In my first attempt, I (naively) compiled all the rexxGTK modules as 64-bit programs. Is it really possible to upgrade 32- to 64 bit code with just a re-compile? (Recognizing that I'd have to match that up with a 64-bit GTK or compile it and all it's dependencies to match.) It depends on how well the code was written. It takes a great deal of discipline to write code that works as both 32-bit and 64-bit. ooRexx is capable of that, but I can't making any assertions beyond that. Also it depends a lot on the compiler and tools. GCC and mingw have come a long way the the last 10 years -- I now have win-builds and win-build64 trees and my Rexx program that runs the compiler just points to one of them and sets a couple of options and it all works. All my code for PanGazer and MapGazer compiles for either cleanly (no warnings etc.). When I started compiling for 64-bit there were very few changes needed (a couple of times I saved pointers in a 32-bit field, which was naughty but fortunately easily fixed).
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