CMakeLists.txt

cmake_minimum_required(VERSION 3.15...3.26)

# --- BEGIN ANDROID CROSS-COMPILATION FIX ---
# Buildozer/python-for-android uses standard pip install which doesn't natively 
# pass a CMake toolchain file to scikit-build-core. This detects the Android compiler 
# from the environment and forces CMake into cross-compilation mode to prevent 
# it from building host (x86_64) binaries.
if("$ENV{CC}" MATCHES "android" AND NOT DEFINED CMAKE_SYSTEM_NAME)
    message(STATUS "Detected Android cross-compilation via environment variables. Setting CMAKE_SYSTEM_NAME=Android")
    set(CMAKE_SYSTEM_NAME Android)
endif()
# --- END ANDROID CROSS-COMPILATION FIX ---

project(${SKBUILD_PROJECT_NAME} LANGUAGES C)
set(CMAKE_POSITION_INDEPENDENT_CODE ON)

# Always make a release build
set(CMAKE_BUILD_TYPE Release)

find_package(
  Python
  COMPONENTS Interpreter Development.Module
  REQUIRED)

# Avoid building tooling we won't need for release
# See all options with `cmake -LA` in an `h3/build` directory,
# or at https://h3geo.org/docs/next/core-library/compilation-options/
macro(turn_off option_name)
    set(${option_name} OFF CACHE BOOL "" FORCE)
endmacro()
turn_off(BUILD_ALLOC_TESTS)
turn_off(BUILD_BENCHMARKS)
turn_off(BUILD_FILTERS)
turn_off(BUILD_FUZZERS)
turn_off(BUILD_GENERATORS)
turn_off(BUILD_TESTING)
turn_off(ENABLE_COVERAGE)
turn_off(ENABLE_DOCS)
turn_off(ENABLE_FORMAT)
turn_off(ENABLE_LIBFUZZER)
turn_off(ENABLE_LINTING)

# Build the core library as static
set(BUILD_SHARED_LIBS OFF)
add_subdirectory(src/h3lib)

# Build the rest (other than the core library dependency) as shared
set(BUILD_SHARED_LIBS ON)
add_subdirectory(src/h3)

# Include built h3api.h for Cython API
install(
    FILES
        "${CMAKE_CURRENT_BINARY_DIR}/src/h3lib/src/h3lib/include/h3api.h"
    DESTINATION
        ${SKBUILD_PROJECT_NAME}/_cy)