CMakeLists.txt

cmake_minimum_required(VERSION 3.12)

project(s2-geometry
	VERSION 0.10.0)

include(CMakeDependentOption)
include(CheckCXXCompilerFlag)
include(FeatureSummary)
include(FindPackageHandleStandardArgs)
include(GNUInstallDirs)

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
# Avoid "Policy CMP0042 is not set" warning on macOS.
if (APPLE)
    set(CMAKE_MACOSX_RPATH TRUE)
endif()

# s2geometry needs to use the same C++ standard that absl used to avoid
# undefined symbol errors since ABSL_HAVE_STD_STRING_VIEW etc will
# end up defined differently.  There is probably a better way to achieve
# this than assuming what absl used.  s2geometry should actually work fine
# with C++11, but there are a few places that use std::exchange instead of
# absl::exchange, is_x_t, and some atomic constructors that would need
# to change.  File a bug if you need support for earlier versions.
# TODO(jrosenstock,b/205952836): Use absl functions if possible.
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# No compiler-specific extensions, i.e. -std=c++17, not -std=gnu++17.
set(CMAKE_CXX_EXTENSIONS OFF)

list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/third_party/cmake")

option(WITH_GFLAGS "Use gflags to change command line flags." OFF)
add_feature_info(GFLAGS WITH_GFLAGS
                 "allows changing command line flags.")

# glog option can only be turned on if gflags is on.
cmake_dependent_option(WITH_GLOG "Use glog for logging." ON
                       "WITH_GFLAGS" OFF)
add_feature_info(GLOG WITH_GLOG "provides logging configurability.")

option(BUILD_SHARED_LIBS "Build shared libraries instead of static." ON)
add_feature_info(SHARED_LIBS BUILD_SHARED_LIBS
                 "builds shared libraries instead of static.")

option(BUILD_EXAMPLES "Build s2 documentation examples." ON)

option(WITH_PYTHON "Add python interface" OFF)
add_feature_info(PYTHON WITH_PYTHON "provides python interface to S2")

feature_summary(WHAT ALL)

if (WITH_GLOG)
    find_package(Glog REQUIRED)
    # FindGFlags.cmake and FindGlog.cmake do not seem to implement REQUIRED;
    # check manually.
    if (NOT ${GLOG_FOUND})
        message(FATAL_ERROR "Glog requested but not found")
    endif()
    add_definitions(-DS2_USE_GLOG)
else()
    # Don't output anything for LOG(INFO).
    add_definitions(-DABSL_MIN_LOG_LEVEL=1)
endif()

if (WITH_GFLAGS)
    find_package(GFlags REQUIRED)
    if (NOT ${GFLAGS_FOUND})
        message(FATAL_ERROR "GFlags requested but not found")
    endif()
    add_definitions(-DS2_USE_GFLAGS)
endif()

find_package(absl REQUIRED)
find_package(OpenSSL REQUIRED)
# pthreads isn't used directly, but this is still required for std::thread.
find_package(Threads REQUIRED)

if (WITH_PYTHON)
    # Should be easy to make it work with swig3, but some args to %pythonprepend
    # seem to be different and were changed.
    find_package(SWIG 4.0)
    # Use Python3_ROOT_DIR to help find python3, if the correct location is not
    # being found by default.
    find_package(Python3 COMPONENTS Interpreter Development)
endif()

if (WIN32)
    # Use unsigned characters
    add_definitions(-J)
    # Make sure cmath header defines things like M_PI
    add_definitions(-D_USE_MATH_DEFINES)
    # Make sure Windows doesn't define min/max macros that interfere with STL
    add_definitions(-DNOMINMAX)
else()
    # Avoid megabytes of warnings like:
    # util/math/vector.h:178:16: warning: optimization attribute on
    # ‘double sqrt(double)’ follows definition but the attribute doesn’t
    # match [-Wattributes]
    add_definitions(-Wno-attributes)
    add_definitions(-Wno-deprecated-declarations)
endif()

