Qt5，cmake和MinGW

Question

我正在尝试用Qt 5和MinGW下的cmake构建一个“ Hello World”项目。
这是CMakeLists.txt文件（摘自在线文档）：

project(Qt5_cmake_test)

cmake_minimum_required(VERSION 2.8.11)

set(CMAKE_PREFIX_PATH "C:/Qt/Qt5.1.1/5.1.1/mingw48_32")

# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)

# Find the QtWidgets library
find_package(Qt5Widgets)

# Add the source files from the current directory
aux_source_directory(. SRC_LIST)

# Tell CMake to create the executable
add_executable(${PROJECT_NAME} WIN32 ${SRC_LIST})

# Use the Widgets module from Qt5
target_link_libraries(${PROJECT_NAME} Qt5::Widgets)

源代码是在创建新项目（这会产生一个空窗口）时自动生成的代码。

从Windows命令提示符配置： cmake -G "MinGW Makefiles" ..\\Qt5_cmake_test

我得到这些错误：

CMake Error at C:/Program Files (x86)/CMake 2.8/share/cmake-2.8/Modules/CMakeMinGWFindMake.cmake:20 (message):
  sh.exe was found in your PATH, here:

  C:/Program Files (x86)/Git/bin/sh.exe

  For MinGW make to work correctly sh.exe must NOT be in your path.

  Run cmake from a shell that does not have sh.exe in your PATH.

  If you want to use a UNIX shell, then use MSYS Makefiles.

Call Stack (most recent call first):
  CMakeLists.txt:8 (project)


CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
Missing variable is:
CMAKE_C_COMPILER_ENV_VAR
CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
Missing variable is:
CMAKE_C_COMPILER
CMake Error: Could not find cmake module file:C:/Users/pietro.mele/projects/tests/buildSystem_test/Qt5_cmake_test-build/CMakeFiles/2.8.11.2/CMakeCCompiler.cmake

CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
Missing variable is:
CMAKE_CXX_COMPILER_ENV_VAR
CMake Error: Error required internal CMake variable not set, cmake may be not be built correctly.
Missing variable is:
CMAKE_CXX_COMPILER
CMake Error: Could not find cmake module file:C:/Users/pietro.mele/projects/tests/buildSystem_test/Qt5_cmake_test-build/CMakeFiles/2.8.11.2/CMakeCXXCompiler.cma
ke
CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage
-- Configuring incomplete, errors occurred!

因此，似乎无法找到编译器。 有没有办法让cmake自己找到它，或者只是给它CMAKE_PREFIX_PATH目录？
我是否必须在makefile中手动指定所有这些变量，或者在Windows中将其指定为环境变量？

我从标准Windows命令提示符和Qt提供的命令提示符中都尝试了相同的结果。 是否可以从Windows命令提示符下进行构建，还是应该从MinGW的外壳中进行构建？

平台：
Qt 5.1
CMake 2.8.11.2
MinGW / GCC 4.8
Windows 7的

Answer 1

运行cmake之前，从PATH获取git路径。

这是这样做的魔力：

set PATH=%PATH:C:/Program Files (x86)/Git/bin;=%

Answer 2

此CMakeLists.txt文件可以正常运行：

project(Qt5_cmake_test)

cmake_minimum_required(VERSION 2.8.11)

set(CMAKE_PREFIX_PATH "C:/Qt/Qt5.1.1/5.1.1/mingw48_32")

# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)

# Find the Qt libraries
find_package(Qt5Core REQUIRED)
find_package(Qt5Widgets REQUIRED)

# Add the source files from the current directory
aux_source_directory(. SRC_LIST)

# Tell CMake to create the executable
add_executable(${PROJECT_NAME} WIN32 ${SRC_LIST})

# Use Qt5 modules
target_link_libraries(${PROJECT_NAME}
    Qt5::Widgets
    Qt5::WinMain)

更改为：

添加了find_package(Qt5Core REQUIRED) 。
新增Qt5::WinMain来target_link_libraries 。

Answer 3

在我对SO的一些回答中，我已经描述了。 CMake不喜欢sh.exe。

sh.exe was found in your PATH, here:

  C:/Program Files (x86)/Git/bin/sh.exe

解决方案：不久后重命名C:/Program Files (x86)/Git/bin/sh.exe 。

例如：

C:/Program Files (x86)/Git/bin/shxx.exe

但是，不要忘了何时构建了一切。 再次正确重命名。