Bug#881637: webkit2gtk FTCBFS: ruby build dependency unsatisfiable

[Helmut Grohne]

Source: webkit2gtk
Version: 2.18.2-1
Tags: patch
User: helmutg at debian.org
Usertags: rebootstrap

Hi Berto,

This is my last patch for improving webkit2gtk cross buildability for
now. It simply annotates the ruby build dependency with ":native". That
means that ruby should be installed for the build architecture rather
than the host architecture. Typically, you need libraries for the build
architecture and binaries for the host architecture. Many packages
containing executables are marked Multi-Arch: foreign, but for ruby (and
other interpreters) the story is not as clear and they are marked
Multi-Arch: allowed instead. Thus we need to choose the right one. In
this case, webkit2gtk only uses ruby for some scripts generating source
files, so the build architecture one is the one we need.

After applying all three patches, webkit2gtk will not cross build. It
won't even have satisfiable cross build depends. We don't have a
solution for gobject-introspection. There is no known way to generate
.typelib files in a pure cross compilation setting (i.e. without qemu).
The only realistic way to cross compile webkit2gtk is to add a build
profile that disables gobject-introspection. After doing so, you can
make dh_auto_build succeed, but the -dev packages still contain .gir
files that are no longer generated. Hector Oron is trying to find
someone to help with this issue (which affects any package integrating
with gobject-introspection).

Thanks for your prompt responses and help with making webkit2gtk cross
buildable.

Helmut
-------------- next part --------------
diff --minimal -Nru webkit2gtk-2.18.2/debian/changelog webkit2gtk-2.18.2/debian/changelog
--- webkit2gtk-2.18.2/debian/changelog	2017-10-27 15:05:15.000000000 +0200
+++ webkit2gtk-2.18.2/debian/changelog	2017-11-09 17:26:34.000000000 +0100
@@ -1,3 +1,10 @@
+webkit2gtk (2.18.2-1.1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Annotate ruby build-depends with :native. (Closes: #-1)
+
+ -- Helmut Grohne <helmut at subdivi.de>  Thu, 09 Nov 2017 17:26:34 +0100
+
 webkit2gtk (2.18.2-1) unstable; urgency=medium
 
   * New upstream release.
diff --minimal -Nru webkit2gtk-2.18.2/debian/control webkit2gtk-2.18.2/debian/control
--- webkit2gtk-2.18.2/debian/control	2017-10-27 15:05:15.000000000 +0200
+++ webkit2gtk-2.18.2/debian/control	2017-11-09 17:26:34.000000000 +0100
@@ -29,7 +29,7 @@
                gperf,
                bison,
                flex,
-               ruby,
+               ruby:native,
                libjpeg-dev,
                libpng-dev,
                libtasn1-6-dev,