On Tue, Mar 8, 2016 at 7:40 AM, Harshad Sahasrabudhe <hsaha...@purdue.edu>
wrote:
> -rpath has nothing to do with undefined references at link time. It's for
>> "baking in" the library path to an executable so it can be found at runtime
>> regardless of your LD_LIBRARY_PATH variable.
>
> The problem here seems to be that you are have built a version of VTK in
>> which "libvtkDICOMParser" is required by libvtkIO, something I've never
>> encountered before.
>
>
> But then how come the 0.9.4 VTK link test works and 0.9.5 doesn't? The
> only difference in the link command is that -rpath
>
This appears to be a difference (that I wasn't aware of) between the linker
on OSX and the GNU linker on Linux:
>From "man ld" on OSX:
-rpath path
Add path to the runpath search path list for image being created.
At runtime, dyld uses the runpath when searching for dylibs whose
load path begins with @rpath/.
>From "man ld" on Linux (GNU linker):
GNU ld (GNU Binutils for Ubuntu) 2.22
-rpath=dir
Add a directory to the runtime library search path. This is used
when linking an ELF executable with shared objects. All -rpath
arguments are concatenated and passed to the runtime linker, which
uses them to locate shared objects at runtime. *The -rpath option is*
* also used when locating shared objects which are needed by shared*
* objects explicitly included in the link; see the description of the*
* -rpath-link option.* If -rpath is not used when linking an ELF
executable, the contents of the environment variable "LD_RUN_PATH"
will be used if it is defined.
-rpath-link=dir
When using ELF or SunOS, one shared library may require another.
This happens when an "ld -shared" link includes a shared library as
one of the input files.
So it appears that we are in the "one shared library may require another"
situation for your VTK build on Linux. Interestingly, we have not seen
this when we build VTK on Linux. We use the following cmake commands when
building VTK on Linux:
cmake ../../VTK-6.3.0 \
-DCMAKE_INSTALL_PREFIX=$PACKAGES_DIR/vtk-6.3/gcc-opt \
-DCMAKE_BUILD_TYPE=Release \
-DVTK_Group_Rendering=OFF \
-DVTK_WRAP_PYTHON=ON \
-Wno-dev
Can you post your VTK cmake commands to the list?
I guess I will also put the -rpath commands back in the configure test, now
that I know they are not just for finding stuff at runtime (at least for
certain linkers).
--
John
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