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Using CMake in GAUDI based Projects

Using CMake in GAUDI based Projects. Understanding its Feasibility P. Mato/CERN, September 8 th , 2010. Why changing the build system?. CMT (has became) is too complex Too many concepts: macros, sets, tags, patterns, fragments, actions, projects, packages, etc.

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Using CMake in GAUDI based Projects

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  1. Using CMake in GAUDI based Projects Understanding its Feasibility P. Mato/CERN, September 8th, 2010

  2. Why changing the build system? • CMT (has became) is too complex • Too many concepts: macros, sets, tags, patterns, fragments, actions, projects, packages, etc. • Relatively simple build operations require complicated interactions between these concepts • CMT is too slow • The added complexity has caused CMT to became slower and slower • Big improvements in speed are not in horizon • Missing support for new IDEs • Eclipse, XCode, VisualStudio9, etc. Using CMake in GAUDI based Projects - P. Mato/CERN

  3. Why CMake? • Generates native build environments. It does not do the build itself • UNIX/Linux->Makefiles • Windows->VSProjects/Workspaces • Apple->Xcode • Open-Source, Cross-Platform, Docs, etc. • Can cope with complex, large build environments • Flexible & Extensible • Scripting language (turing-complete) • Modules for finding/configuring software • Extensible to new platforms and languages • Create custom targets/commands • Run external programs Using CMake in GAUDI based Projects - P. Mato/CERN

  4. Main Questions 1. Can we build GAUDI (and other LHCb projects) with CMake? • What about the build performance? • What about the support for IDEs? • Is anything missing? 2. What would be the impact for end-users? • Can we reproduce the same functionality? • How difficult would be to learn the new system? 3. Can we ‘automatically’ migrate from CMT to Cmake? • Would it be possible the co-existence of both systems in parallel? Using CMake in GAUDI based Projects - P. Mato/CERN

  5. Tested with GAUDI, LHCB and REC • Exercised with GAUDI and LHCb projects • Easy to learn and produce high-level macros that build the major products (linker/component libraries, dictionaries, test programs, etc.) • Product installation can be made identical to CMT • CMake does not runtime environment setting • Needed to generate setup file at build/install time • Tested on SLC5, MacOSX and Windows • Verified that generation for Xcode and Eclipse works nicely (not completely finished) • Make it work also for Windows (nmake, vcexpress) • Converted all tests to Ctest • CppUnit, QMtest Using CMake in GAUDI based Projects - P. Mato/CERN

  6. A Macro Example #------------------------------------------------------------------- #---GAUDI_LINKER_LIBRARY ( <name> src1 src2 ... LIBRARIES lib1 ...) #------------------------------------------------------------------- function(GAUDI_LINKER_LIBRARY library sources ) PARSE_ARGUMENTS(ARG "LIBRARIES" "" ${ARGN}) foreach( fp ${ARG_DEFAULT_ARGS}) file(GLOB files src/${fp}) if(files) set( lib_srcs ${lib_srcs} ${files}) else() set( lib_srcs ${lib_srcs} ${fp}) endif() endforeach() add_library( ${library} ${lib_srcs}) set_target_properties(${library} PROPERTIES COMPILE_FLAGS –DGAUDI_ target_link_libraries(${library} ${ARGN}) if(TARGET ${library}Obj2doth) add_dependencies( ${library} ${library}Obj2doth) endif() #----Installation details----------------------------------------- install(TARGETS ${library} LIBRARY DESTINATION ${lib}) endfunction() Using CMake in GAUDI based Projects - P. Mato/CERN

  7. Performance • Comparison between cmt and cmake • Same code version, some machine • “cmt br make –j8” vs. “make –s –j8” • LHCB has ~ 100 packages, REC ~ 50 packages X ~4 X ~7 X ~5 Using CMake in GAUDI based Projects - P. Mato/CERN

  8. projectA cmake packA hat src doc packA src doc packB packB Project Source Structure CMakeList CMakeList CMakeList Using CMake in GAUDI based Projects - P. Mato/CERN

  9. Missing Functionality • Package dependencies • CMake [only] takes care of the library dependencies within a project and across projects (export/import) • Invented GAUDI_USE_PACKAGE() to emulate CMT use statement (mainly used to set the –I and –L) • Project dependencies • Invented GAUDI_USE_PROJECT() to emulate CMT project use statement (CMake module path, LD_LIBRARY_PATH, etc.) • Runtime environment • Generation of setup files possible • Windows DLL libraries exporting all symbols • Generation of .DEF files Using CMake in GAUDI based Projects - P. Mato/CERN

