warning: comparison between signed and unsigned integer expressions

How do people normally handle the comparison between signed and 
unsigned integers?  I have cross platform code (Mac and Windows and 
32 bit and 64 bit compilations). 

How do people normally get rid of the compiler warning for this code:


off_t fileLength = ...;
size_t bytesRead = ...;

if(bytesRead != fileLength)  //this line gives
   //warning: comparison between signed and unsigned integer expressions
{
}

Currently I just ignore it, but it's annoying and sloppy.

Thanx again all.
SD

-- 
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SD

WARNING: Programming may be habit forming.