CMakeLists.txt

# Copyright 2010-2024 Google LLC
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# This file is just an orchestration
cmake_minimum_required(VERSION 3.20)
list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")

include(utils)
set_version(VERSION)

project(ortools VERSION ${VERSION} LANGUAGES CXX C)
set(PROJECT_NAMESPACE ortools)
message(STATUS "${PROJECT_NAME} version: ${PROJECT_VERSION}")
#message(STATUS "major: ${PROJECT_VERSION_MAJOR}")
#message(STATUS "minor: ${PROJECT_VERSION_MINOR}")
#message(STATUS "patch: ${PROJECT_VERSION_PATCH}")

if(MSVC)
  set(CMAKE_CXX_STANDARD 20)
else()
  set(CMAKE_CXX_STANDARD 17)
endif()
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# Set max os target version.
set(CMAKE_OSX_DEPLOYMENT_TARGET 10.15)

# Default Build Type to be Release
get_property(isMultiConfig GLOBAL PROPERTY GENERATOR_IS_MULTI_CONFIG)
if(isMultiConfig)
  if(NOT CMAKE_CONFIGURATION_TYPES)
    set(CMAKE_CONFIGURATION_TYPES "Release;Debug" CACHE STRING
    "Choose the type of builds, options are: Debug Release RelWithDebInfo MinSizeRel. (default: Release;Debug)"
    FORCE)
  endif()
  message(STATUS "Configuration types: ${CMAKE_CONFIGURATION_TYPES}")
else()
  if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE "Release" CACHE STRING
    "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel. (default: Release)"
    FORCE)
  endif()
  message(STATUS "Build type: ${CMAKE_BUILD_TYPE}")
endif()

# Layout build dir like install dir
include(GNUInstallDirs)
if(UNIX)
  option(BUILD_SHARED_LIBS "Build shared libraries (.so or .dylib)." ON)
  set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_LIBDIR})
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
  # for multi-config build system (e.g. Xcode, Ninja Multi-Config)
  foreach(OUTPUTCONFIG IN LISTS CMAKE_CONFIGURATION_TYPES)
    string(TOUPPER ${OUTPUTCONFIG} OUTPUTCONFIG)
    set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_${OUTPUTCONFIG} ${CMAKE_BINARY_DIR}/${OUTPUTCONFIG}/${CMAKE_INSTALL_LIBDIR})
    set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_${OUTPUTCONFIG} ${CMAKE_BINARY_DIR}/${OUTPUTCONFIG}/${CMAKE_INSTALL_LIBDIR})
    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_${OUTPUTCONFIG} ${CMAKE_BINARY_DIR}/${OUTPUTCONFIG}/${CMAKE_INSTALL_BINDIR})
  endforeach()
else()
  # Currently Only support static build for windows
  option(BUILD_SHARED_LIBS "Build shared libraries (.dll)." OFF)
  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
  # for multi-config builds (e.g. msvc)
  foreach(OUTPUTCONFIG IN LISTS CMAKE_CONFIGURATION_TYPES)
    string(TOUPPER ${OUTPUTCONFIG} OUTPUTCONFIG)
    set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_${OUTPUTCONFIG} ${CMAKE_BINARY_DIR}/${OUTPUTCONFIG}/${CMAKE_INSTALL_BINDIR})
    set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_${OUTPUTCONFIG} ${CMAKE_BINARY_DIR}/${OUTPUTCONFIG}/${CMAKE_INSTALL_BINDIR})
    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_${OUTPUTCONFIG} ${CMAKE_BINARY_DIR}/${OUTPUTCONFIG}/${CMAKE_INSTALL_BINDIR})
  endforeach()
endif()

if(MSVC AND BUILD_SHARED_LIBS)
  set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
endif()

# Disable CTest targets
set_property(GLOBAL PROPERTY CTEST_TARGETS_ADDED 1)
include(CTest)

# By default only build the C++ library which agregate all components.
option(BUILD_CXX "Build C++ library" ON)
message(STATUS "Build C++ library: ${BUILD_CXX}")

# If we don't build ortools we could build the GLOP standalone project
if(NOT BUILD_CXX)
  OPTION(BUILD_GLOP "Build GLOP standalone" ON)
  message(STATUS "Build standalone Glop: ${BUILD_GLOP}")
endif()

option(BUILD_PYTHON "Build Python Library" OFF)
message(STATUS "Build Python: ${BUILD_PYTHON}")
option(BUILD_JAVA "Build Java Library" OFF)
message(STATUS "Build Java: ${BUILD_JAVA}")
option(BUILD_DOTNET "Build .NET Library" OFF)
message(STATUS "Build .Net: ${BUILD_DOTNET}")

