Freepascal Toolkit in VS Code on macOS does not work

[PhoenixHawk]

Hi there,

I wanted to try out freepascal on macOS using VS Code (or Windsurf).
I therefore installed fpc on my computer using brew (fpc is 3.2.2 for aarch64), and the compiler itself works when I manually call it on the commandline.

I installed the FreePascal Toolkit from the VS Code Marketplace, but when I create a pascal file, the language server does not work. I get this output in the VS Code output window from the FreePascal Language Server and "Server initialization failed" from the fpctoolkit.

Code: [Select]

► RootURI: file:///Users/sebastian/dev/sg/freepascal
► ProjectDir: /Users/sebastian/dev/sg/freepascal/
✓ Client: Visual Studio Code 1.98.2
✓ FPCPath:
✓ FPCSrcDir: /usr/local/share/fpcsrc
✓ TargetOS:
✓ TargetProcessor:
✓ LazarusSrcDir:
✓ LazarusSrcOptions:
✓ Working directory: /Users/sebastian/dev/sg/freepascal
✓ FPCOptions: -FU./out -dDEBUG  -Fu/Users/sebastian/dev/sg/freepascal -Fi/Users/sebastian/dev/sg/freepascal -Fu/Users/sebastian/dev/sg/freepascal/.vscode -Fi/Users/sebastian/dev/sg/freepascal/.vscode
✓ ProjectDir: /Users/sebastian/dev/sg/freepascal/
✓ Symbol Database: [unspecified]
✓ Settings:
  ► maximumCompletions: 50
  ► overloadPolicy: Suffix
  ► insertCompletionsAsSnippets: FALSE
  ► insertCompletionProcedureBrackets: FALSE
  ► includeWorkspaceFoldersAsUnitPaths: TRUE
  ► includeWorkspaceFoldersAsIncludePaths: FALSE
  ► checkSyntax: FALSE
  ► publishDiagnostics: FALSE
  ► workspaceSymbols: FALSE
  ► documentSymbols: TRUE
  ► minimalisticCompletions: FALSE
  ► showSyntaxErrors: TRUE
[Error - 1:42:22 PM] Server initialization failed.
  Message: TFPCUnitToSrcCache.GetConfigCache missing CompilerFilename
  Code: -32603
[Error - 1:42:22 PM] Free Pascal Language Server client: couldn't create connection to server.
  Message: TFPCUnitToSrcCache.GetConfigCache missing CompilerFilename
  Code: -32603

What did I miss? I have no idea where to start looking for problems, as I don't have experience with language servers / VS Code plugins.

[cdbc]

Hi
Look in VS-Code at another language and try to find where it defines the 'CompilerFilename'...
Then look at the FPC one and see what it says...
Your error mentions it specifically: "missing CompilerFilename".
Regards Benny

[Martin_fr]

I don't know the VS Code add in, or anything...

But:

Code: Text  [Select][+][-]

1. couldn't create connection to server.

From what I gathered (read a good while back somewhere), the Language server is basically a wrapper for the Lazarus codetools (at least one VS extensions, IIRC the one by Joost V.d.S., does use that).
If that is the case, then it needs to run as a separate app in the background. And may or may not need its own config too.

As I said, nothing of this is for sure. But maybe, with the help of some search engine, this leads you to some docs that will help.

[PhoenixHawk]

Thanks. I didn't find that setting first, but then I figure out that it is the fpctoolkit.env.PP configuration and once set, the language server did start up.