[u/mrichter/AliRoot.git] / STARLIGHT / starlight / cmake_modules / FindROOT.cmake

###########################################################################
#
#    Copyright 2010
#
#    This file is part of Starlight.
#
#    Starlight is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#	  
#    Starlight is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#    GNU General Public License for more details.
#	  
#    You should have received a copy of the GNU General Public License
#    along with Starlight. If not, see <http://www.gnu.org/licenses/>.
#
###########################################################################
#
# File and Version Information:
# $Rev:: 28                          $: revision of last commit
# $Author:: bgrube                   $: author of last commit
# $Date:: 2010-12-10 19:30:01 +0100 #$: date of last commit
#
# Description:
#     cmake module for finding ROOT installation
#     requires root-config to be in PATH
#     based on AliRoots's FindROOT.cmake (r41015)
#     in https://alisoft.cern.ch/AliRoot/trunk/cmake/modules
#
#     following variables are defined:
#     ROOT_CONFIG_EXECUTABLE - path to root-config program
#     ROOTSYS                - path to root installation directory
#     ROOT_TARGET            - target architecture
#     ROOT_F77               - Fortran complier used building ROOT
#     ROOT_CC                - C complier used building ROOT
#     ROOT_CPP               - C++ complier used building ROOT
#     ROOT_VERSION           - ROOT version
#     ROOT_SVN_REVISION      - ROOT subversion revision
#     ROOT_BIN_DIR           - ROOT executable directory
#     ROOT_INCLUDE_DIR       - ROOT header directory
#     ROOT_LIBRARY_DIR       - ROOT library directory
#     ROOT_LIBRARIES         - linker flags for ROOT libraries
#     ROOT_AUX_LIBRARIES     - linker flags for auxiliary libraries
#     ROOTCINT_EXECUTABLE    - path to rootcint program
#     ROOT_MAJOR_VERSION     - ROOT major version
#     ROOT_MINOR_VERSION     - ROOT minor version
#     ROOT_PATCH_VERSION     - ROOT patch level
#     ROOT_LIBS              - list of ROOT library files
#
#     Example usage:
#         find_package(ROOT 5.26 REQUIRED Minuit2)
#
#
#     The module also provides a function to generate ROOT dictionaries.
#     Example usage:
#         set(ROOTPWA_DICTIONARY ${CMAKE_CURRENT_BINARY_DIR}/someDict.cc)  # set dictionary path
#         root_generate_dictionary(
#           "${ROOTPWA_DICTIONARY}"            # path to dictionary to generate
#           "${INCLUDE_DIR1};${INCLUDE_DIR2}"  # list of includes
#           "class1.h;class2.h;class3.h"       # list of classes to process
#           "someLinkDef.h"                    # ROOT linkDef file
#         )
#         set(SOURCES ${SOURCES} ${ROOTPWA_DICTIONARY})  # append dictionary to sources
#
#
###########################################################################


set(ROOT_FOUND        FALSE)
set(ROOT_ERROR_REASON "")
set(ROOT_DEFINITIONS  "")
set(ROOT_LIBS)


find_program(ROOT_CONFIG_EXECUTABLE root-config)
if(NOT ROOT_CONFIG_EXECUTABLE)
  set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} Cannot find root-config.")
else()
  
  set(ROOT_FOUND TRUE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --prefix 
    OUTPUT_VARIABLE ROOTSYS 
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --arch
    OUTPUT_VARIABLE ROOT_TARGET
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --f77 
    OUTPUT_VARIABLE ROOT_F77 
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --cc
    OUTPUT_VARIABLE ROOT_CC 
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --cxx
    OUTPUT_VARIABLE ROOT_CPP
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --version
    OUTPUT_VARIABLE ROOT_VERSION
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --svn-revision
    OUTPUT_VARIABLE ROOT_SVN_REVISION
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --bindir
    OUTPUT_VARIABLE ROOT_BIN_DIR
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  if(NOT EXISTS "${ROOT_BIN_DIR}")
    set(ROOT_FOUND FALSE)
    set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT executable directory ${ROOT_BIN_DIR} does not exist.")
  endif()

