[CMake] Finding Boost for Windows and Linux.

[Andrew Maclean]

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#-----------------------------------------------------------------------------
# Find the Boost includes and libraries.
# The following variables are set if Boost is found.  If Boost is not
# found, BOOST_FOUND is set to false.
#  BOOST_FOUND         - Set to true when Boost is found.
#  BOOST_INCLUDE_PATH  - the path to where the boost include files are.
#  BOOST_LIBRARY_PATH  - The path to where the boost library files are.
#
# Note:
#  1) If you are just using the boost headers, then you do not need to use
#     BOOST_LIBRARY_PATH in your CMakeLists.txt file.
#  2) If you are using Linux, and the boost libraries are in the default
#  system library paths then you do not need to use BOOST_LIBRARY_PATH.
#
# Usage:
# In your CMakeLists.txt file do something like this:
# ...
# # Boost
# INCLUDE(FindBoost.cmake)
# ...
# INCLUDE_DIRECTORIES (${BOOST_INCLUDE_PATH})
# ...
# #-----------------------------------------------------------------------------
# # Paths to library files.
# IF ( WIN32 )
#  LINK_DIRECTORIES (
#    ${BOOST_LIB_PATH}
#  )
#ELSE ( WIN32 )
# If your boost libraries are not in the system path, add them to a LINK_DIRECTORIES statement here:
#ENDIF ( WIN32 )
#
# Method:
# We are finding a particular boost include file and then assuming that
# the directory structure follows something like this:
# ${BOOST_PATH}/include/boost-x-y-z/boost
# ${BOOST_PATH}/lib
#or:
# ${BOOST_PATH}/include/boost-x-y-z/boost
# ${BOOST_PATH}/lib
# Where ${BOOST_PATH} is defined by ${BOOST_DIR_SEARCH1} below.

# Construct consistent error messages for use below.
SET(BOOST_INCLUDE_PATH_DESCRIPTION "directory containing the boost include files was not found. This could mean that Boost is not installed.")

# Search these directories.
SET(BOOST_DIR_SEARCH1
   /usr;
   /usr/local;
)
IF ( WIN32 )
  # Assume this path exists.
  SET ( BOOST_DIR_SEARCH1
    ${BOOST_DIR_SEARCH1}
    ";C:/boost"
  )
ENDIF ( WIN32 )
STRING(REGEX REPLACE "/;" ";" BOOST_DIR_SEARCH2 "${BOOST_DIR_SEARCH1}")

# Construct a set of paths relative to the system search path.
SET(BOOST_DIR_SEARCH "")
FOREACH(dir ${BOOST_DIR_SEARCH2})
  SET(BOOST_DIR_SEARCH ${BOOST_DIR_SEARCH}
    ${dir}/include/boost-1_33_2/boost
    ${dir}/include/boost-1_33_1/boost
    ${dir}/include/boost-1_33/boost
    ${dir}/include/boost
      )
ENDFOREACH(dir)

#
# Look for an installation or build tree.
#
FIND_PATH(BOOST_INCLUDE_PATH config.hpp

      # Look in places relative to the system executable search path.
      ${BOOST_DIR_SEARCH}

      # Look in standard UNIX install locations.
      /usr/local/include/boost
      /usr/include/boost

      # Help the user find it if we cannot.
      DOC "The ${BOOST_INCLUDE_PATH_DESCRIPTION}"
  )

SET(BOOST_FOUND NOTFOUND)
IF ( BOOST_INCLUDE_PATH )
  # The user may not have installed any libraries.
  SET (BOOST_FOUND "1" )
  GET_FILENAME_COMPONENT(BOOST_LIBRARY_PATH ${BOOST_INCLUDE_PATH} PATH)
  GET_FILENAME_COMPONENT(BOOST_LIBRARY_PATH ${BOOST_LIBRARY_PATH} PATH)
  IF ( EXISTS ${BOOST_LIBRARY_PATH}/lib )
    SET (  BOOST_LIBRARY_PATH ${BOOST_LIBRARY_PATH}/lib CACHE PATH "The path to the Boost library files."  )
  ELSE ( EXISTS ${BOOST_LIBRARY_PATH}/lib )
    GET_FILENAME_COMPONENT(BOOST_LIBRARY_PATH ${BOOST_LIBRARY_PATH} PATH)
    IF ( EXISTS ${BOOST_LIBRARY_PATH}/lib )
      SET ( BOOST_LIBRARY_PATH ${BOOST_LIBRARY_PATH}/lib CACHE PATH "The path to the Boost library files." )
    ELSE ( EXISTS ${BOOST_LIBRARY_PATH}/lib )
      SET (  BOOST_LIBRARY_PATH "" CACHE PATH "The path to the Boost library files."  )
    ENDIF ( EXISTS ${BOOST_LIBRARY_PATH}/lib )
  ENDIF ( EXISTS ${BOOST_LIBRARY_PATH}/lib )
ENDIF ( BOOST_INCLUDE_PATH )

IF ( WIN32 )

  # In windows, automatic linking is performed, so you do not have to specify the libraries.
  # If you are linking to a dynamic runtime, then you can choose to link to either a static or a
  # dynamic Boost library, the default is to do a static link.  You can alter this for a specific
  # library "whatever" by defining BOOST_WHATEVER_DYN_LINK to force Boost library "whatever" to
  # be linked dynamically.  Alternatively you can force all Boost libraries to dynamic link by
  # defining BOOST_ALL_DYN_LINK.

  # This feature can be disabled for Boost library "whatever" by defining BOOST_WHATEVER_NO_LIB,
  # or for all of Boost by defining BOOST_ALL_NO_LIB.

  # If you want to observe which libraries are being linked against then defining
  # BOOST_LIB_DIAGNOSTIC will cause the auto-linking code to emit a #pragma message each time
  # a library is selected for linking.
  ADD_DEFINITIONS(-DBOOST_LIB_DIAGNOSTIC )

ENDIF ( WIN32 )