using a macro in ExclusiveArch

[Björn Persson]

I need some advice on how to fix this build failure. The GtkAda package builds 
fine in Mock, but fails in Koji with the error "No matching arches were found":

http://koji.fedoraproject.org/koji/taskinfo?taskID=3621310

Several Ada packages need an ExclusiveArch directive to prevent attempts to 
build them on secondary architectures where GNAT isn't available. I thought it 
would be a good idea to keep the list of architectures in a macro to get 
closer to a single point of truth. I defined the macro in /etc/rpm/macros.gnat 
in the package fedora-gnat-project-common:

%GNAT_arches %{ix86} x86_64 ia64 ppc ppc64 alpha

GtkAda uses the macro like this:

BuildRequires: fedora-gnat-project-common >= 3.3
ExclusiveArch: %{GNAT_arches}

I *think* the reason why the build fails in Koji might be that Koji reads the 
ExclusiveArch directive to figure out which build server should handle the 
build, and it doesn't pull in buildrequired packages before doing that, so 
GNAT_arches is undefined. Does this analysis seem correct?

If so, what should I do about it? Should macros simply not be used in the 
ExclusiveArch directive? I see ghc_arches, mono_arches and ocaml_arches in 
other files in /etc/rpm. Those files all belong to redhat-rpm-config. Would this 
work if GNAT_arches were defined in redhat-rpm-config instead of fedora-gnat-
project-common? Is it significant that all three filenames end in "-srpm"? Or 
should this be considered a bug in Koji?

Björn Persson
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