[英]From QMake to CMake. (Different path levels)
I'm trying to port a multilevel project from QMake to CMake.我正在尝试将多级项目从 QMake 移植到 CMake。 (I try to make it work a simple example first)
(我首先尝试使其成为一个简单的示例)
Below show I the desired structure:下面显示了我想要的结构:
The location of the root CMakeLists.txt a path level before than the main and the lib is a requirement根 CMakeLists.txt 的位置比 main 和 lib 之前的路径级别是一个要求
├── CMakeLists.txt
├── app02
│ ├── CMakeLists.txt
│ └── main.cpp
└── lib
├── CMakeLists.txt
├── myprint.cpp
└── myprint.h
The root CMakeLists.txt is so written:根 CMakeLists.txt 是这样写的:
cmake_minimum_required(VERSION 3.13)
set(CMAKE_PROJECT_NAME "testProject")
project(${CMAKE_PROJECT_NAME})
list(APPEND CMAKE_PREFIX_PATH "/home/enigma/Qt/5.15.2/gcc_64")
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_INCLUDE_CURRENT_DIR ON)
find_package(Qt5Widgets REQUIRED)
set(QT5_LIBRARIES Qt5::Widgets)
add_subdirectory(lib app02)
set(TARGET "app02Build")
add_executable(${TARGET} ${SOURCES})
target_link_libraries(${TARGET} thePrintLibrary ${QT5_LIBRARIES})
The main.cpp in app002 path is written so: app002 路径中的 main.cpp 是这样写的:
#include "../lib/myprint.h"
int main(int argc, char *argv[])
{
myPrint::print("This the second App");
}
And here is its correspondig CMakeLists.txt:这是其对应的 CMakeLists.txt:
cmake_minimum_required(VERSION 3.13)
set(SOURCES
main.cpp
)
The lib path contains the next files: lib 路径包含以下文件:
myprint.h myprint.h
#ifndef MYPRINT_H
#define MYPRINT_H
#include <QDebug>
#include <string>
class myPrint
{
public:
static void print(std::string toPrint) {
qDebug() << toPrint.c_str();
}
};
#endif // MYPRINT_H
myPrint.cpp我的打印文件
#include "myprint.h"
//yes, there is no more code :-)
and the corresponding CMakeLists.txt和相应的 CMakeLists.txt
cmake_minimum_required(VERSION 3.13)
add_library(
thePrintLibrary
myprint.h
myprint.cpp
)
The CMake prescan runs fine, but when I compile I become the next error: CMake 预扫描运行良好,但是当我编译时出现下一个错误:
[ 28%] Building CXX object app02/CMakeFiles/thePrintLibrary.dir/myprint.cpp.o
In file included from /home/enigma/APD_Programas/Port/test/lib/myprint.cpp:1:
/home/enigma/APD_Programas/Port/test/lib/myprint.h:4:10: fatal error: QDebug: No such file or directory
#include <QDebug>
^~~~~~~~
compilation terminated.
gmake[2]: *** [app02/CMakeFiles/thePrintLibrary.dir/build.make:63: app02/CMakeFiles/thePrintLibrary.dir/myprint.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:162: app02/CMakeFiles/thePrintLibrary.dir/all] Error 2
gmake: *** [Makefile:84: all] Error 2
Someone so kind to help me?有这么好心的人帮帮我吗?
Thanks in advance提前致谢
Has drescherjm say it in the comment, you're missing Qt5::Core in your target_link_libraries drescherjm 在评论中说过吗,您的 target_link_libraries 中缺少 Qt5::Core
first add:首先添加:
find_package(Qt5Core REQUIRED)
then replace:然后替换:
target_link_libraries(${TARGET} thePrintLibrary ${QT5_LIBRARIES})
by经过
target_link_libraries(${TARGET} thePrintLibrary ${QT5_LIBRARIES} Qt5::Core)
or replace或更换
set(QT5_LIBRARIES Qt5::Widgets)
by经过
set(QT5_LIBRARIES Qt5::Widgets Qt5::Core)
Thank you both,谢谢你们俩,
but when I replace the lines for:但是当我替换以下行时:
find_package(Qt5 REQUIRED COMPONENTS Widgets Core)
set(QT5_LIBRARIES Qt5::Core Qt5::Widgets)
I become the same error:-(我变成了同样的错误:-(
[ 28%] Building CXX object app02/CMakeFiles/thePrintLibrary.dir/myprint.cpp.o
In file included from /home/enigma/APD_Programas/Port/test/lib/myprint.cpp:1:
/home/enigma/APD_Programas/Port/test/lib/myprint.h:4:10: fatal error: QDebug: No such file or directory
#include <QDebug>
I tried to add the next sentence too: (because I suspect that the library don't link right to Qt)我也尝试添加下一句:(因为我怀疑该库没有正确链接到 Qt)
target_link_libraries(thePrintLibrary ${QT5_LIBRARIES})
then I get the next weird error on final linking:然后我在最终链接中得到下一个奇怪的错误:
[100%] Linking CXX executable app02Build
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/app02Build.dir/build.make:88: app02Build] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:74: CMakeFiles/app02Build.dir/all] Error 2
gmake: *** [Makefile:84: all] Error 2
Thank you all, I found the last fail, with your help.谢谢大家,在你们的帮助下,我找到了最后一次失败。
In that path distribution, I must supply the complete main path in add_executable.在该路径分布中,我必须在 add_executable 中提供完整的主路径。
add_executable(${TARGET} app02/main.cpp)
Perhaps is there a better solution, so, if somebody want add something, please, you're wellcomed也许有更好的解决方案,所以,如果有人想添加一些东西,请,你很高兴
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