On Sun, 2024-06-23 at 13:35 -0400, Eli Schwartz wrote: > There is a bug in how gtk 3 and gtk 4 are built against by other > packages. GTK supports optionally enabling X and wayland support -- when > you do so, the ABI of GTK changes. > > It is historically common for X11 packages to check for a macro provided > by GTK that says "built with X11 support". This goes back to the days > when X11 was the only backend shipped with GTK, and the main use of the > macro was to check whether to use X11 or rather to use, say, the win32 > or Quartz (macOS) backends. The pattern has continued now that Linux has > two backends. > > The result of this is that many packages really need to support their > own IUSE="X wayland" (because they can conditionally build code for > that) and also need to make sure that USE flag is actually respected. > Failure to do this means that when rebuilding GTK with different USE > flags, all applications linking to GTK need to be rebuilt too, but > portage doesn't know that. > > It also means that binhosts -- such as the one officially hosted by > Gentoo -- have bad binaries that don't actually match the packages users > have installed. This is particularly bad since it breaks expectations > and is quite hard to debug. This has hit people a bunch of times when > trying to install the xfce desktop environment, in particular.
<snip> > - What I propose in this patchset. Hack a custom gentoo feature into the > GTK headers. GTK normally behaves exactly as it's supposed to > upstream, but we add the ability to pass a define via `append-cflags` > that makes the GTK headers tell an outright lie and claim its API > doesn't exist. Which is what we want -- we want packages to be able to > compile *as if* GTK wasn't built with support for a given backend. > This disables the automagic as if option 1 (implementing configure > options) was carried out. Advantage: automatically support proper > control of features. Disadvantage: requires patching GTK and > then still adding workarounds for each package that needs it. Nice trick! I like it. Good work. :)
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