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POIs there a gcc 4.2 warning similar to Visual Studio's regarding possible loss of data?
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  1. POIs there a gcc 4.2 warning similar to Visual Studio's regarding possible loss of data?
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    copied!<p>Is there a flag for gcc such that conversions from a long to a short will generate a warning about a possible loss of data?</p> <p>I'm working on a C++ application that is compiled for both Visual Studio (2005) and GCC 4.2 (for Mac OS X).</p> <p>The warnings that Visual Studio prints out follow this pattern:</p> <pre><code>: warning C4244: 'argument' : conversion from 'long' to 'short', possible loss of data </code></pre> <p>I've tried -Wconversion, but that isn't quite what I'm looking for. The only thing I've been able to find so far is an experimental flag, -Wcoercion, which is associated with GCC 4.3 (which I'm not sure if we want to invest in quite yet).</p> <p><strong>April 22, 2009 @ 11:00 EST Edit:</strong>To clarify, I want to see that warning. We have code where we want to know when a data loss would occur. If I have the code:</p> <pre><code>unsigned long value1 = LONG_MAX; std::cout &lt;&lt; "value1: " &lt;&lt; value1 &lt;&lt; std::endl; unsigned short value2 = value1; std::cout &lt;&lt; "value2: " &lt;&lt; value2 &lt;&lt; std::endl; </code></pre> <p>I get this expected result:</p> <p><strong> &nbsp;&nbsp;value1: 2147483647<br> &nbsp;&nbsp;value2: 65535 </strong></p> <p>In our code, we have special asserts put in place that perform the coercion and warn us if the executed-code would result in a loss of data. We found the places in our large code base using Visual Studio's warnings.</p> <p>Is there any way we can generate these warnings in gcc 4.2?</p>
 

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