[CMake] target_link_libraries can't link shared libraries not listed in LD_LIBRARY_PATH

[Vyacheslav Karamov]

Hi!

I just find the solution. The problem was in order how libraries were 
specified.
target_link_libraries(${lib_name}
general rt
general dl
general pthread
debug ${do_scoring_debug}
optimized ${do_scoring}
general ${spinx}
general ${cblas}
general ${atlas}
)


23.04.2012 16:28, Andreas Pakulat ???????:
> Hi,
>
> On Mon, Apr 23, 2012 at 13:24, Vyacheslav Karamov 
> <ubuntulist at yandex.ru <mailto:ubuntulist at yandex.ru>> wrote:
>
>     Hi All!
>
>     I have a problem with target_link_libraries. It  can't link with
>     shared libraries not from directory listed in LD_LIBRARY_PATH.
>     1. When I try to link shared library with the full path obtained
>     from find_library, my library is passed to gcc without -l option
>     as ordinary object file.
>
>
> What is the problem with linking the absolute path of the shared 
> library? This should just work
>
>     2. When I try to link by specifying short name "cblas" I've got
>     the error message:
>
>     Linking CXX shared library
>     ../../sndcompare/amd64sse3/libsndcompared.so
>     /usr/bin/ld: cannot find -lcblas
>     collect2: ld returned 1 exit status
>     make[2]: *** [../../sndcompare/amd64sse3/libsndcompared.so] Error 1
>     make[1]: *** [CMakeFiles/sndcompare.dir/all] Error 2
>     make: *** [all] Error 2
>     *** Failed ***
>
>
> This is because the linker does not know the directory where to search 
> for the library.
>
>     add_library(${lib_name} SHARED
>     ${io_files}
>     ${utils_files}
>     ${tech_independ_files}
>     ${other_files}
>     )
>
>     find_library(atlas
>        NAME atlas
>        PATHS
>     ${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_SYSTEM_NAME}/atlas/${arch}/lib
>        DOC "Atlas library"
>        )
>
>     find_library(cblas
>        NAME cblas
>        PATHS
>     ${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_SYSTEM_NAME}/atlas/${arch}/lib
>        DOC "Cblas library"
>        )
>
>     link_directories(
>     ${CMAKE_CURRENT_SOURCE_DIR}/${CMAKE_SYSTEM_NAME}/atlas/${arch}/lib
>     ${CMAKE_CURRENT_SOURCE_DIR}/../../Sphinx/sphinxbase/${CMAKE_SYSTEM_NAME}/${arch}/lib
>     )
>
>
> link_directories is not needed at all here or should not be needed. 
> Just make sure to pass ${cblas} and ${atlas} to
> target_link_libraries. If that produces errors please provide the 
> exact error message.
>
> Andreas

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