I have an executable that implicitly loads several .so libraries, all of them built by me. For deployment, or at least testing/debugging, I'd like to have them all in the same directory:
my_executable
libmylib1.so
libmylib2.so
To get the executable to load the libraries implicitly, I'd like to set an rpath (DT_RUNPATH) for the executable's directory. With OS X, I'd do this like so:
clang -dynamiclib -o libmylib1.dylib -install_name @rpath/libmylib1.dylib src1.c src2.c
clang -dynamiclib -o libmylib2.dylib -install_name @rpath/libmylib2.dylib src3.c src4.c
clang -o my_executable -L. -llibmylib1.so -llibmylib2.so -Wl,-rpath,@loader_path/. main.c
Notice the @loader_path/.
that forms the executable's rpath in OS X. With Linux, the closest I can come to this is
gcc -dynamiclib -o libmylib1.so src1.c src2.c
gcc -dynamiclib -o libmylib2.so src3.c src4.c
gcc -o my_executable -L. -llibmylib1.so -llibmylib2.so -Wl,-rpath=. main.c
The problem here is that on Linux the rpath follows the current working directory, not the executable's directory. Is there any way of accomplishing the same thing on Linux?
To create an RPATH entry, you simply tell it to the linker (not the compiler!), so for instance you could add to your ./configure call the string LDFLAGS=-Wl,-rpath,/my/software/base/my/lib/. libs to build and run against a specific version of your library. But what about an already-linked binary?
What is RPATH and $ORIGIN. RPATH stands for run-time search path. According to Wikipedia, “rpath designates the run-time search path hard-coded in an executable file or library.
The Runtime Path. The runtime path is similar to the environment variable PATH in Unix-based systems. Vim will search in these paths to locate and source many different files during startup. To see all of these paths, you can look at the value of the option runtimepath , by running the command :set runtimepath? .
You need to use the literal string $ORIGIN
as the runpath, that is understood as the executable's location by the dynamic loader.
A common solution is to create a shell script wrapper that figures out what directory the executable is in and sets LD_LIBRARY_PATH appropriately before execing the actual executable.
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