[Debian-on-mobile-maintainers] Bug#996699: Bug#996699: chatty: Cross-building fails to resolve libpurple-dev

[Helmut Grohne]

Control: tags -1 + patch

On Wed, Oct 20, 2021 at 02:59:14PM +0200, Helmut Grohne wrote:
> It's an Architecture: all package and those can never satisfy cross
> Build-Depends unless marked Multi-Arch: foreign. So clear thing, we mark
> it Multi-Arch: foreign and we're done, right? Unfortunately, not.
> libpurple-dev Depends on libpurple0 (among other things) and quite
> clearly, it exposes libpurple0. Since libpurple0 is
> architecture-dependent and exposed by libpurple-dev, libpurple-dev
> cannot be Multi-Arch: foreign. The thing is: When we issue a dependency
> on libpurple-dev (for a particular architecture), we want a matching
> libpurple0 (of the requested architecture). And this constraint cannot
> be transferred through Architecture: all packages. That issue is known
> as the "multiarch interpreter problem", because it happened with
> interpreters first. In any case, the canonical solution to this problem
> is to turn libpurple-dev Architecture: any. At that point the resolver
> will pick the host architecture libpurple-dev and the dependency will
> ensure that we also get the host architecture libpurple0.

I also said "don't file cross build bugs without a patch". Here you go.

Helmut
-------------- next part --------------
diff --minimal -Nru pidgin-2.14.7/debian/changelog pidgin-2.14.7/debian/changelog
--- pidgin-2.14.7/debian/changelog	2021-10-05 02:31:35.000000000 +0200
+++ pidgin-2.14.7/debian/changelog	2021-10-20 17:02:30.000000000 +0200
@@ -1,3 +1,10 @@
+pidgin (2.14.7-2.1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Convert libpidgin-dev to Architecture: any. (Closes: #996699)
+
+ -- Helmut Grohne <helmut at subdivi.de>  Wed, 20 Oct 2021 17:02:30 +0200
+
 pidgin (2.14.7-2) unstable; urgency=medium
 
   * Backport fix for XMPP double free (Closes: 995370)
diff --minimal -Nru pidgin-2.14.7/debian/control pidgin-2.14.7/debian/control
--- pidgin-2.14.7/debian/control	2021-01-23 06:14:46.000000000 +0100
+++ pidgin-2.14.7/debian/control	2021-10-20 17:02:29.000000000 +0200
@@ -153,11 +153,10 @@
 
 Package: libpurple-dev
 Section: libdevel
-Architecture: all
+Architecture: any
 Depends: libdbus-glib-1-dev,
          libglib2.0-dev,
-         libpurple0 (<< ${source:Upstream-Version}+1~),
-         libpurple0 (>= ${source:Upstream-Version}),
+         libpurple0 (= ${binary:Version}),
          pkg-config,
          ${misc:Depends},
 Description: multi-protocol instant messaging library - development files