Add a Win32 build.

This is in the form of some documentation and a Meson cross file.
I don't actually know if the video works, since I don't have working
good-enough OpenGL on my Windows VM and it doesn't work properly
in WINE.

diff --git a/cross-prepare.txt b/cross-prepare.txt
new file mode 100644 (file)
index 0000000..e986b7c
--- /dev/null
+++ b/cross-prepare.txt
@@ -0,0 +1,64 @@
+# This can probably be executed as a script instead of being run by hand,
+# but odds are something is going wrong, so I wouldn't recommend it. :-)
+# If this doesn't work for you, feel free to send corrections, but any
+# issues here do not count as a bug.
+
+# Create the directory
+sudo mkdir /opt/qt-cross
+sudo chown $USER /opt/qt-cross
+chmod 0755 /opt/qt-cross
+
+# Get MinGW
+sudo apt install wine64 g++-mingw-w64
+sudo update-alternatives --config x86_64-w64-mingw32-gcc  # choose posix
+sudo update-alternatives --config x86_64-w64-mingw32-g++  # choose posix
+
+# Build sqlite3
+wget https://www.sqlite.org/2023/sqlite-autoconf-3420000.tar.gz
+tar axvf sqlite-autoconf-3420000.tar.gz
+cd sqlite-autoconf-3420000
+./configure --host x86_64-w64-mingw32 --prefix /opt/qt-cross
+make -j32
+make install
+cd ..
+
+# Set up CMake cross-compiler file
+cat <<'EOF' >/tmp/profile.cmake
+set(CMAKE_SYSTEM_NAME Windows)
+set(TOOLCHAIN_PREFIX x86_64-w64-mingw32)
+set(CMAKE_C_COMPILER ${TOOLCHAIN_PREFIX}-gcc)
+set(CMAKE_CXX_COMPILER ${TOOLCHAIN_PREFIX}-g++)
+set(CMAKE_Fortran_COMPILER ${TOOLCHAIN_PREFIX}-gfortran)
+set(CMAKE_RC_COMPILER ${TOOLCHAIN_PREFIX}-windres)
+set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+set(CMAKE_FIND_ROOT_PATH /usr/x86_64-w64-mingw32)
+EOF
+
+# Build Qt (completely crazy)
+sudo apt-get build-dep qt6-base
+sudo apt install qt6-base-dev-tools
+apt-get source qt6-base
+cd qt6-base-6.4.2+dfsg
+wget https://download.firedaemon.com/FireDaemon-OpenSSL/openssl-1.1.1u.zip
+unzip openssl-1.1.1u.zip
+mkdir src/3rdparty/sqlite/
+cp ../sqlite-autoconf-3420000/sqlite3.[ch] src/3rdparty/sqlite/
+./configure -prefix /opt/qt-cross -no-feature-sql-odbc -platform linux-g++-64 -qt-host-path /usr -xplatform win32-g++ -device-option CROSS_COMPILE=x86_64-w64-mingw32- -release -opengl desktop -nomake examples -no-icu -- -DQT_FORCE_BUILD_TOOLS=ON  -DCMAKE_TOOLCHAIN_FILE=/tmp/profile.cmake -DQt6HostInfo_DIR=/usr/lib/x86_64-linux-gnu/cmake/Qt6HostInfo -DOPENSSL_ROOT_DIR=`pwd`/openssl-1.1 -DFEATURE_vulkan=OFF -DFEATURE_tabletevent=OFF
+ninja
+ninja install
+cd ..
+
+# Various hacks to get Qt build tools to run properly under Meson
+ln -s /usr/lib/qt6/libexec/uic /opt/qt-cross/bin/uic
+cp /usr/lib/gcc/x86_64-w64-mingw32/12-posix/{libstdc++-6,libgcc_s_seh-1}.dll /opt/qt-cross/bin
+cp /usr/x86_64-w64-mingw32/lib/libwinpthread-1.dll /opt/qt-cross/bin
+
+# Build FFmpeg
+git clone https://git.ffmpeg.org/ffmpeg.git
+cd ffmpeg
+./configure --prefix=/opt/qt-cross --disable-crystalhd --enable-cross-compile --disable-vaapi --disable-vdpau --target-os=mingw64 --cross-prefix=x86_64-w64-mingw32- --arch=x86_64
+make -j32
+make install
+cd ..

diff --git a/cross-win32.txt b/cross-win32.txt
new file mode 100644 (file)
index 0000000..e5fa194
--- /dev/null
+++ b/cross-win32.txt
@@ -0,0 +1,26 @@
+# See cross-prepare.txt for how to set up the environment if you don't
+# already have one. (It's not straightforward :-/ )
+#
+# Then: meson setup --cross-file cross-win32.txt build-win32 && ninja -C build-win32
+# Note that you'll need to copy and distribute the Qt DLLs together with the .exe file
+# if you want it to actually run.
+[binaries]
+c = 'x86_64-w64-mingw32-gcc'
+cpp = 'x86_64-w64-mingw32-g++'
+ar = 'x86_64-w64-mingw32-ar'
+strip = 'x86_64-w64-mingw32-strip'
+pkg-config = 'pkg-config'
+exe_wrapper = 'wine'
+qmake6 = ['wine', '/opt/qt-cross/bin/qmake6.exe']
+moc = ['wine', '/opt/qt-cross/bin/moc.exe']
+uic = ['wine', '/opt/qt-cross/bin/uic.exe']
+rcc = ['wine', '/opt/qt-cross/bin/rcc.exe']
+
+[host_machine]
+system = 'windows'
+cpu_family = 'x86_64'
+cpu = 'x86_64'
+endian = 'little'
+
+[properties]
+pkg_config_libdir = '/opt/qt-cross/lib/pkgconfig'