emscripten-core/emscripten

Canary doesn't load dwarf symbols with "-g4 --source-map-base"

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#13,687 opened on Mar 17, 2021

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good first bughelp wanted

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Description

I don't know if it's a browser (Canary) or an emscripten issue:

On any trivial example:

  • When compiling and linking with "-g4 --source-map-base http://0.0.0.0:8000/", Canary correctly loads the .wasm.map file, and finds the source files, but debugging symbols are not resolved (local variables, arguments, etc.)

Other cases work fine:

  • When compiling and linking with "-g", you get the dwarf symbols, but files are accessed through the local filesystem.
  • When compiling and linking with "-gseparate-dwarf", you get the separate dwarf symbols, but files are accessed through the local filesystem.

Tested version: Emscripten 2.0.15 (Mar 09, 2021) (macOS)

Contributor guide

Research direction
Investigate why dwarf symbols are not loaded when using g4 source map base flag. Check the handling of source maps and dwarf in Emscripten's linker.
Tech stack
cpp
Domain
compilers
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitC++
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60