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --incdir
    OUTPUT_VARIABLE ROOT_INCLUDE_DIR
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  if(NOT EXISTS "${ROOT_INCLUDE_DIR}")
    set(ROOT_FOUND FALSE)
    set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT include directory ${ROOT_INCLUDE_DIR} does not exist.")
  endif()

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --libdir
    OUTPUT_VARIABLE ROOT_LIBRARY_DIR
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  if(NOT EXISTS "${ROOT_LIBRARY_DIR}")
    set(ROOT_FOUND FALSE)
    set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT library directory ${ROOT_LIBRARY_DIR} does not exist.")
  endif()

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --noauxlibs --glibs
    OUTPUT_VARIABLE ROOT_LIBRARIES
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  execute_process(
    COMMAND ${ROOT_CONFIG_EXECUTABLE} --auxlibs
    OUTPUT_VARIABLE ROOT_AUX_LIBRARIES
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  find_program(ROOTCINT_EXECUTABLE rootcint)
  if(NOT ROOTCINT_EXECUTABLE)
    set(ROOT_FOUND FALSE)
    set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} Cannot find rootcint.")
  endif()

  # parse version string
  string(REGEX REPLACE "^([0-9]+)\\.[0-9][0-9]+\\/[0-9][0-9]+.*" "\\1"
    ROOT_MAJOR_VERSION "${ROOT_VERSION}")
  string(REGEX REPLACE "^[0-9]+\\.([0-9][0-9])+\\/[0-9][0-9]+.*" "\\1"
    ROOT_MINOR_VERSION "${ROOT_VERSION}")
  string(REGEX REPLACE "^[0-9]+\\.[0-9][0-9]+\\/([0-9][0-9]+).*" "\\1"
    ROOT_PATCH_VERSION "${ROOT_VERSION}")
  # make sure minor version is specified
  if(ROOT_FIND_VERSION AND NOT ROOT_FIND_VERSION_MINOR)
    message(FATAL_ERROR "When requesting a specific version of ROOT, you must provide at least the major and minor version numbers, e.g., 5.22")
  endif()
  # set patchlevel to 0, if not specified
  if(NOT ROOT_FIND_VERSION_PATCH)
    set(ROOT_FIND_VERSION_PATCH 0)
  endif()
  # compute an overall version number which can be compared at once
  math(EXPR _ROOT_FIND_VERSION "${ROOT_FIND_VERSION_MAJOR} * 10000 + ${ROOT_FIND_VERSION_MINOR} * 100 + ${ROOT_FIND_VERSION_PATCH}")
  math(EXPR _ROOT_VERSION "${ROOT_MAJOR_VERSION} * 10000 + ${ROOT_MINOR_VERSION} * 100 + ${ROOT_PATCH_VERSION}")
  # compare version
  if(ROOT_FIND_VERSION_EXACT)
    if(NOT _ROOT_VERSION EQUAL "${_ROOT_FIND_VERSION}")
      set(ROOT_FOUND FALSE)
      set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT version ${ROOT_VERSION} does not match requested version ${ROOT_FIND_VERSION_MAJOR}.${ROOT_FIND_VERSION_MINOR}/${ROOT_FIND_VERSION_PATCH}.")
    endif()
  else()
    if(_ROOT_VERSION LESS "${_ROOT_FIND_VERSION}")
      set(ROOT_FOUND FALSE)
      set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT version ${ROOT_VERSION} is lower than requested version ${ROOT_FIND_VERSION_MAJOR}.${ROOT_FIND_VERSION_MINOR}/${ROOT_FIND_VERSION_PATCH}.")
    endif()
  endif()

endif()


