Note which rule has a modification effect.

It is unused.

Summary: Cut-and-paste-o from the Python detection code.

Reviewers: #frameworks, skelly, apol

Reviewed By: apol

Subscribers: #buildsystem

Tags: #frameworks, #buildsystem

Differential Revision: https://phabricator.kde.org/D3952

This can be used by KF5 libraries to generate python 2 and 3 bindings.

When sip is executed it is passed one .sip file.  However, it uses that
to generate multiple cpp source files, one per class in the sip file.

Buildsystems need to know the outputs of commands, so this does not work
well as the output can't easily be predicted.

So, create a unity build of all files to compile into the python module.

The ruleset is used to transform or omit artifacts in C++ header files
when determining the SIP content to generate.  Some content common to
all Qt-using libraries can be processed by using the rule set present
here.  For example, most Q_METATYPE internal declarations should be
discarded.

These files process C++ headers with libclang and python-clang bindings,
using the AST to generate SIP files for PyQt binding library generation.

The design allows for further extensions which can process other
artifacts found in headers.  This iteration of the design is a simple
minimum which suffices to generate headers for KItemModels and some
other libraries.