Install GTK3/GTK4 in MSYS2 on WINE on Linux to Cross-Compile to Windows

main.sh

#!/bin/bash

# Be sure to run in a fresh WINEPREFIX!

# Install native dependencies
dnf update -y
dnf install -y curl wine

# Install MSYS2
curl -L -o /tmp/msys2.exe 'https://github.com/msys2/msys2-installer/releases/download/2021-11-30/msys2-base-x86_64-20211130.sfx.exe'
wine64 /tmp/msys2.exe x -y -oC:/

# Fix MSYS2
sed -i ~/.wine/drive_c/msys64/etc/pacman.conf -e 's/SigLevel    = Required/SigLevel = Never/g'
cat /etc/pki/tls/certs/ca-bundle.crt >~/.wine/drive_c/msys64/usr/ssl/certs/ca-bundle.crt
cat /etc/pki/tls/certs/ca-bundle.trust.crt >~/.wine/drive_c/msys64/usr/ssl/certs/ca-bundle.trust.crt
export WINEPATH='c:\msys64\usr\bin'

# Install GCC, Go and GTK
rm -f ~/.wine/drive_c/msys64/var/lib/pacman/db.lck
wine64 bash.exe -c 'pacman --verbose --debug --noconfirm --ignore pacman --needed -S mingw-w64-x86_64-gcc mingw-w64-x86_64-go mingw-w64-x86_64-pkg-config mingw-w64-x86_64-gtk4 mingw-w64-x86_64-gtk3 mingw-w64-x86_64-gobject-introspection mingw-w64-x86_64-gobject-introspection-runtime mingw-w64-x86_64-glib2'
sed -i ~/.wine/drive_c/msys64/mingw64/lib/pkgconfig/* -e 's/-Wl,-luuid/-luuid/g' # See https://github.com/gotk3/gotk3/wiki/Installing-on-Windows#chocolatey, fails with invalid flag in pkg-config --libs: -Wl,-luuid otherwise

# GTK3 (gotk3)

# Build
git clone https://github.com/gotk3/gotk3-examples.git /tmp/gotk3-examples
cd /tmp/gotk3-examples/ || exit
go mod init github.com/gotk3/gotk3-examples
wine64 bash.exe -c 'export PATH="$PATH:/mingw64/bin" && export GOPATH="/c/users/root/go" && export GOROOT="/mingw64/lib/go" && export GOARCH=amd64 && go get -v -x github.com/gotk3/gotk3/gtk/...@latest'
wine64 bash.exe -c 'export PATH="$PATH:/mingw64/bin" && export GOPATH="/c/users/root/go" && export GOROOT="/mingw64/lib/go" && export GOARCH=amd64 && go build -x -v -o out/gtk3-simple.exe ./gtk-examples/simple'

# Package (you can distribute the resulting .zip)
cp ~/.wine/drive_c/msys64/mingw64/bin/{libwinpthread-1.dll,libpcre-1.dll,libiconv-2.dll,libintl-8.dll,libglib-2.0-0.dll,libcairo-gobject-2.dll,libffi-7.dll,libgobject-2.0-0.dll,libgcc_s_seh-1.dll,libcairo-2.dll,libfontconfig-1.dll,libexpat-1.dll,libfreetype-6.dll,libpixman-1-0.dll,libpng16-16.dll,zlib1.dll,libgdk-3-0.dll,libepoxy-0.dll,libfribidi-0.dll,libgio-2.0-0.dll,libgmodule-2.0-0.dll,libgdk_pixbuf-2.0-0.dll,libpango-1.0-0.dll,libharfbuzz-0.dll,libthai-0.dll,libpangocairo-1.0-0.dll,libpangoft2-1.0-0.dll,libpangowin32-1.0-0.dll,libatk-1.0-0.dll,libgtk-3-0.dll,libbz2-1.dll,libbrotlidec.dll,libstdc++-6.dll,libgraphite2.dll,libdatrie-1.dll,libbrotlicommon.dll} out
cd out || exit
zip -FSr ../gtk3-simple.exe.zip .

# Run
WINEPATH="${PWD}" wine64 ./gtk3-simple.exe # Or try on a real Windows machine if it doesn't work here

# GTK3 & GTK4 (gotk4)

# Copy source code to directory on C drive
rm -rf ~/.wine/drive_c/users/root/Documents/gotk4-examples
mkdir -p ~/.wine/drive_c/users/root/Documents/gotk4-examples
git clone https://github.com/diamondburned/gotk4-examples.git ~/.wine/drive_c/users/root/Documents/gotk4-examples
mkdir -p ~/.wine/drive_c/users/root/go

