On Aug 27, 2007, at 2:26 PM, Jos Vos wrote:
Hi,
Where can I find documentation about how %{expand:...} exactly is
defined and when it is useful?
The macro primitive %{expand:...} is like eval in shell.
All it does is continue a macro expansion from the beginning, not
the end, of whatever was justr expanded.
So if, say, you wanted to define
%define foo bing
%define %{foo} bang
to have the result be
%bing bang
then this construct accomplishes
%{expand:%%define %{foo} bang}
The 1st pass substitutes "bing" for %{foo}, the second pass
accomplishes the define.
When browsing through spec files, I have the impression that it is
unnecessarily used in a lot of cases.
Likely.
73 de Jeff
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