Comment # 7 on bug 1178478 from Petr Gajdos

Why %() are allowed at all then?

From old spec file:

%define apache_mmn      %(test -s %{SOURCE0} && { echo -n apache_mmn_; bzcat
%{SOURCE0} | awk '/^#define MODULE_MAGIC_NUMBER_MAJOR/ {printf "%d", $3}'; } ||
echo apache_mmn_notfound)

[..]

Provides:       %{apache_mmn}

This is there for lot ages. In other words: where %() is allowed and where not?