# generate list of ROOT libraries
if(ROOT_FOUND)

  # create list of internal libraries from root-config output
  set(_LIBRARY_NAMES)
  set(_EXTERNAL_ZLIB)
  separate_arguments(ROOT_LIBRARIES)
  # remove first -L entry
  list(REMOVE_AT ROOT_LIBRARIES 0)
  # loop over -l entries
  foreach(_LIBRARY ${ROOT_LIBRARIES})
    # extract library name from compiler flag and append to list
    string(REGEX REPLACE "^-.(.*)$" "\\1" _LIBNAME "${_LIBRARY}")
    # workaround for root-config inconsistency: if ROOT is built with --disable-builtin-zlib
    # root-config returns the flag for the external zlib together with the internal libraries
    if(_LIBNAME STREQUAL "z")
      set(_EXTERNAL_ZLIB "-lz")
    else()
      list(APPEND _LIBRARY_NAMES ${_LIBNAME})
    endif()
  endforeach()

  # append components
  list(REMOVE_DUPLICATES ROOT_FIND_COMPONENTS)
  if(ROOT_FIND_COMPONENTS)
    set(_LIBRARY_NAMES "${_LIBRARY_NAMES};${ROOT_FIND_COMPONENTS}")
  endif()
  
  # check whether libraries exist
  foreach(_LIBNAME ${_LIBRARY_NAMES})
    find_library(_ROOT_LIB_${_LIBNAME}
      NAMES ${_LIBNAME}
      PATHS ${ROOT_LIBRARY_DIR}
      NO_DEFAULT_PATH)
    if(NOT _ROOT_LIB_${_LIBNAME})
      set(ROOT_FOUND FALSE)
      set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} Cannot find ROOT library ${_LIBNAME} in ${ROOT_LIBRARY_DIR}.")
    else()
      list(APPEND ROOT_LIBS ${_ROOT_LIB_${_LIBNAME}})
    endif()
  endforeach()

  # create list of external libraries from root-config output
  separate_arguments(ROOT_AUX_LIBRARIES)
  # append external zlib to auxiliary libraries
  if(_EXTERNAL_ZLIB)
    list(APPEND ROOT_AUX_LIBRARIES ${_EXTERNAL_ZLIB})
  endif()
  # loop over -l entries
  foreach(_LIBRARY ${ROOT_AUX_LIBRARIES})
    # extract library name from compiler flag
    string(REGEX MATCH "^-l(.*)$" _LIBNAME "${_LIBRARY}")
    if(_LIBNAME)
      string(REGEX REPLACE "^-.(.*)$" "\\1" _LIBNAME "${_LIBNAME}")
      # check whether libraries exist
      find_library(_AUX_LIB_${_LIBNAME}
	NAMES ${_LIBNAME})
      if(NOT _AUX_LIB_${_LIBNAME})
	set(ROOT_FOUND FALSE)
	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} Cannot find ROOT library ${_LIBNAME}.")
      else()
	list(APPEND ROOT_LIBS ${_AUX_LIB_${_LIBNAME}})
      endif()
    endif()
  endforeach()

endif()


# make variables changeable
mark_as_advanced(
  ROOT_INCLUDE_DIR
  ROOT_LIBRARY_DIR
  ROOT_LIBRARIES
  ROOT_LIBS
  ROOT_DEFINITIONS
)


# report result
if(ROOT_FOUND)
  message(STATUS "Found ROOT version ${ROOT_VERSION} r${ROOT_SVN_REVISION} in ${ROOTSYS}")
  message(STATUS "Using ROOT include dir ${ROOT_INCLUDE_DIR}")
  message(STATUS "Using ROOT library dir ${ROOT_LIBRARY_DIR}")
  message(STATUS "Using ROOT libraries: ${ROOT_LIBRARIES}")
  message(STATUS "Using ROOT additional components: ${ROOT_FIND_COMPONENTS}")
else()
  if(ROOT_FIND_REQUIRED)
    message(FATAL_ERROR "Unable to find requested ROOT installation:${ROOT_ERROR_REASON}")
  else()
    if(NOT ROOT_FIND_QUIETLY)
      message(STATUS "ROOT was not found.")
    endif()
  endif()
endif()


