[CMake] Installation corrupts library on OS X

[Clinton Stimpson]

On Tuesday, October 14, 2014 12:10:36 PM Peter Eastman wrote:
> Hi Clint,
> 
> In my case, it wasn't anything like that.  I was only specifying
> /usr/local/cuda/lib once.  More specifically, my CMakeLists.txt specified
> 
> TARGET_LINK_LIBRARIES(${SHARED_TARGET} ${CUDA_LIBRARIES})
> 
> where CUDA_LIBRARIES is
> 
> /usr/local/cuda/lib/libcudart.dylib-Wl,-rpath-Wl,/usr/local/cuda/lib

Since CMake 2.8.12, CMake will automatically figure out the 
-Wl,-rpath-Wl,/usr/local/cuda/lib part for 
/usr/local/cuda/lib/libcudart.dylib.

So, the duplicate comes from CMake adding it once, and you adding it once.

You should be able to remove any -Wl,-rpath flags that you add manually with 
CMake 2.8.12 and newer, and let CMake take care of that for you.

> 
> This library also linked against another of my libraries, that also happened
> to link against CUDA.  So that's why it was getting referenced twice: once
> directly, and once indirectly via a second library.
> 
> In any case, it's not clear to me why CMake is calling "install_name_tool
> -delete_rpath".  Everything works fine without doing that.  And when you do
> it, that breaks things.

CMake calls "install_name_tool -delete_rpath" at install time to remove the 
build rpaths and add install rpaths as specified by the INSTALL_RPATH target 
property.

For more details and examples:
http://www.kitware.com/blog/home/post/510
http://www.cmake.org/Wiki/CMake_RPATH_handling

Clint

> 
> Peter
> 
> On Oct 14, 2014, at 11:06 AM, Clinton Stimpson <clinton at elemtech.com> wrote:
> > Here's a simple way to reproduce from the command line:
> > 
> > echo "void foo() {}" > lib.c
> > gcc -dynamiclib -o libtest.dylib -Wl,-rpath,/usr/lib -Wl,-rpath,/usr/lib
> > lib.c install_name_tool -delete_rpath /usr/lib libtest.dylib
> > otool -L libtest.dylib
> > 
> >  # gives me the error: "load command 13 size zero (can't advance to other
> > 
> > load commands)"
> > 
> > At install time, CMake will call "install_name_tool -delete_rpath ... " as
> > needed.
> > 
> > I can't get into Apple's bug tracker.  I don't know why.  When I try to
> > log
> > in, it comes back with a generic error and it asks me to email them with
> > details about the error.
> > 
> > When I do the same on Linux, the GNU linker will consolidate the duplicate
> > paths.
> > 
> > Thanks!
> > 
> > Clint

-- 
Clinton Stimpson
Elemental Technologies, Inc
Computational Simulation Software, LLC
www.csimsoft.com