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h3

3.4.6-a
3.7.2-b 3.7.2-a 3.6.4 3.6.3 3.4.6-a 3.1.1 3.1.0 3.0.1 3.0.0

An OTP library

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h3 c_src cmake FindH3.cmake
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c_src/cmake/FindH3.cmake 

include(ExternalProject)



# Hack to let us declare a not-yet-existing include path below.

file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/include/h3)



# get an uppercase version of the build type, for extracting build_type specific flags

if(CMAKE_BUILD_TYPE)

  string(TOUPPER ${CMAKE_BUILD_TYPE} BUILD_TYPE_UC)

endif()



# Use this repo's semantic version as the tag to fetch from up

# upstream uber/h3

find_package(Git REQUIRED)

execute_process(COMMAND

  ${GIT_EXECUTABLE} describe --tags

  WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}

  RESULT_VARIABLE GIT_SUCCESS

  OUTPUT_VARIABLE ERLANG_H3_TAG

  )

if(NOT GIT_SUCCESS EQUAL "0")

  message(WARNING "could not get erlang-h3 tag, falling back on hard-coded version")

  set(ERLANG_H3_TAG "v3.6.4")

endif()

string(REGEX REPLACE "\n$" "" ERLANG_H3_TAG "${ERLANG_H3_TAG}")

string(REGEX MATCH "^v[0-9]+\.[0-9]+\.[0-9]+" UPSTREAM_H3_GIT_TAG "${ERLANG_H3_TAG}")

message(STATUS "Using upstream h3 tag ${UPSTREAM_H3_GIT_TAG} based on local tag ${ERLANG_H3_TAG}")



ExternalProject_Add(external-h3

  PREFIX            ${CMAKE_CURRENT_BINARY_DIR}/external-h3

  GIT_REPOSITORY    http://github.com/uber/h3.git

  GIT_TAG           ${UPSTREAM_H3_GIT_TAG}

  BUILD_IN_SOURCE   0

  CMAKE_ARGS        -DBUILD_BENCHMARKS=OFF

                    -DBUILD_FILTERS=OFF

                    -DBUILD_GENERATORS=OFF

                    -DBUILD_TESTING=OFF

                    -DENABLE_COVERAGE=OFF

                    -DENABLE_COVERAGE=OFF

                    -DENABLE_DOCS=OFF

                    -DENABLE_FORMAT=OFF

                    -DENABLE_LINTING=OFF

                    -DCMAKE_POSITION_INDEPENDENT_CODE=ON

                    -DCMAKE_INSTALL_PREFIX=${CMAKE_CURRENT_BINARY_DIR}

                    -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS_${BUILD_TYPE_UC}}

                    -DCMAKE_EXE_LINKER_FLAGS=${CMAKE_EXE_LINKER_FLAGS_${BUILD_TYPE_UC}}

                    -DCMAKE_TOOLCHAIN_FILE=$ENV{CMAKE_TOOLCHAIN_FILE}

                    -DH3_ALLOC_PREFIX=libh3_

                    )



add_library(H3::H3 STATIC IMPORTED)

set_target_properties(H3::H3

  PROPERTIES

  IMPORTED_LOCATION             ${CMAKE_CURRENT_BINARY_DIR}/lib/libh3.a

  INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_CURRENT_BINARY_DIR}/include/h3

  )

add_dependencies(H3::H3 external-h3)