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# Cross Compile
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This manual explains the steps to prepare a basic cross compiling environment on Debian. The build will be installed to `/opt/W64-cross-compile`. If the destination folder is set up right, you do not need any root rights.
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The following packages are needed: (maybe wine is not anymore needed, haven't tested yet)
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- wine
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- wine64
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- mingw-w64
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- mingw-w64-tools
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- binutils-mingw-w64
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The following sources are needed:
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- [glib](https://gitlab.gnome.org/GNOME/glib)
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- [atk](https://gitlab.gnome.org/GNOME/atk)
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- [pango](https://gitlab.gnome.org/GNOME/pango)
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- [gdk-pixbuf](https://gitlab.gnome.org/GNOME/gdk-pixbuf)
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- [libepoxy](https://github.com/anholt/libepoxy)
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- [GTK+](https://www.gtk.org/)
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## Prepare the `cross-file.ini`
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This configuration file will be needed on all meson based builds.
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[host_machine]
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system = 'windows'
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cpu_family = 'x86_64'
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cpu = 'x86_64'
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endian = 'little'
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[properties]
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c_args = []
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c_link_args = []
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[binaries]
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c = '/usr/bin/x86_64-w64-mingw32-gcc'
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cpp = '/usr/bin/x86_64-w64-mingw32-g++'
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ar = '/usr/bin/x86_64-w64-mingw32-ar'
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strip = '/usr/bin/x86_64-w64-mingw32-strip'
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pkgconfig = '/usr/bin/x86_64-w64-mingw32-pkg-config'
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windres = '/usr/bin/x86_64-w64-mingw32-windres'
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ld = '/usr/bin/x86_64-w64-mingw32-ld'
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exe_wrapper = 'wine64'
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## lib-glib
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Compile the library using the following steps.
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mkdir build
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cd build
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meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
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mseon compile
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if an error like `glib/glibconfig.h:65:51: error: missing binary operator before token "("` occures edit the line and delete the **G_GNUC_EXTENSION** expression.
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meson install
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Because not all compiled `*.dll` files are installed into the destination we need to copy them manualy.
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cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
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## atk
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The flags -Dintrospection=false will tell meson to disable some building options. See the file `meson_options.txt` for some information. Compile the library using the following steps.
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mkdir build
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cd build
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PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release -Dintrospection=false -Ddocs=false --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
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meson compile
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meson install
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Copy manualy all compiled `*.dll` files to the destination
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cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
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## pango
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Compile the library using the following steps. This will also download and compile some more librarys like `libpng` and `cairo` librarys.
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mkdir build
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cd build
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PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
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meson compile
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In case of an error with unresolved symbols like undefined reference to '__strcat_chk'. You need to edit the `cross-file.ini` and add the linker flags/option `-lssp` to the `c_link_args` parameters. Remove the build directory and restart configuring and compiling this libraray again.
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meson install
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cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
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## gdk-pixbuf
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mkdir build
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cd build
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PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
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meson compile
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meson install
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cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
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## libepoxy
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mkdir build
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cd build
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PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
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meson compile
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meson install
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cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
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## GTK+-4
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### Configuration and Compilation of GTK
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mkdir build
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cd build
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PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ -Dmedia-gstreamer=disabled -Ddemos=false -Dbuild-examples=false -Dbuild-tests=false --cross-file ../../cross-file.ini
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meson compile
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If the compile process stops with error `../gdk/loaders/gdkjpeg.c:302:67: error: ‘free’ undeclared (first use in this function)` you need to add the line `#include <stdlib.h>`on top of the file, before the `#include <jpeglib.h>` line. Run the compile command again.
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meson install
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cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
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## GTK+-3
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### preparation beacuse of `wine`
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Copy all compiled executeble and library files into the wine windows/system folder.
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cp /opt/W64-cross-compile/bin/*.exe ~/.wine/drive_c/windows/system32/
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cp /opt/W64-cross-compile/lib/*.dll ~/.wine/drive_c/windows/system32/
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cp /usr/x86_64-w64-mingw32/lib/zlib1.dll ~/.wine/drive_c/windows/system32/
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### workaround for some issues
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Edit the file `gdk/win32/gdkprivate-win32.h` and search around line 300 for the following declaration. In some releases the compiler is missing the **extern** statement here.
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300 /* The singleton selection object pointer */
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301 extern GdkWin32Selection *_win32_selection;
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### compile first attempt
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Configure and compile the library.
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PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig ./configure --prefix=/opt/W64-cross-compile/ --host=x86_64-w64-mingw32
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touch gdk/win32/winpointer.h
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PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig make
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#### Compile Error: glib-compile-resources: file not found
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make[2]: Verzeichnis „/home/steffen/test/GTKCross/gtk+-3.24.1/gdk“ wird betreten
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/bin/bash: Zeile 1: /opt/W64-cross-compile/bin/glib-compile-resources: Datei oder Verzeichnis nicht gefunden
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GEN gdkresources.h
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/bin/bash: Zeile 1: /opt/W64-cross-compile/bin/glib-compile-resources: Datei oder Verzeichnis nicht gefunden
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make[2]: *** [Makefile:2243: gdkresources.h] Fehler 127
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Edit the file `gdk/Makefile` append the windows `.exe` extension at the place where `GLIB_COMPILE_RESOURCES` is defined.
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Find **all the other** `GLIB_COMPILE_RESOURCES` occurences and add the `wine` command prior to **all** `$(GLIB_COMPILE_RESOURCES)` calls.
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Try to compile.
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### fix and install the compilation
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/bin/bash: Zeile 1: ../../gtk/gtk-update-icon-cache.exe: Kann die Binärdatei nicht ausführen: Fehler im Format der Programmdatei
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make[3]: *** [Makefile:1673: install-update-icon-cache] Fehler 126
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Edit the Makefile in demos/gtk-demos and add in line the wine prefix where the `. Try to run the `make install`command and do the same for the next errors.
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/bin/bash: Zeile 1: ../../gtk/gtk-update-icon-cache.exe: Kann die Binärdatei nicht ausführen: Fehler im Format der Programmdatei
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make[5]: *** [Makefile:1184: install-update-icon-cache] Fehler 126
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make[5]: Verzeichnis „/home/steffen/gtkcrosscompile/gtk+-3.24.0/demos/widget-factory“ wird verlassen
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If the compilation did well copy all *.dll files into the destination.
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cp `find -name "*.dll"` /opt/W64-cross-compile/lib/
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