# Build

# For GTK4
wine64 bash.exe -c 'export PATH="$PATH:/mingw64/bin" && export GOPATH="/c/users/root/go" && export GOROOT="/mingw64/lib/go" && export GOARCH=amd64 && rm go.* && go mod init github.com/diamondburned/gotk4-examples && cd /c/users/root/Documents/gotk4-examples && go get -v -x github.com/diamondburned/gotk4/pkg/gtk/v4@bab1b33bc5950af05801ea710e17470192b9c058'
wine64 bash.exe -c 'export PATH="$PATH:/mingw64/bin" && export GOPATH="/c/users/root/go" && export GOROOT="/mingw64/lib/go" && export GOARCH=amd64 && cd /c/users/root/Documents/gotk4-examples && go build -ldflags="-extld=clang -linkmode=external" -x -v -o out/gtk4-simple.exe ./gtk4/simple'

# For GTK3 (this does not work yet, see https://github.com/diamondburned/gotk4/issues/43)
wine64 bash.exe -c 'export PATH="$PATH:/mingw64/bin" && export GOPATH="/c/users/root/go" && export GOROOT="/mingw64/lib/go" && export GOARCH=amd64 && rm go.* && go mod init github.com/diamondburned/gotk4-examples && cd /c/users/root/Documents/gotk4-examples && go get -v -x github.com/diamondburned/gotk4/pkg/gtk/v3@bab1b33bc5950af05801ea710e17470192b9c058'
wine64 bash.exe -c 'export PATH="$PATH:/mingw64/bin" && export GOPATH="/c/users/root/go" && export GOROOT="/mingw64/lib/go" && export GOARCH=amd64 && cd /c/users/root/Documents/gotk4-examples && go build -ldflags="-extld=clang -linkmode=external" -x -v -o out/gtk3-simple.exe ./gtk3/simple'

# Copy binaries to staging directory
mkdir -p out
yes | cp -f ~/.wine/drive_c/users/root/Documents/gotk4-examples/out/* out

# Package (you can distribute the resulting .zip)

# For GTK4
cp ~/.wine/drive_c/msys64/mingw64/bin/{libwinpthread-1.dll,libpcre-1.dll,libiconv-2.dll,libintl-8.dll,libglib-2.0-0.dll,libcairo-gobject-2.dll,libffi-7.dll,libgobject-2.0-0.dll,libgcc_s_seh-1.dll,libcairo-2.dll,libfontconfig-1.dll,libexpat-1.dll,libfreetype-6.dll,libpixman-1-0.dll,libpng16-16.dll,zlib1.dll,libepoxy-0.dll,libfribidi-0.dll,libgio-2.0-0.dll,libgmodule-2.0-0.dll,libgdk_pixbuf-2.0-0.dll,libpango-1.0-0.dll,libharfbuzz-0.dll,libthai-0.dll,libpangocairo-1.0-0.dll,libpangoft2-1.0-0.dll,libpangowin32-1.0-0.dll,libatk-1.0-0.dll,libbz2-1.dll,libbrotlidec.dll,libstdc++-6.dll,libgraphite2.dll,libdatrie-1.dll,libbrotlicommon.dll,liblzo2-2.dll,libcairo-script-interpreter-2.dll,libvulkan-1.dll,libgraphene-1.0-0.dll,libgtk-4-1.dll} out
cp out/libvulkan-1.dll out/vulkan-1.dll
cd out || exit
zip -FSr ../gtk4-simple.exe.zip .

# For GTK3
cp ~/.wine/drive_c/msys64/mingw64/bin/{libwinpthread-1.dll,libpcre-1.dll,libiconv-2.dll,libintl-8.dll,libglib-2.0-0.dll,libcairo-gobject-2.dll,libffi-7.dll,libgobject-2.0-0.dll,libgcc_s_seh-1.dll,libcairo-2.dll,libfontconfig-1.dll,libexpat-1.dll,libfreetype-6.dll,libpixman-1-0.dll,libpng16-16.dll,zlib1.dll,libgdk-3-0.dll,libepoxy-0.dll,libfribidi-0.dll,libgio-2.0-0.dll,libgmodule-2.0-0.dll,libgdk_pixbuf-2.0-0.dll,libpango-1.0-0.dll,libharfbuzz-0.dll,libthai-0.dll,libpangocairo-1.0-0.dll,libpangoft2-1.0-0.dll,libpangowin32-1.0-0.dll,libatk-1.0-0.dll,libgtk-3-0.dll,libbz2-1.dll,libbrotlidec.dll,libstdc++-6.dll,libgraphite2.dll,libdatrie-1.dll,libbrotlicommon.dll} out
cd out || exit
zip -FSr ../gtk3-simple.exe.zip .

# Run

# For GTK4
WINEPATH="${PWD}" wine64 /gtk4-simple.exe # Or try on a real Windows machine if it doesn't work here

# For GTK3
WINEPATH="${PWD}" wine64 ./gtk3-simple.exe # Or try on a real Windows machine if it doesn't work here