CMake/Modules/CMakeSystemSpecificInformation.cmake

# this module sets system information like how to build libraries
# before including this file the system, C, and C++ compilers must
# have already been determined.
# This file first sets default variables that can be used for most
# makefiles.  Next, it will include a system specific file.  Finally,
# it will optionally include a system and compiler specific file that
# can be used to override any of this information.
# For debugging new systems, and expert users, if the
# CMAKE_USER_MAKE_RULES_OVERRIDE is set to a file name, that
# file will be included last, and can override any variable


# 1. set default values that will work for most system

# suffix that needs to be added onto a library to link it .lib on windows
# not used on most unix systems
SET(CMAKE_LINK_LIBRARY_SUFFIX "")  

SET(CMAKE_STATIC_LIBRARY_PREFIX "lib")
SET(CMAKE_STATIC_LIBRARY_SUFFIX ".a")
SET(CMAKE_SHARED_LIBRARY_PREFIX "lib")          # lib
SET(CMAKE_SHARED_LIBRARY_SUFFIX ".so")          # .so
SET(CMAKE_DL_LIBS "-ldl")
SET(CMAKE_SHARED_LIBRARY_C_FLAGS "")            # -pic 
SET(CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-shared")       # -shared
SET(CMAKE_SHARED_LIBRARY_LINK_FLAGS "")         # +s, flag for exe link to use shared lib
SET(CMAKE_SHARED_LIBRARY_RUNTIME_FLAG "")       # -rpath
SET(CMAKE_SHARED_LIBRARY_RUNTIME_FLAG_SEP "")   # : or empty
SET(CMAKE_LIBRARY_PATH_FLAG "-L")
SET(CMAKE_LINK_LIBRARY_FLAG "-l")
IF(CMAKE_COMPILER_IS_GNUCXX)
  SET(CMAKE_SHARED_LIBRARY_C_FLAGS "-fPIC")     # -pic 
  SET(CMAKE_SHARED_LIBRARY_CXX_FLAGS "-fPIC")   # -pic
ENDIF(CMAKE_COMPILER_IS_GNUCXX)


SET (CMAKE_SKIP_RPATH "NO" CACHE BOOL
     "If set, runtime paths are not added when using shared libraries.")
MARK_AS_ADVANCED(CMAKE_SKIP_RPATH)
# 2. now include SystemName.cmake file to set the system specific information
SET(CMAKE_SYSTEM_INFO_FILE ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}.cmake)
IF(EXISTS ${CMAKE_SYSTEM_INFO_FILE})
  INCLUDE(${CMAKE_SYSTEM_INFO_FILE})
ELSE(EXISTS ${CMAKE_SYSTEM_INFO_FILE})
  MESSAGE("System is unknown to cmake, create:\n${CMAKE_SYSTEM_INFO_FILE}"
          " to use this system, please send your config file to "
          "cmake@www.cmake.org so it can be added to cmake"")
ENDIF(EXISTS ${CMAKE_SYSTEM_INFO_FILE})

# 3. include optional systemname-compiler.cmake files
IF(CMAKE_C_COMPILER)
  GET_FILENAME_COMPONENT(CMAKE_BASE_NAME ${CMAKE_C_COMPILER} NAME_WE)
  # since the gnu compiler has several names force gcc
  IF(CMAKE_COMPILER_IS_GNUGCC)
     SET(CMAKE_BASE_NAME gcc)
  ENDIF(CMAKE_COMPILER_IS_GNUGCC)
  SET(CMAKE_SYSTEM_AND_C_COMPILER_INFO_FILE 
      ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}.cmake)
  INCLUDE(${CMAKE_SYSTEM_AND_C_COMPILER_INFO_FILE} OPTIONAL)
ENDIF(CMAKE_C_COMPILER)
IF(CMAKE_CXX_COMPILER)
  GET_FILENAME_COMPONENT(CMAKE_BASE_NAME ${CMAKE_CXX_COMPILER} NAME_WE)
  # since the gnu compiler has several names force gcc
  IF(CMAKE_COMPILER_IS_GNUCXX)
     SET(CMAKE_BASE_NAME g++)
  ENDIF(CMAKE_COMPILER_IS_GNUCXX)
  SET(CMAKE_SYSTEM_AND_CXX_COMPILER_INFO_FILE
      ${CMAKE_ROOT}/Modules/Platform/${CMAKE_SYSTEM_NAME}-${CMAKE_BASE_NAME}.cmake)
  INCLUDE(${CMAKE_SYSTEM_AND_CXX_COMPILER_INFO_FILE} OPTIONAL)
ENDIF(CMAKE_CXX_COMPILER)


