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POHow do I quiet the C compiler about a function pointer takes any number of arguments?
 

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  1. POHow do I quiet the C compiler about a function pointer takes any number of arguments?
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    <p>I have a function pointer inside a <code>struct</code> that gets dynamically set at runtime to the address of another function in various places in my code. It is defined in my header file like this:</p> <pre><code> void *(*run)(); </code></pre> <p>During compile time, I get the following warning about this:</p> <pre><code> warning: function declaration isn't a prototype </code></pre> <p>This warning is benign, because the pointer is used in many places in my code to call the function it points to, and everything works just fine. However, I would <em>really</em> like to silence the warning.</p> <p>If I change it to this:</p> <pre><code> void *(*run)(void); </code></pre> <p>I get compile errors whever I use it, because the various functions that make use of the pointer have different numbers of arguments, and saying <code>void</code> inside the parenthesies tells the compiler it accepts no arguments.</p> <p>I can't use a <code>va_list</code> or anything fancy like that, as this is simply a pointer to another function, and I use a single pointer for them all because it keeps the code clean and simple.</p> <p>I can silence the warning with adding this to my compiler flags:</p> <pre><code> -Wno-strict-prototypes </code></pre> <p>But I'd rather not have to disable compiler warnings with flags if I can avoid it.</p> <p>So my question is: <strong>How do I notate this function pointer in the code in such a way that the compiler is satisfied with the fact that it accepts any number of any kind of arguments?</strong></p> <p>The code works perfectly. I just want the warning to go away.</p>
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    1. COJust to confirm, are you using `gcc` ? Also, are your functions defined with prototypes or are you using K&R style definitions?
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    2. COYes, using `gcc`. Not sure what "K&R" means.
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    3. COI mean old style function definitions without prototypes: `int (a, b) int a; int b; { /* ... */ }`
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