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On UNIX System V descendent systems, during program runtime the dynamic linker resolves weak symbols definitions like strong ones. For example, a binary is dynamically linked against libraries libfoo.so and libbar.so. libfoo defines symbol f and declares it as weak. libbar also defines f and declares it as strong.
The GNU linker (or GNU ld) is the GNU Project's free software implementation of the Unix command ld. GNU ld runs the linker, which creates an executable file (or a library) from object files created during compilation of a software project. A linker script may be passed to GNU ld to exercise greater control over the linking process. [6]
In most Unix-like systems, most of the machine code that makes up the dynamic linker is actually an external executable that the operating system kernel loads and executes first in a process address space newly constructed as a result of calling exec or posix_spawn functions. At link time, the path of the dynamic linker that should be used is ...
An ELF file has two views: the program header shows the segments used at run time, whereas the section header lists the set of sections.. In computing, the Executable and Linkable Format [2] (ELF, formerly named Extensible Linking Format) is a common standard file format for executable files, object code, shared libraries, and core dumps.
Direct binding is a feature of the linker and dynamic linker on Solaris and OpenSolaris.It provides a method to allow libraries to directly bind symbols to other libraries, rather than weakly bind to them and leave the dynamic linker to figure out which library contains the symbol.
Dynamic loading is a mechanism by which a computer program can, at run time, load a library (or other binary) into memory, retrieve the addresses of functions and variables contained in the library, execute those functions or access those variables, and unload the library from memory.
While dynamic linking has advantages in code size and management, there are drawbacks as well. Every time a program is run, the loader needs to resolve (find) the relevant libraries. Since libraries move around in memory, there is a performance penalty for resolution.
The object file is input for the dynamic linker and can't be statically link edited again. 1<<3: 0000_0000_0000_0000_0000_0000_0000_1000: The object file's undefined references are bound by the dynamic linker when loaded. 1<<4: 0000_0000_0000_0000_0000_0000_0001_0000: The file has its dynamic undefined references prebound. 1<<5