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146 A conforming implementation shall produce at least one diagnostic message (identified in an implementation-defined manner) if a preprocessing translation unit or translation unit contains a violation of any syntax rule or constraint, even if the behavior is also explicitly specified as undefined or implementation-defined.

147 Diagnostic messages need not be produced in other circumstances.8)

148 EXAMPLE An implementation shall issue a diagnostic for the translation unit:

        char i;
        int i;

because in those cases where wording in this International Standard describes the behavior for a construct as being both a constraint error and resulting in undefined behavior, the constraint error shall be diagnosed.


Created at: 2008-01-30 02:39:39 The text from WG14/N1256 is copyright © ISO