> Way back when we first started the mingw project in Fedora we took the
> decision to maintain the mingw builds as separate source RPMs in Fedora.
> The rationale was that mingw support was a new concept to Fedora with
> many unknowns. We often had custom mingw only patches, and there was a
> decent chance there would be breakage upon rebases. We didn't want to
> burden the native package maintainers with mingw support as that would
> have increased pushback against the effort.
>
> This decision was always going to cause us problems with keeping the
> mingw dist-git packages in sync with native dist-git packages. This
> is especially important when it comes to security fixes, and there
> have been reasonably well justified complaints about mingw lagging
> native wrt to CVE fixing in recent times.
>
>
> Since the early days we merged the separate mingw32-$PKG / mingw64-$PKG
> source RPMS into a single mingw-$PKG in dist-git. The need for patching
> mingw RPMs to fix problems in Fedora doesn't seem any higher than the
> need for patching to fix native build problem. Generally things just
> work when rebasing, because most upstreams recognize the importance
> of keeping their projects working on mingw.
>
> IOW, we were afraid of a maintainer burden that has turned out to
> largely not exist. To address this non-existant burden, we intentionally
> made the maint of mingw packages harder than it needs to be in Fedora.
>
>
> This is a long winded way of saying I think it is time to update
> the mingw packaging guidelines to allow for, even recommend, mingw
> packaging to be a standard part of the native RPM spec. In doing
> so we eliminate the main burden of mingw packaging in Feora and
> guarantee that we'll always be up to date wrt bug/security fixes
> and rebases.
>
> I've done some basic tests with libvirt-glib upstream which recently
> changed to using Meson. Supporting mingw in the main libvirt-glib.spec
> was largely trivial. I simply needed to copy the various blocks of
> the mingw-libvirt-glib.spec file into the libvirt-glib.spec, ending
> up with a diff:
>
> diff --git a/libvirt-glib.spec.in b/libvirt-glib.spec.in
> index 58e6242..81f972b 100644
> --- a/libvirt-glib.spec.in
> +++ b/libvirt-glib.spec.in
> @@ -1,5 +1,15 @@
> # -*- rpm-spec -*-
>
> +%bcond_without mingw
> +
> +%define _with_mingw 0
> +%if 0%{?fedora}
> +%define _with_mingw 0%{with mingw}
> +%endif
> +
> +%define mingw32_pkg_name mingw32-%{name}
> +%define mingw64_pkg_name mingw64-%{name}
> +
> Name: libvirt-glib
> Version: @VERSION@
> Release: 1%{?dist}
> @@ -16,6 +26,16 @@ BuildRequires: libxml2-devel
> BuildRequires: vala-tools
> BuildRequires: gettext
>
> +%if %{_with_mingw}
> +BuildRequires: mingw32-filesystem
> +BuildRequires: mingw64-filesystem
> +BuildRequires: mingw32-glib2
> +BuildRequires: mingw64-glib2
> +BuildRequires: mingw32-libvirt
> +BuildRequires: mingw64-libvirt
> +%endif
> +
> +
> %package devel
> Summary: libvirt glib integration for events development files
> Requires: %{name} = %{version}-%{release}
> @@ -37,6 +57,42 @@ Requires: libvirt-gconfig-devel = %{version}-%{release}
> Requires: libvirt-gobject = %{version}-%{release}
> Requires: libvirt-devel
>
> +
> +%if %{_with_mingw}
> +
> +%package -n mingw32-libvirt-glib
> +Summary: MingwGW Windows libvirt-gconfig virtualization library
> +BuildArch: noarch
> +Requires: pkgconfig
> +
> +%package -n mingw32-libvirt-gconfig
> +Summary: MingwGW Windows libvirt-gconfig virtualization library
> +BuildArch: noarch
> +Requires: pkgconfig
> +
> +%package -n mingw32-libvirt-gobject
> +Summary: MingwGW Windows libvirt-gobject virtualization library
> +BuildArch: noarch
> +Requires: pkgconfig
> +
> +%package -n mingw64-libvirt-glib
> +Summary: MingwGW Windows libvirt-gconfig virtualization library
> +BuildArch: noarch
> +Requires: pkgconfig
> +
> +%package -n mingw64-libvirt-gconfig
> +Summary: MingwGW Windows libvirt-gconfig virtualization library
> +BuildArch: noarch
> +Requires: pkgconfig
> +
> +%package -n mingw64-libvirt-gobject
> +Summary: MingwGW Windows libvirt-gobject virtualization library
> +BuildArch: noarch
> +Requires: pkgconfig
> +
> +%endif
> +
> +
> %description
> This package provides integration between libvirt and the glib
> event loop.
