[CMake] Link something to future installed library

[Martin Koller]

On Tuesday 12 March 2013 20:53:21 David Demelier wrote:

> Thanks for your answer, however target_link_libraries() my modules to the 
> target of core will link to the build binary directory as expected :
> 
> markand at Melon .../src/magicstat-2/_build_ $ ldd modules/battery/battery.so
> modules/battery/battery.so:
>         libcore.so => 
> /home/markand/work/src/magicstat-2/_build_/core/libcore.so (0x801204000)
>         libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x801405000)
>         libm.so.5 => /lib/libm.so.5 (0x801715000)
>         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x801936000)
>         libc.so.7 => /lib/libc.so.7 (0x80081a000)
> 
> once installed..
> 
> markand at Melon .../src/magicstat-2/_build_ $ ldd 
> /usr/local/lib/magicstat/modules/battery/battery.so
> /usr/local/lib/magicstat/modules/battery/battery.so:
>         libcore.so => not found (0)
>         libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x801204000)
>         libm.so.5 => /lib/libm.so.5 (0x801514000)
>         libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x801735000)
>         libc.so.7 => /lib/libc.so.7 (0x80081a000)



what you see is a different RPATH in the .so file.
check this with "objdump -x yourfile.so | grep RPATH"

To define a different RPATH on installed targets, use e.g.:

  set_target_properties(${target} PROPERTIES INSTALL_RPATH \$ORIGIN)

(Where \$ORIGIN is a special keyword which is always relative to the directory
the .so file is installed to. If you need different dirs, you can use other relative
dirs, e.g.: "../../core" in your case (or similar - you get the picture).
Check "man ld.so"


> 
> The installation hierarchy are the same as the build directory :
> 
> build/core/libcore.so
> build/modules/battery.so
> 
> and /usr/local/lib/magicstat/libcore.so
> /usr/local/lib/magicstat/modules/battery/battery.so

-- 
Best Regards/Schöne Grüße

Martin

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A: Because it breaks the logical sequence of discussion
Q: Why is top posting bad?