Related Topics
Dynamic Linking
Dynamic linking is a term often used to embrace those portions of the link-editing
process that generate dynamic executables and shared objects, together with the
runtime linking of these objects to generate a runnable process. Dynamic linking
enables multiple applications to use the code provided by a shared object by enabling
the application to bind to the shared object at runtime.
By separating an application from the services of standard libraries, dynamic linking
also increases the portability and extensibility of an application. This separation
between the interface of a service and its implementation enables the system to evolve
while maintaining application stability. Dynamic linking is a crucial factor in
providing an application binary interface (ABI), and is the preferred compilation method
for Solaris applications.
Application Binary Interfaces
Binary interfaces between system and application components are defined to enable
the asynchronous evolution of these facilities. The Solaris linkers operate upon these
interfaces to assemble applications for execution. Although all components handled by
the Solaris linkers have binary interfaces, the whole set of interfaces provided by the
system is referred to as the Solaris ABI.
The Solaris ABI is a technological descendent for work on ABIs that started with the
System V Application Binary Interface and the successor work performed by SPARC™
International for SPARC processors called the SPARC® Compliance Definition (SCD).
32–Bit and 64–Bit Environments
The link-editors operate on 32–bit objects, and on SPARCV9 systems are also capable
of operating on 64–bit objects. On SPARC systems, the 64–bit link-editor (ld(1)) is
capable of generating 32–bit objects and the 32–bit link-editor is capable of generating
64–bit objects. In the latter case, the size of the generated object, not including the
.bss, is restricted to 2 Gbytes.
No command-line option is required to distinguish a 32–bit or 64–bit link-edit. The
link-editor uses the ELF class of the first input relocatable object file it sees on the
command-line to govern the mode in which it will operate. Specialized link-edits, such
20 Linker and Libraries Guide • August 2003
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