Example of a conditionally-supported-directive

Asked May 05 '17 at 14:21

Active May 05 '17 at 14:33

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Paragraph 1 of Preprocessing directives in the Standard defines the grammar production conditionally-supported-directive. And paragraph 2 says the following about this item:

A conditionally-supported-directive is conditionally-supported with implementation-defined semantics.

I'd like to have an example, if possible, of this conditionally-supported-directive.

edited May 05 '17 at 14:22

Federico klez Culloca

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asked May 05 '17 at 14:21

Belloc

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I think "conditionally supported" here just means that it is supported by the implementation with the conditions that are placed on it by the implementation. – Cody Gray - on strike May 05 '17 at 14:31
e.g. `#warning` – cpplearner May 05 '17 at 14:31
@cpplearner Yes, it appears gcc [supports #warning](http://stackoverflow.com/q/171435/1042389) – Belloc May 05 '17 at 14:41

Example of a conditionally-supported-directive

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