add mingw build example

docs/README.mingw

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+Overview
+========
+
+FreeRDP can be built for Windows using llvm-mingw (https://github.com/mstorsjo/llvm-mingw) with both msvcrt and ucrt. 
+MinGW builds are not actively mantained at the moment and every once in a while the build process may stop working. Pull requests to maintain MinGW support.
+
+An example build system for LLVM-MinGW can be found here: https://github.com/FreeRDP/FreeRDP/tree/master/docs/mingw-example

docs/mingw-example/.gitignore

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+build
+.DS_Store

docs/mingw-example/Dockerfile

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+FROM ubuntu:22.04 as builder
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get update -qq
+RUN apt-get install -y xz-utils wget make nasm git ninja-build autoconf automake libtool texinfo help2man yasm gcc pkg-config
+
+# SETUP WORKSPACE
+WORKDIR /tmp
+# RUN wget https://github.com/mstorsjo/llvm-mingw/releases/download/20230320/llvm-mingw-20230320-ucrt-ubuntu-18.04-x86_64.tar.xz -O llvm.tar.xz && \
+RUN wget https://github.com/mstorsjo/llvm-mingw/releases/download/20230320/llvm-mingw-20230320-msvcrt-ubuntu-18.04-x86_64.tar.xz -O llvm.tar.xz && \
+  tar -xf llvm.tar.xz && \
+  cp -a /tmp/llvm-mingw-20230320-msvcrt-ubuntu-18.04-x86_64/* /usr/ && \
+  rm -rf /tmp/*
+
+RUN mkdir /src
+WORKDIR /src
+
+# SETUP TOOLCHAIN
+RUN mkdir /src/patch
+ARG ARCH
+ENV TOOLCHAIN_ARCH=$ARCH
+
+FROM builder as cmake-builder
+RUN apt-get install -y cmake
+COPY toolchain/cmake /src/toolchain/cmake
+ENV TOOLCHAIN_NAME=$TOOLCHAIN_ARCH-w64-mingw32
+ENV TOOLCHAIN_CMAKE=/src/toolchain/cmake/$TOOLCHAIN_NAME-toolchain.cmake
+
+FROM builder as meson-builder
+RUN apt-get install -y meson
+COPY toolchain/meson /src/toolchain/meson
+ENV TOOLCHAIN_MESON=/src/toolchain/meson/$TOOLCHAIN_ARCH.txt
+
+# BUILD ZLIB
+FROM cmake-builder AS zlib-build
+RUN git clone https://github.com/madler/zlib.git /src/zlib
+WORKDIR /src/zlib
+RUN git fetch; git checkout 04f42ceca40f73e2978b50e93806c2a18c1281fc
+RUN mkdir /src/zlib/build
+WORKDIR /src/zlib/build
+RUN cmake .. -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_CMAKE -G Ninja -Wno-dev -DCMAKE_INSTALL_PREFIX=/build -DCMAKE_BUILD_TYPE=Release
+RUN cmake --build . -j `nproc`
+RUN cmake --install .
+
+# BUILD OPENSSL
+FROM cmake-builder AS openssl-build
+RUN git clone https://github.com/janbar/openssl-cmake.git /src/openssl
+WORKDIR /src/openssl
+RUN mkdir /src/openssl/build
+WORKDIR /src/openssl/build
+RUN cmake .. -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_CMAKE -G Ninja -Wno-dev -DCMAKE_INSTALL_PREFIX=/build \
+             -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF
+RUN cmake --build . -j `nproc`
+RUN cmake --install . 
+
+# BUILD OPENH264
+FROM meson-builder AS openh264-build
+RUN git clone https://github.com/cisco/openh264 /src/openh264
+WORKDIR /src/openh264
+RUN git fetch; git checkout 0a48f4d2e9be2abb4fb01b4c3be83cf44ce91a6e
+RUN mkdir /src/openh264/out
+WORKDIR /src/openh264/out
+RUN meson .. . --cross-file $TOOLCHAIN_MESON --prefix=/build
+RUN ninja -j `nproc`
+RUN ninja install
+
+# # BUILD LIBUSB
+FROM cmake-builder AS libusb-build
+RUN git clone https://github.com/libusb/libusb.git /src/libusb
+WORKDIR /src/libusb
+RUN git fetch; git checkout 4239bc3a50014b8e6a5a2a59df1fff3b7469543b
+RUN mkdir m4; autoreconf -ivf
+RUN sed -i.bak "s/-mwin32//g" ./configure
+RUN sed -i.bak "s/--add-stdcall-alias//g" ./configure
+RUN ./configure --host=$TOOLCHAIN_NAME --prefix=/build
+RUN make -j `nproc` && make install
+
+# BUILD FAAC
+FROM cmake-builder AS faac-build
+RUN git clone https://github.com/knik0/faac.git /src/faac
+WORKDIR /src/faac
+RUN git fetch; git checkout 78d8e0141600ac006a94ac6fd5601f599fa5b65b
+RUN sed -i.bak "s/-Wl,--add-stdcall-alias//g" ./libfaac/Makefile.am
+RUN mkdir m4; autoreconf -ivf
