我正在嘗試構建我的代碼。在我cmake ..從構建目錄做之后，我做了make -j8，我得到了
[ 90%] Building CXX object common/CMakeFiles/common.dir/src/utils/path_util.cpp.o
[ 95%] Linking CXX executable myproj
CMakeFiles/myproj.dir/main.cpp.o: In function `cv::String::~String()':
main.cpp:(.text._ZN2cv6StringD2Ev[_ZN2cv6StringD5Ev] 0x14): undefined reference to `cv::String::deallocate()'
CMakeFiles/myproj.dir/main.cpp.o: In function `cv::String::operator=(cv::String const&)':
main.cpp:(.text._ZN2cv6StringaSERKS0_[_ZN2cv6StringaSERKS0_] 0x28): undefined reference to `cv::String::deallocate()'
collect2: error: ld returned 1 exit status
CMakeFiles/myproj.dir/build.make:95: recipe for target 'myproj' failed
make[2]: *** [myproj] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/myproj.dir/all' failed
make[1]: *** [CMakeFiles/myproj.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
奇怪的是，我使用的代碼中沒有任何地方cv::String。
我也放了
#Search for dependencies
set(MIN_OPENCV_VERSION "3.4.11" CACHE STRING "OpenCV version")
find_package(OpenCV ${MIN_OPENCV_VERSION} REQUIRED
COMPONENTS core
PATHS /usr/local/opencv-${MIN_OPENCV_VERSION}
NO_DEFAULT_PATH
)
在幾個 CMakeLists.txt 檔案中，cmake 找到 opencv
可能是什么問題呢？
編輯
我將 VERBOSE 環境變數設定為 1，如此處所述
我得到了
[ 90%] Building CXX object common/CMakeFiles/common.dir/src/utils/path_util.cpp.o
cd /home/user/ws/src/build/common && /usr/bin/c -I/usr/local/include/eigen3 -isystem /usr/local/opencv-3.4.11/include -isystem /usr/local/opencv-3.4.11/include/opencv -I/home/user/ws/src/common/include -I/home/user/ws/src/common/src -isystem /usr/local -fPIC -o CMakeFiles/common.dir/src/utils/path_util.cpp.o -c /home/user/ws/src/common/src/utils/path_util.cpp
[ 95%] Linking CXX executable road_info
/usr/bin/cmake -E cmake_link_script CMakeFiles/myproj.dir/link.txt --verbose=1
/usr/bin/c -rdynamic CMakeFiles/myproj.dir/main.cpp.o -o myproj mainpub_lib/mainpub.a
CMakeFiles/myproj.dir/main.cpp.o: In function `cv::String::~String()':
main.cpp:(.text._ZN2cv6StringD2Ev[_ZN2cv6StringD5Ev] 0x14): undefined reference to `cv::String::deallocate()'
CMakeFiles/myproj.dir/main.cpp.o: In function `cv::String::operator=(cv::String const&)':
main.cpp:(.text._ZN2cv6StringaSERKS0_[_ZN2cv6StringaSERKS0_] 0x28): undefined reference to `cv::String::deallocate()'
collect2: error: ld returned 1 exit status
CMakeFiles/myproj.dir/build.make:95: recipe for target 'myproj' failed
make[2]: *** [myproj] Error 1
make[2]: Leaving directory '/home/user/ws/src/build'
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/myproj.dir/all' failed
make[1]: *** [CMakeFiles/myproj.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
uj5u.com熱心網友回復：
首先，感謝@fabian 的幫助和指點
我終于意識到問題不在我的問題上，main.cpp而是在 main 呼叫的 hpp 檔案中。該one.hpp檔案包含另一個導致問題的 hpp 檔案（當我評論它時，問題消失了）
所以我所做的是更改CMakeLists.txt第二級（處理有問題的 hpp 檔案的那個）并添加
target_link_libraries(mainpub PRIVATE ${OpenCV_LIBS})
有了這個問題就解決了
為了允許我做一個冗長的制作，export VERBOSE=1因為我的制作版本太舊了。通過詳細的輸出，我可以看到 mainpub 是唯一鏈接的庫
令我感到奇怪的是，即使出現問題，mainpub 顯然也在構建，而不是主構建被標記為有問題
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