In my project I include stddef.h but find error on __CX2__
it's a bug or not
I try to modify it to #if defined (__CX2__) and passed.
what mains about __CX2__ ?
preprocessor issue - so the compiler, strictly speaking, has no business making any comment about it.
Not quite, since the preprocessor is built into the compiler these days. Strictly speaking the compiler, while outputting a diagnostic about this, is the preprocessor.
CX2 is a new mode for SmartCards that is currently in development. The new STDLIB file accicently went into the release without carefully checking of the impact.
Correct is:
#ifdef __CX2__