Qt5、cmake 和 MinGW

Question

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

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时自动生成的（生成一个空窗口）。

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

我收到以下错误：

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!

所以它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在 Windows 中指定为环境变量？

我尝试了标准 Windows 命令提示符和 Qt 提供的命令提示符，结果相同。可以从 Windows 命令提示符构建，还是应该从 MinGW 的 shell 构建？

平台：
Qt 5.1
CMake 2.8.11.2
MinGW/GCC 4.8
视窗 7

Answer 1

在运行cmake 之前从PATH 中获取git 路径。

这是做到这一点的魔法：

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

Answer 2

这个 CMakeLists.txt 文件可以正常工作：

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)

变化是：

添加了find_package(Qt5Core REQUIRED)。
将Qt5::WinMain 添加到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：尽快重命名C:/Program Files (x86)/Git/bin/sh.exe。

例如：

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

但是不要忘记所有东西都是在什么时候建成的。再次正确重命名。