[英]Q_OBJECT does not name a type when converting a qmake project to cmake
I am trying to transition a shared library that uses Qt 5 and Q_OBJECT
from QMake to CMake 3.2. 我正在尝试将使用Qt 5和
Q_OBJECT
的共享库从QMake过渡到CMake 3.2。 Here is the current CMakeLists.txt
file: 这是当前的
CMakeLists.txt
文件:
cmake_minimum_required(VERSION 3.2.2)
project(core)
# 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_package(Qt5Core REQUIRED)
find_package(Qt5Gui REQUIRED)
find_package(Qt5Widgets REQUIRED)
find_package(Qt5Xml REQUIRED)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1y -pedantic-errors -Werror -Wextra -O2 -g -fno-omit-frame-pointer -Woverloaded-virtual")
add_definitions(-DCORE_LIBRARY)
add_definitions(-DQT_PLUGIN)
add_definitions(-DQT_NO_DEBUG)
add_definitions(-DQT_SHARED)
add_library( core SHARED
src/reflect/TypeRegistry.h
src/Profiler.h
src/reflect/typeIdMacros.h
src/reflect/Reflect.h
src/AdapterManager.h
src/core_api.h
src/core.h
src/EnvisionApplication.h
src/EnvisionException.h
src/EnvisionManager.h
src/EnvisionPlugin.h
src/PluginInfo.h
src/global.h
src/precompiled.h
src/TestEvent.h
src/TestRunner.h
src/PluginManager.h
src/EnvisionWindow.h
src/reflect/TypeRegistry.cpp
src/Profiler.cpp
src/AdapterManager.cpp
src/EnvisionException.cpp
src/EnvisionManager.cpp
src/core.cpp
src/EnvisionApplication.cpp
src/TestEvent.cpp
src/TestRunner.cpp
src/PluginManager.cpp
src/EnvisionWindow.cpp
src/global.cpp )
target_link_libraries(core Qt5::Core Qt5::Widgets Qt5::Xml Qt5::Gui)
With this CMakeLists.txt
file, I can run cmake
and it runs without any errors or warnings. 有了这个
CMakeLists.txt
文件,我可以运行cmake
,它可以运行而不会出现任何错误或警告。 However, when I run make
I get an error: 但是,当我运行
make
我得到一个错误:
$ make
[ 7%] Automatic moc for target core
Generating moc_EnvisionApplication.cpp
Generating moc_EnvisionWindow.cpp
Generating moc_TestRunner.cpp
[ 7%] Built target core_automoc
Scanning dependencies of target core
[ 14%] Building CXX object CMakeFiles/core.dir/src/reflect/TypeRegistry.cpp.o
[ 21%] Building CXX object CMakeFiles/core.dir/src/Profiler.cpp.o
[ 28%] Building CXX object CMakeFiles/core.dir/src/AdapterManager.cpp.o
[ 35%] Building CXX object CMakeFiles/core.dir/src/EnvisionException.cpp.o
[ 42%] Building CXX object CMakeFiles/core.dir/src/EnvisionManager.cpp.o
[ 50%] Building CXX object CMakeFiles/core.dir/src/core.cpp.o
In file included from /store/envision/envision/Core/src/core.cpp:27:0:
/store/envision/envision/Core/src/EnvisionWindow.h:30:1: error: expected class-name before ‘{’ token
{
^
/store/envision/envision/Core/src/EnvisionWindow.h:31:2: error: ‘Q_OBJECT’ does not name a type
Q_OBJECT
^
...
As you can see, the MOC is run, but it seems like the original header files with the Q_OBJECT
macro are passed as is to gcc and it naturally has no clue what Q_OBJECT
is and therefore fails. 如您所见,MOC已运行,但似乎带有
Q_OBJECT
宏的原始头文件按原样传递给了gcc,它自然不知道Q_OBJECT
是什么,因此失败了。 Perhaps the old build, QMake generated new header files and used those instead of the original ones, or avoided this issue in some other way. 也许是旧版本QMake生成了新的头文件并使用了这些头文件来代替原始头文件,或者以其他方式避免了此问题。
Any ideas how to resolve this issue? 任何想法如何解决这个问题? I looked on-line but didn't find a definitive answer and I feel like there should be a straight-forward solution.
我在线上看,但没有找到明确的答案,我觉得应该有一个简单的解决方案。 Hopefully I don't have to modify any source code as this is just a small part of a bigger project.
希望我不必修改任何源代码,因为这只是较大项目的一小部分。
I found the issue and it was quite silly, but I want to explain it just in case someone else runs into a similar problem while converting from QMake. 我发现了这个问题,这很愚蠢,但是我想解释一下,以防其他人从QMake转换时遇到类似的问题。
Since my code compiled just fine using QMake I didn't look inside the actual source file EnvisionWindow.h
that gcc complained about, thinking that it must be a build issue. 由于我的代码使用QMake编译得很好,因此我没有查看gcc抱怨的实际源文件
EnvisionWindow.h
,认为这一定是构建问题。 When I finally had a look, I saw that this file contains no includes, which is why the compiler couldn't find a definition for Q_OBJECT
. 当我最后看一看时,发现该文件不包含include,这就是为什么编译器找不到
Q_OBJECT
的定义的原因。
The reason it worked with QMake is because that build uses a precompiled header with the -include
flag used for each source file, thus injecting all necessary definitions. 它与QMake一起使用的原因是,该构建使用了预编译的标头,并在每个源文件中使用了
-include
标志,从而注入了所有必需的定义。 This is the behavior one gets automatically when using PRECOMPILED_HEADER = precompiled_header_name.h
in a QMake .pro
file. 这是在QMake
.pro
文件中使用PRECOMPILED_HEADER = precompiled_header_name.h
时自动获得的行为。 I wish QMake didn't do this, since all files in my project are supposed to explicitly include the precompiled header. 我希望QMake不会这样做,因为我项目中的所有文件都应该明确包含预编译的头文件。
Anyway, the solution was trivial: include the precompiled header in EnvisionWindow.h
and everything compiles just fine now. 无论如何,解决方案都是微不足道的:在
EnvisionWindow.h
包含预编译的头,现在一切都可以编译了。
Lesson learned: take the compiler error more literally. 经验教训:从字面上看编译器错误。
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