[peroyvind@dvalin ~]$ rpm --eval '%trace%{expand:%%global mkrel() %testrel}%trace'
feil: Macro % has illegal name (%define)
  1>   %{expand:%%global mkrel() %testrel}^trace
  2>     %testrel^
  3>       %{?mkrel}^{!?mkrel:%1}
  4>         %{-c: 0.%{-c*}.}^{1}%{?subrel:.%subrel}%{?distsuffix:%...
  4>         %{1}^{?subrel:.%subrel}%{?distsuffix:%distsuffix}%{?!d...
  4>         %{?subrel:.%subrel}^{?distsuffix:%distsuffix}%{?!dists...
  4>         %{?distsuffix:%distsuffix}^{?!distsuffix:mdv}%{?mandri...
  5>           %distsuffix^
  5<           mdv
  4<         mdv
  4>         %{?!distsuffix:mdv}^{?mandriva_release:%mandriva_relea...
  4>         %{?mandriva_release:%mandriva_release}^
  5>           %mandriva_release^
  5<           2007.1
  4<         2007.1
  3<       2007.1
  3>       %{!?mkrel:%1}^
  2<     (empty)
  1<   %{1}mdv2007.1
  2>     %global^mkrel() %{1}mdv2007.1
  3>       %{1}^dv2007.1
  2<     %{1}mdv2007.1
  1<   (empty)
  1>   %trace^
  0< (empty)

  1>   %{?_transaction_color}^
  1<   0
  0< 0