# If wrapper are built, we need to have the install rpath in BINARY_DIR to package
if(BUILD_PYTHON OR BUILD_JAVA OR BUILD_DOTNET)
  set(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
endif()

include(CMakeDependentOption)

# Optional components (enabled by default)
## Flatzinc
CMAKE_DEPENDENT_OPTION(BUILD_FLATZINC "Build flatzinc" ON "BUILD_CXX" OFF)
message(STATUS "Build Flatzinc: ${BUILD_FLATZINC}")

## LP Parser
CMAKE_DEPENDENT_OPTION(BUILD_LP_PARSER "Build lp_parser" ON "BUILD_CXX" OFF)
message(STATUS "Build LP Parser: ${BUILD_LP_PARSER}")

## MathOpt
CMAKE_DEPENDENT_OPTION(BUILD_MATH_OPT "Build the MATH_OPT" ON "BUILD_CXX" OFF)
message(STATUS "Build MathOpt: ${BUILD_MATH_OPT}")

## Samples
option(BUILD_SAMPLES "Build samples" ON)
message(STATUS "Build samples: ${BUILD_SAMPLES}")
CMAKE_DEPENDENT_OPTION(BUILD_CXX_SAMPLES "Build cxx samples" ON "BUILD_SAMPLES;BUILD_CXX" OFF)
message(STATUS "Build C++ samples: ${BUILD_CXX_SAMPLES}")
CMAKE_DEPENDENT_OPTION(BUILD_PYTHON_SAMPLES "Build python samples" ON "BUILD_SAMPLES;BUILD_PYTHON" OFF)
message(STATUS "Build Python samples: ${BUILD_PYTHON_SAMPLES}")
CMAKE_DEPENDENT_OPTION(BUILD_JAVA_SAMPLES "Build java samples" ON "BUILD_SAMPLES;BUILD_JAVA" OFF)
message(STATUS "Build Java samples: ${BUILD_JAVA_SAMPLES}")
CMAKE_DEPENDENT_OPTION(BUILD_DOTNET_SAMPLES "Build dotnet samples" ON "BUILD_SAMPLES;BUILD_DOTNET" OFF)
message(STATUS "Build .Net samples: ${BUILD_DOTNET_SAMPLES}")

## Examples
option(BUILD_EXAMPLES "Build examples" ON)
message(STATUS "Build examples: ${BUILD_EXAMPLES}")
CMAKE_DEPENDENT_OPTION(BUILD_CXX_EXAMPLES "Build cxx examples" ON "BUILD_EXAMPLES;BUILD_CXX" OFF)
message(STATUS "Build C++ examples: ${BUILD_CXX_EXAMPLES}")
CMAKE_DEPENDENT_OPTION(BUILD_PYTHON_EXAMPLES "Build python examples" ON "BUILD_EXAMPLES;BUILD_PYTHON" OFF)
message(STATUS "Build Python examples: ${BUILD_PYTHON_EXAMPLES}")
CMAKE_DEPENDENT_OPTION(BUILD_JAVA_EXAMPLES "Build java examples" ON "BUILD_EXAMPLES;BUILD_JAVA" OFF)
message(STATUS "Build Java examples: ${BUILD_JAVA_EXAMPLES}")
CMAKE_DEPENDENT_OPTION(BUILD_DOTNET_EXAMPLES "Build dotnet examples" ON "BUILD_EXAMPLES;BUILD_DOTNET" OFF)
message(STATUS "Build .Net examples: ${BUILD_DOTNET_EXAMPLES}")

option(BUILD_DOC "Build documentation" OFF)
message(STATUS "Build documentation: ${BUILD_DOC}")
CMAKE_DEPENDENT_OPTION(INSTALL_DOC "Install doc" ON "BUILD_CXX AND BUILD_DOC" OFF)
message(STATUS "Install doc: ${INSTALL_DOC}")

# By default all dependencies are NOT built (i.e. BUILD_DEPS=OFF),
# BUT if building any wrappers (Python, Java or .Net) then BUILD_DEPS=ON.
if(BUILD_PYTHON OR BUILD_JAVA OR BUILD_DOTNET)
  option(BUILD_DEPS "Build all dependencies" ON)
else()
  option(BUILD_DEPS "Build all dependencies" OFF)
endif()
message(STATUS "Build all dependencies: ${BUILD_DEPS}")
# Install built dependencies if any,
option(INSTALL_BUILD_DEPS "Install build all dependencies" ON)