# for most systems a module is the same as a shared library
# so unless the variable CMAKE_MODULE_EXISTS is set just
# copy the values from the LIBRARY variables
IF(NOT CMAKE_MODULE_EXISTS)
  SET(CMAKE_SHARED_MODULE_C_FLAGS ${CMAKE_SHARED_LIBRARY_C_FLAGS)
  SET(CMAKE_SHARED_MODULE_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_CXX_FLAGS})
  SET(CMAKE_SHARED_MODULE_CREATE_C_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS})
  SET(CMAKE_SHARED_MODULE_PREFIX ${CMAKE_SHARED_LIBRARY_PREFIX})
  SET(CMAKE_SHARED_MODULE_SUFFIX ${CMAKE_SHARED_LIBRARY_SUFFIX})
  SET(CMAKE_SHARED_MODULE_LINK_FLAGS ${CMAKE_SHARED_LIBRARY_LINK_FLAGS})
  SET(CMAKE_SHARED_MODULE_RUNTIME_FLAG ${CMAKE_SHARED_LIBRARY_RUNTIME_FLAG})
  SET(CMAKE_SHARED_MODULE_RUNTIME_FLAG_SEP ${CMAKE_SHARED_MODULE_RUNTIME_FLAG_SEP})
ENDIF(NOT CMAKE_MODULE_EXISTS)


IF(NOT CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS)
  SET(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS})
ENDIF(NOT CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS)

IF(NOT CMAKE_SHARED_LIBRARY_CXX_FLAGS)
  SET(CMAKE_SHARED_LIBRARY_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_C_FLAGS})
ENDIF(NOT CMAKE_SHARED_LIBRARY_CXX_FLAGS)

IF(NOT CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS)
  SET(CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS ${CMAKE_SHARED_LIBRARY_LINK_FLAGS})
ENDIF(NOT CMAKE_SHARED_LIBRARY_LINK_CXX_FLAGS)

IF(NOT CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG)
  SET(CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG ${CMAKE_SHARED_LIBRARY_RUNTIME_FLAG}) 
ENDIF(NOT CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG)

IF(NOT CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP)
  SET(CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP ${CMAKE_SHARED_LIBRARY_RUNTIME_FLAG_SEP})
ENDIF(NOT CMAKE_SHARED_LIBRARY_RUNTIME_CXX_FLAG_SEP)


# include default rules that work for most unix like systems and compilers
# this file will not set anything if it is already set
INCLUDE(${CMAKE_ROOT}/Modules/CMakeDefaultMakeRuleVariables.cmake)

IF(CMAKE_USER_MAKE_RULES_OVERRIDE)
   INCLUDE(${CMAKE_USER_MAKE_RULES_OVERRIDE})
ENDIF(CMAKE_USER_MAKE_RULES_OVERRIDE)

FIND_PROGRAM(CMAKE_MAKE_PROGRAM NAMES nmake gmake make )

SET(CMAKE_VERBOSE_MAKEFILE FALSE CACHE BOOL "If this value is on, makefiles will be generated without the .SILENT directive, and all commands will be echoed to the console during the make.  This is useful for debugging only.")
# default build type is none
SET (CMAKE_BUILD_TYPE "" CACHE STRING 
     "Choose the type of build, options are: None(CMAKE_CXX_FLAGS or CMAKE_C_FLAGS used) Debug Release RelWithDebInfo MinSizeRel.")

# Add these settings to the cache.
SET (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" CACHE STRING
     "Flags used by the compiler during all build types.")
SET (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}" CACHE STRING
     "Flags used by the compiler during debug builds.")
SET (CMAKE_CXX_FLAGS_MINSIZEREL "${CMAKE_CXX_FLAGS_MINSIZEREL}" CACHE STRING
     "Flags used by the compiler during release minsize builds.")
SET (CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE}" CACHE STRING
     "Flags used by the compiler during release builds (/MD /Ob1 /Oi /Ot /Oy /Gs will produce slightly less optimized but smaller files).")
SET (CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO}" CACHE STRING
     "Flags used by the compiler during Release with Debug Info builds.")
SET (CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING
     "Flags for C compiler.")

MARK_AS_ADVANCED(
CMAKE_VERBOSE_MAKEFILE 
CMAKE_CXX_FLAGS
CMAKE_CXX_FLAGS_RELEASE
CMAKE_CXX_FLAGS_RELWITHDEBINFO
CMAKE_CXX_FLAGS_MINSIZEREL
CMAKE_CXX_FLAGS_DEBUG
CMAKE_C_FLAGS
)