Add a CMakeLists.txt for compiling with cmake

CMakeLists.txt

@@ -0,0 +1,103 @@
+cmake_minimum_required( VERSION 3.11 FATAL_ERROR )
+set(CMAKE_CXX_STANDARD 17)
+project(CMSCombine VERSION 0.0.1)
+
+# Can build with CMake after e.g. setting up StatAnalysis release like this:
+# export ATLAS_LOCAL_ROOT_BASE=/cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase
+# source $ATLAS_LOCAL_ROOT_BASE/user/atlasLocalSetup.sh; asetup StatAnalysis,0.3.2
+# mkdir build; cd build
+# cmake path/to/source # change this path to where-ever you cloned Combine repo to
+# make -j4
+
+list(APPEND CMAKE_PREFIX_PATH $ENV{ROOTSYS})
+find_package( ROOT REQUIRED COMPONENTS Core MathMore RooFitCore RooFit RooStats Minuit HistFactory )
+find_package(Eigen3 REQUIRED)
+find_package(Vdt)
+find_package(LCG QUIET) # only used for FindBoost in StatAnalysis
+find_package( Boost REQUIRED COMPONENTS program_options filesystem )
+
+message(STATUS "Using ROOT From: ${ROOT_INCLUDE_DIRS}")
+include(${ROOT_USE_FILE})
+
+include_directories(${ROOT_INCLUDE_DIRS})
+
+add_definitions(${ROOT_CXX_FLAGS})
+
+set(LIBNAME CMSCombine)
+
+file(GLOB HEADERS RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} interface/*.h)
+file(GLOB SOURCES RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} src/*.c*)
+
+# includes require "HiggsAnalysis/CombinedLimit" prefix in many places
+# so create a symlink in the build dir
+file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/HiggsAnalysis)
+execute_process(COMMAND ${CMAKE_COMMAND} -E create_symlink "${CMAKE_CURRENT_SOURCE_DIR}" "${CMAKE_CURRENT_BINARY_DIR}/HiggsAnalysis/CombinedLimit" )
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
+
+ROOT_GENERATE_DICTIONARY(G__${LIBNAME} ${CMAKE_CURRENT_SOURCE_DIR}/src/classes.h LINKDEF src/classes_def.xml
+        MODULE ${LIBNAME}
+        OPTIONS --deep)
+add_library(${LIBNAME} SHARED ${SOURCES} G__${LIBNAME}.cxx)
+set_target_properties(${LIBNAME} PROPERTIES PUBLIC_HEADER "${HEADERS}")
+target_link_libraries (${LIBNAME} Eigen3::Eigen ${ROOT_LIBRARIES} ${Boost_LIBRARIES} VDT::VDT)
+
+add_executable(combine bin/combine.cpp)
+target_link_libraries(combine PUBLIC ${LIBNAME})
+
+
+# Create empty __init__.py file in the build directory that will be installed
+# in the Python library directories.
+set(empty_init_py "${CMAKE_CURRENT_BINARY_DIR}/__init__.py")
+
+#####################
+# Installation part #
+#####################
+
+
+# Install the dictionaries.
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/lib${LIBNAME}_rdict.pcm
+        ${CMAKE_CURRENT_BINARY_DIR}/lib${LIBNAME}.rootmap
+        DESTINATION lib)
+
+# Install the libraries and header files.
+install(TARGETS ${LIBNAME}
+        LIBRARY DESTINATION lib
+        PUBLIC_HEADER DESTINATION include/HiggsAnalysis/CombinedLimit/interface
+        )
+
+# Install the "combine" executable in the bin directory.
+install(TARGETS combine DESTINATION bin)
+
+# Install the scripts like "text2workspace" to the bin directory.
+install(DIRECTORY scripts/ DESTINATION bin)
+
+# This block is commented out for now, while using the less sophisticated location below
+# Check if the Python library installation directory is outside the install
+# prefix. If it is, we error out because CMake should not install files outside
+# the prefix. In the future, one can imagine to let the user choose where the
+# Python libraries get installed in the prefix with a CMake configuration flag.
+#find_package(Python COMPONENTS Interpreter Development) # To get the Python library install directory into Python_SITELIB
+#cmake_path(IS_PREFIX CMAKE_INSTALL_PREFIX "${Python_SITELIB}" sitelib_in_prefix)
+#if(NOT ${sitelib_in_prefix})
+#    message( FATAL_ERROR "Your Python library installation directory ${Python_SITELIB} "
+#            "is outside the install prefix ${CMAKE_INSTALL_PREFIX}! "
+#            "This is not supported for now. Consider changing the install prefix "
+#            "with the -DCMAKE_INSTALL_PREFIX:PATH=<path> cmake configuration option.")
+#endif()
+#
+## The the Python library installation directory relative to the install prefix.
+#file(RELATIVE_PATH Python_SITELIB_IN_PREFIX ${CMAKE_INSTALL_PREFIX} ${Python_SITELIB})
+
+set(Python_SITELIB_IN_PREFIX "python")
+
+
+message (STATUS "Using Python install location:" ${Python_SITELIB_IN_PREFIX})
+# The python package will be installed in such a way that the original
+# CMSSW-style directory structure is kept, for maximal compatibility.
+install(DIRECTORY python/ DESTINATION ${Python_SITELIB_IN_PREFIX}/HiggsAnalysis/CombinedLimit)
+
+# Create empty __init__.py files in the Python package subdirectories such that
+# the Python imports work.
+file(TOUCH ${empty_init_py})
+INSTALL(FILES ${empty_init_py} DESTINATION ${Python_SITELIB_IN_PREFIX}/HiggsAnalysis/__init__.py)
+INSTALL(FILES ${empty_init_py} DESTINATION ${Python_SITELIB_IN_PREFIX}/HiggsAnalysis/CombinedLimit/__init__.py)