#pragma directive — Controls the compiler
#pragma tokens
The #pragma
directive is
implementation-defined. An implementation can define certain pragma
parameters to control the compiler. The preprocessor ignores any
pragma that it does not recognize.
Because pragmas are highly compiler-dependent, you should avoid using them as much as possible. Most compilers let you control the compiler by providing command-line options, configuration files, or project files. Do your best to keep compiler-specific information out of your source files. When you must use pragmas, protect them with conditional directives for specific compilers.