CMakeLists.txt

# CMAKE REFERENCE
#   intro: https://codingnest.com/basic-cmake/
#   best practices (3.0+): https://gist.github.com/mbinna/c61dbb39bca0e4fb7d1f73b0d66a4fd1
#   pitfalls: https://izzys.casa/2019/02/everything-you-never-wanted-to-know-about-cmake/

# Version should match the tested CMAKE_URL in .github/workflows/ci.yml.
cmake_minimum_required(VERSION 3.10)

# Can be removed once minimum version is at least 3.15
if(POLICY CMP0092)
  cmake_policy(SET CMP0092 NEW)
endif()

project(nvim C)

if(POLICY CMP0075)
  cmake_policy(SET CMP0075 NEW)
endif()

# Point CMake at any custom modules we may ship
list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake")

# We don't support building in-tree.
include(PreventInTreeBuilds)
include(Util)

set(TOUCHES_DIR ${PROJECT_BINARY_DIR}/touches)

set_property(GLOBAL PROPERTY USE_FOLDERS ON)

# Prefer our bundled versions of dependencies.
if(DEFINED ENV{DEPS_BUILD_DIR})
  if(CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
    # pkg-config 29.2 has a bug on OpenBSD which causes it to drop any paths that
    # *contain* system include paths. To avoid this, we prefix what would be
    # "/usr/include" as "/_usr/include".
    # This check is also performed in the cmake.deps/CMakeLists.txt and in the
    # else clause following here.
    # https://github.com/neovim/neovim/pull/14745#issuecomment-860201794
    set(DEPS_PREFIX "$ENV{DEPS_BUILD_DIR}/_usr" CACHE PATH "Path prefix for finding dependencies")
  else()
    set(DEPS_PREFIX "$ENV{DEPS_BUILD_DIR}/usr" CACHE PATH "Path prefix for finding dependencies")
  endif()
else()
  if(CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
    set(DEPS_PREFIX "${CMAKE_CURRENT_SOURCE_DIR}/.deps/_usr" CACHE PATH "Path prefix for finding dependencies")
  else()
    set(DEPS_PREFIX "${CMAKE_CURRENT_SOURCE_DIR}/.deps/usr" CACHE PATH "Path prefix for finding dependencies")
  endif()
  # When running from within CLion or Visual Studio,
  # build bundled dependencies automatically.
  if(NOT EXISTS ${DEPS_PREFIX}
     AND (DEFINED ENV{CLION_IDE}
          OR DEFINED ENV{VisualStudioEdition}))
    message(STATUS "Building dependencies...")
    set(DEPS_BUILD_DIR ${PROJECT_BINARY_DIR}/.deps)
    file(MAKE_DIRECTORY ${DEPS_BUILD_DIR})
    execute_process(
      COMMAND ${CMAKE_COMMAND} -G ${CMAKE_GENERATOR}
        -DCMAKE_TOOLCHAIN_FILE=${CMAKE_TOOLCHAIN_FILE}
        -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
        -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
        -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
        -DCMAKE_C_FLAGS_DEBUG=${CMAKE_C_FLAGS_DEBUG}
        -DCMAKE_C_FLAGS_MINSIZEREL=${CMAKE_C_FLAGS_MINSIZEREL}
        -DCMAKE_C_FLAGS_RELWITHDEBINFO=${CMAKE_C_FLAGS_RELWITHDEBINFO}
        -DCMAKE_C_FLAGS_RELEASE=${CMAKE_C_FLAGS_RELEASE}
        -DCMAKE_MAKE_PROGRAM=${CMAKE_MAKE_PROGRAM}
        ${PROJECT_SOURCE_DIR}/cmake.deps
      WORKING_DIRECTORY ${DEPS_BUILD_DIR})
    execute_process(
      COMMAND ${CMAKE_COMMAND} --build ${DEPS_BUILD_DIR}
        --config ${CMAKE_BUILD_TYPE})
    set(DEPS_PREFIX ${DEPS_BUILD_DIR}/usr)
  endif()
endif()

list(INSERT CMAKE_PREFIX_PATH 0 ${DEPS_PREFIX})
set(ENV{PKG_CONFIG_PATH} "$ENV{PKG_CONFIG_PATH}:${DEPS_PREFIX}/lib/pkgconfig")

# used for check_c_compiler_flag
include(CheckCCompilerFlag)

if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
  # CMake tries to treat /sw and /opt/local as extension of the system path, but
  # that doesn't really work out very well.  Once you have a dependency that
  # resides there and have to add it as an include directory, then any other
  # dependency that could be satisfied from there must be--otherwise you can end
  # up with conflicting versions.  So, let's make them more of a priority having
  # them be included as one of the first places to look for dependencies.
  list(APPEND CMAKE_PREFIX_PATH /sw /opt/local)

  # If the macOS deployment target is not set manually (via $MACOSX_DEPLOYMENT_TARGET),
  # fall back to local system version. Needs to be done both here and in cmake.deps.
  if(NOT CMAKE_OSX_DEPLOYMENT_TARGET)
    execute_process(COMMAND sw_vers -productVersion
                    OUTPUT_VARIABLE MACOS_VERSION
                    OUTPUT_STRIP_TRAILING_WHITESPACE)
    set(CMAKE_OSX_DEPLOYMENT_TARGET "${MACOS_VERSION}")
  endif()
  message("Using deployment target ${CMAKE_OSX_DEPLOYMENT_TARGET}")

