Use mingw64 to compile c++ of dlib in windows

On the Internet, dlib is installed with Visual Studio. A visual studio 2019 installation package is more than 30G, and the relevant program can be compiled with mingw-w64.

Install MingW-W64

The msys2 used here: https://www.msys2.org/

Install msys2

Refer to the official website, for example, the installation location is c:\msys64\

Use domestic mirror source

c:\msys64\etc\pacman.d\
- mirrorlist.mingw32
- mirrorlist.mingw64
- mirrorlist.msys

Put Tsinghua source in the first line of these three files

# the CN mirror url
 Server = https://mirrors.tuna.tsinghua.edu.cn/msys2/mingw/i686/

Install mingw-w64

msys2 minGW 64-bit start menu

pacman -Syu
pacman -Su
pacman -S --needed base-devel mingw-w64-x86_64-toolchain

Add mingw64's gcc to windows environment variables

The address is C:\msys64\mingw64\bin , add environment variables to search by yourself

CUDA runtime library

The mingw compiler on the windows platform does not support CUDA, so even if you have a graphics card and CUDA, it will not install the CUDA version of dlib. At present, only visual studio supports CUDA on the windows platform.

Compile dlib as c library

Download the code and create related directories

cd /d d:\ 

git clone https://github.com/davisking/dlib.git

cd dlib
mkdir build
mkdir dist
cd build

Create compilation file

-G "MinGW Makefiles" This is the key, which means to generate Makefile files available for MinGW

cmake -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=D:\dlib\dist -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DCMAKE_BUILD_TYPE=Release -DCMAKE_MAKE=mingw32-make ..

No surprises, it will succeed

Compile 4 is the number of your cpu cores

mingw32-make -j4

installation

mingw32-make install

The final files will be in the d:\dlib\dist directory

Compile the wheel file of python

The file obtained by the following method is invalid. Don't try

If you have performed the above compilation, you need to clean up the build folder by yourself

Switch to the 19.20 branch

The latest version of the python package must be compiled with VS
19.20 can be compiled, but the red umbrella will be triggered when compiling, you can switch to 19.19

git checkout v19.20

Modify the source code

setup.py line 149

MinGW does not have parameters such as'-A' and'X64', and mingw's multi-thread compilation should be'-j'. So modify it as follows, comment out'-A','X64', and change it to 4-thread compilation.

 if platform.system() == "Windows":
            cmake_args += ['-DCMAKE_LIBRARY_OUTPUT_DIRECTORY_{}={}'.format(cfg.upper(), extdir)]
            # if sys.maxsize > 2**32:
            #     cmake_args += ['-A', 'x64']
            # # Do a parallel build
            # build_args += ['--', '/m']
            build_args += ['--', '-j4']

carried out

python setup.py -G "MinGW Makefiles" bdist_wheel

python package

dlib-19.19.0-cp37-cp37m-win_amd64.whl (3.7MB) dist directory is the windows version of dlib

pip install dlib-19.19.0-cp37-cp37m-win_amd64.whl

Installation of face_recognition can be directly successful

pip3 install face_recognition