WhatIs: The LD LIBRARY PATH environment variable : Différence entre versions
(Page créée avec « When a program runs, it looks for the dynamically linked libraries (*.so files) it needs. The information on where to look for is stored in the LD_LIBRARY_PATH environmen... ») |
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<code>error while loading shared libraries: libnetcdff.so</code> | <code>error while loading shared libraries: libnetcdff.so</code> | ||
| − | In the example above < | + | In the example above <code>libnetcdf.so</code> was not found in any of the directories listed in LD_LIBRARY_PATH. Simply updating LD_LIBRARY_PATH with the correct path (for the sake of this example let's say libnetcdff.so is located in /my/personal/libraries/netcdf/lib): |
<code>export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/my/personal/libraries/netcdf/lib</code> | <code>export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/my/personal/libraries/netcdf/lib</code> | ||
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Note that an alternative to having to specify the paths in LD_LIBRARY_PATH is to specify the path at compile time (at the linking step) using the <code>-Wl,-rpath=</code> option | Note that an alternative to having to specify the paths in LD_LIBRARY_PATH is to specify the path at compile time (at the linking step) using the <code>-Wl,-rpath=</code> option | ||
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| + | 27/09/2021 | ||
[[Category:WhatIs]] | [[Category:WhatIs]] | ||
Version actuelle en date du 27 septembre 2021 à 11:17
When a program runs, it looks for the dynamically linked libraries (*.so files) it needs.
The information on where to look for is stored in the LD_LIBRARY_PATH environment variable, which contains the list of paths to scan, e.g.:
LD_LIBRARY_PATH=/some/path/to/lib:/some/other/path/to/lib
If the program fails to find a sought library, then it will not start and stop with an error message of the likes of:
error while loading shared libraries: libnetcdff.so
In the example above libnetcdf.so was not found in any of the directories listed in LD_LIBRARY_PATH. Simply updating LD_LIBRARY_PATH with the correct path (for the sake of this example let's say libnetcdff.so is located in /my/personal/libraries/netcdf/lib):
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/my/personal/libraries/netcdf/lib
will solve the problem. Note that you have to first update the LD_LIBRARY_PATH environment variable and the run your program.
To know which *.so libraries an executable (e.g. mycode.e) needs and where it finds them:
ldd mycode.e
Note that an alternative to having to specify the paths in LD_LIBRARY_PATH is to specify the path at compile time (at the linking step) using the -Wl,-rpath= option
27/09/2021
