUMP_SLOT     0000000000000000 
> dlsym + 0
>     43: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND dlsym

The difference is SUSE_ASNEEDED=1 in environment.
If it is set, libxenstore.so will not link to libdl.so.
If it is not, libxenstore.so will link to libdl.so.
Since package building exports SUSE_ASNEEDED=1 usage of -lxenstore will
fail. Not sure how all the other packages use dlsym(), clearly xenstore
does something different.

Olaf

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