> @@ -61,6 +117,31 @@ objects
> This package provides development header files and libraries for
> managing virtualization host objects
>
> +%if %{_with_mingw}
> +
> +%description -n mingw32-libvirt-glib
> +MinGW Windows libvirt-glib virtualization library.
> +
> +%description -n mingw32-libvirt-gconfig
> +MinGW Windows libvirt-gconfig virtualization library.
> +
> +%description -n mingw32-libvirt-gobject
> +MinGW Windows libvirt-gobject virtualization library.
> +
> +
> +%description -n mingw64-libvirt-glib
> +MinGW Windows libvirt-glib virtualization library.
> +
> +%description -n mingw64-libvirt-gconfig
> +MinGW Windows libvirt-gconfig virtualization library.
> +
> +%description -n mingw64-libvirt-gobject
> +MinGW Windows libvirt-gobject virtualization library.
> +
> +%{?mingw_debug_package}
> +%endif
> +
> +
> %prep
> %setup -q
>
> @@ -68,11 +149,23 @@ managing virtualization host objects
> %meson -Drpath=disabled
> %meson_build
>
> +%if %{_with_mingw}
> +%mingw_meson -Drpath=disabled -Ddocs=disabled
> +%mingw_ninja
> +%endif
> +
> %install
> %meson_install
>
> %find_lang %{name}
>
> +%if %{_with_mingw}
> +%mingw_ninja_install
> +
> +%mingw_find_lang libvirt-glib
> +%mingw_debug_install_post
> +%endif
> +
> %check
> %meson_test
>
> @@ -140,4 +233,87 @@ managing virtualization host objects
> %{_datadir}/vala/vapi/libvirt-gobject-1.0.deps
> %{_datadir}/vala/vapi/libvirt-gobject-1.0.vapi
>
> +
> +%if %{_with_mingw}
> +
> +%files -n mingw32-libvirt-glib -f mingw32-libvirt-glib.lang
> +%doc README COPYING AUTHORS NEWS
> +%{mingw32_bindir}/libvirt-glib-1.0-0.dll
> +
> +%{mingw32_libdir}/libvirt-glib-1.0.dll.a
> +
> +%{mingw32_libdir}/pkgconfig/libvirt-glib-1.0.pc
> +
> +%dir %{mingw32_includedir}/libvirt-glib-1.0
> +%dir %{mingw32_includedir}/libvirt-glib-1.0/libvirt-glib
> +%{mingw32_includedir}/libvirt-glib-1.0/libvirt-glib/libvirt-glib.h
> +%{mingw32_includedir}/libvirt-glib-1.0/libvirt-glib/libvirt-glib-*.h
> +
> +%files -n mingw64-libvirt-glib -f mingw64-libvirt-glib.lang
> +%doc README COPYING AUTHORS NEWS
> +%{mingw64_bindir}/libvirt-glib-1.0-0.dll
> +
> +%{mingw64_libdir}/libvirt-glib-1.0.dll.a
> +
> +%{mingw64_libdir}/pkgconfig/libvirt-glib-1.0.pc
> +
> +%dir %{mingw64_includedir}/libvirt-glib-1.0
> +%dir %{mingw64_includedir}/libvirt-glib-1.0/libvirt-glib
> +%{mingw64_includedir}/libvirt-glib-1.0/libvirt-glib/libvirt-glib.h
> +%{mingw64_includedir}/libvirt-glib-1.0/libvirt-glib/libvirt-glib-*.h
> +
> +
> +
> +%files -n mingw32-libvirt-gconfig
> +%{mingw32_bindir}/libvirt-gconfig-1.0-0.dll
> +
> +%{mingw32_libdir}/libvirt-gconfig-1.0.dll.a
> +
> +%{mingw32_libdir}/pkgconfig/libvirt-gconfig-1.0.pc
> +
> +%dir %{mingw32_includedir}/libvirt-gconfig-1.0
> +%dir %{mingw32_includedir}/libvirt-gconfig-1.0/libvirt-gconfig
