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POGCC, weird integer promotion scheme
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2012-06-25T10:01:38.177
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I'm working with GCC v4.4.5 and I've notived a default integer promotion scheme I didn't expected. To activate enough warnings to prevent implicit bugs I activated the option -Wconversion and since then I've notice that when I perform the code below, the warning "conversion to ‘short int’ from ‘int’ may alter its value" is present. <pre><code>signed short sA, sB=1, sC=2; sA = sB + sC; </code></pre> This means that "sB + sC" is promoted to int and then assigned to sA which is signed short. To fix this warning I have to cast it like this. <pre><code>signed short sA, sB=1, sC=2; sA = ( signed short )( sB + sC ); </code></pre> This warning is also present with the code below. <pre><code>signed short sA=2; sA += 5; </code></pre> And can be fixed by removing the operator += by this... <pre><code>sA = ( signed short )( sA + 1 ); </code></pre> which is a bit annoying cause I can't use the operators +=, -=. I expected GCC to select the right integer promotion according to the operands. I mean, sA=sB+sC and sA+=5 should not be promoted to int as they all are signed short. I understand that promoting to int by default prevents overflow bugs but it's a bit annoying cause I have to cast most of my code or change my variables to int. Is there a GCC option I could use to present this integer promotion scheme ? Thanks for your help.
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<gcc><integer-promotion>
Title
GCC, weird integer promotion scheme
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1. COI don't have a solution, but you can always write `short` instead of `signed short` in full, which may make this slightly less annoying. I admit it's still annoying though.
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 USMr Lister

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