dap --build-flags via vscode launch.json, how?

[aathan]

I'm having a heck of a time trying to figure out how to pass --build-flags to delve via vscode's launch.json. I'm using vscode on mac os x connecting to a remote linux environment. I need to pass -mod=mod so that the replace => in go.mod of the project is honored (vs build/debug against the vendor'ed version of the replaced modules). If I specify dlvFlags in launch.json, I get the Warning: build flags ignored with dap; specify via launch/attach request instead

This cryptic message appears to be saying something like "you need to pass these options to dlv via the DAP protocol's launch/attach request instead of specifying them in dlvFlags"... ok. How?!

EDIT: Ok, so having read the delve source code it appears that the DAP decoder for the launch DAP command can receive an arguments json etnry, but now ... how the heck do I get vscode to pass this?!

See #3462

[firelizzard18]

Have you tried "go.buildFlags": ["-mod=mod"]? Is that not passed to delve?