Cross-compiling GTK application in command line

Technical Support
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1

Hi,

I’m trying to compile a GTK application through command line/Makefile without using any IDE. I’ve followed several posts that does it with Eclipse setting cflags and libs variables but I’m unable to make it work.

At this point:

  • GTK Application compiles (and works perfectly) from/to the host machine setting the PKG_CONFIG_PATH to my local path and then launching pkg-config --cflags gtk±3.0 and pkg-config --libs gtk±3.0. Compilation command is: gcc `pkg-config --cflags gtk±3.0 -o GtkExample GtkExample.c \pkg-config --libs gtk±3.0`
  • I’ve generated my oe-core sdk in ~/SDK_Angstrom instead of leaving the default one.
  • My SDK generates pkg-config but I don’t find any gtk there so I’m guessing that it uses the same gtk…pc

After I’ve sourced ~/Angstrom_SDK/environment-setup-armv7at2hf-neon-angstrom-linux-gnueabi, I’ve tried the following commands:

1st try: Try to configure pkg-config flags with mine.

$ pkg-config --cflags gtk±3.0
This returns that the package gtk±3.0 is not found in the search path.

2nd try: Try to compile directly:

${CC} ${CFLAGS} -c --sysroot=/home/alvaro/Angstrom_SDK/sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/ `/home/alvaro/Angstrom_SDK/sysroots/x86_64-angstromsdk-linux/usr/bin/pkg-config --cflags gtk±3.0` GtkExample.c -o GtkExample

This returns the same than the 1st with the addition if “gtk/gtk.h: No such file or directory”.

3rd try: Same commands but with gtk±2.0
Same results.

I’m guessing that it’s failing to get the include/libs for gtk for ARM from the SDK (which I’m unable to find). I also fail to understand if the .pc is the same because I don’t how by changing the pkgconfig path it does find the gtk pc in the Eclipse examples.

Thanks, Álvaro.

2

Hi

Could you double check that you really did build an SDK which installs the gtk+ libraries in the version you need.

An SDK built with ‘bitbake angstrom-lxde-image -c populate_sdk’ actually does provide the gtk±3.0.pc file and in one of the include paths provided with --cflags there is also the gtk/gtk.h file:

$ . environment-setup-armv7at2hf-neon-angstrom-linux-gnueabi 
$ echo $PKG_CONFIG_PATH
...sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/usr/lib/pkgconfig:.../sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/usr/share/pkgconfig
$ which pkg-config 
...sysroots/x86_64-angstromsdk-linux/usr/bin/pkg-config

$ pkg-config --libs gtk+-3.0
-lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 -latk-1.0 -lcairo-gobject -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lgobject-2.0 -lglib-2.0
$ pkg-config --libs gtk+-2.0
-lgtk-x11-2.0 -lgdk-x11-2.0 -lpangocairo-1.0 -latk-1.0 -lcairo -lgdk_pixbuf-2.0 -lgio-2.0 -lpangoft2-1.0 -lpango-1.0 -lgobject-2.0 -lglib-2.0 -lfontconfig -lfreetype

$ ls sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/usr/include/gtk-3.0/gtk/gtk.h
sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/usr/include/gtk-3.0/gtk/gtk.h

Max

3

Thanks Max. Lines 7 and and 12 report me an error so it seems that definitely something is wrong with my build.

Now that you mention it I’m unsure if my populate_sdk action was with the meta-toolchain-qt5… Could that explain it? Anyway, I’m rebuilding the environment (and is not using much from previous builds so it looks promising).

I’ll report any updates asap, thanks again! :slight_smile:

EDIT: Indeed, after rebuilding the sdk all files seem to be there, and compilation worked flawlessly!