cppdraft_translate/cppdraft/cpp/pragma.md

[cpp.pragma]

15 Preprocessing directives [cpp]

15.10 Pragma directive [cpp.pragma]

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A preprocessing directive of the form

pragma pp-tokensopt new-line

causes the implementation to behave in an implementation-defined manner.

The behavior may cause translation to fail or cause the translator or the resulting program to behave in a non-conforming manner.

Any pragma that is not recognized by the implementation is ignored.