# IF BUILD_DEPS=ON THEN Force all BUILD_*=ON
CMAKE_DEPENDENT_OPTION(BUILD_ZLIB "Build the ZLIB dependency Library" OFF
  "NOT BUILD_DEPS" ON)
message(STATUS "Build ZLIB: ${BUILD_ZLIB}")

CMAKE_DEPENDENT_OPTION(BUILD_absl "Build the abseil-cpp dependency Library" OFF
  "NOT BUILD_DEPS" ON)
message(STATUS "Build abseil-cpp: ${BUILD_absl}")

CMAKE_DEPENDENT_OPTION(BUILD_Protobuf "Build the Protobuf dependency Library" OFF
  "NOT BUILD_DEPS" ON)
message(STATUS "Build protobuf: ${BUILD_Protobuf}")

CMAKE_DEPENDENT_OPTION(BUILD_Eigen3 "Build the eigen3 dependency Library" OFF
  "NOT BUILD_DEPS" ON)
message(STATUS "Build eigen3: ${BUILD_Eigen3}")

if(BUILD_LP_PARSER OR BUILD_TESTING)
  CMAKE_DEPENDENT_OPTION(BUILD_re2 "Build the re2 dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build re2: ${BUILD_re2}")
endif()

if(BUILD_TESTING)
  CMAKE_DEPENDENT_OPTION(BUILD_googletest "Build googletest" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build googletest: ${BUILD_googletest}")

  CMAKE_DEPENDENT_OPTION(BUILD_benchmark "Build benchmark" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build benchmark: ${BUILD_benchmark}")
else()
  set(BUILD_googletest OFF)
  set(BUILD_benchmark OFF)
endif()

# Optional third party solvers (enabled by default)
## BOP
# note OFF is currently not supported.
CMAKE_DEPENDENT_OPTION(USE_BOP "Use the BOP solver" ON "BUILD_CXX" OFF)
message(STATUS "BOP support: ${USE_BOP}")

## COIN-OR Solvers (Cbc, Clp)
CMAKE_DEPENDENT_OPTION(USE_COINOR "Use the COIN-OR solver" ON "BUILD_CXX" OFF)
message(STATUS "COIN-OR support: ${USE_COINOR}")
if(USE_COINOR)
  CMAKE_DEPENDENT_OPTION(BUILD_CoinUtils "Build the CoinUtils dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build CoinUtils: ${BUILD_CoinUtils}")

  CMAKE_DEPENDENT_OPTION(BUILD_Osi "Build the Osi dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build Osi: ${BUILD_Osi}")

  CMAKE_DEPENDENT_OPTION(BUILD_Clp "Build the Clp dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build Clp: ${BUILD_Clp}")

  CMAKE_DEPENDENT_OPTION(BUILD_Cgl "Build the Cgl dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build Cgl: ${BUILD_Cgl}")

  CMAKE_DEPENDENT_OPTION(BUILD_Cbc "Build the Cbc dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build Cbc: ${BUILD_Cbc}")
endif()

## GLOP
# note OFF is currently not supported.
CMAKE_DEPENDENT_OPTION(USE_GLOP "Use the GLOP solver" ON "BUILD_CXX" OFF)
message(STATUS "GLOP support: ${USE_GLOP}")

## GLPK
# Disable by default since it is GPLv3, user could enable it and release under GPLv3
# see: https://www.apache.org/licenses/GPL-compatibility.html
CMAKE_DEPENDENT_OPTION(USE_GLPK "Use the GLPK solver" OFF "BUILD_CXX" OFF)
message(STATUS "GLPK support: ${USE_GLPK}")
if(USE_GLPK)
  CMAKE_DEPENDENT_OPTION(BUILD_GLPK "Build the GLPK dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build GLPK: ${BUILD_GLPK}")
endif()

## GUROBI
# Since it is dynamicaly loaded upon use, OFF is currently not supported.
CMAKE_DEPENDENT_OPTION(USE_GUROBI "Use the Gurobi solver" ON "BUILD_CXX" OFF)
message(STATUS "Gurobi support: ${USE_GUROBI}")

## HiGHS
# see: https://github.com/ERGO-Code/HiGHS
CMAKE_DEPENDENT_OPTION(USE_HIGHS "Use the HiGHS solver" ON "BUILD_CXX" OFF)
message(STATUS "HiGHS support: ${USE_HIGHS}")
if(USE_HIGHS)
  CMAKE_DEPENDENT_OPTION(BUILD_HIGHS "Build the HiGHS dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build HiGHS: ${BUILD_HIGHS}")
endif()

