使用CMAKE安装opencv 3.4.1和Qt 5.10 [英] install opencv 3.4.1 and Qt 5.10 with CMAKE

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问题描述

我安装了 Qt 5.10 最新版本和 opencv3.4.1 ，但是我无法使用 Cmake 在此版本的Qt中安装该库.有人可以帮助我在Windows 10 64位系统上执行此操作吗? 我也尝试过这部影片 https://www.youtube.com/watch?v=ZOSu-2Oju- A 在cmd步骤中我有这个(此链接中的图片) 时我所拥有的

在此链接中也

((( https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows ))我仔细地完成了所有步骤，但是在执行完这些步骤之后，我在opencv-build中没有找到文件夹bin，并且我的操作系统是Windows 10 64位，感谢您的帮助.

解决方案

注意:我的回答更多地基于 [GitHub ]:opencv/opencv-opencv-3.4.2.zip ，专门用于此任务)


构建过程已通过此阶段(嗯，在此点以下它失败了，我没有检查到底是为什么). 无论如何，我认为我使用的构建环境与建议的构建环境相距太远，所以我:

  • 下载的 CMake 3.6.3 Win x64 软件包(包含 cmake-gui -作为 cmdline 可以痛苦，尤其是对于那些不习惯的人)
  • 使用了 MinGW 5.3.0 (我的 Qt 安装的一部分)
    • g ++ 5.3.0

问题的核心(如注释中所述，或由 Google 指定错误)是 g ++ 编译器未使用 C ++ 11 标准(并且 protobuf 源代码需要它).
因此，我做了一些测试:将错误代码粘贴到文件中(并添加了虚拟 main )，并在2个 MinGW 安装中进行了尝试. /p>

code.cpp :

 template <typename char_type>
bool null_or_empty(const char_type* s) {
    return s == nullptr || *s == 0;
}

int main() {
    return 0;
}

输出:

 e:\Work\Dev\StackOverflow\q051629751>dir /b
build
build.bat
cmake-gui.exe - Shortcut.lnk
code.cpp
src

e:\Work\Dev\StackOverflow\q051629751>set _PATH=%PATH%

e:\Work\Dev\StackOverflow\q051629751>set PATH=%_PATH%;c:\Install\x64\MinGW32\MinGW32\7.2.0-posix-seh-rt_v5-rev1\mingw64\bin

e:\Work\Dev\StackOverflow\q051629751>"c:\Install\x64\MinGW32\MinGW32\7.2.0-posix-seh-rt_v5-rev1\mingw64\bin\g++" code.cpp

e:\Work\Dev\StackOverflow\q051629751>"c:\Install\x64\MinGW32\MinGW32\7.2.0-posix-seh-rt_v5-rev1\mingw64\bin\g++" --version
g++ (x86_64-posix-seh-rev1, Built by MinGW-W64 project) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


e:\Work\Dev\StackOverflow\q051629751>dir /b
a.exe
build
build.bat
cmake-gui.exe - Shortcut.lnk
code.cpp
src

e:\Work\Dev\StackOverflow\q051629751>del /q a.exe

e:\Work\Dev\StackOverflow\q051629751>set PATH=%_PATH%;c:\Install\Qt\Qt\Tools\mingw530_32\bin

e:\Work\Dev\StackOverflow\q051629751>"c:\Install\Qt\Qt\Tools\mingw530_32\bin\g++" code.cpp
code.cpp: In function 'bool null_or_empty(const char_type*)':
code.cpp:3:17: error: 'nullptr' was not declared in this scope
     return s == nullptr || *s == 0;
                 ^

e:\Work\Dev\StackOverflow\q051629751>"c:\Install\Qt\Qt\Tools\mingw530_32\bin\g++" --version
g++ (i686-posix-dwarf-rev0, Built by MinGW-W64 project) 5.3.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


e:\Work\Dev\StackOverflow\q051629751>"c:\Install\Qt\Qt\Tools\mingw530_32\bin\g++" code.cpp -std=c++0x

e:\Work\Dev\StackOverflow\q051629751>

如图所示，较早的 g ++ 需要-std=c++0x 明确.

在构建步骤之后，出现了与下图相同的错误(我直接在 protobuf 的目录中启动了 mingw32-make 之前建立的东西):

2.解决方案

这两者都是在 cmake-gui 级别完成的.设置路径后:

  • 点击"配置"
  • 进行所需的变量更改
  • 点击"生成"
    • 从控制台
  • 在构建目录中启动 mingw32-make

注释:

  • 由于我距离成为 CMake 专家还很遥远，因此在执行此操作之前，我先清空构建目录，以确保以前的构建没有剩余(当然，缺点是是所有操作都需要再次完成，通常需要很长时间)

  • 因为我没有启用并行构建，所以我没有等待完整的构建完成(因为这需要很长时间)，而只是检查它是否通过了这一点

2.1强制 C ++ 11 标准

点击"添加条目"并设置 [CMake 3.1]:CXX_STANDARD :

在下面，请注意，构建通过之前失败的地方:

2.2跳过 protobuf 构建

注释:

  • 在已发布的电影中，没有尝试进行 protobuf 构建(可能不在捆绑包中?)，这就是为什么不会弹出该错误的原因
  • 我不知道最终版本中将不提供哪些功能，因为我不知道
    • 使用了什么 protobuf
  • 我认为这更像是一种解决方法

搜索与 protobuf 相关的变量，并取消选中任何在 BUILD 或 WITH 组中的变量( 蓝色行):

同样的效果在下面- protobuf 构建不再发生(它紧随 libIlmImf 之后):

I install Qt 5.10 latest version and opencv3.4.1 and I couldn't install the library in this version of Qt with Cmake can anybody help me to do it on my windows 10 64-bit please? I tried with this video also https://www.youtube.com/watch?v=ZOSu-2Oju-A and in cmd step I have this (picture in this link)

in this link also (( https://wiki.qt.io/How_to_setup_Qt_and_openCV_on_Windows )) I do all steps carefully but I didn't found the folder bin in opencv-build after do the steps and My OS is windows 10 64-bit thanks for help.