# If OpenSSL is installed in a non-standard location, configure with
# something like:
# OPENSSL_ROOT_DIR=/usr/local/opt/openssl cmake ..
include_directories(
    ${GFLAGS_INCLUDE_DIRS} ${GLOG_INCLUDE_DIRS} ${OPENSSL_INCLUDE_DIR})

if (WITH_PYTHON)
    include_directories(${Python3_INCLUDE_DIRS})
endif()

include_directories(src)

add_library(s2
            src/s2/encoded_s2cell_id_vector.cc
            src/s2/encoded_s2point_vector.cc
            src/s2/encoded_s2shape_index.cc
            src/s2/encoded_string_vector.cc
            src/s2/id_set_lexicon.cc
            src/s2/mutable_s2shape_index.cc
            src/s2/r2rect.cc
            src/s2/s1angle.cc
            src/s2/s1chord_angle.cc
            src/s2/s1interval.cc
            src/s2/s2boolean_operation.cc
            src/s2/s2buffer_operation.cc
            src/s2/s2builder.cc
            src/s2/s2builder_graph.cc
            src/s2/s2builderutil_closed_set_normalizer.cc
            src/s2/s2builderutil_find_polygon_degeneracies.cc
            src/s2/s2builderutil_get_snapped_winding_delta.cc
            src/s2/s2builderutil_lax_polygon_layer.cc
            src/s2/s2builderutil_lax_polyline_layer.cc
            src/s2/s2builderutil_s2point_vector_layer.cc
            src/s2/s2builderutil_s2polygon_layer.cc
            src/s2/s2builderutil_s2polyline_layer.cc
            src/s2/s2builderutil_s2polyline_vector_layer.cc
            src/s2/s2builderutil_snap_functions.cc
            src/s2/s2cap.cc
            src/s2/s2cell.cc
            src/s2/s2cell_id.cc
            src/s2/s2cell_index.cc
            src/s2/s2cell_union.cc
            src/s2/s2centroids.cc
            src/s2/s2closest_cell_query.cc
            src/s2/s2closest_edge_query.cc
            src/s2/s2closest_point_query.cc
            src/s2/s2contains_vertex_query.cc
            src/s2/s2convex_hull_query.cc
            src/s2/s2coords.cc
            src/s2/s2crossing_edge_query.cc
            src/s2/s2debug.cc
            src/s2/s2earth.cc
            src/s2/s2edge_clipping.cc
            src/s2/s2edge_crosser.cc
            src/s2/s2edge_crossings.cc
            src/s2/s2edge_distances.cc
            src/s2/s2edge_tessellator.cc
            src/s2/s2furthest_edge_query.cc
            src/s2/s2latlng.cc
            src/s2/s2latlng_rect.cc
            src/s2/s2latlng_rect_bounder.cc
            src/s2/s2lax_loop_shape.cc
            src/s2/s2lax_polygon_shape.cc
            src/s2/s2lax_polyline_shape.cc
            src/s2/s2loop.cc
            src/s2/s2loop_measures.cc
            src/s2/s2measures.cc
            src/s2/s2memory_tracker.cc
            src/s2/s2metrics.cc
            src/s2/s2max_distance_targets.cc
            src/s2/s2min_distance_targets.cc
            src/s2/s2padded_cell.cc
            src/s2/s2point_compression.cc
            src/s2/s2point_region.cc
            src/s2/s2pointutil.cc
            src/s2/s2polygon.cc
            src/s2/s2polyline.cc
            src/s2/s2polyline_alignment.cc
            src/s2/s2polyline_measures.cc
            src/s2/s2polyline_simplifier.cc
            src/s2/s2predicates.cc
            src/s2/s2projections.cc
            src/s2/s2r2rect.cc
            src/s2/s2region.cc
            src/s2/s2region_term_indexer.cc
            src/s2/s2region_coverer.cc
            src/s2/s2region_intersection.cc
            src/s2/s2region_union.cc
            src/s2/s2shape_index.cc
            src/s2/s2shape_index_buffered_region.cc
            src/s2/s2shape_index_measures.cc
            src/s2/s2shape_measures.cc
            src/s2/s2shapeutil_build_polygon_boundaries.cc
            src/s2/s2shapeutil_coding.cc
            src/s2/s2shapeutil_contains_brute_force.cc
            src/s2/s2shapeutil_conversion.cc
            src/s2/s2shapeutil_edge_iterator.cc
            src/s2/s2shapeutil_get_reference_point.cc
            src/s2/s2shapeutil_range_iterator.cc
            src/s2/s2shapeutil_visit_crossing_edge_pairs.cc
            src/s2/s2text_format.cc
            src/s2/s2wedge_relations.cc
            src/s2/s2winding_operation.cc
            src/s2/strings/serialize.cc
            src/s2/util/bits/bit-interleave.cc
            src/s2/util/bits/bits.cc
            src/s2/util/coding/coder.cc
            src/s2/util/coding/varint.cc
            src/s2/util/math/exactfloat/exactfloat.cc
            src/s2/util/math/mathutil.cc
            src/s2/util/units/length-units.cc)
add_library(s2testing STATIC
            src/s2/s2builderutil_testing.cc
            src/s2/s2shapeutil_testing.cc
            src/s2/s2testing.cc
            src/s2/thread_testing.cc)
target_link_libraries(
    s2
    ${GFLAGS_LIBRARIES} ${GLOG_LIBRARIES} ${OPENSSL_LIBRARIES}
    absl::base
    absl::btree
    absl::config
    absl::core_headers
    absl::dynamic_annotations
    absl::endian
    absl::fixed_array
    absl::flat_hash_map
    absl::flat_hash_set
    absl::hash
    absl::inlined_vector
    absl::int128
    absl::log_severity
    absl::memory
    absl::span
    absl::str_format
    absl::strings
    absl::type_traits
    absl::utility
    ${CMAKE_THREAD_LIBS_INIT})
target_link_libraries(
    s2testing
    ${GFLAGS_LIBRARIES} ${GLOG_LIBRARIES}
    absl::memory
    absl::strings)

