The documentation says list(APPEND <list> <element> [<element> ...])
That should be changed to list(APPEND <list> [<element> ...]) The first form of documentation implies at least one element is mandatory, but this test case shows otherwise. software@raven> cat test.cmake set(LIB_INSTALL_RPATH a b c) message(STATUS "LIB_INSTALL_RPATH = ${LIB_INSTALL_RPATH}") list(APPEND LIB_INSTALL_RPATH ${TCL_TK_ITCL_ITK_RPATH}) message(STATUS "LIB_INSTALL_RPATH = ${LIB_INSTALL_RPATH}") The result of "cmake -P test.cmake" is -- LIB_INSTALL_RPATH = a;b;c -- LIB_INSTALL_RPATH = a;b;c i.e., no error because TCL_TK_ITCL_ITK_RPATH (in my actual use case, a list of RPATH directories with the system locations removed) is empty. (An even simpler test case with ${TCL_TK_ITCL_ITK_RPATH} removed altogether gives the same result as well although there is no practical use for that.) This behaviour of list(APPEND ...) is desireable, of course, because it means you don't have to check for an empty variable when appending it to a list, and the unchanged result from such an append seems reasonable as well (rather than adding an empty element on the end). But please fix the documentation which implies you do have to make such a check for an empty variable. Alan __________________________ Alan W. Irwin Astronomical research affiliation with Department of Physics and Astronomy, University of Victoria (astrowww.phys.uvic.ca). Programming affiliations with the FreeEOS equation-of-state implementation for stellar interiors (freeeos.sf.net); the Time Ephemerides project (timeephem.sf.net); PLplot scientific plotting software package (plplot.sf.net); the libLASi project (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project (lbproject.sf.net). __________________________ Linux-powered Science __________________________ -- Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Follow this link to subscribe/unsubscribe: http://public.kitware.com/cgi-bin/mailman/listinfo/cmake-developers