+RUN sed -i.bak "s/-mwin32//g" ./configure
+RUN ./configure --host=$TOOLCHAIN_NAME --prefix=/build
+RUN make -j `nproc` && make install
+
+# BUILD FAAD2
+FROM cmake-builder AS faad2-build
+RUN git clone https://github.com/knik0/faad2.git /src/faad2
+WORKDIR /src/faad2
+RUN git fetch; git checkout 3918dee56063500d0aa23d6c3c94b211ac471a8c
+RUN sed -i.bak "s/-Wl,--add-stdcall-alias//g" ./libfaad/Makefile.am
+RUN mkdir m4; autoreconf -ivf
+RUN sed -i.bak "s/-mwin32//g" ./configure
+RUN ./configure --host=$TOOLCHAIN_NAME --prefix=/build
+RUN make -j `nproc` && make install
+
+# BUILD OPENCL-HEADERS
+FROM cmake-builder AS opencl-headers
+RUN git clone https://github.com/KhronosGroup/OpenCL-Headers.git /src/opencl-headers
+WORKDIR /src/opencl-headers
+RUN git fetch; git checkout 4fdcfb0ae675f2f63a9add9552e0af62c2b4ed30
+RUN mkdir /src/opencl-headers/build
+WORKDIR /src/opencl-headers/build
+RUN cmake .. -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_CMAKE -G Ninja -Wno-dev -DCMAKE_INSTALL_PREFIX=/build \
+             -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=OFF
+RUN cmake --build . -j `nproc`
+RUN cmake --install . 
+
+# BUILD OPENCL
+FROM cmake-builder AS opencl-build
+COPY --from=opencl-headers /build /build
+RUN git clone https://github.com/KhronosGroup/OpenCL-ICD-Loader.git /src/opencl
+WORKDIR /src/opencl
+RUN git fetch; git checkout b1bce7c3c580a8345205cf65fc1a5f55ba9cdb01
+RUN echo 'set_target_properties (OpenCL PROPERTIES PREFIX "")' >> CMakeLists.txt
+RUN mkdir /src/opencl/build
+WORKDIR /src/opencl/build
+RUN cmake .. -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_CMAKE -G Ninja -Wno-dev -DCMAKE_INSTALL_PREFIX=/build \
+             -DBUILD_SHARED_LIBS=OFF -DOPENCL_ICD_LOADER_DISABLE_OPENCLON12=ON  \
+             -DCMAKE_BUILD_TYPE=Release -DBUILD_TESTING=OFF \
+             -DCMAKE_C_FLAGS="${CMAKE_C_FLAGS} -I/build/include/" \
+             -DCMAKE_CXX_FLAGS="${CMAKE_CXX_FLAGS} -I/build/include/"
+RUN cmake --build . -j `nproc`
+RUN cmake --install . 
+
+# BUILD FREERDP
+FROM cmake-builder AS freerdp-build
+COPY --from=zlib-build /build /build
+COPY --from=openssl-build /build /build
+COPY --from=openh264-build /build /build
+COPY --from=libusb-build /build /build
+COPY --from=faac-build /build /build
+COPY --from=faad2-build /build /build
+COPY --from=opencl-build /build /build
+RUN git clone https://github.com/FreeRDP/FreeRDP.git /src/FreeRDP
+RUN mkdir /src/FreeRDP/build
+WORKDIR /src/FreeRDP/build
+
+ARG ARCH
+RUN /bin/bash -c "( [[ $ARCH == aarch64 ]] && printf 'arm64' || printf $ARCH ) > arch.txt"
+
+RUN bash -c "cmake .. -DCMAKE_TOOLCHAIN_FILE=$TOOLCHAIN_CMAKE -G Ninja -Wno-dev -DCMAKE_INSTALL_PREFIX=/build \
+             -DWITH_X11=OFF -DWITH_MEDIA_FOUNDATION=OFF -DBUILD_SHARED_LIBS=OFF -DCMAKE_BUILD_TYPE=Release \
+             -DUSE_UNWIND=OFF \
+             -DWITH_ZLIB=ON  -DZLIB_INCLUDE_DIR=/build  \
+             -DWITH_OPENH264=ON -DOPENH264_INCLUDE_DIR=/build/include -DOPENH264_LIBRARY=/build/lib/libopenh264.dll.a \
+             -DOPENSSL_INCLUDE_DIR=/build/include \
+             -DWITH_OPENCL=ON -DOpenCL_INCLUDE_DIR=/build/include -DOpenCL_LIBRARIES=/build/lib/OpenCL.a \
+             -DLIBUSB_1_INCLUDE_DIRS=/build/include/libusb-1.0 -DLIBUSB_1_LIBRARIES=/build/lib/libusb-1.0.a \
+             -DWITH_WINPR_TOOLS=OFF -DWITH_WIN_CONSOLE=ON -DWITH_PROGRESS_BAR=OFF \
+             -DWITH_FAAD2=ON -DFAAD2_INCLUDE_DIR=/build/include -DFAAD2_LIBRARY=/build/lib/libfaad.a \
+             -DWITH_FAAC=ON -DFAAC_INCLUDE_DIR=/build/include -DFAAC_LIBRARY=/build/lib/libfaac.a \
+						 -DCMAKE_SYSTEM_PROCESSOR=$( cat arch.txt ) \
+             -DCMAKE_C_FLAGS=\"${CMAKE_C_FLAGS} -static -Wno-error=incompatible-function-pointer-types -DERROR_OPERATION_IN_PROGRESS=0x00000149\" \
+						 "
+RUN cmake --build . -j `nproc`
+RUN cmake --install . 
+RUN cp -a /usr/$ARCH-w64-mingw32/bin/* /build/bin;