## PDLP
CMAKE_DEPENDENT_OPTION(USE_PDLP "Use the PDLP solver" ON "BUILD_CXX" OFF)
message(STATUS "PDLP support: ${USE_PDLP}")
if(USE_PDLP)
  CMAKE_DEPENDENT_OPTION(BUILD_PDLP "Build the PDLP dependency Library" ON
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build PDLP: ${BUILD_PDLP}")
endif()

## SCIP
# see: https://github.com/scipopt/scip
CMAKE_DEPENDENT_OPTION(USE_SCIP "Use the Scip solver" ON "BUILD_CXX" OFF)
message(STATUS "SCIP support: ${USE_SCIP}")
if(USE_SCIP)
  CMAKE_DEPENDENT_OPTION(BUILD_SCIP "Build the SCIP dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Build SCIP: ${BUILD_SCIP}")
endif()

# Optional third party solvers (disabled by default)
## CPLEX
option(USE_CPLEX "Use the CPLEX solver" OFF)
message(STATUS "CPLEX support: ${USE_CPLEX}")

## XPRESS
# Since it is dynamicaly loaded upon use, OFF is currently not supported.
CMAKE_DEPENDENT_OPTION(USE_XPRESS "Use the Xpress solver" ON "BUILD_CXX" OFF)
message(STATUS "Xpress support: ${USE_XPRESS}")

# Language specific options
if(BUILD_CXX)
  CMAKE_DEPENDENT_OPTION(BUILD_CXX_DOC "Build the C++ doc" OFF "NOT BUILD_DOC" ON)
  message(STATUS "C++: Build doc: ${BUILD_CXX_DOC}")
endif()

if(BUILD_DOTNET)
  option(UNIVERSAL_DOTNET_PACKAGE "Build a .Net multi OS Package" OFF)
  message(STATUS ".Net: Create multiple OS Package: ${UNIVERSAL_DOTNET_PACKAGE}")

  CMAKE_DEPENDENT_OPTION(BUILD_DOTNET_DOC "Build the .Net doc" OFF "NOT BUILD_DOC" ON)
  message(STATUS ".Net: Build doc: ${BUILD_DOTNET_DOC}")

  # Language Version
  # see: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version
  set(DOTNET_LANG "9.0" CACHE STRING "Specify the C# language version (default \"9.0\")")
  message(STATUS ".Net C# language version: ${DOTNET_LANG}")

  set(DOTNET_SAMPLE_LANG "8.0" CACHE STRING "Specify the C# language version for samples (default \"8.0\")")
  message(STATUS ".Net Samples C# language version: ${DOTNET_SAMPLE_LANG}")

  # Targeted Framework Moniker
  # see: https://docs.microsoft.com/en-us/dotnet/standard/frameworks
  # see: https://learn.microsoft.com/en-us/dotnet/standard/net-standard
  option(USE_DOTNET_46 "Use .Net Framework 4.6 support" OFF)
  message(STATUS ".Net: Use .Net Framework 4.6 support: ${USE_DOTNET_46}")
  option(USE_DOTNET_461 "Use .Net Framework 4.6.1 support" OFF)
  message(STATUS ".Net: Use .Net Framework 4.6.1 support: ${USE_DOTNET_461}")
  option(USE_DOTNET_462 "Use .Net Framework 4.6.2 support" OFF)
  message(STATUS ".Net: Use .Net Framework 4.6.2 support: ${USE_DOTNET_462}")

  option(USE_DOTNET_48 "Use .Net Framework 4.8 support" OFF)
  message(STATUS ".Net: Use .Net Framework 4.8 support: ${USE_DOTNET_48}")

  option(USE_DOTNET_STD_21 "Use .Net Standard 2.1 support" OFF)
  message(STATUS ".Net: Use .Net Framework 2.1 support: ${USE_DOTNET_STD_21}")

