On Mon, Nov 14, 2016 at 2:15 PM, Richard W.M. Jones <rjones@xxxxxxxxxx> wrote:
> Here are three packages, none of them using %{?_isa} in their spec files:
>
> (a) libvirt http://pkgs.fedoraproject.org/cgit/rpms/libvirt.git/tree/libvirt.spec
> (b) libguestfs http://pkgs.fedoraproject.org/cgit/rpms/libguestfs.git/tree/libguestfs.spec
> (c) qemu http://pkgs.fedoraproject.org/cgit/rpms/qemu.git/tree/qemu.spec
>
> They all have a "core" package, and subpackages which Require this
> core package, for example:
>
> %package system-x86 # subpackage of qemu
> Summary: QEMU system emulator for x86
> Group: Development/Tools
> Requires: %{name}-common = %{epoch}:%{version}-%{release}
> ...
>
> %package client # subpackage of libvirt
> Summary: Client side utilities of the libvirt library
> Group: Development/Libraries
> Requires: %{name}-libs = %{version}-%{release}
> ...
>
> The question has been asked, do any of these need to be modified to
> use the _isa macro, eg:
>
> Requires: %{name}-libs%{?_isa} = %{version}-%{release}
>
> I believe the answer is:
>
> (1) YES for the two libraries (a) and (b)
> (2) NO for qemu (c) because it's a program not a library
That is correct.
> However I'm not sure I can clearly express why this is true. AFAIK it
> has never caused any problems not using %{?_isa}.
More an issue when multilib comes into play so possibly not an issue
for libvirt.
> But wait! There's more ...
>
> We're about to modularize parts of the qemu binary into plugins, one
> for each block driver.
> (https://bugzilla.redhat.com/show_bug.cgi?id=1393688) The aim of this
> is to reduce the dependencies of qemu.
YAY! \o/
> The qemu plugins are shared libraries, eg. %{_libdir}/qemu/block-iscsi.so
> and (eg) the x86_64 plugin cannot be plugged into an i686 qemu binary
> or vice versa.
>
> Is this a case where we should use %{?_isa} in qemu.spec?
Hmm, not sure on this, my guess is probably because you'd never want
i686 to be installed for x86_64/
P
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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