> +%{mingw32_includedir}/libvirt-gconfig-1.0/libvirt-gconfig/libvirt-gconfig.h
> +%{mingw32_includedir}/libvirt-gconfig-1.0/libvirt-gconfig/libvirt-gconfig-*.h
> +
> +%files -n mingw64-libvirt-gconfig
> +%{mingw64_bindir}/libvirt-gconfig-1.0-0.dll
> +
> +%{mingw64_libdir}/libvirt-gconfig-1.0.dll.a
> +
> +%{mingw64_libdir}/pkgconfig/libvirt-gconfig-1.0.pc
> +
> +%dir %{mingw64_includedir}/libvirt-gconfig-1.0
> +%dir %{mingw64_includedir}/libvirt-gconfig-1.0/libvirt-gconfig
> +%{mingw64_includedir}/libvirt-gconfig-1.0/libvirt-gconfig/libvirt-gconfig.h
> +%{mingw64_includedir}/libvirt-gconfig-1.0/libvirt-gconfig/libvirt-gconfig-*.h
> +
> +
> +
> +%files -n mingw32-libvirt-gobject
> +%{mingw32_bindir}/libvirt-gobject-1.0-0.dll
> +
> +%{mingw32_libdir}/libvirt-gobject-1.0.dll.a
> +
> +%{mingw32_libdir}/pkgconfig/libvirt-gobject-1.0.pc
> +
> +%dir %{mingw32_includedir}/libvirt-gobject-1.0
> +%dir %{mingw32_includedir}/libvirt-gobject-1.0/libvirt-gobject
> +%{mingw32_includedir}/libvirt-gobject-1.0/libvirt-gobject/libvirt-gobject.h
> +%{mingw32_includedir}/libvirt-gobject-1.0/libvirt-gobject/libvirt-gobject-*.h
> +
> +%files -n mingw64-libvirt-gobject
> +%{mingw64_bindir}/libvirt-gobject-1.0-0.dll
> +
> +%{mingw64_libdir}/libvirt-gobject-1.0.dll.a
> +
> +%{mingw64_libdir}/pkgconfig/libvirt-gobject-1.0.pc
> +
> +%dir %{mingw64_includedir}/libvirt-gobject-1.0
> +%dir %{mingw64_includedir}/libvirt-gobject-1.0/libvirt-gobject
> +%{mingw64_includedir}/libvirt-gobject-1.0/libvirt-gobject/libvirt-gobject.h
> +%{mingw64_includedir}/libvirt-gobject-1.0/libvirt-gobject/libvirt-gobject-*.h
> +
> +%endif
> +
> %changelog
>
>
> Some notes:
>
> * We need to set mingw32_pkg_name/mingw64_pkg_name explicitly
> because the current logic that sets these doesn't work:
>
> %mingw32_pkg_name %(echo %{name} | sed 's/^mingw-/mingw32-/')
>
> Presumably we can fix that macro so that it does the right thing
> when no mingw- prefix exists in the first place
>
> * We can't use %mingw_package_header because that splatters the
> native debuginfo generation. So we must explicitly add mingw
> debuginfo packages by referencing
>
> %{?mingw_debug_package}
>
> and at end of %install add
>
> %mingw_debug_install_post
>
>
> * %mingw_package_header has reference to overriding strip/objdump
> to prevent corruption of binaries. We can't do that override
> because we need native strip/objdump for the native builds.
>
> AFAICT though, no corruption happened to my DLLs even without
> this strip/objdump override. Looks like this caveat might be
> obsolete, unless the scenarios it hits are more niche than I
> tested.
>
> * %mingw_package_header tries to disable the internal dependancy
> generator on RHEL 6. For reasons I don't understand, it ends
> up disabling it on Fedora too.
