Regroup pointer comparisons to avoid subtraction. #583
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The compiler always insists on treating the difference between two pointers as potentially negative, yielding warnings when comparing it to an integer that has (or will soon have) a pointer-width unsigned type. Equivalent pointer-to-pointer comparisons yield no such warnings and are still clear. Signed-off-by: Aaron M. Ucko <ucko@ncbi.nlm.nih.gov>
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The compiler always insists on treating the difference between two pointers as potentially negative, yielding warnings when comparing it to an integer that has (or will soon have) a pointer-width unsigned type. Equivalent pointer-to-pointer comparisons yield no such warnings and are still clear.
Split from #555.