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PO-Wall without -Wreturn-type
 

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    <p>According to the GCC manual, the <code>-Wreturn-type</code> options is enabled with <code>-Wall</code>. However, I can't find a proper way to disable it while keeping the rest of <code>-Wall</code> enabled.</p> <p>Consider this code:</p> <pre><code>func() {} </code></pre> <p>If compiled without warnings, no output is produced. Now, if I turn on <code>-Wall</code> the following lines will appear:</p> <pre class="lang-none prettyprint-override"><code>$ gcc fn.c -Wall fn.c:1: warning: return type defaults to ‘int’ fn.c: In function ‘func’: fn.c:1: warning: control reaches end of non-void function </code></pre> <p>Ok, all nice. Now, if compiled with <code>-Wreturn-type</code>, the same output is produced:</p> <pre class="lang-none prettyprint-override"><code>$ gcc fn.c -Wreturn-type fn.c:1: warning: return type defaults to ‘int’ fn.c: In function ‘func’: fn.c:1: warning: control reaches end of non-void function </code></pre> <p>So, I conclude that <code>-Wreturn-type</code> is responsible for those warnings. But maybe it's not, or I'm doing something worse, as this was expected to produce no output:</p> <pre class="lang-none prettyprint-override"><code>$ gcc fn.c -Wall -Wno-return-type fn.c:1: warning: return type defaults to ‘int’ </code></pre> <p>Is it possible to use <code>-Wall</code> but disable <code>-Wreturn-type</code> completely? Or maybe I'm missing another available option?</p> <p>If it matters, I'm on Mac OS 10.7 (Darwin 11) with GCC 4.2.1 (strangely enough, compiled with LLVM :P)</p>
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    1. COJust to be "that guy," why not listen to the warnings and either declare your function(s) as void, or add return values to them?
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    2. CONo problem, indeed I missed that in the question. It happens that I'm working with old code, slowly being transformed, and would prefer a clean output form the compiler. It's not a big deal though, I'll certainly fix those soon. The real motivation to this question was to discover that if an option enables some warnings, why its negated version won't disable them?
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    3. COLast time I dug into this issue deeply, I concluded that it's just not possible to disable a single warning in GCC while retaining -Wall. An annoying shortcoming.
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