[Fedora-packaging] arched BuildRequires?

[Toshio Kuratomi]

On Thu, Jun 13, 2013 at 08:30:19PM +0200, Michael Schwendt wrote:
> On Thu, 13 Jun 2013 19:09:29 +0200, Mattias Ellert wrote:
> 
> > If what you say above was true it would be a problem. But it doesn't
> > work like that.
> 
> True, it doesn't really work like that, but %_isa in BuildRequires
> adds a confusing problem nevertheless.
> 
> BuildRequires in the spec file become the src.rpm's Requires.
> If those Requires are arch-specific, you cannot use tools like
> yum-builddep or "rpm" to query the package's build requirements.
> You would need to reconstruct the src.rpm always for the target
> arch (not only if there are arch-conditional BuildRequires).
> 
> The src.rpm is built on an arbitrary build host, and Fedora publishes
> a single src.rpm build in the sources repo. It's just lame if the user
> of an x86_64 installation downloads src.rpm packages, which contain
> x86-32, ppc or other arch-specific dependencies. That doesn't add any
> value at all.
> 
> > $ rpmbuild --rebuild globus-common-14.9-3.fc18.src.rpm
> 
> That doesn't evaluate the src.rpm's Requires as yum-builddep or "rpm -qpR" do.
> So, why obfuscate the BuildRequires and the src.rpm's Requires?
>  
> > ... build succeeds ... because the BRs needed on the build system's architecture are there
> > 
> 
> Nasty, isn't it? The package specifies '(x86-32)' requirements, but you've
> just built for '(x86-64)'.

The FPC discussed this today and added a prohibition to using %{_isa} in
BuildRequires to the Guidelines:

https://fedoraproject.org/wiki/Packaging:Guidelines#BuildRequires_and_.25.7B_isa.7D

Thanks to mschwendt for explaining the rationale so clearly.

-Toshio
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