# #//===----------------------------------------------------------------------===// #// #// The LLVM Compiler Infrastructure #// #// This file is dual licensed under the MIT and the University of Illinois Open #// Source Licenses. See LICENSE.txt for details. #// #//===----------------------------------------------------------------------===// # ========================================================== How to Build the LLVM* OpenMP* Runtime Library using CMake ========================================================== ==== Version of CMake required: v2.8.0 or above ==== ============================================ How to call cmake initially, then repeatedly ============================================ - When calling cmake for the first time, all needed compiler options must be specified on the command line. After this initial call to cmake, the compiler definitions must not be included for further calls to cmake. Other options can be specified on the command line multiple times including all definitions in the Build options section below. - Example of configuring, building, reconfiguring, rebuilding: $ mkdir build $ cd build $ cmake -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DLIBOMP_ARCH=i386 .. # Initial configuration $ make ... $ make clean $ cmake -DLIBOMP_ARCH=x86_64 -DCMAKE_BUILD_TYPE=Debug .. # Second configuration $ make ... $ rm -rf * $ cmake -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DLIBOMP_ARCH=x86_64 .. # Third configuration $ make - Notice in the example how the compiler definitions are only specified for an empty build directory, but other Build options are used at any time. - The file CMakeCache.txt which is created after the first call to cmake is a configuration file which holds all the values for the Build options. These configuration values can be changed using a text editor to modify CMakeCache.txt as opposed to using definitions on the command line. - To have cmake create a particular type of build generator file simply inlude the -G option: $ cmake -G "Unix Makefiles" ... You can see a list of generators cmake supports by executing cmake with no arguments and a list will be printed. ===================== Instructions to Build ===================== $ cd libomp_top_level/ [ directory with src/ , exports/ , tools/ , etc. ] $ mkdir build $ cd build [ Unix* Libraries ] $ cmake -DCMAKE_C_COMPILER= -DCMAKE_CXX_COMPILER= .. [ Intel(R) Many Integrated Core Library (Intel(R) MIC Library) ] $ cmake -DCMAKE_C_COMPILER= -DCMAKE_CXX_COMPILER= -DLIBOMP_ARCH=mic .. [ Windows Libraries ] $ cmake -G -DCMAKE_C_COMPILER= -DCMAKE_CXX_COMPILER= -DCMAKE_ASM_MASM_COMPILER=[ml | ml64] -DCMAKE_BUILD_TYPE=Release .. $ make $ make install ================== Mac* Fat Libraries ================== On OS X* machines, it is possible to build universal (or fat) libraries which include both i386 and x86_64 architecture objects in a single archive. $ cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_OSX_ARCHITECTURES='i386;x86_64' .. $ make There is also an option -DLIBOMP_OSX_ARCHITECTURES which can be set in case this is an LLVM source tree build which will only set the libomp library to a universal fat library and prevent having the entire llvm/clang build produce universal binaries. =========== Micro tests =========== After the library has been built, there are five optional microtests that can be performed. Some will be skipped based upon the platform. To run the tests, $ make libomp-micro-tests ============= CMake options ============= -DCMAKE_C_COMPILER= Specify the C compiler -DCMAKE_CXX_COMPILER= Specify the C++ compiler -DCMAKE_Fortran_COMPILER= This option is only needed when -DLIBOMP_FORTRAN_MODULES is on. So typically, a Fortran compiler is not needed during the build. Specify the Fortran compiler -DCMAKE_ASM_MASM_COMPILER=[ml | ml64 ] This option is Windows* Only -DLIBOMP_ARCH=i386|x86_64|arm|ppc64|ppc64le|aarch64|mic The default for the option is chosen based on the probing the compiler for architecture macros (e.g., is __x86_64__ predefined by compiler?). ==== First values listed are the default value ==== -DLIBOMP_LIB_TYPE=normal|profile|stubs Library type can be normal, profile, or stubs. -DCMAKE_BUILD_TYPE=Release|Debug|RelWithDebInfo Build type can be Release, Debug, or RelWithDebInfo. -DLIBOMP_OMP_VERSION=45|40|30 OpenMP version can be either 45, 