[CMake] proper setup to create file and have it installed

[edA-qa mort-ora-y]

I'm using lupdate/lrelease in QT and trying to have a generated file
installed. I've hit a few problems that I'm not clear on how they should
be resolved.

To produce the file I have a chain of commands that ends with:

add_custom_command(
	OUTPUT English.qm
	COMMAND lrelease ${LANG_DIR}/MasterTypes.ts -qm English.qm
	DEPENDS ${LANG_DIR}/MasterTypes.ts
	)

To directly produce this file I add the following target:

add_custom_target( language
	DEPENDS English.qm )

Now "make language" produces the file(s) as I want. I now however need
to install them.  install files won't take a relative path so I've
specified the following:

install( FILES ${CMAKE_BINARY_DIR}/src/gui/English.qm DESTINATION data/ )

I thought there might be some way to refer to the relative "English.qm"
file. Is there?

That aside, I need that the install command checks the dependencies on
the file. As specified it does not, and I don't see a DEPENDS clause for
install.  How do I ensure that the installation updates the file as
required?

-- 
edA-qa mort-ora-y
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