C++ CMake to Makefile-Makefile给出'collect2:错误：ld返回1退出状态`

我试图通过以下示例熟悉Cmake： 简而言之，我有这个C++代码。我想使用Cmake为这段代码生成一个makefile，然后运行这个makefile。不幸的是，生成的Makefile给出了一个错误。我正在使用Windows7

这是我正在使用的代码

文件：main.cpp

#include "ToDo.h"
int main(  int    argc,  char** argv)
{
    ToDo list;

    return 0;
}

#include "ToDo.h"


ToDo::ToDo()
{
}

ToDo::~ToDo()
{
}
#endif // TODO_H

文件：ToDo.h

#ifndef TODO_H
#define TODO_H

class ToDo
{
public:
    ToDo();
    ~ToDo();
};

文件：ToDo.cpp

#include "ToDo.h"
int main(  int    argc,  char** argv)
{
    ToDo list;

    return 0;
}

#include "ToDo.h"


ToDo::ToDo()
{
}

ToDo::~ToDo()
{
}
#endif // TODO_H

这是myCMakeLists.txt

project("To Do List")


add_executable(toDo main.cpp ToDo.cpp)

这就是我在cygwin所做的

admin@US01WKS03044 /cygdrive/c/CmakeTest/build
$ cmake -G "Unix Makefiles" ..
-- The C compiler identification is unknown
-- The CXX compiler identification is GNU 4.9.2
-- Check for working C compiler: C:/cygwin64/bin/cc
-- Check for working C compiler: C:/cygwin64/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - failed
-- Check for working CXX compiler: C:/cygwin64/bin/c++.exe
-- Check for working CXX compiler: C:/cygwin64/bin/c++.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - failed
-- Detecting CXX compile features
-- Detecting CXX compile features - failed
-- Configuring done
-- Generating done
-- Build files have been written to: C:/CmakeTest/build

admin@US01WKS03044 /cygdrive/c/CmakeTest/build
$ ls
cmake_install.cmake  CMakeCache.txt  CMakeFiles  Makefile

admin@US01WKS03044 /cygdrive/c/CmakeTest/build
$ make VERBOSE=1
"C:/Program Files (x86)/CMake/bin/cmake.exe" -HC:/CmakeTest -BC:/CmakeTest/build --check-build-system CMakeFiles/Makefile.cmake 0
"C:/Program Files (x86)/CMake/bin/cmake.exe" -E cmake_progress_start C:/CmakeTest/build/CMakeFiles C:/CmakeTest/build/CMakeFiles/progress.marks
/usr/bin/make -f CMakeFiles/Makefile2 all
make[1]: Entering directory `/cygdrive/c/CmakeTest/build'
/usr/bin/make -f CMakeFiles/toDo.dir/build.make CMakeFiles/toDo.dir/depend
make[2]: Entering directory `/cygdrive/c/CmakeTest/build'
"C:/Program Files (x86)/CMake/bin/cmake.exe" -E cmake_depends "Unix Makefiles" C:/CmakeTest C:/CmakeTest C:/CmakeTest/build C:/CmakeTest/build C:/CmakeTest/build/CMakeFiles/toDo.dir/DependInfo.cmake --color=
Dependee "C:/CmakeTest/build/CMakeFiles/toDo.dir/DependInfo.cmake" is newer than depender "C:/CmakeTest/build/CMakeFiles/toDo.dir/depend.internal".
Dependee "C:/CmakeTest/build/CMakeFiles/CMakeDirectoryInformation.cmake" is newer than depender "C:/CmakeTest/build/CMakeFiles/toDo.dir/depend.internal".
Scanning dependencies of target toDo
make[2]: Leaving directory `/cygdrive/c/CmakeTest/build'
/usr/bin/make -f CMakeFiles/toDo.dir/build.make CMakeFiles/toDo.dir/build
make[2]: Entering directory `/cygdrive/c/CmakeTest/build'
"C:/Program Files (x86)/CMake/bin/cmake.exe" -E cmake_progress_report C:/CmakeTest/build/CMakeFiles 1
[ 50%] Building CXX object CMakeFiles/toDo.dir/main.cpp.o
C:/cygwin64/bin/c++.exe     -o CMakeFiles/toDo.dir/main.cpp.o -c C:/CmakeTest/main.cpp
"C:/Program Files (x86)/CMake/bin/cmake.exe" -E cmake_progress_report C:/CmakeTest/build/CMakeFiles 2
[100%] Building CXX object CMakeFiles/toDo.dir/ToDo.cpp.o
C:/cygwin64/bin/c++.exe     -o CMakeFiles/toDo.dir/ToDo.cpp.o -c C:/CmakeTest/ToDo.cpp
Linking CXX executable toDo.exe
"C:/Program Files (x86)/CMake/bin/cmake.exe" -E remove -f CMakeFiles/toDo.dir/objects.a
C:/cygwin64/bin/ar.exe cr CMakeFiles/toDo.dir/objects.a @CMakeFiles/toDo.dir/objects1.rsp
C:/cygwin64/bin/c++.exe     -Wl,--whole-archive CMakeFiles/toDo.dir/objects.a -Wl,--no-whole-archive  -o toDo.exe -Wl,--out-implib,libtoDo.dll.a -Wl,--major-image-version,0,--minor-image-version,0
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/../../../../lib/libcygwin.a(libcmain.o): In function `main':
/usr/src/debug/cygwin-1.7.33-1/winsup/cygwin/lib/libcmain.c:39: undefined reference to `WinMain'
/usr/src/debug/cygwin-1.7.33-1/winsup/cygwin/lib/libcmain.c:39:(.text.startup+0x7e): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `WinMain'
collect2: error: ld returned 1 exit status
make[2]: *** [toDo.exe] Error 1
make[2]: Leaving directory `/cygdrive/c/CmakeTest/build'
make[1]: *** [CMakeFiles/toDo.dir/all] Error 2
make[1]: Leaving directory `/cygdrive/c/CmakeTest/build'
make: *** [all] Error 2

---

为什么生成文件失败？

该错误意味着编译器正在寻找

WinMain

作为可执行文件的入口点，而不是经典的

main

，并且它找不到它

---

由于我不使用cygwin，所以我无法解释原因（如果我没有弄错的话，WinMain是特定于windows gui应用的），但您可以将

main

重命名为

WinMain

，看看它是否有效。或者看看。

你不应该发布一些cmakelists.txt文件吗？是的，我忘了。发布它-当您在评论时不知道为什么downvoteThe错误是

/usr/src/debug/cygwin-1.7.33-1/winsup/cygwin/lib/libcmain.c:39:未定义对
WinMain'
的引用。我不知道为什么会这样。您是否未能链接到某些Windows库？您是否未能提供一些标准的Windows入口点（即
WinMain`）？首先：您是否需要TODO.cpp末尾的#endif//TODO_H？第二：我在这里使用linux，一切都可以很好地编译，在windows中，您可能需要向编译器添加额外的参数（请参阅mingw关于它们），并添加可执行的额外参数，如“WIN32”（请参阅文档）。在windows中从cmd运行时，它会提供相同的行为