40 or 30. -DLIBOMP_MIC_ARCH=knc|knf This value is ignored if LIBOMP_ARCH != mic Intel(R) MIC Architecture, can be knf or knc. -DLIBOMP_FORTRAN_MODULES=off|on Should the Fortran modules be created (requires Fortran compiler) -DLIBOMP_USE_ADAPTIVE_LOCKS=on|off Should adaptive (TSX-based) locks be included? These are x86 specific. This feature is turned on by default for i386 and x86_64. Otherwise, it is turned off. -DLIBOMP_USE_INTERNODE_ALIGNMENT=off|on Should 4096-byte alignment be used for certain data structures? This option is useful on multinode systems where a small CACHE_LINE setting leads to false sharing. This option is off by default. -DLIBOMP_USE_VERSION_SYMBOLS=on|off Should versioned symbols be used for building the library? This option only makes sense for ELF based libraries where version symbols are supported (Linux, some BSD* variants). It is off by default for Windows and Mac, but on for other Unix based operating systems. -DLIBOMP_ENABLE_SHARED=on|off Shared library instead of static library? (Note: static libraries are not supported on Windows). If LIBOMP_ENABLE_SHARED is off, then static OpenMP libraries will be built instead of dynamic ones. -DLIBOMP_OMPT_SUPPORT=off|on Should OMPT support be included in the build? (Not supported on Windows) If LIBOMP_OMPT_SUPPORT is off, then both ompt_blame and ompt_trace are ignored. -DLIBOMP_OMPT_BLAME=on|off Should OMPT blame functionality be included in the build? -DLIBOMP_OMPT_TRACE=on|off Should OMPT trace functionality be included in the build? -DLIBOMP_STATS=off|on Should include stats-gathering code be included in the build? -DLIBOMP_USE_DEBUGGER=off|on Should the friendly debugger interface be included in the build? -DLIBOMP_USE_HWLOC=off|on Should the Hwloc library be used for affinity? This option is not supported on Windows. http://www.open-mpi.org/projects/hwloc -DLIBOMP_HWLOC_INSTALL_DIR=/path/to/hwloc/install/dir Default: /usr/local This option is only used if LIBOMP_USE_HWLOC is on. Specifies install location of Hwloc. The configuration system will look for hwloc.h in ${LIBOMP_HWLOC_INSTALL_DIR}/include and the library in ${LIBOMP_HWLOC_INSTALL_DIR}/lib. -DLIBOMP_LLVM_LIT_EXECUTABLE=/path/to/llvm-lit Default: search in PATH Specifiy full path to llvm-lit executable for running tests. -DOPENMP_LLVM_TOOLS_DIR=/path/to/built/llvm/tools Default: search for tools in path Additional path to search for LLVM tools needed by tests. ================================ How to append flags to the build ================================ - These flags are *appended*. They do not overwrite any of the preset flags. -DLIBOMP_CPPFLAGS= -- Additional C preprocessor flags -DLIBOMP_CFLAGS= -- Additional C compiler flags -DLIBOMP_CXXFLAGS= -- Additional C++ compiler flags -DLIBOMP_ASMFLAGS= -- Additional assembly flags -DLIBOMP_LDFLAGS= -- Additional linker flags -DLIBOMP_LIBFLAGS= -- Additional libraries to link -DLIBOMP_FFLAGS= -- Additional Fortran compiler flags ======================= Example usages of CMake ======================= ---- Typical usage ---- cmake -DCMAKE_C_COMPILER=icc -DCMAKE_CXX_COMPILER=icpc .. cmake -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ .. cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ .. ---- With Various Options ---- - Build the i386 Linux library using GCC* cmake -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DLIBOMP_ARCH=i386 .. - Build the x86_64 debug Mac library using Clang* cmake -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DLIBOMP_ARCH=x86_64 -DCMAKE_BUILD_TYPE=Debug .. - Build the library (architecture determined by probing compiler) using the Intel(R) C Compiler and the Intel(R) C++ Compiler. Also, create the fortran modules using the Intel(R) Fortran Compiler. cmake -DCMAKE_C_COMPILER=icc -DCMAKE_CXX_COMPILER=icpc -DCMAKE_Fortran_COMPILER=ifort -DLIBOMP_FORTRAN_MODULES=on .. - Have CMake Find the C/C++ compiler, and specify additional flags for the C compiler, preprocessor, and C++ compiler. cmake -DLIBOMP_CFLAGS='-specific-flag' -DLIBOMP_CPPFLAGS='-DNEW_FEATURE=1 -DOLD_FEATURE=0' -DLIBOMP_CXXFLAGS='--one-specific-flag --two-specific-flag' .. ---- Build the stubs library ---- cmake -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++ -DLIBOMP_LIB_TYPE=stubs .. ========= Footnotes ========= [*] Other names and brands may be claimed as the property of others.