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.
A current list of predefinitions is given in the cc(1) man page.