docs/mingw-example/_build.sh

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+#!/bin/sh
+
+rm -rf $(pwd)/build/$TARGET_ARCH
+mkdir -p $(pwd)/build/$TARGET_ARCH
+docker build -t win32-builder --build-arg ARCH .
+docker compose up dist-builder

docs/mingw-example/build_arm64.sh

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+#!/bin/sh
+
+export ARCH=aarch64 
+. ./_build.sh

docs/mingw-example/build_ia32.sh

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+#!/bin/sh
+
+export ARCH=i686
+. ./_build.sh

docs/mingw-example/build_x64.sh

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+#!/bin/sh
+
+export ARCH=x86_64 
+. ./_build.sh

docs/mingw-example/docker-compose.yml

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+version: '3'
+
+services:
+  dist-builder:
+    image: win32-builder
+    volumes:
+     - ./build:/out
+    command: bash -c "rm -rf /out/*; cp -a /build/bin/. /out/;"

docs/mingw-example/toolchain/cmake/aarch64-w64-mingw32-toolchain.cmake

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+set(CMAKE_C_COMPILER aarch64-w64-mingw32-gcc)
+set(CMAKE_CXX_COMPILER aarch64-w64-mingw32-g++)
+set(CMAKE_FIND_ROOT_PATH /usr/aarch64-w64-mingw32)
+
+execute_process(COMMAND which aarch64-w64-mingw32-windres OUTPUT_VARIABLE TOOLCHAIN_RC_COMPILER)
+execute_process(COMMAND which aarch64-w64-mingw32-dlltool OUTPUT_VARIABLE TOOLCHAIN_DLLTOOL)
+
+string(STRIP ${TOOLCHAIN_RC_COMPILER} TOOLCHAIN_RC_COMPILER)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_RC_COMPILER})
+
+string(STRIP ${TOOLCHAIN_DLLTOOL} TOOLCHAIN_DLLTOOL)
+set(DLLTOOL ${TOOLCHAIN_DLLTOOL})
+
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_SYSTEM_NAME Windows)