# Allow other CMake projects to use this one with:
# list(APPEND CMAKE_MODULE_PATH "<path_to_s2geometry_dir>/third_party/cmake")
# add_subdirectory(<path_to_s2geometry_dir> s2geometry)
# target_link_libraries(<target_name> s2)
target_include_directories(s2 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/src)

# Add version information to the target
set_target_properties(s2 PROPERTIES
    SOVERSION ${PROJECT_VERSION_MAJOR}
    VERSION ${PROJECT_VERSION})

# We don't need to install all headers, only those
# transitively included by s2 headers we are exporting.
install(FILES src/s2/_fp_contract_off.h
              src/s2/encoded_s2cell_id_vector.h
              src/s2/encoded_s2point_vector.h
              src/s2/encoded_s2shape_index.h
              src/s2/encoded_string_vector.h
              src/s2/encoded_uint_vector.h
              src/s2/id_set_lexicon.h
              src/s2/mutable_s2shape_index.h
              src/s2/r1interval.h
              src/s2/r2.h
              src/s2/r2rect.h
              src/s2/s1angle.h
              src/s2/s1chord_angle.h
              src/s2/s1interval.h
              src/s2/s2boolean_operation.h
              src/s2/s2buffer_operation.h
              src/s2/s2builder.h
              src/s2/s2builder_graph.h
              src/s2/s2builder_layer.h
              src/s2/s2builderutil_closed_set_normalizer.h
              src/s2/s2builderutil_find_polygon_degeneracies.h
              src/s2/s2builderutil_get_snapped_winding_delta.h
              src/s2/s2builderutil_graph_shape.h
              src/s2/s2builderutil_lax_polygon_layer.h
              src/s2/s2builderutil_lax_polyline_layer.h
              src/s2/s2builderutil_s2point_vector_layer.h
              src/s2/s2builderutil_s2polygon_layer.h
              src/s2/s2builderutil_s2polyline_layer.h
              src/s2/s2builderutil_s2polyline_vector_layer.h
              src/s2/s2builderutil_snap_functions.h
              src/s2/s2builderutil_testing.h
              src/s2/s2cap.h
              src/s2/s2cell.h
              src/s2/s2cell_id.h
              src/s2/s2cell_index.h
              src/s2/s2cell_union.h
              src/s2/s2centroids.h
              src/s2/s2closest_cell_query.h
              src/s2/s2closest_cell_query_base.h
              src/s2/s2closest_edge_query.h
              src/s2/s2closest_edge_query_base.h
              src/s2/s2closest_point_query.h
              src/s2/s2closest_point_query_base.h
              src/s2/s2contains_point_query.h
              src/s2/s2contains_vertex_query.h
              src/s2/s2convex_hull_query.h
              src/s2/s2coords_internal.h
              src/s2/s2coords.h
              src/s2/s2crossing_edge_query.h
              src/s2/s2debug.h
              src/s2/s2distance_target.h
              src/s2/s2earth.h
              src/s2/s2edge_clipping.h
              src/s2/s2edge_crosser.h
              src/s2/s2edge_crossings.h
              src/s2/s2edge_crossings_internal.h
              src/s2/s2edge_distances.h
              src/s2/s2edge_tessellator.h
              src/s2/s2edge_vector_shape.h
              src/s2/s2error.h
              src/s2/s2furthest_edge_query.h
              src/s2/s2latlng.h
              src/s2/s2latlng_rect.h
              src/s2/s2latlng_rect_bounder.h
              src/s2/s2lax_loop_shape.h
              src/s2/s2lax_polygon_shape.h
              src/s2/s2lax_polyline_shape.h
              src/s2/s2loop.h
              src/s2/s2loop_measures.h
              src/s2/s2measures.h
              src/s2/s2memory_tracker.h
              src/s2/s2metrics.h
              src/s2/s2max_distance_targets.h
              src/s2/s2min_distance_targets.h
              src/s2/s2padded_cell.h
              src/s2/s2point.h
