Paul Wicks Paul Wicks - 1 year ago 71
C Question

Why do I have to define LD_LIBRARY_PATH with an export every time I run my application?

I have some code that uses some shared libraries (c code on gcc). When compiling I have to explicitly define the include and library directories using -I and -L, since they aren't in the standard places. When I try to run the code, I get the following error:

./sync_test: error while loading shared libraries: cannot open shared object file: No such file or directory

However, do the following, everything works just fine:

export LD_LIBRARY_PATH="/path/to/library/"

Now, the strange part is, this only works once. If I try and run sync_test again I get the same error unless I run the export command first. I tried adding the following to my .bashrc, but it made no difference:


Answer Source


export LD_LIBRARY_PATH="/path/to/library/"

in your .bashrc otherwise, it'll only be available to bash and not any programs you start.

Try -R/path/to/library/ flag when you're linking, it'll make the program look in that directory and you won't need to set any environment variables.

EDIT: Looks like -R is Solaris only, and you're on Linux.

An alternate way would be to add the path to /etc/ and run ldconfig. Note that this is a global change that will apply to all dynamically linked binaries.

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