# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# 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.

cmake_minimum_required(VERSION 3.0.2 FATAL_ERROR)
# We use the GoogleTest module if it is available (only in CMake 3.9+)
# It requires CMP0054 and CMP0057 to be enabled.
if (POLICY CMP0054)
  cmake_policy(SET CMP0054 NEW)
endif()
if (POLICY CMP0057)
  cmake_policy(SET CMP0057 NEW)
endif()

# CMP0075 Include file check macros honor CMAKE_REQUIRED_LIBRARIES
if(POLICY CMP0075)
  cmake_policy(SET CMP0075 NEW)
endif()

# includes
set(CMAKE_MODULE_PATH
  "${CMAKE_CURRENT_SOURCE_DIR}/CMake"
  # for in-fbsource builds
  "${CMAKE_CURRENT_SOURCE_DIR}/../opensource/fbcode_builder/CMake"
  # For shipit-transformed builds
  "${CMAKE_CURRENT_SOURCE_DIR}/build/fbcode_builder/CMake"
  ${CMAKE_MODULE_PATH})

# package information
set(PACKAGE_NAME      "folly")
if (NOT DEFINED PACKAGE_VERSION)
  set(PACKAGE_VERSION   "0.58.0-dev")
endif()
set(PACKAGE_STRING    "${PACKAGE_NAME} ${PACKAGE_VERSION}")
set(PACKAGE_TARNAME   "${PACKAGE_NAME}-${PACKAGE_VERSION}")
set(PACKAGE_BUGREPORT "https://github.com/facebook/folly/issues")

# 150+ tests in the root folder anyone? No? I didn't think so.
set_property(GLOBAL PROPERTY USE_FOLDERS ON)

project(${PACKAGE_NAME} CXX C ASM)

set(INCLUDE_INSTALL_DIR include CACHE STRING
    "The subdirectory where header files should be installed")
set(LIB_INSTALL_DIR lib CACHE STRING
    "The subdirectory where libraries should be installed")
set(BIN_INSTALL_DIR bin CACHE STRING
    "The subdirectory where binaries should be installed")
set(CMAKE_INSTALL_DIR lib/cmake/folly CACHE STRING
    "The subdirectory where CMake package config files should be installed")

option(BUILD_SHARED_LIBS
  "If enabled, build folly as a shared library.  \
  This is generally discouraged, since folly does not commit to having \
  a stable ABI."
  OFF
)
# Mark BUILD_SHARED_LIBS as an "advanced" option, since enabling it
# is generally discouraged.
mark_as_advanced(BUILD_SHARED_LIBS)
set(FOLLY_SUPPORT_SHARED_LIBRARY "${BUILD_SHARED_LIBS}")

include(FBBuildOptions)
fb_activate_static_library_option()

if(NOT CMAKE_CXX_STANDARD)
  set(CMAKE_CXX_STANDARD 17)
  set(CMAKE_CXX_STANDARD_REQUIRED ON)
  message(STATUS "setting C++ standard to C++${CMAKE_CXX_STANDARD}")
endif()

if(NOT DEFINED IS_X86_64_ARCH AND ${CMAKE_SYSTEM_PROCESSOR} MATCHES "x86_64|AMD64")
  set(IS_X86_64_ARCH TRUE)
else()
  set(IS_X86_64_ARCH FALSE)
endif()

if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
  # Check target architecture
  if (NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
    message(FATAL_ERROR "Folly requires a 64bit target architecture.")
  endif()

  if (MSVC_VERSION LESS 1900)
    message(
      FATAL_ERROR
      "This build script only supports building Folly on 64-bit Windows with "
      "at least Visual Studio 2017. "
      "MSVC version '${MSVC_VERSION}' is not supported."
    )
  endif()
endif()

set(TOP_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
set(FOLLY_DIR "${CMAKE_CURRENT_SOURCE_DIR}/folly")
set(
  FOLLY_DIR_PREFIXES
  "${CMAKE_CURRENT_SOURCE_DIR}:${CMAKE_CURRENT_BINARY_DIR}"
)

include(GNUInstallDirs)

set(CMAKE_THREAD_PREFER_PTHREAD ON)
set(THREADS_PREFER_PTHREAD_FLAG ON)
find_package(Threads REQUIRED)
set(FOLLY_HAVE_PTHREAD "${CMAKE_USE_PTHREADS_INIT}")
list(APPEND CMAKE_REQUIRED_LIBRARIES Threads::Threads)
list(APPEND FOLLY_LINK_LIBRARIES Threads::Threads)

if(MSVC)
  include(FollyCompilerMSVC)
else()
  include(FollyCompilerUnix)
endif()
include(FollyFunctions)

include(folly-deps) # Find the required packages
include(FollyConfigChecks)
configure_file(
  ${CMAKE_CURRENT_SOURCE_DIR}/CMake/folly-config.h.cmake
  ${CMAKE_CURRENT_BINARY_DIR}/folly/folly-config.h
)