對成員函數的未定義引用

Question

我剛剛以爲我解決了a problem，但它似乎又出現了另一個 - 或者至少在另一種形式中出現了同樣的問題。現在，當我嘗試重建一切，在回答這個問題的建議，所有Qt Creator中顯示的建立問題是一個行collect2: ld returned 1 exit status

下面是一些編譯輸出，我認爲可能是相關的：

Running build steps for project Othello-cmd... 
Starting: "C:/Qt/2010.05/mingw/bin/mingw32-make.exe" clean -w 
[snipped] 
C:/Qt/2010.05/mingw/bin/mingw32-make -f Makefile.Release clean 

Could Not Find C:\Users\Amos Ng\My Dropbox\School\College\2010.. Fall\CS 3A\Othello-cmd-build-desktop\debug\main.o   //this was in red 

mingw32-make[1]: Entering directory `C:/Users/Amos Ng/My Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd-build-desktop' 

del release\main.o release\board.o release\player.o release\referee.o release\misc.o release\humanplayer.o release\computerplayer.o release\chatter.o release\chatserver.o release\location.o 
mingw32-make[1]: Leaving directory `C:/Users/Amos Ng/My Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd-build-desktop' 

mingw32-make: Leaving directory `C:/Users/Amos Ng/My Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd-build-desktop' 

Could Not Find C:\Users\Amos Ng\My Dropbox\School\College\2010.. Fall\CS 3A\Othello-cmd-build-desktop\release\main.o 

//these next 3 lines are in blue 
The process "C:/Qt/2010.05/mingw/bin/mingw32-make.exe" exited normally. 
Configuration unchanged, skipping qmake step. 
Starting: "C:/Qt/2010.05/mingw/bin/mingw32-make.exe" -w 
mingw32-make: Entering directory `C:/Users/Amos Ng/My Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd-build-desktop' 
[snipped] 
//A bunch of lines similar to 
g++ -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_CORE_LIB -DQT_THREAD_SUPPORT -I"c:\Qt\2010.05\qt\include\QtCore" -I"c:\Qt\2010.05\qt\include" -I"c:\Qt\2010.05\qt\include\ActiveQt" -I"debug" -I"\\psf\Dropbox\School\College\2010.. Fall\CS 3A\Othello-cmd" -I"." -I"c: "filepath of .o file" "filepath of .cpp file" 

g++ -enable-stdcall-fixup -Wl,-enable-auto-import -Wl,-enable-runtime-pseudo-reloc -Wl,-subsystem,console -mthreads -Wl -o debug\Othello-cmd.exe object_script.Othello-cmd.Debug -L"c:\Qt\2010.05\qt\lib" -lQtCored4 

//everything's red starting here... 

./debug\board.o://psf/Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd/board.cpp:29: undefined reference to `OPiece::OPiece(int)' 

./debug\board.o://psf/Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd/board.cpp:39: undefined reference to `OPiece::flip()' 

./debug\board.o://psf/Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd/board.cpp:76: undefined reference to `OPiece::display()' 

./debug\board.o://psf/Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd/board.cpp:110: undefined reference to `OPiece::display()' 

./debug\board.o://psf/Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd/board.cpp:159: undefined reference to `OPiece::OPiece(int)' 

//couple more lines just like the above 

collect2: ld returned 1 exit status 

//...finally things are black again 

mingw32-make[1]: Leaving directory `C:/Users/Amos Ng/My Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd-build-desktop' 

mingw32-make: Leaving directory `C:/Users/Amos Ng/My Dropbox/School/College/2010.. Fall/CS 3A/Othello-cmd-build-desktop' 

//everything's red again 

mingw32-make[1]: *** [debug\Othello-cmd.exe] Error 1 

mingw32-make: *** [debug] Error 2 

The process "C:/Qt/2010.05/mingw/bin/mingw32-make.exe" exited with code %2. 
Error while building project Othello-cmd (target: Desktop) 
When executing build step 'Make' 

關於什麼可能導致此錯誤的任何想法？

編輯：我也想指出，我沒有找到「main.o」調試目錄內...

SOLUTION（不是真的）：我在Netbeans的重新編譯的一切，而不是（上儘管Mac，所以也許連接器是不同的......）。現在程序運行良好...再見Qt Creator

Answer 1

我會盡量猜測。您要麼使用命名空間錯誤（即將#include僞指令放在命名空間的主體中）。或者您還沒有完全按照您的建議刪除調試和發佈目錄。