The version of Node.js I used is 10.21.0. I modified BUILD.gn under deps/v8 folder: I set V8_TRACE_IGNITION=true and I rebuilt Node.js using ./configure after that. Then I run "node --trace-ignition xx.js". I expected to trace the ignition's behavior. But it said bad option. I was wondering where I did wrong.
I was wondering where I did wrong.
To get an answer to that, you'd have to describe exactly what you've done, e.g. by posting the patch showing your edits to the file.
That said, modifying BUILD.gn is not necessary to get --trace-ignition to work. Simply use gn args out/<your_output_dir> to edit your build settings as usual, and add v8_enable_trace_ignition = true.