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Despite breakpoints hitting correctly, debug windows are not showing runtime values. They remain blank or unresponsive - making it frustrating to inspect variables during debugging. However in sometimes after build it works but sometimes doesn't work. Also i build it in Debug Build (Not Release Build). I have multiple projects in project group and i ensured the right project selected.

Values not showing in Delphi Debugger:

  • Watch List window
  • Local Variables window
  • Tooltip hover (when hovering over variables)

Building a Delphi (Delphi 10.4.2) project takes significantly longer than with many modern languages. Moreover, after a lengthy Build, often the Debugger still does not show runtime values, which is more frustrating.

Is there a reliable way to verify that the build not only succeeded, but also includes up to date debug information?

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  • Which version of Delphi are you using? On which version of Windows? Commented Aug 29 at 3:55
  • @RemyLebeau Delphi 10.4.2 on Windows 10 Commented Aug 29 at 5:31
  • 1
    Check you AntiVirus software and Firewall settings. When debugging 64 bit or mobile applications Delphi is using PAServer . Since Delphi is communicating with PAServer through network connection it is possible that your AntiVirus or Firewall is causing interference. Commented Aug 29 at 7:53
  • This is probably not it, but the behavior you describe is what happens in Release build. Did you double check youre in debug build and do a full build? Commented Aug 30 at 14:03

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Things to watch out for:

  • First one to check: if you have multiple projects in your group, make sure you have the right project selected. If you have a file open from another project, and you see a breakpoint, it doesn't mean that you're debugging it.

  • Check if you have release build or debug build.

  • And if you have breakpoints in VCL or RTL code, you set the compiler option to use debug dcu's.

  • When you make Delphi remember your breakpoints, they'll end up being stored based on line number in a file. After you pull changes from git (or some other VCS), the line numbers might no longer make sense.

  • Things get even messy if you have multiple .pas files or multiple DCU's or have the same code compiled into a .DCP package. You might compile and debug something else than you think you are. And Delphi doesn't complain. It just picks the first it finds.

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