              src/s2/s2point_vector_shape.h
              src/s2/s2point_compression.h
              src/s2/s2point_index.h
              src/s2/s2point_region.h
              src/s2/s2point_span.h
              src/s2/s2pointutil.h
              src/s2/s2polygon.h
              src/s2/s2polyline.h
              src/s2/s2polyline_alignment.h
              src/s2/s2polyline_measures.h
              src/s2/s2polyline_simplifier.h
              src/s2/s2predicates.h
              src/s2/s2predicates_internal.h
              src/s2/s2projections.h
              src/s2/s2r2rect.h
              src/s2/s2region.h
              src/s2/s2region_term_indexer.h
              src/s2/s2region_coverer.h
              src/s2/s2region_intersection.h
              src/s2/s2region_union.h
              src/s2/s2shape.h
              src/s2/s2shape_index.h
              src/s2/s2shape_index_buffered_region.h
              src/s2/s2shape_index_region.h
              src/s2/s2shape_measures.h
              src/s2/s2shapeutil_build_polygon_boundaries.h
              src/s2/s2shapeutil_coding.h
              src/s2/s2shapeutil_contains_brute_force.h
              src/s2/s2shapeutil_conversion.h
              src/s2/s2shapeutil_count_edges.h
              src/s2/s2shapeutil_edge_iterator.h
              src/s2/s2shapeutil_get_reference_point.h
              src/s2/s2shapeutil_range_iterator.h
              src/s2/s2shapeutil_shape_edge.h
              src/s2/s2shapeutil_shape_edge_id.h
              src/s2/s2shapeutil_testing.h
              src/s2/s2shapeutil_visit_crossing_edge_pairs.h
              src/s2/s2testing.h
              src/s2/s2text_format.h
              src/s2/s2wedge_relations.h
              src/s2/s2winding_operation.h
              src/s2/s2wrapped_shape.h
              src/s2/sequence_lexicon.h
              src/s2/thread_testing.h
              src/s2/value_lexicon.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2")
install(FILES src/s2/base/casts.h
              src/s2/base/commandlineflags.h
              src/s2/base/integral_types.h
              src/s2/base/log_severity.h
              src/s2/base/logging.h
              src/s2/base/port.h
              src/s2/base/spinlock.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/base")
install(FILES src/s2/util/bits/bits.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/util/bits")
install(FILES src/s2/util/coding/coder.h
              src/s2/util/coding/varint.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/util/coding")
install(FILES src/s2/util/endian/endian.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/util/endian")
install(FILES src/s2/util/gtl/compact_array.h
              src/s2/util/gtl/container_logging.h
              src/s2/util/gtl/dense_hash_set.h
              src/s2/util/gtl/densehashtable.h
              src/s2/util/gtl/hashtable_common.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/util/gtl")
install(FILES src/s2/util/hash/mix.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/util/hash")
install(FILES src/s2/util/math/mathutil.h
              src/s2/util/math/matrix3x3.h
              src/s2/util/math/vector.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/util/math")
install(FILES src/s2/util/math/exactfloat/exactfloat.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/util/math/exactfloat")
install(FILES src/s2/util/units/length-units.h
              src/s2/util/units/physical-units.h
        DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/s2/util/units")
install(TARGETS s2 s2testing
        RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}"
        ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
        LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}")

