[Openmp-dev] Distributing program with OpenMP

[Jonas Hahnfeld via Openmp-dev]

Hi Bob,

static linking of the OpenMP runtime is in general discouraged because 
it produces all sort of nasty problems if there is still any shared 
library that also uses OpenMP. I think this is also why no static 
library is built by default but you can build only the OpenMP runtime 
yourself and enable an option for that (-DLIBOMP_ENABLE_SHARED=OFF). 
Then you might try passing -static to clang or some similar options.
Another possibility would be to bundle the shared library and set an 
rpath for the current (relative) directory. I think this might be 
possible but I can't verify at the moment.

Let us know if any of this worked,
Jonas

Am 2017-12-18 18:19, schrieb Rob McDonald via Openmp-dev:
> I'd like to distribute my program that uses OpenMP built with CLang
> 5.0.  I use CLang/LLVM as provided by MacPorts.
> 
> I need to distribute my program to users who won't have MacPorts or a
> compiler installed.
> 
> Unsurprisingly, output of otool shows that my program needs 
> libomp.dylib:
> 
> otool -L myprogram
> myprogram:
> /opt/local/lib/libomp/libomp.dylib (compatibility version 5.0.0,
> current version 5.0.0)
> /usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 
> 120.1.0)
> /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
> version 1226.10.1)
> 
> Previously, I had compiled my program using gcc and was able to link
> OpenMP statically
> 
> otool -L myprogram
> myprogram:
> /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
> version 159.1.0)
> 
> By doing something like this:
> 
> if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
>   set(CMAKE_EXE_LINKER_FLAGS "-static-libgcc -static-libstdc++")
> endif()
> 
> Is there a way to do this with CLang?
> 
> If not, what is the preferred way to bundle the required OpenMP 
> library?
> 
> I build from a CMake environment, so on Windows, I already do this:
> INCLUDE( InstallRequiredSystemLibraries )
> to grab all the required OpenMP libraries and whatnot.
> 
> My program is distributed as a dumb *.zip file -- nothing that gets
> installed to the system.  Will this still work in this paradigm, or
> will I need to get permission and install this library?
> 
> Rob
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