# macro that generates ROOT dictionary
function(root_generate_dictionary DICT_FILE INCLUDE_DIRS HEADER_FILES LINKDEF_FILE)

  if(NOT ROOT_FOUND)
    message(FATAL_ERROR "Impossible to generate dictionary ${DICT_FILE}, because no ROOT installation was found.")
  endif()
 
  # prepare command line argument for compiler definitions (put -D in front)
  set(_DEFINITIONS)
  get_property(_DEFS DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY COMPILE_DEFINITIONS)
  foreach(_DEF ${_DEFS})
    set(_DEFINITIONS "${_DEFINITIONS} -D${_DEF}")
  endforeach()
  separate_arguments(_DEFINITIONS)

  # prepare command line argument for include directories (put -I in front)
  set(_INCLUDES)
  foreach(_FILE ${INCLUDE_DIRS})
    set(_INCLUDES ${_INCLUDES} -I${_FILE})
  endforeach()
 
  # strip paths from header file names
  set(_HEADERS)
  foreach(_FILE ${HEADER_FILES})
    get_filename_component(_NAME ${_FILE} NAME)
    set(_HEADERS ${_HEADERS} ${_NAME})
  endforeach()

  # add dictionary header file to output files
  string(REGEX REPLACE "^(.*)\\.(.*)$" "\\1.h" _DICT_HEADER "${DICT_FILE}")
  set(OUTPUT_FILES ${DICT_FILE} ${_DICT_HEADER})

  add_custom_command(OUTPUT ${OUTPUT_FILES}
    COMMAND ${ROOTCINT_EXECUTABLE}
    ARGS -f ${DICT_FILE} -c -DHAVE_CONFIG_H ${_DEFINITIONS} ${_INCLUDES} ${_HEADERS} ${LINKDEF_FILE}
    DEPENDS ${HEADER_FILES} ${LINKDEF_FILE}
  )

