[cmake-developers] [CMake 0015480]: UseSWIG.cmake warns about CMP0057

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
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http://public.kitware.com/Bug/view.php?id=15480 
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Reported By:                Felix Schwitzer
Assigned To:                
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Project:                    CMake
Issue ID:                   15480
Category:                   CMake
Reproducibility:            have not tried
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             2015-03-27 17:07 EDT
Last Modified:              2015-03-27 17:07 EDT
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Summary:                    UseSWIG.cmake warns about CMP0057
Description: 
When calling swig_add_module (from module UseSWIG) with the same interface file
for different scripting languages, cmake emits a warning about CMP0057 as
swig_add_module adds the interface file as MAIN_DEPENDENCY to the generated
wrapper file.
This happens with an actual cmake from master (7910cb7);
see http://article.gmane.org/gmane.comp.programming.tools.cmake.devel/12835

I added a minimal example to reproduce and a patch

Steps to Reproduce: 
unpack the attached example tst.tgz and change into the directory tst, then
    mkdir build && cd build && cmake ..

Without patching cmake fails as CMP0057 is set to new. With the patch the
command runs fine.

On a system with swig, ruby-dev and python-dev installed, compilation should run
fine and also the dependencies are kept right:
    make
-> runs swig and compiles the wrappers
    touch ../ltt.i && make
-> runs swig again and compiles the wrappers
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Issue History 
Date Modified    Username       Field                    Change               
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2015-03-27 17:07 Felix SchwitzerNew Issue                                    
2015-03-27 17:07 Felix SchwitzerFile Added: tst.tgz                          
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