[CMake] How to get a list of all the static libraries that a target will link against ?

[Glenn Coombs]

Don't all shout at once :-)  I'm guessing there are no easy solutions
then...

--
Glenn


On 28 June 2014 14:33, Glenn Coombs <glenn.coombs at gmail.com> wrote:

> I have a project which compiles and links into both a stand alone
> executable and a dynamic shared library.  The library and the executable
> link against the same project libraries but have different object files
> containing their entry points: main.o for the executable and dll_main.o for
> the library.  My project heirarchy looks like this (simplified a bit for
> brevity):
>
> CMakeLists.txt
>     mtx_source/CMakeLists.txt
>     mtx_wrapper/CMakeLists.txt
>     testbench/CMakeLists.txt
>
> The top level CMakeLists.txt calls add_subdirectory on the various project
> specific library folders which each build a static library.  The testbench
> folder is the one that builds both the executable and the dynamic library.
> When building the dynamic library I need to use the linker options
> -whole-archive and -no-whole-archive to force my static project libraries
> to be included into the dynamic library. The problem is how to insert the
> -whole-archive and -no-whole-archive options so that they select the
> correct set of libraries.  Currently in the testbench CMakeLists.txt file I
> have these lines:
>
> set(libs
>     VLC
>     mvea
>     ${SYSTEMC_SUPPORT_LIBRARIES}
>     ${DEVIFSLAVE_LIBRARIES}
>     ${SYSTEMC_LIBRARIES}
>     ${SIM_UTILS_LIBRARIES}
>     ${HWDEBUG_LIBRARIES}
> )
>
> if (NOT STUB_OUT_MTX)
>     list(APPEND libs mtx_wrapper)
> endif()
>
> set(libs_dll ${libs} transif_slave)
>
> if (UNIX)
>     list(INSERT libs_dll 0 -Wl,-whole-archive)
>     list(APPEND libs_dll   -Wl,-no-whole-archive)
> endif()
>
> add_library ( csim_dll SHARED ${sources_dll} ${headers_dll} )
> add_executable( testbench       ${sources}     ${headers}     )
>
> target_link_libraries(csim_dll  ${libs_dll} ${PTHREADS_LIBRARIES} )
> target_link_libraries(testbench ${libs}     ${PTHREADS_LIBRARIES} )
>
> which produces the following link line:
>
> /usr/bin/g++-4.7  -fPIC -m32  -m32 -m32 -fPIC -m32 -O3  -O3 -DHIDEBUG
> -Wl,-Bsymbolic
> -shared -Wl,-soname,libtopazhp.so
> -o libtopazhp.so
> CMakeFiles/csim_dll.dir/dll_main.cpp.o
> CMakeFiles/csim_dll.dir/main_common.cpp.o
> -lm -lrt -lm -lrt
> -Wl,-whole-archive
> ../mvea/VLC/libVLC.a
> ../mvea/libmvea.a
> ../systemCSupport/libsystemc_support.a
> ../devif_slave/libDevifSlave.a
> ../systemC/libsystemc.a
> ../sim_utils/libsim_utils.a
> ../hwdebug/libhwDebug.a
> ../mtx_wrapper/libmtx_wrapper.a
> ../transif/libtransif_slave.a
> -Wl,-no-whole-archive
> -lpthread -lz
> ../systemC/libpthreads_dummy.a
> ../external_mtx/src/external_mtx-build/metag/libmetag.a
> ../external_mtx/src/external_mtx-build/metagcopro/libmetagcopro.a
> ../external_mtx/src/external_mtx-build/metac/vmetastub/libvmetastub.a
> ../external_mtx/src/external_mtx-build/metac/insim/libinsimfpu.a
> ../external_mtx/src/external_mtx-build/mtx/insim-mtxg/libinsim-mtxg.a
> ../external_mtx/src/external_mtx-build/mtx/libmtxc.a
> -ldl -lm -lrt -lm -lrt
>
> The problem is that the 6 external_mtx libraries should have been included
> inside the -whole-archive section.  These libraries are specified in the
> mtx_wrapper folder with a target_link_libraries(mtx_wrapper
> ${METASIM_LIBRARIES}) command.  I have managed to wrap the direct library
> dependencies inside the -whole-archive but I need to ensure that any
> sub-dependencies are included as well (and any dependencies they might have
> recursively).  Any system dynamic libaries (-ldl -lm -lrt etc.) must appear
> after the -no-whole-archive option otherwise the link fails.  The
> mtx_wrapper library can be built in two ways and only one of them will add
> the extra METASIM libraries as a dependency, the other way fakes that code
> internally.  Adding the METASIM libraries via target_link_libraries()
> inside the mtx_wrapper CMakeLists.txt correctly handles that dependency
> when linking the standalone executable but is not working for linking the
> dynamic library.
>
> Is there an easy way to get cmake to handle all this ?  Is there a way to
> get a list of all the static libraries (libXXX.a) that will be included on
> the link line for a target ?
>
> --
> Glenn
>
>
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