C++ 从QMake到CMake。(不同的路径级别)
我正在尝试将一个多层次项目从QMake移植到CMake。(我试着先用一个简单的例子来说明) 下面显示了所需的结构: 根CMakeLists.txt的位置比main和lib的路径级别更高,这是一项要求C++ 从QMake到CMake。(不同的路径级别),c++,qt,cmake,C++,Qt,Cmake,我正在尝试将一个多层次项目从QMake移植到CMake。(我试着先用一个简单的例子来说明) 下面显示了所需的结构: 根CMakeLists.txt的位置比main和lib的路径级别更高,这是一项要求 ├── CMakeLists.txt ├── app02 │ ├── CMakeLists.txt │ └── main.cpp └── lib ├── CMakeLists.txt ├── myprint.cpp └── myprint.h 根CMakeLists
├── CMakeLists.txt
├── app02
│ ├── CMakeLists.txt
│ └── main.cpp
└── lib
├── CMakeLists.txt
├── myprint.cpp
└── myprint.h
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 ${QT5_LIBRARIES})
app002路径中的main.cpp是这样写的:
#include "../lib/myprint.h"
int main(int argc, char *argv[])
{
myPrint::print("This the second App");
}
下面是相应的CMakeLists.txt:
cmake_minimum_required(VERSION 3.13)
set(SOURCES
main.cpp
)
库路径包含以下文件:
myprint.h
#ifndef MYPRINT_H
#define MYPRINT_H
#include <QDebug>
#include <string>
class myPrint
{
public:
static void print(std::string toPrint) {
qDebug() << toPrint.c_str();
}
};
#endif // MYPRINT_H
以及相应的CMakeLists.txt
cmake_minimum_required(VERSION 3.13)
add_library(
thePrintLibrary
myprint.h
myprint.cpp
)
CMake预扫描运行正常,但在编译时,我会出现下一个错误:
[ 28%] Building CXX object app02/CMakeFiles/thePrintLibrary.dir/myprint.cpp.o
In file included from /home/enigma/APD_Programas/Port/test/lib/myprint.cpp:1:
/home/enigma/APD_Programas/Port/test/lib/myprint.h:4:10: fatal error: QDebug: No such file or directory
#include <QDebug>
^~~~~~~~
compilation terminated.
gmake[2]: *** [app02/CMakeFiles/thePrintLibrary.dir/build.make:63: app02/CMakeFiles/thePrintLibrary.dir/myprint.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:162: app02/CMakeFiles/thePrintLibrary.dir/all] Error 2
gmake: *** [Makefile:84: all] Error 2
[28%]构建CXX对象app02/cmakfiles/thePrintLibrary.dir/myprint.cpp.o
在/home/enigma/APD_Programas/Port/test/lib/myprint.cpp中包含的文件中:1:
/home/enigma/APD_Programas/Port/test/lib/myprint.h:4:10:致命错误:QDebug:没有这样的文件或目录
#包括
^~~~~~~~
编译终止。
gmake[2]:***[app02/CMakeFiles/thePrintLibrary.dir/build.make:63:app02/CMakeFiles/thePrintLibrary.dir/myprint.cpp.o]错误1
gmake[1]:***[CMakeFiles/Makefile2:162:app02/CMakeFiles/thePrintLibrary.dir/all]错误2
gmake:**[Makefile:84:all]错误2
有这么好的人来帮我吗
提前感谢drescherjm在评论中说,您的目标链接库中缺少Qt5::Core 首先添加:
find_package(Qt5Core REQUIRED)
然后替换:
target_link_libraries(${TARGET} thePrintLibrary ${QT5_LIBRARIES})
借
或替换
set(QT5_LIBRARIES Qt5::Widgets)
借
谢谢你们两位
但是,当我替换以下行时:
find_package(Qt5 REQUIRED COMPONENTS Widgets Core)
set(QT5_LIBRARIES Qt5::Core Qt5::Widgets)
我犯了同样的错误:-(
然后我在最终链接上遇到了下一个奇怪的错误:
[100%] Linking CXX executable app02Build
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/app02Build.dir/build.make:88: app02Build] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:74: CMakeFiles/app02Build.dir/all] Error 2
gmake: *** [Makefile:84: all] Error 2
谢谢大家,,
在你的帮助下,我发现了最后一次失败
在该路径分布中,我必须在add_可执行文件中提供完整的主路径
add_executable(${TARGET} app02/main.cpp)
也许有更好的解决方案,所以,如果有人想添加一些内容,
请,您很好我想除了Qt5::WidgetsThank,您还需要Qt5::Core谢谢,我做到了,但不要改变结果:-(我想您还需要Qt5CoreHi的find_package(),谢谢。我不知道为什么我的答案比您的答案高,我在论坛上是新手。非常感谢,我做到了,但我得到了同样的错误:-(您是否添加了行“find_package(Qt5Core REQUIRED)”?我添加了:find_package(Qt5 REQUIRED COMPONENTS Widgets Core)集合(Qt5_LIBRARIES Qt5::Core Qt5::Widgets)…产生相同的错误:-(当你提供的答案应该是问题的解决方案时,你不应该问问题。相反,如果问题与原来的问题不同,你可能需要问一个全新的问题。在这两种情况下,都很难帮助你,因为你没有小的例子。你可以复制t的错误。)原始问题是一个小Qt程序,其中只包含一个文件和一个int main(),一个CMakeLists.txt来演示问题。
(.text+0x20):未定义的对main'的引用是源代码中列出的包含int main()
的文件。我认为您缺少一个add\u子目录()CMakeLists.txt文件将main.cpp添加到Source的位置我是新加入论坛的,有点困惑,请原谅。我对一个简单的文件没有问题。问题出在树结构上。我已经编写了所有文件的代码。我不知道我是否可以在论坛中附加一个.zip和代码,所以这里是:
find_package(Qt5 REQUIRED COMPONENTS Widgets Core)
set(QT5_LIBRARIES Qt5::Core Qt5::Widgets)
[ 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>
target_link_libraries(thePrintLibrary ${QT5_LIBRARIES})
[100%] Linking CXX executable app02Build
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
gmake[2]: *** [CMakeFiles/app02Build.dir/build.make:88: app02Build] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:74: CMakeFiles/app02Build.dir/all] Error 2
gmake: *** [Makefile:84: all] Error 2
add_executable(${TARGET} app02/main.cpp)