未定义的引用.在 cmake 中:lib 到 lib [英] Undefined reference to. In cmake: lib to lib

问题描述

Windows 7 x86，cmake 版本 3.15.2、4.10 qtcreator、Qt5.12.4 MinGW.我用两个库构建了一个项目，在其中一个库中，我从另一个调用了一个类.结果，我得到了一个错误.

Windows 7 x86, cmake version 3.15.2, 4.10 qtcreator, Qt5.12.4 MinGW. I build a project with two libraries, and in one of them I call a class from the other. As a result, I get an error.

...file2.cpp:-1: ошибка: undefined reference to `MyClass1::MyClass1()'
collect2.exe:-1: ошибка: error: ld returned 1 exit status

[ 91%] Linking CXX executable flasher.exe
lib2/liblib2.a(file2.cpp.obj):file2.cpp:(.text+0x18): undefined reference to `MyClass1::MyClass1()'
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[2]: *** [CMakeFiles\my.dir\build.make:107: flasher.exe] Error 1
mingw32-make.exe[1]: *** [CMakeFiles\Makefile2:83: CMakeFiles/my.dir/all] Error 2
mingw32-make.exe: *** [Makefile:83: all] Error 2

最小可重现示例:githab.com Src.

推荐答案

链接器无法解析 myclass1 的构造函数.这可能意味着没有定义或您没有链接库.确保您有构造函数的函数体，并且给定的库文件已链接.

The Linker can not resolve the constructor for myclass1. This could mean no definition or you did not Link the library. Make sure you have a function body for the constructor and that the given library file is linked.

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