g++编译报错原因分析 expected unqualified-id before string constant

本文介绍了一个常见的编译错误“expected unqualified-id before string constant”的原因及解决方案。该错误通常是由于函数声明后遗漏了分号导致的。

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在代码编写完成之后,编译时发现如下错误:

 expected unqualified-id before string constant

错误查找:

很奇怪的错误,难道系统提供的头文件也会出错?

后来发现,在定义完函数之后,没有加" ; "


错误纠正:

在函数定义之后加上" ; "即可...

In file included from C:/Users/lenovo/AppData/Local/Arduino15/packages/esp32/tools/esp-x32/2405/xtensa-esp-elf/include/errno.h:9, from C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.3-cfea4f7c-v1\esp32/include/newlib/platform_include/errno.h:10, from C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.3-cfea4f7c-v1\esp32/include/lwip/port/esp32xx/include/arch/cc.h:12, from C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.3-cfea4f7c-v1\esp32/include/lwip/lwip/src/include/lwip/arch.h:48, from C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.3-cfea4f7c-v1\esp32/include/lwip/lwip/src/include/lwip/debug.h:40, from C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.3-cfea4f7c-v1\esp32/include/lwip/lwip/src/include/lwip/opt.h:52: C:/Users/lenovo/AppData/Local/Arduino15/packages/esp32/tools/esp-x32/2405/xtensa-esp-elf/include/sys/errno.h:7:8: error: expected unqualified-id before string constant 7 | extern "C" { | ^~~ C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.3-cfea4f7c-v1\esp32/include/lwip/port/esp32xx/include/arch/cc.h:20:8: error: expected unqualified-id before string constant 20 | extern "C" { | ^~~ C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.3-cfea4f7c-v1\esp32/include/lwip/lwip/src/include/lwip/arch.h:125:9: error: 'uint8_t' does not name a type 125 | typedef uint8_t u8_t; | ^~~~~~~ C:\Users\lenovo\AppData\Local\Arduino15\packages\esp32\tools\esp32-arduino-libs\idf-release_v5.3-cfea4f7c-v1\esp32/include/lwip/lwip/src/include/lwip/arch.h:108:1: note: 'uint8_t' is defined in header '<cstdint>'; did you forget t
03-25
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