Meson is definitely getting more traction in GNOME (and other projects), with many components adding support for it in parallel to autotools, or outright switching to it. There are still bugs, here and there, and we definitely need to improve build environments — like Continuous — to support Meson out of the box, but all in all I’m really happy about not having to deal with autotools any more, as well as being able to build the G* stack much more quickly when doing continuous integration.
Now that GTK+ has added Meson support, though, it’s time to go through the dependency chain in order to clean up and speed up the build in the lower bits of our stack. After an aborted attempt at porting GdkPixbuf, I decided to port Pango.
All in all, Pango proved to be an easy win; it took me about one day to port from Autotools to Meson, and most of it was mechanical translation from weird autoconf/automake incantations that should have been removed years ago1. Most of the remaining bits were:
- ensuring that both Autotools and Meson would build the same DSOs, with the same symbols
- generating the same introspection data and documentation
- installing tests and data in the appropriate locations
The results are a full Meson build that takes about the same time as
./autogen.sh to run:
* autogen.sh: * meson real 0m11.149s real 0m2.525s user 0m8.153s user 0m1.609s sys 0m2.363s sys 0m1.206s * make -j$(($(nproc) + 2)) * ninja real 0m9.186s real 0m3.387s user 0m16.295s user 0m6.887s sys 0m5.337s sys 0m1.318s -------------------------------------------------------------- * autotools * meson + ninja real 0m27.669s real 0m5.772s user 0m45.622s user 0m8.465s sys 0m10.698s sys 0m2.357s
Not bad for a day’s worth of work.
My plan would be to merge this in the
master branch pretty soon; I also
have a branch that drops Autotools entirely
but that can wait a cycle, as far as I’m concerned.
Now comes the hard part: porting libraries like GdkPixbuf, ATK, gobject-introspection, and GLib to Meson. There’s already a GLib port, courtesy of Centricular, but it needs further testing; GdkPixbuf is pretty terrible, since it’s a really old library; I don’t expect ATK and GObject introspection to be complicated, but the latter has a non-recursive Make layout that is full of bees.
It would be nice to get to GUADEC and have the
whole G* stack build with Meson and Ninja. If you want to help out, reach
#gtk+, on IRC or on Matrix.
The Windows support still checks for GCC 2.x or 3.x flags, for instance. ↩
development build systems meson pango gnome