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Top Forums Programming How to make use others' C library installed not for the system-wide (Ubuntu/Linux)? Post 303043071 by GRMartin on Friday 17th of January 2020 09:50:13 AM
Old 01-17-2020
rpath is actually a linker option rather then a compiler option. gcc passes it to ld.



Well, th estandard way to use shared objects (.so) is to install them in the system directories used for that purpose (/usr/lib etc.) but that's not always possible. The archive (.a) allows you to link objects into your executable which produces a larger exectable but gets around the problem. If the library is updated you must recompile whereas with a shared object you only need to recompile if the update breaks your code.


For the loader to load a shared object at runtime it must know where to find them. rpath tells the linker to embed the path in the header of the executable but if the so is moved the loader won't be able to load it. ORIGIN resolves to whereeve the binary is at runtime so as long as the library stays with the executable it works.


-Greg.
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FASTJET-CONFIG(1)						   User Commands						 FASTJET-CONFIG(1)

NAME
fastjet-config - fastjet-config DESCRIPTION
This is FastJet configuration tool. Usage: fastjet-config [--help] [--version] [--prefix] [--cxxflags] [--libs] [--shared[=yes|no]] [--plugins[=yes|no]] [--rpath[=yes|no]] [--runpath] [--list-plugins] [--config] The arguments can be either queries (one must be present): --help prints this message and exits --version prints FastJet version and exits --prefix gets the FastJet installation directory --cxxflags returns the compilation flags to be used with C++ programs --libs returns the flags to pass to the linker or flags (optional): --shared controls whether you want to use the static or shared lib (default=yes) --plugins controls whether you also want to link the FastJet plugins (default=no) --rpath adds a -rpath argument at link-time that points to the directory where FastJet libraries are installed. This avoid having to set LD_LIBRARY_PATH at runtime when using shared libs in a non standard location (but may cause the program to inadvertently pick up other shared libraries that happen to be in the FastJet installation directory). (default=yes) --runpath at link-time, adds info about the directory where FastJet libraries are installed to the runpath (ELF systens only). This avoids having to set LD_LIBRARY_PATH at runtime when using shared libs in a non standard location but gives priority to an existing LD_LIBRARY_PATH. --list-plugins list all the available plugins --config shows a summary of how FastJet was configured AUTHOR
This manual page was written by Lifeng Sun <lifongsun@gmail.com> for the Debian system (but may be used by others). fastjet-config May 2012 FASTJET-CONFIG(1)
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