  # .Net Core 3.1 LTS is not available for osx arm64
  if(APPLE AND CMAKE_SYSTEM_PROCESSOR MATCHES "^(aarch64|arm64)")
    set(USE_DOTNET_CORE_31 OFF)
  else()
    option(USE_DOTNET_CORE_31 "Use .Net Core 3.1 LTS support" OFF)
  endif()
  message(STATUS ".Net: Use .Net Core 3.1 LTS support: ${USE_DOTNET_CORE_31}")

  option(USE_DOTNET_6 "Use .Net 6.0 LTS support" ON)
  message(STATUS ".Net: Use .Net 6.0 LTS support: ${USE_DOTNET_6}")

  option(USE_DOTNET_7 "Use .Net 7.0 support" OFF)
  message(STATUS ".Net: Use .Net 7.0 support: ${USE_DOTNET_7}")
endif()

if(BUILD_JAVA)
  option(BUILD_FAT_JAR "Create single .jar with all dependencies (including native binaries)" OFF)
  message(STATUS "Java: Build single fat .jar: ${BUILD_FAT_JAR}")

  option(SKIP_GPG "Disable GPG sign" ON)
  message(STATUS "Java: Disable gpg:sign: ${SKIP_GPG}")

  option(UNIVERSAL_JAVA_PACKAGE "Build a Java multi OS Package" OFF)
  message(STATUS "Java: Create multiple OS package: ${UNIVERSAL_JAVA_PACKAGE}")

  CMAKE_DEPENDENT_OPTION(BUILD_JAVA_DOC "Build the Java doc" OFF "NOT BUILD_DOC" ON)
  message(STATUS "Java: Build doc: ${BUILD_JAVA_DOC}")

  # On Centos-7 this option (needed otherwise) is unrecognized and should be
  # replaced by an empty string.
  set(GPG_ARGS "<arg>--pinentry-mode</arg><arg>loopback</arg>" CACHE STRING "Extra options for GPG")
  message(STATUS "Java: Add GPG options: ${GPG_ARGS}")
endif()

if(BUILD_PYTHON)
  CMAKE_DEPENDENT_OPTION(BUILD_pybind11 "Build the pybind11 dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Python: Build pybind11: ${BUILD_pybind11}")

  CMAKE_DEPENDENT_OPTION(BUILD_pybind11_protobuf "Build the pybind11_protobuf dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Python: Build pybind11_protobuf: ${BUILD_pybind11_protobuf}")

  CMAKE_DEPENDENT_OPTION(BUILD_pybind11_abseil "Build the pybind11_abseil dependency Library" OFF
    "NOT BUILD_DEPS" ON)
  message(STATUS "Python: Build pybind11_abseil: ${BUILD_pybind11_abseil}")

  option(GENERATE_PYTHON_STUB "Generate Python stub file (.pyi)" ON)
  message(STATUS "Python: Generate stub file: ${GENERATE_PYTHON_STUB}")

CMAKE_DEPENDENT_OPTION(BUILD_PYTHON_DOC "Build the Python doc" OFF "NOT BUILD_DOC" ON)
  message(STATUS "Python: Build doc: ${BUILD_PYTHON_DOC}")

  CMAKE_DEPENDENT_OPTION(BUILD_VENV "Create Python venv in BINARY_DIR/python/venv" OFF
    "NOT BUILD_TESTING" ON)
  message(STATUS "Python: Create venv: ${BUILD_VENV}")

  CMAKE_DEPENDENT_OPTION(VENV_USE_SYSTEM_SITE_PACKAGES "Python venv can use system site packages" OFF
    "BUILD_VENV" OFF)
  message(STATUS "Python: Allow venv to use system site packages: ${VENV_USE_SYSTEM_SITE_PACKAGES}")

  option(FETCH_PYTHON_DEPS "Install python required modules if not available" ${BUILD_DEPS})
  message(STATUS "Python: Fetch dependencies: ${FETCH_PYTHON_DEPS}")
endif()

# Find system deps
include(system_deps)

# Build Needed dependencies
add_subdirectory(cmake/dependencies dependencies)
list(APPEND CMAKE_PREFIX_PATH ${CMAKE_CURRENT_BINARY_DIR}/dependencies/install)

include(host)
# verify deps
include(check_deps)

include(cpp)
include(flatzinc)
include(glop)

include(python)
include(java)
include(dotnet)

# Since samples mix all languages we must parse them once we have included all
# <language>.cmake files
foreach(SAMPLES IN ITEMS
 algorithms
 graph
 glop
 constraint_solver
 linear_solver
 ${MATH_OPT_DIR}
 ${PDLP_DIR}
 sat)
  add_subdirectory(ortools/${SAMPLES}/samples)
endforeach()

# Same for examples
foreach(EXAMPLES IN ITEMS contrib cpp dotnet java python)
  add_subdirectory(examples/${EXAMPLES})
endforeach()

# Add tests in examples/tests
add_subdirectory(examples/tests)