B.2.7 -Dname[(arg[,arg])][=expansion]

Define a macro with optional arguments as if the macro is defined by a #define preprocessing directive. If no =expansion is specified, the compiler assumes 1.

Predefinitions (not valid in-Xc mode):

• sun

• unix

• sparc (SPARC)

• i386 (x86)

The following predefinitions are valid in all modes.

• __BUILTIN_VA_ARG_INCR

• __SUNPRO_C=0x590

• __SVR4 (SPARC)

• __SunOS (Solaris Operating System)

• __SunOS_n_n (Solaris Operating System)

• __amd64 ( x86 with -m64)

• __gnu__linux (linux)

• __i386 (x86)

• __linux (linux)

• __linux__ (linux)

• __sparc (SPARC)

• __sparcv9 (-xarch=v9, v9a, v9b)

• __sun (Solaris Operating System)

• __unix

• __SunOS_n_n (Solaris Operating System) (example: __SunOS_5_9)

The following is predefined in-Xa and-Xt modes only:

• __RESTRICT

The compiler also predefines the object-like macro __PRAGMA_REDEFINE_EXTNAME to indicate the pragma will be recognized.