CCompilers
CCompilers[]
returns the list of C compilers supported for this version of the Wolfram Language that can be found on your system.
CCompilers[Full]
returns the list of all C compilers supported for this version of the Wolfram Language (but which may not actually be installed).
Examples
Text
Wolfram Research (2010), CCompilers, Wolfram Language function, https://reference.wolfram.com/language/CCompilerDriver/ref/CCompilers.html.
CMS
Wolfram Language. 2010. "CCompilers." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/CCompilerDriver/ref/CCompilers.html.
APA
Wolfram Language. (2010). CCompilers. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/CCompilerDriver/ref/CCompilers.html