Functions / symbols defined in sketch may override framework .a · esp8266/Arduino#8710

(2 comments) (0 reactions) (0 assignees)C++ (15,728 stars) (13,342 forks)batch import

component: corehelp wanted

説明

I tested the MCVE and OTA works again perfectly fine. I found the problem in my full sketch. I had a global object called crc32! The same name as the function name with problem. Sorry for bothering you and thank you @earlephilhower for your help. Closing this issue...

Originally posted by @kamran00f in https://github.com/esp8266/Arduino/issues/7651#issuecomment-707327428

コントリビューターガイド

技術スタック: cpp
領域: tooling
Issue 種別: bug
難度: 3
推定時間: 1-3 hours
活動状況: stale
明確さ: mostly clear
前提条件: basic C++ knowledgeArduino IDE familiarityESP8266 sketch structure
初心者向け度: 30
調査方針: Investigate how the ESP8266 Arduino core's build system handles symbol conflicts between user sketches and precompiled libraries (.a files). The issue mentions a global variable named 'crc32' overriding a framework function; examine the linking order and possible use of weak symbols. Look at the core's platform.txt or linker scripts to understand how symbols are resolved, and check if there is a need to prevent user symbols from overriding internal ones (e.g., using C++ namespaces or prefixing). Refer to the issue comment at https://github.com/esp8266/Arduino/issues/7651#issuecomment 707327428 for the user's self resolution.