>
> %mingw_package_header \
> %global __strip %{mingw_strip} \
> %global __objdump %{mingw_objdump} \
> %if 0%{?rhel} == 6 \
> %global _use_internal_dependency_generator 0 \
> %global __find_requires %{mingw_findrequires} \
> %global __find_provides %{mingw_findprovides} \
> %endif \
> %global __debug_install_post %%{mingw_debug_install_post} \
> %{nil}
>
> Those three %global inside the rhel conditional *do* get
> evaluated on Fedora. We can see this in the old build logs
> in fact
>
>
> https://kojipkgs.fedoraproject.org/packages/mingw-libvirt-glib/4.0.0/1.fc...
>
> warning: Deprecated external dependency generator is used!
> Finding Provides: /usr/lib/rpm/mingw-find-provides.sh mingw32 mingw64
> ....
>
> When I hack macros.mingw to remove the dep generator override
> code entirely, almost everything still seems to work. rpm's
> built-in dep generator still adds the mingw32(libssp-0.dll)
> virtual deps. The only thing that gets lost is the dep on
> mingw-pkg-config
>
> IOW it looks like RPMs built-in dep generator pretty much does
> the right thing. Just need to add a manual mingw-pkg-config
> dep
>
> * Converting meson packages was easy because meson always uses
> a separate build dir. Many autoconf based packages default
> to building in the source dir. The first step would thus have
> to be to make the native build use a separate build dir. In
> theory this should be easy as mingw autoconf macros are
> already doing this, but I always expect dragons with autoconf.
>
Thanks for bringing this up Daniel. JFYI, I worked on adding support for
building mingw packages together with the native ones for SPICE a while ago,
and all of them worked just fine. For instance libgovirt still uses autotools,
so an extra patch to force out-of-tree build is added before the mingw bits:
https://src.fedoraproject.org/fork/etrunko/rpms/libgovirt/c/fcc00129cbfd0a6dff02e9959f12fce923fe3a85?branch=mingw
https://src.fedoraproject.org/fork/etrunko/rpms/libgovirt/c/01949d5249f9a1e233f5cff26b65fe532e891d0d?branch=mingw
>
> In summary based on my tests I think killing off the separate dist-git
> / RPM spec for mingw looks feasible unless someone knows of hidden
> show stoppers I haven't hit yet.
>
> I think we should go ahead and do this for some packages to demonstrate
> the concept in the real world, and I'm volunteering to coordinate it for
> all the virtualization packages I'm involved in maint of because I can't
> even reliably keep them in sync myself. libvirt, libvirt-glib, libosinfo,
> osinfo-db-tools, gtk-vnc, spice-gtk all use meson, so should mirror the
> approach above and be quite easy.
>
> Once we can demonstrate the real world impact, we can socialize the idea
> on Fedora devel list more widely and then also approach maintainers
> of other native packages to attempt to convince them to accept mingw
> sub-RPMs into their specs. Every mingw package we can get merged into
> native package frees up a little more time for to spend on the remaining
> mingw packages that are still separate. Ideally we'd get 100% merged
> long term, but even if we get refusals from native maintainers, we'll
> still be better off with those we do succeed in merging.
>
Other packages I added mingw support:
spice-protocol:
https://src.fedoraproject.org/fork/etrunko/rpms/spice-protocol/c/e5df477394b1f6afedf9e221aa25e586f8deb3b8?branch=mingw
https://src.fedoraproject.org/fork/etrunko/rpms/spice-protocol/c/948ab0046cff3e07d3649f146ce5b2d892f62656?branch=mingw
spice-gtk:
https://src.fedoraproject.org/fork/etrunko/rpms/spice-gtk/c/711e56353f6a7c4c1a05d8a4e1ebe96bc57517d4?branch=mingw
I wanted to make sure we can do it for more "complex" packages, such as glib2
as well:
https://src.fedoraproject.org/fork/etrunko/rpms/glib2/c/f5e4e49bbb4ffdc49d96534affcb54fff96717f7?branch=mingw
Regards, Eduardo.
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