On Tuesday 03 January 2012, Eric Noulard wrote: > Sorry sent too soon, finger slipped. > ... > > I have been giving wrong advice about the usage of CMAKE_FIND_ROOT_PATH > which seems to be "reserved" for cross-compiling whereas > > CMAKE_PREFIX_PATH > CMAKE_INCLUDE_PATH > CMAKE_PROGRAM_PATH > CMAKE_LIBRARY_PATH > CMAKE_IGNORE_PATH > > are meant to be used in the general case. > > Could someone enlighten me about the intended usage and > relationship between those vars and their "SYSTEM" counterpart > CMAKE_SYSTEM_*_PATH ?
CMAKE_INCLUDE_PATH is a list of directories used by find_file() and find_path(), could include /home/mystuff/include/ CMAKE_PROGRAM_PATH is a list of directories used by find_program(), could include /home/mystuff/bin/ CMAKE_LIBRARY_PATH is a list of directories used by find_library(), could include /home/mystuff/lib/ These were added 2006 I think. Late 2007 or maybe 2008 came CMAKE_PREFIX_PATH. This make the variables above mostly unnecessary. It is a list of directories, where the respective subdirectory is appended by find_program(), find_file() etc. So for the example above you would be done by setting it to /home/mystuff/ . The directories from these variables are checked before the directories given via PATHS or HINTS. CMAKE_FIND_ROOT_PATH is different (and was added before CMAKE_PREFIX_PATH), it is a list of directories which contain root directories where the filesystem of the target system in a cross-compilation setting is location. You set it e.g. to /opt/eldk/arm/. Then cmake will prepend this root dir to each of the directories it would check otherwise. I.e. find_program() will check in /opt/eldk/arm/bin/, /opt/eldk/arm/usr/bin/, /opt/eldk/arm/usr/local/bin/, /opt/eldk/arm/usr/X11/bin/, etc. I.e. the assumption is that under those prefixes a whole normal filesystem is located. Alex -- 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