解决方案

Note: I'm basing my answer more on [SO]: openCV mingw-32 error in cmd (the tools versions mentioned in the posted .pdf)

1. Preliminary considerations

At the beginning, I tried to build it using what I already had on my machine (Win 10):

  • CMake 3.6.4 (bundled by Android Studio - that I didn't updated for months BTW), cmdline - as there's no GUI
  • MinGW7.2.0 (that I built on my machine for a different task)
    • g++ 7.2.0
  • OpenCV 3.4.2 (downloaded [GitHub]: opencv/opencv - opencv-3.4.2.zip, specifically for this task)


The build process passed this stage (well, it failed somewhere below this point, I didn't check why exactly). Anyway, I thought that the build env that I used, and the suggested one were too far away, so I:

  • Downloaded CMake 3.6.3 Win x64 bundle (that contains cmake-gui - as cmdline can be a pain, especially for those that are not used to it)
  • Used MinGW 5.3.0 (part of my Qt installation)
    • g++ 5.3.0

The problem at its core (as specified in comments, or Googleing the error) is that the g++ compiler doesn't use the C++11 standard (and protobuf source code requires it).
So, I did a little test: pasted the faulty code in a file (and added a dummy main), and tried it with the 2 MinGW installations.

code.cpp:

template <typename char_type>
bool null_or_empty(const char_type* s) {
    return s == nullptr || *s == 0;
}

int main() {
    return 0;
}

Output:

e:\Work\Dev\StackOverflow\q051629751>dir /b
build
build.bat
cmake-gui.exe - Shortcut.lnk
code.cpp
src

e:\Work\Dev\StackOverflow\q051629751>set _PATH=%PATH%

e:\Work\Dev\StackOverflow\q051629751>set PATH=%_PATH%;c:\Install\x64\MinGW32\MinGW32\7.2.0-posix-seh-rt_v5-rev1\mingw64\bin

e:\Work\Dev\StackOverflow\q051629751>"c:\Install\x64\MinGW32\MinGW32\7.2.0-posix-seh-rt_v5-rev1\mingw64\bin\g++" code.cpp

e:\Work\Dev\StackOverflow\q051629751>"c:\Install\x64\MinGW32\MinGW32\7.2.0-posix-seh-rt_v5-rev1\mingw64\bin\g++" --version
g++ (x86_64-posix-seh-rev1, Built by MinGW-W64 project) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


e:\Work\Dev\StackOverflow\q051629751>dir /b
a.exe
build
build.bat
cmake-gui.exe - Shortcut.lnk
code.cpp
src

e:\Work\Dev\StackOverflow\q051629751>del /q a.exe

e:\Work\Dev\StackOverflow\q051629751>set PATH=%_PATH%;c:\Install\Qt\Qt\Tools\mingw530_32\bin

e:\Work\Dev\StackOverflow\q051629751>"c:\Install\Qt\Qt\Tools\mingw530_32\bin\g++" code.cpp
code.cpp: In function 'bool null_or_empty(const char_type*)':
code.cpp:3:17: error: 'nullptr' was not declared in this scope
     return s == nullptr || *s == 0;
                 ^

e:\Work\Dev\StackOverflow\q051629751>"c:\Install\Qt\Qt\Tools\mingw530_32\bin\g++" --version
g++ (i686-posix-dwarf-rev0, Built by MinGW-W64 project) 5.3.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


e:\Work\Dev\StackOverflow\q051629751>"c:\Install\Qt\Qt\Tools\mingw530_32\bin\g++" code.cpp -std=c++0x

e:\Work\Dev\StackOverflow\q051629751>

As seen, the older g++ needs -std=c++0x explicitly.

Following the build steps, I got the same error as in the image below (I launched mingw32-make directly in protobuf's dir, to skip all the other stuff built before it):

2. Solutions

Both are done at cmake-gui level. After setting the paths:

  • Hit "Configure"
  • Do the required variable changes
  • Hit "Generate"
  • Launch mingw32-make from console, in the build dir

Notes:

  • Since I'm very far away from being a CMake expert, before doing this, I empty the build dir to make sure that there's nothing left from previous build (of course the drawback is that everything is done again, which usually takes a long time)

  • Since I didn't enable parallel build, I didn't wait for the full build to finish (as it takes forever), but just checked that it passes this point

2.1 Force C++11 standard

Click "Add Entry" and set [CMake 3.1]: CXX_STANDARD:

And below, notice that the build passed point where it was failing before:

2.2 Skip protobuf build

Notes:

  • In the posted movie, there's no protobuf build attempted (probably it's not in the bundle?) that's why this error didn't pop up
  • I don't know what functionality will not be available in the final build, as I don't know what protobuf is used at
  • I consider this more like a workaround

Search for protobuf related variables, and uncheck any that are in the BUILD or WITH groups (the blue lines):

And again the effect is below - the protobuf build no longer takes place (it comes just after libIlmImf):

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