endfunction(root_generate_dictionary)
Commit	Line	Data
da32329d AM	1	###########################################################################
	2	#
	3	# Copyright 2010
	4	#
	5	# This file is part of Starlight.
	6	#
	7	# Starlight is free software: you can redistribute it and/or modify
	8	# it under the terms of the GNU General Public License as published by
	9	# the Free Software Foundation, either version 3 of the License, or
	10	# (at your option) any later version.
	11	#
	12	# Starlight is distributed in the hope that it will be useful,
	13	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	# GNU General Public License for more details.
	16	#
	17	# You should have received a copy of the GNU General Public License
	18	# along with Starlight. If not, see <http://www.gnu.org/licenses/>.
	19	#
	20	###########################################################################
	21	#
	22	# File and Version Information:
	23	# $Rev:: 28 $: revision of last commit
	24	# $Author:: bgrube $: author of last commit
	25	# $Date:: 2010-12-10 19:30:01 +0100 #$: date of last commit
	26	#
	27	# Description:
	28	# cmake module for finding ROOT installation
	29	# requires root-config to be in PATH
	30	# based on AliRoots's FindROOT.cmake (r41015)
	31	# in https://alisoft.cern.ch/AliRoot/trunk/cmake/modules
	32	#
	33	# following variables are defined:
	34	# ROOT_CONFIG_EXECUTABLE - path to root-config program
	35	# ROOTSYS - path to root installation directory
	36	# ROOT_TARGET - target architecture
	37	# ROOT_F77 - Fortran complier used building ROOT
	38	# ROOT_CC - C complier used building ROOT
	39	# ROOT_CPP - C++ complier used building ROOT
	40	# ROOT_VERSION - ROOT version
	41	# ROOT_SVN_REVISION - ROOT subversion revision
	42	# ROOT_BIN_DIR - ROOT executable directory
	43	# ROOT_INCLUDE_DIR - ROOT header directory
	44	# ROOT_LIBRARY_DIR - ROOT library directory
	45	# ROOT_LIBRARIES - linker flags for ROOT libraries
	46	# ROOT_AUX_LIBRARIES - linker flags for auxiliary libraries
	47	# ROOTCINT_EXECUTABLE - path to rootcint program
	48	# ROOT_MAJOR_VERSION - ROOT major version
	49	# ROOT_MINOR_VERSION - ROOT minor version
	50	# ROOT_PATCH_VERSION - ROOT patch level
	51	# ROOT_LIBS - list of ROOT library files
	52	#
	53	# Example usage:
	54	# find_package(ROOT 5.26 REQUIRED Minuit2)
	55	#
	56	#
	57	# The module also provides a function to generate ROOT dictionaries.
	58	# Example usage:
	59	# set(ROOTPWA_DICTIONARY ${CMAKE_CURRENT_BINARY_DIR}/someDict.cc) # set dictionary path
	60	# root_generate_dictionary(
	61	# "${ROOTPWA_DICTIONARY}" # path to dictionary to generate
	62	# "${INCLUDE_DIR1};${INCLUDE_DIR2}" # list of includes
	63	# "class1.h;class2.h;class3.h" # list of classes to process
	64	# "someLinkDef.h" # ROOT linkDef file
65	# )
66	# set(SOURCES ${SOURCES} ${ROOTPWA_DICTIONARY}) # append dictionary to sources
67	#
68	#
69	###########################################################################
70
71
72	set(ROOT_FOUND FALSE)
73	set(ROOT_ERROR_REASON "")
74	set(ROOT_DEFINITIONS "")
75	set(ROOT_LIBS)
76
77