docs/mingw-example/toolchain/cmake/i686-w64-mingw32-toolchain.cmake

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+set(CMAKE_C_COMPILER i686-w64-mingw32-gcc)
+set(CMAKE_CXX_COMPILER i686-w64-mingw32-g++)
+set(CMAKE_FIND_ROOT_PATH /usr/i686-w64-mingw32)
+
+execute_process(COMMAND which i686-w64-mingw32-windres OUTPUT_VARIABLE TOOLCHAIN_RC_COMPILER)
+execute_process(COMMAND which i686-w64-mingw32-dlltool OUTPUT_VARIABLE TOOLCHAIN_DLLTOOL)
+
+string(STRIP ${TOOLCHAIN_RC_COMPILER} TOOLCHAIN_RC_COMPILER)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_RC_COMPILER})
+
+string(STRIP ${TOOLCHAIN_DLLTOOL} TOOLCHAIN_DLLTOOL)
+set(DLLTOOL ${TOOLCHAIN_DLLTOOL})
+
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_SYSTEM_NAME Windows)

docs/mingw-example/toolchain/cmake/x86_64-w64-mingw32-toolchain.cmake

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+set(CMAKE_C_COMPILER x86_64-w64-mingw32-gcc)
+set(CMAKE_CXX_COMPILER x86_64-w64-mingw32-g++)
+set(CMAKE_FIND_ROOT_PATH /usr/x86_64-w64-mingw32)
+
+execute_process(COMMAND which x86_64-w64-mingw32-windres OUTPUT_VARIABLE TOOLCHAIN_RC_COMPILER)
+execute_process(COMMAND which x86_64-w64-mingw32-dlltool OUTPUT_VARIABLE TOOLCHAIN_DLLTOOL)
+
+string(STRIP ${TOOLCHAIN_RC_COMPILER} TOOLCHAIN_RC_COMPILER)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_RC_COMPILER})
+
+string(STRIP ${TOOLCHAIN_DLLTOOL} TOOLCHAIN_DLLTOOL)
+set(DLLTOOL ${TOOLCHAIN_DLLTOOL})
+
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_SYSTEM_NAME Windows)

docs/mingw-example/toolchain/meson/aarch64.txt

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+[binaries]
+c = 'aarch64-w64-mingw32-gcc'
+cpp = 'aarch64-w64-mingw32-g++'
+ar = 'aarch64-w64-mingw32-ar'
+ld = 'aarch64-w64-mingw32-ld'
+strip = 'aarch64-w64-mingw32-strip'
+
+[host_machine]
+system = 'windows'
+cpu_family = 'aarch64'
+cpu = 'native'
+endian = 'little'
+
+[properties]
+platform = 'generic_aarch64'

docs/mingw-example/toolchain/meson/i686.txt

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+[binaries]
+c = 'i686-w64-mingw32-gcc'
+cpp = 'i686-w64-mingw32-g++'
+ar = 'i686-w64-mingw32-ar'
+ld = 'i686-w64-mingw32-ld'
+strip = 'i686-w64-mingw32-strip'
+
+[host_machine]
+system = 'windows'
+cpu_family = 'x86'
+cpu = 'native'
+endian = 'little'
+
+[properties]
+c_args = '-mno-avx512f'
+cpp_args = '-mno-avx512f'

docs/mingw-example/toolchain/meson/x86_64.txt

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+[binaries]
+c = 'x86_64-w64-mingw32-gcc'
+cpp = 'x86_64-w64-mingw32-g++'
+ar = 'x86_64-w64-mingw32-ar'
+ld = 'x86_64-w64-mingw32-ld'
+strip = 'x86_64-w64-mingw32-strip'
+
+[host_machine]
+system = 'windows'
+cpu_family = 'x86_64'
+cpu = 'native'
+endian = 'little'
+
+[properties]
+c_args = '-mno-avx512f'
+cpp_args = '-mno-avx512f'