message("GTEST_ROOT: ${GTEST_ROOT}")
if (GTEST_ROOT)
  add_subdirectory(${GTEST_ROOT} build_gtest)
  include_directories(${GTEST_ROOT}/include)

  set(S2TestFiles
      src/s2/encoded_s2cell_id_vector_test.cc
      src/s2/encoded_s2point_vector_test.cc
      src/s2/encoded_s2shape_index_test.cc
      src/s2/encoded_string_vector_test.cc
      src/s2/encoded_uint_vector_test.cc
      src/s2/id_set_lexicon_test.cc
      src/s2/mutable_s2shape_index_test.cc
      src/s2/r1interval_test.cc
      src/s2/r2rect_test.cc
      src/s2/s1angle_test.cc
      src/s2/s1chord_angle_test.cc
      src/s2/s1interval_test.cc
      src/s2/s2boolean_operation_test.cc
      src/s2/s2buffer_operation_test.cc
      src/s2/s2builder_graph_test.cc
      src/s2/s2builder_test.cc
      src/s2/s2builderutil_closed_set_normalizer_test.cc
      src/s2/s2builderutil_find_polygon_degeneracies_test.cc
      src/s2/s2builderutil_get_snapped_winding_delta_test.cc
      src/s2/s2builderutil_lax_polygon_layer_test.cc
      src/s2/s2builderutil_lax_polyline_layer_test.cc
      src/s2/s2builderutil_s2point_vector_layer_test.cc
      src/s2/s2builderutil_s2polygon_layer_test.cc
      src/s2/s2builderutil_s2polyline_layer_test.cc
      src/s2/s2builderutil_s2polyline_vector_layer_test.cc
      src/s2/s2builderutil_snap_functions_test.cc
      src/s2/s2builderutil_testing_test.cc
      src/s2/s2cap_test.cc
      src/s2/s2cell_test.cc
      src/s2/s2cell_id_test.cc
      src/s2/s2cell_index_test.cc
      src/s2/s2cell_union_test.cc
      src/s2/s2centroids_test.cc
      src/s2/s2closest_cell_query_base_test.cc
      src/s2/s2closest_cell_query_test.cc
      src/s2/s2closest_edge_query_base_test.cc
      src/s2/s2closest_edge_query_test.cc
      src/s2/s2closest_point_query_base_test.cc
      src/s2/s2closest_point_query_test.cc
      src/s2/s2contains_point_query_test.cc
      src/s2/s2contains_vertex_query_test.cc
      src/s2/s2convex_hull_query_test.cc
      src/s2/s2coords_test.cc
      src/s2/s2crossing_edge_query_test.cc
      src/s2/s2earth_test.cc
      src/s2/s2edge_clipping_test.cc
      src/s2/s2edge_crosser_test.cc
      src/s2/s2edge_crossings_test.cc
      src/s2/s2edge_distances_test.cc
      src/s2/s2edge_tessellator_test.cc
      src/s2/s2edge_vector_shape_test.cc
      src/s2/s2error_test.cc
      src/s2/s2furthest_edge_query_test.cc
      src/s2/s2latlng_test.cc
      src/s2/s2latlng_rect_bounder_test.cc
      src/s2/s2latlng_rect_test.cc
      src/s2/s2lax_loop_shape_test.cc
      src/s2/s2lax_polygon_shape_test.cc