78	find_program(ROOT_CONFIG_EXECUTABLE root-config)
79	if(NOT ROOT_CONFIG_EXECUTABLE)
80	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} Cannot find root-config.")
81	else()
82
83	set(ROOT_FOUND TRUE)
84
85	execute_process(
86	COMMAND ${ROOT_CONFIG_EXECUTABLE} --prefix
87	OUTPUT_VARIABLE ROOTSYS
88	OUTPUT_STRIP_TRAILING_WHITESPACE)
89
90	execute_process(
91	COMMAND ${ROOT_CONFIG_EXECUTABLE} --arch
92	OUTPUT_VARIABLE ROOT_TARGET
93	OUTPUT_STRIP_TRAILING_WHITESPACE)
94
95	execute_process(
96	COMMAND ${ROOT_CONFIG_EXECUTABLE} --f77
97	OUTPUT_VARIABLE ROOT_F77
98	OUTPUT_STRIP_TRAILING_WHITESPACE)
99
100	execute_process(
101	COMMAND ${ROOT_CONFIG_EXECUTABLE} --cc
102	OUTPUT_VARIABLE ROOT_CC
103	OUTPUT_STRIP_TRAILING_WHITESPACE)
104
105	execute_process(
106	COMMAND ${ROOT_CONFIG_EXECUTABLE} --cxx
107	OUTPUT_VARIABLE ROOT_CPP
108	OUTPUT_STRIP_TRAILING_WHITESPACE)
109
110	execute_process(
111	COMMAND ${ROOT_CONFIG_EXECUTABLE} --version
112	OUTPUT_VARIABLE ROOT_VERSION
113	OUTPUT_STRIP_TRAILING_WHITESPACE)
114
115	execute_process(
116	COMMAND ${ROOT_CONFIG_EXECUTABLE} --svn-revision
117	OUTPUT_VARIABLE ROOT_SVN_REVISION
118	OUTPUT_STRIP_TRAILING_WHITESPACE)
119
120	execute_process(
121	COMMAND ${ROOT_CONFIG_EXECUTABLE} --bindir
122	OUTPUT_VARIABLE ROOT_BIN_DIR
123	OUTPUT_STRIP_TRAILING_WHITESPACE)
124	if(NOT EXISTS "${ROOT_BIN_DIR}")
125	set(ROOT_FOUND FALSE)
126	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT executable directory ${ROOT_BIN_DIR} does not exist.")
127	endif()
128
129	execute_process(
130	COMMAND ${ROOT_CONFIG_EXECUTABLE} --incdir
131	OUTPUT_VARIABLE ROOT_INCLUDE_DIR
132	OUTPUT_STRIP_TRAILING_WHITESPACE)
133	if(NOT EXISTS "${ROOT_INCLUDE_DIR}")
134	set(ROOT_FOUND FALSE)
135	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT include directory ${ROOT_INCLUDE_DIR} does not exist.")
136	endif()
137
138	execute_process(
139	COMMAND ${ROOT_CONFIG_EXECUTABLE} --libdir
140	OUTPUT_VARIABLE ROOT_LIBRARY_DIR
141	OUTPUT_STRIP_TRAILING_WHITESPACE)
142	if(NOT EXISTS "${ROOT_LIBRARY_DIR}")
143	set(ROOT_FOUND FALSE)
144	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT library directory ${ROOT_LIBRARY_DIR} does not exist.")
145	endif()
146
147	execute_process(
148	COMMAND ${ROOT_CONFIG_EXECUTABLE} --noauxlibs --glibs
149	OUTPUT_VARIABLE ROOT_LIBRARIES
150	OUTPUT_STRIP_TRAILING_WHITESPACE)
151
152	execute_process(
153	COMMAND ${ROOT_CONFIG_EXECUTABLE} --auxlibs
154	OUTPUT_VARIABLE ROOT_AUX_LIBRARIES
155	OUTPUT_STRIP_TRAILING_WHITESPACE)
156
157	find_program(ROOTCINT_EXECUTABLE rootcint)
158	if(NOT ROOTCINT_EXECUTABLE)
159	set(ROOT_FOUND FALSE)
160	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} Cannot find rootcint.")
161	endif()
162
163	# parse version string
164	string(REGEX REPLACE "^([0-9]+)\\.[0-9][0-9]+\\/[0-9][0-9]+.*" "\\1"
165	ROOT_MAJOR_VERSION "${ROOT_VERSION}")
166	string(REGEX REPLACE "^[0-9]+\\.([0-9][0-9])+\\/[0-9][0-9]+.*" "\\1"
167	ROOT_MINOR_VERSION "${ROOT_VERSION}")
168	string(REGEX REPLACE "^[0-9]+\\.[0-9][0-9]+\\/([0-9][0-9]+).*" "\\1"
169	ROOT_PATCH_VERSION "${ROOT_VERSION}")