  10. Example: GaudiKernel GAUDI_USE_PACKAGE(Boost) GAUDI_USE_PACKAGE(CppUnit) GAUDI_USE_PACKAGE(ROOT) #---Libraries------------------------------------------------------------------ GAUDI_LINKER_LIBRARY(GaudiKernelLib/*.cpp LIBRARIES ${ROOT_LIBRARIES} ${Boost_LIBRARIES}) #---Executablesand Tests------------------------------------------------------ GAUDI_EXECUTABLE(genconfUtil/genconf.cpp LIBRARIES GaudiKernel) GAUDI_UNIT_TEST(DirSearchPath_test ../tests/src/DirSearchPath_test.cpp LIBRARIES GaudiKernel) GAUDI_UNIT_TEST(test_SerializeSTL ../tests/src/test_SerializeSTL.cpp LIBRARIES GaudiKernelcppunit) #---Dictionaries--------------------------------------------------------------- REFLEX_BUILD_DICTIONARY(GaudiKerneldict/dictionary.hdict/dictionary.xml LIBRARIES GaudiKernel) #--Installation---------------------------------------------------------------- GAUDI_INSTALL_HEADERS(GaudiKernel) GAUDI_INSTALL_PYTHON_MODULES() GAUDI_INSTALL_SCRIPTS() Library name Sources Dependent libraries

  11. Example: Event/TrackEvent GAUDI_USE_PACKAGE(Kernel/LHCbKernel) GAUDI_USE_PACKAGE(GSL) GAUDI_USE_PACKAGE(Boost) INCLUDE(GaudiObjDesc) #---GOD Headers----------------------------------------------------- GOD_BUILD_HEADERS(xml/*.xml) #---Libraries------------------------------------------------------- GAUDI_LINKER_LIBRARY(TrackEvent *.cpp LHCbKernel GaudiKernel ${ROOT_LIBRARIES} MathCore GenVector ${GSL_LIBRARIES}) #---GOD Dictionary-------------------------------------------------- GOD_CUSTOM_DICTIONARY(dict/lcgDict.h xml/lcgdict/lcg_selection.xml) GOD_BUILD_DICTIONARY(xml/*.xml) #---Installation---------------------------------------------------- GAUDI_INSTALL_HEADERS(Event)

  12. Example: LHCB project CMAKE_MINIMUM_REQUIRED(VERSION 2.4.6) INCLUDE($ENV{CMAKEGAUDIPROJECT}) #------------------------------------------------------------- GAUDI_PROJECT(LHCB v31r4) GAUDI_USE_PROJECT(GAUDI v21r10p1) INCLUDE(GaudiPolicy) GAUDI_USE_PACKAGE(Boost) GAUDI_USE_PACKAGE(ROOT) GAUDI_USE_PACKAGE(AIDA) GAUDI_USE_PACKAGE(CLHEP) GAUDI_GET_PACKAGES(packages) GAUDI_SORT_PACKAGES( packages ${packages}) foreach( package ${packages}) add_subdirectory(${package}) endforeach() GAUDI_PROJECT_VERSION_HEADER() GAUDI_BUILD_PROJECT_SETUP() Project Declaration Project Dependencies Common commands and package dependencies Find dynamically all packages and sort them out (not really needed) Project build artifacts

  13. Impact for CMT users • In the prototype I have ‘copied’ the same structure of CMT, project organization and main procedures • Some exceptions: • The build is done out-of-source • The installation step is done after the build (make install) • We could take advantage of the new functionality • Managing ‘build’ options and cache them Using CMake in GAUDI based Projects - P. Mato/CERN

  14. Migration from CMT • Developed a small python script that is able to ‘translate’ CMT packages to CMake • It makes use of the knowledge CMT has of the package (cmt show uses; cmt show constituents; cmt show <library>_use_linkopts; etc.) • It works almost 100% for LHCB and REC projects • The results can be committed to SVN and keep them in sync either by hand or re-run the script • Building projects with CMake can produce exactly the same output • In principle is easy to test the build results Using CMake in GAUDI based Projects - P. Mato/CERN

  15. Summary 1. Can we build GAUDI (and other LHCb projects) with CMake?YES. It has been quite easy. Scripting has been essential. • What about the build performance? Much better than CMT • What about the support for IDEs? Very good so far • Is anything missing? Few things: dependencies, runtime env. I could easily implement so far the missing functionality 2. What would be the impact for end-users?I think is small. The paradigm is the same • Can we reproduce the same functionality? I think so E.g. user package overriding an existing released one, etc. • How difficult would be to learn the new system?Trivial ‘translation’ of requirements to CMakeLists files Good native CMake documentation 3. Can we ‘automatically’ migrate from CMT to CMake? YES • Would it be possible the co-existence of both systems in parallel?I think so Using CMake in GAUDI based Projects - P. Mato/CERN

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