[Lazarus] How to switch a project from 32 to 64 bit (on Windows 7 x64)?

[Patrick Chevalley]

This is easy to do that, you only need one Lazarus, the 64bit version and the cross-i386 fpc compiler, you can remove Lazarus 32.
The only point to be careful is the default target for a new project will be Win64 and you have to add a Win32 build mode to all your projects. But the default target is saved with the project so this is a one time setup.
And to not overlap 32 and 64 build files you must be sure the Output directory path contain $(TargetCPU).

The files to install are lazarus-2.0.2-fpc-3.0.4-win64 first, then lazarus-2.0.2-fpc-3.0.4-cross-i386-win32-win64, both available from https://sourceforge.net/projects/lazarus/files/Lazarus%20Windows%2064%20bits/Lazarus%202.0.2/

Patrick