[CMake] custom_install-target with DESTDIR

[M G Berberich]

Hello,

I want to have a target ‘installdoxy’ that essentially does

  INSTALL(DIRECTORY html/ 
    DESTINATION /share/doc/${PROJECT_NAME})

when I call ‘make DESTDIR=… installdoxy’. The above code, of course,
does not work, because it installs during ‘make install’

Defining a custom target via

  ADD_CUSTOM_TARGET(installdoxy
    COMMAND ${CMAKE_COMMAND} -E copy_directory html 
    ${CMAKE_INSTALL_PREFIX}/share/doc/${PROJECT_NAME} VERBATIM )

does not work either because the DESTDIR=…-magic seems to only work in
‘make DESTDIR=… install’ not in ‘make DESTDIR=… installdoxy’. Using

  $ENV{DESTDIR}/${CMAKE_INSTALL_PREFIX}/share/doc/${PROJECT_NAME}

does not work either, because ‘$ENV{DESTDIR}’ is expanded while cmake
runs, not while make does.

So, any chance to define a custom install target that is usable with
DESTDIR?

	MfG
	bmg

-- 
„Des is völlig wurscht, was heut beschlos- | M G Berberich
 sen wird: I bin sowieso dagegn!“          | berberic at fmi.uni-passau.de
(SPD-Stadtrat Kurt Schindler; Regensburg)  | www.fmi.uni-passau.de/~berberic