The preprocessor directive pragma is part of the C++ standard but the form, content, and meaning of pragmas is different for every compiler. See Appendix B, Pragmas for details on the pragmas that the C++ compiler recognizes.
Oracle Solaris Studio C++ also supports the C99 keyword _Pragma. The following two invocations are equivalent:
#pragma dumpmacros(defs)
_Pragma("dumpmacros(defs)") To use _Pragma instead of #pragma, write the pragma text as a literal string enclosed in parentheses as the one argument of the _Pragma keyword.