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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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ldd_ia(1)						      General Commands Manual							 ldd_ia(1)

NAME
ldd_ia: ldd - list dynamic dependencies of executable files or shared libraries on Integrity systems SYNOPSIS
filename... Remarks This manpage describes on Integrity systems. For on PA-RISC systems, see ldd_pa(1). DESCRIPTION
is a command that can list the dynamic dependencies of incomplete executable files or shared libraries. lists verbose information about dynamic dependencies and symbol references. If the object file is an executable file, lists all shared libraries that would be loaded as a result of executing the file. If it is a shared library, lists all shared libraries that would be loaded as a result of loading the library. uses the same algorithm as the dynamic loader and to locate the shared libraries at runtime. See in dld.so(5) for more information. Options recognizes the following options: Check reference to data symbols. Check reference to data and code symbols. Display the search path used to locate the shared libraries. Display all dependency relationships. EXTERNAL INFLUENCES
Environment Variables uses the following environment variables to locate shared libraries. These environment variables can be used to specify the directories to be searched for library files at runtime. The value is a colon-separated list of paths of such directories. For more information, see in dld.so(5) or the option in ld(1). The following internationalization variables affect the execution of Determines the locale category for native language, local customs and coded character set in the absence of and other environment variables. If is not specified or is set to the empty string, a default of (see lang(5)) is used instead of Determines the values for all locale categories and has precedence over and other environment variables. Determines the locale that should be used to affect the format and contents of diagnostic messages written to standard error. Determines the locale category for numeric formatting. Determines the locale category for character handling functions. Determines the location of message catalogs for the processing of If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to See envi- ron(5). DIAGNOSTICS
prints the record of shared library path names to stdout. The optional list of symbol resolution problems are printed to stderr. returns zero when the operation is successful. A non-zero return code indicates that an error occurred. EXAMPLES
By default prints a simple dynamic path information. This consists of the dependencies recorded in the executable (or the shared library) followed by the physical location where these libraries are found. The option causes to print dependency relationship along with the dynamic path information. The option to causes it to analyze all symbol references and print information about unsatisfied code and data symbols. WARNINGS
does not list shared libraries explicitly loaded using dlopen(3C) or shl_load(3X). FILES
output file 32-bit Integrity system dynamic loader 64-bit Integrity system dynamic loader 32-bit dummy executable loaded to check the dependencies of shared libraries 64-bit dummy executable loaded to check the dependencies of shared libraries message catalog SEE ALSO
System Tools ld(1) invoke the link editor Miscellaneous a.out(4) assembler, compiler, and linker output dld.so(5) dynamic loader Texts and Tutorials
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