[CMake] Questions on CMAKE_CONFIGURATION_TYPES

[Ryan Pavlik]

On 3/26/10 5:22 AM, Michael Schildt wrote:
>
>> You don't generally need to use link-directories - if you're using
>> imported targets from a *Config.cmake file, the build type choice I
>> would imagine is automatic (?), 
> Yes, that is that the former guys wrote and it is really working this 
> easy way now.
>
>> and if not you should be passing full
>> paths to the library files in target_link_libraries, where you can
>> specify using the debug, optimized, and general keywords.
> For external lib not using cmake i will use something like
>
> /TARGET_LINK_LIBRARIES( Project1     debug 
> //F:/Extern////Lib1/Debug/test1.lib//
> /    optimized //F:/Extern//Lib1/Release/test1.lib
>     )
> /
>
> But i have not tested yet. i suggest to add this to the FAQ because i 
> missed it there very much.
>
> Ciao,
>    Michael
Instead of hard-coding the paths in your CMakeLists.txt, I'd suggest 
using the find_library and find_path (for include_directories) to 
attempt to find the libraries in some area, and to allow the developer 
to change the library/include paths by editing a cache variable with the 
CMake GUI.  At least to me, I code my CMakeLists files for all projects 
as if the project were open source and might be built by folks who had 
just installed the dependencies either a: in their default locations 
(where I want to auto-detect them), or b: in some strange location (if 
they configured a different install location, I want them to be able to 
configure the build of the project similarly.)  As a result, I create 
Find*.cmake modules for every dependency that provide a 
WHATEVER_ROOT_DIR cache variable, used to generate appropriate paths to 
pass as "HINTS" to the find_library/path calls, that is not marked as 
advanced until the full library is found, as well as the individual 
_LIBRARY and _INCLUDE_DIR cache vars that are marked as advanced 
automatically in all cases.  I've pasted an example below.

Ryan

---- FindVRPN.cmake ----

# - try to find VRPN library
#
# Cache Variables:
#  VRPN_LIBRARY
#  VRPN_SERVER_LIBRARY
#  VRPN_INCLUDE_DIR
#
# Non-cache variables you might use in your CMakeLists.txt:
#  VRPN_FOUND
#  VRPN_SERVER_LIBRARIES
#  VRPN_LIBRARIES
#  VRPN_INCLUDE_DIRS
#
# VRPN_ROOT_DIR is searched preferentially for these files
#
# Requires these CMake modules:
#  FindPackageHandleStandardArgs (known included with CMake >=2.6.2)
#
# Original Author:
# 2009-2010 Ryan Pavlik <rpavlik at iastate.edu> <abiryan at ryand.net>
# http://academic.cleardefinition.com
# Iowa State University HCI Graduate Program/VRAC

set(VRPN_ROOT_DIR
     "${VRPN_ROOT_DIR}"
     CACHE
     PATH
     "Root directory to search for VRPN")

if("${CMAKE_SIZEOF_VOID_P}" MATCHES "8")
     set(_libsuffixes lib64 lib)
else()
     set(_libsuffixes lib)
endif()

###
# Configure VRPN
###

find_path(VRPN_INCLUDE_DIR
     NAMES
     vrpn_Connection.h
     PATH_SUFFIXES
     include
     include/vrpn
     HINTS
     "${VRPN_ROOT_DIR}")

find_library(VRPN_LIBRARY
     NAMES
     vrpn
     PATH_SUFFIXES
     ${_libsuffixes}
     HINTS
     "${VRPN_ROOT_DIR}")

find_library(VRPN_SERVER_LIBRARY
     NAMES
     vrpnserver
     PATH_SUFFIXES
     ${_libsuffixes}
     HINTS
     "${VRPN_ROOT_DIR}")

###
# Dependencies
###
set(_deps_libs)
set(_deps_includes)
set(_deps_check)

find_package(quatlib)
list(APPEND _deps_libs ${QUATLIB_LIBRARIES})
list(APPEND _deps_includes ${QUATLIB_INCLUDE_DIRS})
list(APPEND _deps_check QUATLIB_FOUND)

if(NOT WIN32)
     find_package(Threads)
     list(APPEND _deps_libs ${CMAKE_THREAD_LIBS_INIT})
     list(APPEND _deps_check CMAKE_HAVE_THREADS_LIBRARY)
endif()


# handle the QUIETLY and REQUIRED arguments and set xxx_FOUND to TRUE if
# all listed variables are TRUE
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(VRPN
     DEFAULT_MSG
     VRPN_LIBRARY
     VRPN_INCLUDE_DIR
     ${_deps_check})

if(VRPN_FOUND)
     set(VRPN_INCLUDE_DIRS "${VRPN_INCLUDE_DIR}" ${_deps_includes})
     set(VRPN_LIBRARIES "${VRPN_LIBRARY}" ${_deps_libs})
     set(VRPN_SERVER_LIBRARIES "${VRPN_SERVER_LIBRARY}" ${_deps_libs})

     mark_as_advanced(VRPN_ROOT_DIR)
endif()

mark_as_advanced(VRPN_LIBRARY
     VRPN_SERVER_LIBRARY
     VRPN_INCLUDE_DIR)

-- 
Ryan Pavlik
Human-Computer Interaction Graduate Student
Virtual Reality Applications Center
Iowa State University

rpavlik at iastate.edu
http://academic.cleardefinition.com/