2.9 Predefined Names

The following identifier is predefined as an object-like macro:

Table 2–3 Predefined Identifier

Identifier	Description
__STDC__	__STDC__ 1 -Xc __STDC__ 0 -Xa, -Xt Not defined -Xs

The compiler issues a warning if __STDC__ is undefined (#undef __STDC__). __STDC__ is not defined in -Xs mode.

Predefinitions (not valid in -Xc mode):

• sun

• unix

• sparc (SPARC)

• i386 (x86)

The following predefinitions are valid in all modes:

• __sun

• __unix

• __SUNPRO_C=0x580

• __”uname -s”_”uname -r” (example: __SunOS_5_7)

• __sparc (SPARC)

• __i386 (x86)

• __BUILTIN_VA_ARG_INCR

• __SVR4

• __sparcv9 (-Xarch=v9, v9a)

The compiler also predefines the object-like macro __PRAGMA_REDEFINE_EXTNAME to indicate that the pragma will be recognized. The following is predefined in -Xa and -Xt modes only:

__RESTRICT