da32329d AM	170	# make sure minor version is specified
	171	if(ROOT_FIND_VERSION AND NOT ROOT_FIND_VERSION_MINOR)
	172	message(FATAL_ERROR "When requesting a specific version of ROOT, you must provide at least the major and minor version numbers, e.g., 5.22")
	173	endif()
	174	# set patchlevel to 0, if not specified
	175	if(NOT ROOT_FIND_VERSION_PATCH)
	176	set(ROOT_FIND_VERSION_PATCH 0)
	177	endif()
	178	# compute an overall version number which can be compared at once
	179	math(EXPR _ROOT_FIND_VERSION "${ROOT_FIND_VERSION_MAJOR} * 10000 + ${ROOT_FIND_VERSION_MINOR} * 100 + ${ROOT_FIND_VERSION_PATCH}")
	180	math(EXPR _ROOT_VERSION "${ROOT_MAJOR_VERSION} * 10000 + ${ROOT_MINOR_VERSION} * 100 + ${ROOT_PATCH_VERSION}")
	181	# compare version
	182	if(ROOT_FIND_VERSION_EXACT)
	183	if(NOT _ROOT_VERSION EQUAL "${_ROOT_FIND_VERSION}")
	184	set(ROOT_FOUND FALSE)
	185	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT version ${ROOT_VERSION} does not match requested version ${ROOT_FIND_VERSION_MAJOR}.${ROOT_FIND_VERSION_MINOR}/${ROOT_FIND_VERSION_PATCH}.")
	186	endif()
	187	else()
	188	if(_ROOT_VERSION LESS "${_ROOT_FIND_VERSION}")
	189	set(ROOT_FOUND FALSE)
	190	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} ROOT version ${ROOT_VERSION} is lower than requested version ${ROOT_FIND_VERSION_MAJOR}.${ROOT_FIND_VERSION_MINOR}/${ROOT_FIND_VERSION_PATCH}.")
	191	endif()
	192	endif()
	193
	194	endif()
	195
	196
	197	# generate list of ROOT libraries
	198	if(ROOT_FOUND)
	199
	200	# create list of internal libraries from root-config output
	201	set(_LIBRARY_NAMES)
	202	set(_EXTERNAL_ZLIB)
	203	separate_arguments(ROOT_LIBRARIES)
	204	# remove first -L entry
	205	list(REMOVE_AT ROOT_LIBRARIES 0)
	206	# loop over -l entries
	207	foreach(_LIBRARY ${ROOT_LIBRARIES})
	208	# extract library name from compiler flag and append to list
	209	string(REGEX REPLACE "^-.(.*)$" "\\1" _LIBNAME "${_LIBRARY}")
	210	# workaround for root-config inconsistency: if ROOT is built with --disable-builtin-zlib
	211	# root-config returns the flag for the external zlib together with the internal libraries
	212	if(_LIBNAME STREQUAL "z")
	213	set(_EXTERNAL_ZLIB "-lz")
	214	else()
	215	list(APPEND _LIBRARY_NAMES ${_LIBNAME})
	216	endif()
	217	endforeach()
	218
	219	# append components
	220	list(REMOVE_DUPLICATES ROOT_FIND_COMPONENTS)
	221	if(ROOT_FIND_COMPONENTS)
	222	set(_LIBRARY_NAMES "${_LIBRARY_NAMES};${ROOT_FIND_COMPONENTS}")
	223	endif()
	224
	225	# check whether libraries exist
	226	foreach(_LIBNAME ${_LIBRARY_NAMES})
	227	find_library(_ROOT_LIB_${_LIBNAME}
	228	NAMES ${_LIBNAME}
	229	PATHS ${ROOT_LIBRARY_DIR}
	230	NO_DEFAULT_PATH)
	231	if(NOT _ROOT_LIB_${_LIBNAME})
	232	set(ROOT_FOUND FALSE)
	233	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} Cannot find ROOT library ${_LIBNAME} in ${ROOT_LIBRARY_DIR}.")
234	else()
235	list(APPEND ROOT_LIBS ${_ROOT_LIB_${_LIBNAME}})
236	endif()
237	endforeach()
238
239	# create list of external libraries from root-config output
240	separate_arguments(ROOT_AUX_LIBRARIES)
