[CMake] Swig and cmake

[Ian.Appru at ubs.com]

Hi 

Thought you might find useful the results of some work I've done with
swig and cmake.

I mailed previously regarding spliting the swig java file generation
step and interface cxx compile step.
This was so that I could compile the java/dotnet files before the cxx
generated files - important to my project since the cxx compile take
quite a while but errors normally appeared in the subsequently compiled
java/dotnet files.

The soln I came up with was to use a dummy file as a dependency of
SWIG_ADD_MODULE and a custom cmd which generated this file and compiled
the java files.

Never really happy with that - as obviously a bit cludgey.

The much simpler solution was to add an extra helper target into Cmakes
SWIG_ADD_MODULE macro 

	ADD_CUSTOM_TARGET(swig
		"@echo" Run the swig build for
${SWIG_MODULE_${name}_SWIG_LANGUAGE_FLAG}
		DEPENDS ${swig_generated_sources}
    ${swig_other_sources}
		)

I can therefore call each step in any order I like and also use gmake
parallel compile for swig and not cxx if I wish - (the MS compiler very
averse to parallel compiles)

	make swig -j$(MAKEJOBS)
	make compile-java
	make my-JNI -j(CXX_MAKEJOBS)

Regards
Ian


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