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The SharedCLibrary is a module built into most versions of RISC OS, although on many older machines a newer 32-bit version will be softloaded to allow running of modern applications.  It provides standard C functions as per the ANSI standard.  The 32-bit version also provides newer C99 and C18 functionality.  The SharedCLibrary additionally contains some RISC OS specific functions.  It is the default library that the [[Norcroft]] (Acorn C/C++) compiler targets.

Because of its relatively limited functionality compared to the full set of functions found on UNIX systems, it can make a poor choice to try and use for ported programs, and many original RISC OS programs where the programmer requires more functionality.  In these cases, the programmer may use [[UnixLib]], bundled with [[GCC]], which is its default target.  Programs compiled with GCC may also target the SharedCLibrary.  

In other cases, where the program only requires standard C functions, the SharedCLibrary can create a smaller binary, since programs with UnixLib are presently statically linked, adding around 130kB to the final program.  The SharedCLibrary must be used for RISC OS modules written in C.

==Links==

* [[C in RISC OS|Compiler/Library combinations]]
* [https://www.riscosopen.org/zipfiles/platform/common/PlingSystem.zip !System download] containing the 32-bit SharedCLibrary module