241	# append external zlib to auxiliary libraries
242	if(_EXTERNAL_ZLIB)
243	list(APPEND ROOT_AUX_LIBRARIES ${_EXTERNAL_ZLIB})
244	endif()
245	# loop over -l entries
246	foreach(_LIBRARY ${ROOT_AUX_LIBRARIES})
247	# extract library name from compiler flag
248	string(REGEX MATCH "^-l(.*)$" _LIBNAME "${_LIBRARY}")
249	if(_LIBNAME)
250	string(REGEX REPLACE "^-.(.*)$" "\\1" _LIBNAME "${_LIBNAME}")
251	# check whether libraries exist
252	find_library(_AUX_LIB_${_LIBNAME}
253	NAMES ${_LIBNAME})
254	if(NOT _AUX_LIB_${_LIBNAME})
255	set(ROOT_FOUND FALSE)
256	set(ROOT_ERROR_REASON "${ROOT_ERROR_REASON} Cannot find ROOT library ${_LIBNAME}.")
257	else()
258	list(APPEND ROOT_LIBS ${_AUX_LIB_${_LIBNAME}})
259	endif()
260	endif()
261	endforeach()
262
263	endif()
264
265
266	# make variables changeable
267	mark_as_advanced(
268	ROOT_INCLUDE_DIR
269	ROOT_LIBRARY_DIR
270	ROOT_LIBRARIES
271	ROOT_LIBS
272	ROOT_DEFINITIONS
273	)
274
275
276	# report result
277	if(ROOT_FOUND)
278	message(STATUS "Found ROOT version ${ROOT_VERSION} r${ROOT_SVN_REVISION} in ${ROOTSYS}")
279	message(STATUS "Using ROOT include dir ${ROOT_INCLUDE_DIR}")
280	message(STATUS "Using ROOT library dir ${ROOT_LIBRARY_DIR}")
281	message(STATUS "Using ROOT libraries: ${ROOT_LIBRARIES}")
282	message(STATUS "Using ROOT additional components: ${ROOT_FIND_COMPONENTS}")
283	else()
284	if(ROOT_FIND_REQUIRED)
285	message(FATAL_ERROR "Unable to find requested ROOT installation:${ROOT_ERROR_REASON}")
286	else()
287	if(NOT ROOT_FIND_QUIETLY)
288	message(STATUS "ROOT was not found.")
289	endif()
290	endif()
291	endif()
292
293
294	# macro that generates ROOT dictionary
295	function(root_generate_dictionary DICT_FILE INCLUDE_DIRS HEADER_FILES LINKDEF_FILE)
296
297	if(NOT ROOT_FOUND)
298	message(FATAL_ERROR "Impossible to generate dictionary ${DICT_FILE}, because no ROOT installation was found.")
299	endif()
300
301	# prepare command line argument for compiler definitions (put -D in front)
302	set(_DEFINITIONS)
303	get_property(_DEFS DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR} PROPERTY COMPILE_DEFINITIONS)
304	foreach(_DEF ${_DEFS})
305	set(_DEFINITIONS "${_DEFINITIONS} -D${_DEF}")
306	endforeach()
307	separate_arguments(_DEFINITIONS)
308
309	# prepare command line argument for include directories (put -I in front)
310	set(_INCLUDES)
311	foreach(_FILE ${INCLUDE_DIRS})
312	set(_INCLUDES ${_INCLUDES} -I${_FILE})
313	endforeach()
314
315	# strip paths from header file names
316	set(_HEADERS)
317	foreach(_FILE ${HEADER_FILES})
318	get_filename_component(_NAME ${_FILE} NAME)
319	set(_HEADERS ${_HEADERS} ${_NAME})
320	endforeach()
321
322	# add dictionary header file to output files
323	string(REGEX REPLACE "^(.)\\.(.)$" "\\1.h" _DICT_HEADER "${DICT_FILE}")
324	set(OUTPUT_FILES ${DICT_FILE} ${_DICT_HEADER})
325
326	add_custom_command(OUTPUT ${OUTPUT_FILES}
327	COMMAND ${ROOTCINT_EXECUTABLE}
328	ARGS -f ${DICT_FILE} -c -DHAVE_CONFIG_H ${_DEFINITIONS} ${_INCLUDES} ${_HEADERS} ${LINKDEF_FILE}
329	DEPENDS ${HEADER_FILES} ${LINKDEF_FILE}
330	)
331
332	endfunction(root_generate_dictionary)