What to do to make application Large Address Aware?

Question

I am currently in process of making our application Large Address Aware. As experience has shown, there are some unexpected gotchas when doing so. I create this post to make

Answer 1

• (obvious) select Support Address Larger than 2 Gigabytes (/LARGEADDRESSAWARE) in the project properties: Linker / System / Enable Large Address
• check all pointer subtractions and verify the result is stored in a type which can contain the possible difference, or replace them with comparisons or other constructs - see Detect pointer arithmetics because of LARGEADDRESSAWARE). Note: pointer comparison should be fine, contrary to AMD advice, there is no reason why it should cause 4 GB issues
• make sure you are not assuming pointers have Bit31 zero, do not attempt to use Bit31 for something else.
• replace all GetCursorPos calls with GetCursorInfo - see GetCursorPos fails with large addresses
• for all assignments into PVOID64 use PtrToPtr64, needed e.g. when using ReadFileScatter, see ReadFileScatter remark section