Cryptic `sig is undefined` error in reportUndefinedSymbols() if function signature not available · emscripten-core/emscripten#17283

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good first bughelp wanted

説明

Discussed in https://github.com/emscripten-core/emscripten/discussions/17266

Originally posted by johnwason June 18, 2022 Currently if a function signature is not defined, reportUndefinedSymbols() will simple raise an error sig is undefined, which is not at all helpful. An error handler should be added to check if the value passed to addFunction() does not have sig defined, and report something more useful to the user. See #17264

コントリビューターガイド

技術スタック: ccppjavascriptwasm
領域: backendtoolingdeveloper experience
Issue 種別: bug
難度: 2
推定時間: under 1 hour
活動状況: stale
明確さ: clear
前提条件: JavaScriptEmscripten basics
初心者向け度: 70
調査方針: Locate the `reportUndefinedSymbols()` function in Emscripten's JavaScript runtime code. The function currently raises a cryptic 'sig is undefined' error when a function signature is not provided. Review the related discussion (#17266) and issue (#17264) for background. Add a check to verify that `sig` is defined before using it, and provide a more informative error message indicating which function lacks a signature. The fix is likely in a single file within the Emscripten source tree.