Recompiling the RTL, how to get around the checksum issue?

[jamie]

using an old version of laz there is  project file in the folder for the (FPC), RTL sources, and this project does
rebuild all of the files with a minor change I made to one of the units.

 All compiled find with an acception of needed to include a {$ASMMODE att} switch..

 
 I then moved (overwrote) the .o and ppu file that I made changes to,  into  the BIN folder of the RTL.

 When experimenting with a simple project, the compiler now complains about a checksum mismatch and attempts
to recompile, which fails.

 What do I need to make the compiler happy ? Do I need to move the whole contents of the newly compiled folder
over to the folder in use or what?

[Leledumbo]

Long story short: if unit B depends on A, whenever A changes, B needs to be recompiled. This applies to theoritically unlimited level of dependencies.

So, it depends on what unit this is and how other units you use depend on it.