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[[gnu::unused]] is marked as incorrect syntax. [message #1750723]

Tue, 27 December 2016 12:12

Stephen Lynx

Messages: 1
Registered: December 2016

Junior Member

I have eclipse playing ball with C++11, but I can't make it accept [[gnu::unused]], it just says its invalid syntax. Any idea on how to make it see it as valid?

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Re: [[gnu::unused]] is marked as incorrect syntax. [message #1750875 is a reply to message #1750723]

Fri, 30 December 2016 14:27

David Vavra

Messages: 1413
Registered: October 2012

Senior Member

It's a gnu extension. The only attributes you should use are the standard ones listed here: http://en.cppreference.com/w/cpp/language/attributes
Also read: http://stackoverflow.com/questions/31909631/c11-style-unused-attribute-in-gcc

The closest standard attribute is probably [[maybe_unused]] and is only defined in C++17.
Either ignore the warning or use a pragma or command line option to turn it off,

You might also get away with defining a macro ATTR(x) that gives CODAN an empty string and the compiler what it needs:

#ifdef __CDT_PARSER__
#define ATTR(x) 
#else
#define ATTR(x) [[x]]
#endif

Personally, I don't see the utility in defining something that isn't used. YMMV

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