      src/s2/s2lax_polyline_shape_test.cc
      src/s2/s2loop_measures_test.cc
      src/s2/s2loop_test.cc
      src/s2/s2measures_test.cc
      src/s2/s2memory_tracker_test.cc
      src/s2/s2metrics_test.cc
      src/s2/s2max_distance_targets_test.cc
      src/s2/s2min_distance_targets_test.cc
      src/s2/s2padded_cell_test.cc
      src/s2/s2point_test.cc
      src/s2/s2point_vector_shape_test.cc
      src/s2/s2point_compression_test.cc
      src/s2/s2point_index_test.cc
      src/s2/s2point_region_test.cc
      src/s2/s2pointutil_test.cc
      src/s2/s2polygon_test.cc
      src/s2/s2polyline_alignment_test.cc
      src/s2/s2polyline_simplifier_test.cc
      src/s2/s2polyline_measures_test.cc
      src/s2/s2polyline_test.cc
      src/s2/s2predicates_test.cc
      src/s2/s2projections_test.cc
      src/s2/s2r2rect_test.cc
      src/s2/s2region_test.cc
      src/s2/s2region_term_indexer_test.cc
      src/s2/s2region_coverer_test.cc
      src/s2/s2region_union_test.cc
      src/s2/s2shape_index_buffered_region_test.cc
      src/s2/s2shape_index_measures_test.cc
      src/s2/s2shape_index_region_test.cc
      src/s2/s2shape_index_test.cc
      src/s2/s2shape_measures_test.cc
      src/s2/s2shapeutil_build_polygon_boundaries_test.cc
      src/s2/s2shapeutil_coding_test.cc
      src/s2/s2shapeutil_contains_brute_force_test.cc
      src/s2/s2shapeutil_conversion_test.cc
      src/s2/s2shapeutil_count_edges_test.cc
      src/s2/s2shapeutil_edge_iterator_test.cc
      src/s2/s2shapeutil_get_reference_point_test.cc
      src/s2/s2shapeutil_range_iterator_test.cc
      src/s2/s2shapeutil_visit_crossing_edge_pairs_test.cc
      src/s2/s2testing_test.cc
      src/s2/s2text_format_test.cc
      src/s2/s2wedge_relations_test.cc
      src/s2/s2winding_operation_test.cc
      src/s2/s2wrapped_shape_test.cc
      src/s2/sequence_lexicon_test.cc
      src/s2/value_lexicon_test.cc)

  enable_testing()

  foreach (test_cc ${S2TestFiles})
    get_filename_component(test ${test_cc} NAME_WE)
    add_executable(${test} ${test_cc})
    target_link_libraries(
        ${test}
        s2testing s2
        absl::base
        absl::btree
        absl::core_headers
        absl::flags_reflection
        absl::memory
        absl::span
        absl::strings
        absl::synchronization
        gtest_main)
    add_test(${test} ${test})
  endforeach()
endif()

if (BUILD_EXAMPLES)
  add_subdirectory("doc/examples" examples)
endif()

if (${SWIG_FOUND} AND ${Python3_FOUND})
  add_subdirectory("src/python" python)
endif()