Emitting warnings on GCC

Is there a way that I could pass a string message 开发者_Python百科as a warnign in GCC (but not as an ordinary message)?

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(googled:)

#error works and needs to, because the standard mandates it. gcc also has #warning.

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You could use warning about usunused variable for this - http://www.ideone.com/GyAMq

if(1 < 0) {
            char warning__1_Should_not_be_less_than_0;
    }