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OR-Tools CMake Build Instructions

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Introduction

| Requirement | Dependencies | Options | C++ | Swig | Python 3 | .Net Core | Java | Integration | CI |

OR-Tools comes with a CMake based build (CMakeLists.txt) that can be used on a wide range of platforms (the "C" stands for cross-platform). If you don't have CMake installed already, you can download it for free from http://www.cmake.org/.

CMake works by generating native Makefiles or build projects that can be used in the compiler environment of your choice.
You can either build OR-Tools with CMake as a standalone project or it can be incorporated into an existing CMake project.

Requirement

You'll need:

  • CMake >= 3.18.
  • A C++20 compiler (gcc 8 or above)

Dependencies

OR-Tools depends on several mandatory libraries. You can compile them all at configure time using the option -DBUILD_DEPS=ON (OFF by default) or you can compile few of them using the options below (see CMake Options below).

  • ZLIB (BUILD_ZLIB),

  • Google Abseil-cpp (BUILD_absl),

  • Google Protobuf (BUILD_Protobuf),

  • GLPK (BUILD_GLPK),
    note: You can disable the support of GLPK solver by using -DUSE_GLPK=OFF (ON by default).

  • SCIP (BUILD_SCIP),
    note: You can disable the support of SCIP solver by using -DUSE_SCIP=OFF (ON by default).

  • COIN-OR solvers,

    • COIN-OR CoinUtils (BUILD_CoinUtils),
    • COIN-OR Osi (BUILD_Osi),
    • COIN-OR Clp (BUILD_Clp),
    • COIN-OR Cgl (BUILD_Cgl),
    • COIN-OR Cbc (BUILD_Cbc),
      note: You can disable the support of COIN-OR solvers (i.e. Cbc and Clp solver) by using -DUSE_COINOR=OFF (ON by default).

OR-Tools can also optionally (disabled by default) be compiled with support for the following third-party proprietary solvers:

  • CPLEX (USE_CPLEX),
  • XPRESS (USE_XPRESS)

warning: Since these solvers require license and are proprietary, we can't test it on public CI and support can be broken.

Enabling CPLEX Support

To enable CPLEX support, configure with -DUSE_CPLEX=ON and -DCPLEX_ROOT=/absolute/path/to/CPLEX/root/dir, replacing /absolute/path/to/CPLEX/root/dir with the path to your CPLEX installation. CPLEX_ROOT can also be defined as an environment variable rather than an option at configure time.

For ease of migration from legacy make third_party builds, CMake will also read the CPLEX installation path from the UNIX_CPLEX_DIR environment variable, if defined.

Enabling XPRESS Support

To enable XPRESS support, configure with -DUSE_XPRESS=ON and -DXPRESS_ROOT=/absolute/path/to/XPRESS/root/dir, replacing /absolute/path/to/XPRESS/root/dir with the path to your XPRESS installation. XPRESS_ROOT can also be defined as an environment variable rather than an option at configure time.

CMake Options

There are several options that can be passed to CMake to modify how the code is built.
For all of these options and parameters you have to use -D<Parameter_name>=<value>.

All CMake options are passed at configure time, i.e., by running
cmake -S. -B<your_chosen_build_directory> -DOPTION_ONE=ON -DOPTION_TWO=OFF ...
before running cmake --build <your_chosen_build_directory>

For example, to generate build files including dependencies in a new subdirectory called 'build', run:

cmake -S. -Bbuild -DBUILD_DEPS:BOOL=ON

and then build with:

cmake --build build

Following is a list of available options, for the full list run:

cmake -S. -Bbuild -LH
CMake Option Default Value Note
CMAKE_BUILD_TYPE Release see CMake documentation here
BUILD_CXX ON Build C++
BUILD_PYTHON OFF Build Python wrapper and package
BUILD_JAVA OFF Build Java wrapper and packages
BUILD_DOTNET OFF Build .Net wrapper and packages
BUILD_FLATZINC ON* Build the flatzinc library
Forced to OFF if BUILD_CXX=OFF
BUILD_GLOP OFF* Build the standalone Glop library
Forced to OFF if BUILD_CXX=ON, otherwise default to ON
BUILD_DEPS OFF* Default to ON if BUILD_JAVA=ON or BUILD_PYTHON=ON or BUILD_DOTNET=ON
BUILD_ZLIB OFF* Static build the zlib library
Forced to ON if BUILD_DEPS=ON
BUILD_absl OFF* Static build the abseil-cpp libraries
Forced to ON if BUILD_DEPS=ON
BUILD_Protobuf OFF* Static build the protobuf libraries
Forced to ON if BUILD_DEPS=ON
BUILD_re2 OFF* Static build the re2 libraries
Forced to ON if BUILD_DEPS=ON
BUILD_Eigen3 OFF* Static build the Eigen3 libraries
Forced to ON if BUILD_DEPS=ON
USE_COINOR ON* Enable Coin-OR support
Forced to OFF if BUILD_CXX=OFF
BUILD_CoinUtils OFF* Static build the CoinUtils library
Forced to ON if USE_COINOR=ON and BUILD_DEPS=ON
BUILD_Osi OFF* Static build the Osi library
Forced to ON if USE_COINOR=ON and BUILD_DEPS=ON
BUILD_Clp OFF* Static build the Clp library
Forced to ON if USE_COINOR=ON and BUILD_DEPS=ON
BUILD_Cgl OFF* Static build the Cgl library
Forced to ON if USE_COINOR=ON and BUILD_DEPS=ON
BUILD_Cbc OFF* Static build the Cbc library
Forced to ON if USE_COINOR=ON and BUILD_DEPS=ON
USE_GLPK ON* Enable GLPK support
Forced to OFF if BUILD_CXX=OFF
BUILD_GLPK OFF* Static build the GLPK libraries
Forced to ON if USE_GLPK=ON and BUILD_DEPS=ON
USE_SCIP ON* Enable SCIP support
Forced to OFF if BUILD_CXX=OFF
BUILD_SCIP OFF* Static build the SCIP libraries
Forced to ON if USE_SCIP=ON and BUILD_DEPS=ON
USE_CPLEX OFF Enable CPLEX support
USE_XPRESS OFF Enable XPRESS support
BUILD_SAMPLES ON* Build all samples
Default to ON if BUILD_DEPS=ON
BUILD_CXX_SAMPLES ON* Build all C++ samples
Forced to OFF if BUILD_CXX=OFF or BUILD_SAMPLE=OFF
BUILD_PYTHON_SAMPLES ON* Build all Python samples
Forced to OFF if BUILD_PYTHON=OFF or BUILD_SAMPLE=OFF
BUILD_JAVA_SAMPLES ON* Build all Java samples
Forced to OFF if BUILD_JAVA=OFF or BUILD_SAMPLE=OFF
BUILD_DOTNET_SAMPLES ON* Build all .Net samples
Forced to OFF if BUILD_DOTNET=OFF or BUILD_SAMPLE=OFF
BUILD_EXAMPLES ON* Build all examples
Default to ON if BUILD_DEPS=ON
BUILD_CXX_EXAMPLES ON* Build all C++ examples
Forced to OFF if BUILD_CXX=OFF or BUILD_SAMPLE=OFF
BUILD_PYTHON_EXAMPLES ON* Build all Python examples
Forced to OFF if BUILD_PYTHON=OFF or BUILD_SAMPLE=OFF
BUILD_JAVA_EXAMPLES ON* Build all Java examples
Forced to OFF if BUILD_JAVA=OFF or BUILD_SAMPLE=OFF
BUILD_DOTNET_EXAMPLES ON* Build all .Net examples
Forced to OFF if BUILD_DOTNET=OFF or BUILD_SAMPLE=OFF
SKIP_GPG OFF Disable GPG sign
Only available if BUILD_JAVA=ON
UNIVERSAL_JAVA_PACKAGE OFF Build a multi platform package (i.e. ortools-java will depends on all native packages)
Only available if BUILD_JAVA=ON
BUILD_FAT_JAR OFF Build a ortools-java .jar that includes all of its own Maven dependencies, including the native package
Only available if BUILD_JAVA=ON
FETCH_PYTHON_DEPS BUILD_DEPS Fetch python modules needed to build ortools package
Only available if BUILD_PYTHON=ON

Integrating OR-Tools in your CMake Project

You should be able to integrate OR-Tools in your C++ CMake project following one of these methods.

For API/ABI compatibility reasons, if you will be using OR-Tools inside a larger C++ project, we recommend using CMake and incorporate OR-Tools as a CMake subproject (i.e. using add_sudirectory() or FetchContent).

Consuming OR-Tools in a CMake Project

If you already have OR-Tools installed in your system, you can use the CMake command find_package() to include OR-Tools in your C++ CMake Project.

note: You may need to set CMAKE_PREFIX_PATH in order for CMake to find your OR-Tools installation.

cmake_minimum_required(VERSION 3.14)
project(myproj VERSION 1.0)

find_package(ortools CONFIG REQUIRED)

add_executable(myapp main.cpp)
target_link_libraries(myapp ortools::ortools)

Include directories, compile definitions and compile options will be added automatically to your target as needed.

Incorporating OR-Tools into a CMake Super Project

Using add_subdirectory

The recommendations below are similar to those for using CMake within the googletest framework (https://github.com/google/googletest/blob/master/googletest/README.md#incorporating-into-an-existing-cmake-project)

Thus, you can use the CMake command add_subdirectory() to include OR-Tools directly from a subdirectory of your C++ CMake project.
Note: The ortools::ortools target is in this case an ALIAS library target for the ortools library target.

cmake_minimum_required(VERSION 3.14)
project(myproj VERSION 1.0)

add_subdirectory(or-tools)

add_executable(myapp main.cpp)
target_link_libraries(myapp ortools::ortools)

Again, include directories, compile definitions and compile options will be added automatically to your target as needed.

Using FetchContent

If you have CMake >= 3.14.7 you can use the built-in module FetchContent instead. Note: The ortools::ortools target is in this case an ALIAS library target for the ortools library target.

cmake_minimum_required(VERSION 3.14)
project(myproj VERSION 1.0 LANGUAGES CXX)

include(FetchContent)
FetchContent_Declare(
  or-tools
  GIT_REPOSITORY https://github.com/google/or-tools.git
  GIT_TAG        master
)

# After the following call, the CMake targets defined by or-tools
# will be defined and available to the rest of the build
FetchContent_MakeAvailable(or-tools)

add_executable(myapp main.cpp)
target_link_libraries(myapp ortools::ortools)

note: You may need to use the option -DBUILD_DEPS=ON to get all or-tools dependencies as well.