[CMake] depend.make

[Nils Gladitz]

On 13.12.2013 10:43, Lars wrote:
> Using the include_regular_expression macro made a huge difference. The 
> build time was reduced by more than 50%.
>
> The regular expression appear to be only applied to part of 
> the dependency file path. So in the case of Boost this 
> works pretty well for us because we use #include 
> <boost/filesystem.hpp> but more difficult to remove qt 
> dependency like #include <QDir>. How do you view adding a feature 
> that allow applying regex to the absolute path? Secondly, the 
> documentation of include_regular_expression should probably 
> mention something about the target string (relative path, not absolute).
Maybe CMake could filter out includes in system directories (like gcc 
-MM does).
System directories in this case could be directories added with e.g. 
include_directories(SYSTEM).

Nils
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