How to Specify Preferred Library Path for Linking in g and ld?

Specify Library Path Preference for Linking

When compiling a C program using g and ld, specifying the preferred library path for linking can become challenging. If a library of the same name exists in a standard directory like /usr/local/lib, ld may default to using that library instead of the one you specify directly.

To resolve this issue, several methods can be employed:

• Enhance LD_LIBRARY_PATH: By adding the path to the desired library to LD_LIBRARY_PATH, the linker will prioritize searching in that directory first. However, this approach may raise security and performance concerns.
• Utilize the -rpath Option: The -Wl,-rpath,$(DEFAULT_LIB_INSTALL_PATH) option in gcc allows specifying a runtime library search path. This overrides the default search directories and directs the linker to search in the specified path first.

For temporary solutions or to avoid permanently modifying LD_LIBRARY_PATH, the following options can be considered:

• Set LD_LIBRARY_PATH Environment Variable: This method involves setting the LD_LIBRARY_PATH environment variable to point to the desired library directory before invoking the executable.
• Check Known Libraries: The command /sbin/ldconfig -p | grep [library name] lists the known libraries to the linker.
• Identify Linked Libraries: The ldd [executable] command displays the libraries used by a specific application.

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