[Freewx-maint] Bug#645411: [libwxgtk2.8-0] support of multiarch same

[gregory hainaut]

Package: libwxgtk2.8-0
Version: 2.8.12.1-1.1
Severity: normal
Tags: patch

--- Please enter the report below this line. ---

Dears Maintainer,

Could you support multiarch same for wxwidget2.8. At least
libwxbase2.8-0 and libwxgtk2.8-0 (see attached patch but can probably
be extended to msw stuff). See here for some multiarch details:
http://wiki.debian.org/Multiarch/Implementation

The package was a tough one to convert. So the attached patch will need
a carefully review. I checked that the library are moved in the good
place and are co-installable (amd64 and i386). I also checked that
wx-config returns the good path.

Best regards,
Gregory

---

Here a short description of the patch

Control file:
* bump debhelper dependency to 8.1.3 to ${support
misc:Pre-Depends}.
* Add multiarch

Postinst and prerm files:
* Add a =MA string that will be replaced with the triplet value in the
  rule file.

Rule file:
* add --libdir=\$${exec_prefix}/lib/$(DEB_HOST_MULTIARCH) to wxbase and
  wxgtk configuration flags.
* install library into /usr/lib/$(DEB_HOST_MULTIARCH).
* Generating the postinst and prerm file.
* create a symlink $(objdir_gtk_shared)/lib/$(DEB_HOST_MULTIARCH) to
$(objdir_gtk_shared)/lib. It works around some issue with the build
system (see below).

---

Some details on the build system issue:
During the build, libraries are installed into the directory LIBDIRNAME
equal to $(wx_top_builddir)/lib (defined on
build/bakefiles/common.bkl). Various places in the configure script
(configure.in) expect libraries in $(wx_top_builddir)/lib
Unfortunately wx-config script rely on $libdir
(/usr/lib/$DEB_HOST_MULTIARCH) and probably others places. Python try
to look up include file from wx-config but fail because LIBDIRNAME is
different of $libdir.

In my opinion, it would be better to create a variable $(wx_top_libdir)
that depends on $libdir. But it becomes big changes on an already too
complex build process hence I just create a symlink to workaround the
issue.
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