Migrating from Delphi 4
This section highlights some of the issues you can expect if you're moving up from Delphi 4.
RTL Issues
The only issue you're likely to come across here deals with the setting of the floating-point unit (FPU) control word in DLLs. Prior to version 5, DLLs would set the FPU control word, thereby changing the setting established by the host application. Now, DLL startup code no longer sets the FPU control word. If you need to set the control word to ensure some specific behavior by the FPU, you can do it manually using the Set8087CW() function in the System unit.
VCL Issues
There are a number of VCL issues that you may come across, but most involve some simple edits as a means to get your project on track. Here's a list ...
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