  # Work around some old, broken detection by CMake for knowing when to use the
  # isystem flag.  Apple's compilers have supported this for quite some time
  # now.
  if(CMAKE_C_COMPILER_ID MATCHES "GNU")
    set(CMAKE_INCLUDE_SYSTEM_FLAG_C "-isystem ")
  endif()
endif()

if(WIN32 OR CMAKE_SYSTEM_NAME STREQUAL "Darwin")
  # Ignore case when comparing filenames on Windows and Mac.
  set(CASE_INSENSITIVE_FILENAME TRUE)
  # Enable fixing case-insensitive filenames for Windows and Mac.
  set(USE_FNAME_CASE TRUE)
endif()

option(ENABLE_LIBINTL "enable libintl" ON)
option(ENABLE_LIBICONV "enable libiconv" ON)
if (MINGW)
  # Disable LTO by default as it may not compile
  # See https://github.com/Alexpux/MINGW-packages/issues/3516
  # and https://github.com/neovim/neovim/pull/8654#issuecomment-402316672
  option(ENABLE_LTO "enable link time optimization" OFF)
else()
  option(ENABLE_LTO "enable link time optimization" ON)
endif()

message(STATUS "CMAKE_INSTALL_PREFIX=${CMAKE_INSTALL_PREFIX}")

set_default_buildtype()
if(CMAKE_BUILD_TYPE MATCHES Debug)
  set(DEBUG 1)
else()
  set(DEBUG 0)
endif()

# If not in a git repo (e.g., a tarball) these tokens define the complete
# version string, else they are combined with the result of `git describe`.
set(NVIM_VERSION_MAJOR 0)
set(NVIM_VERSION_MINOR 9)
set(NVIM_VERSION_PATCH 0)
set(NVIM_VERSION_PRERELEASE "-dev") # for package maintainers

# API level
set(NVIM_API_LEVEL 10)         # Bump this after any API change.
set(NVIM_API_LEVEL_COMPAT 0)  # Adjust this after a _breaking_ API change.
set(NVIM_API_PRERELEASE false)

set(NVIM_VERSION_BUILD_TYPE "${CMAKE_BUILD_TYPE}")
# NVIM_VERSION_CFLAGS set further below.

# Log level (MIN_LOG_LEVEL in log.h)
if("${MIN_LOG_LEVEL}" MATCHES "^$")
  # Minimize logging for release-type builds.
  if(CMAKE_BUILD_TYPE STREQUAL "Release"
      OR CMAKE_BUILD_TYPE STREQUAL "RelWithDebInfo"
      OR CMAKE_BUILD_TYPE STREQUAL "MinSizeRel")
    message(STATUS "MIN_LOG_LEVEL not specified, default is 3 (ERROR) for release builds")
    set(MIN_LOG_LEVEL 3)
  else()
    message(STATUS "MIN_LOG_LEVEL not specified, default is 1 (INFO)")
    set(MIN_LOG_LEVEL 1)
  endif()
else()
  if(NOT MIN_LOG_LEVEL MATCHES "^[0-3]$")
    message(FATAL_ERROR "invalid MIN_LOG_LEVEL: " ${MIN_LOG_LEVEL})
  endif()
  message(STATUS "MIN_LOG_LEVEL=${MIN_LOG_LEVEL}")
endif()

# Default to -O2 on release builds.
if(CMAKE_C_FLAGS_RELEASE MATCHES "-O3")
  message(STATUS "Replacing -O3 in CMAKE_C_FLAGS_RELEASE with -O2")
  string(REPLACE "-O3" "-O2" CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE}")
endif()

if(CMAKE_C_COMPILER_ID MATCHES "GNU")
  check_c_compiler_flag(-Og HAS_OG_FLAG)
else()
  set(HAS_OG_FLAG 0)
endif()

#
# Build-type: RelWithDebInfo
#
if(HAS_OG_FLAG)
  set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO} -Og -g")
endif()
# We _want_ assertions in RelWithDebInfo build-type.
if(CMAKE_C_FLAGS_RELWITHDEBINFO MATCHES DNDEBUG)
  string(REPLACE "-DNDEBUG" "" CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELWITHDEBINFO}")
endif()

option(ENABLE_IWYU "Run include-what-you-use with the compiler." OFF)
if(ENABLE_IWYU)
  find_program(IWYU_PRG NAMES include-what-you-use iwyu)
  if(NOT IWYU_PRG)
    message(FATAL_ERROR "ENABLE_IWYU is ON but include-what-you-use is not found!")
  endif()
  set(CMAKE_C_INCLUDE_WHAT_YOU_USE ${IWYU_PRG}
    -Xiwyu --mapping_file=${PROJECT_SOURCE_DIR}/cmake.config/iwyu/mapping.imp
    -Xiwyu --mapping_file=${PROJECT_SOURCE_DIR}/cmake.config/iwyu/gcc.libc.imp
    -Xiwyu --mapping_file=${PROJECT_SOURCE_DIR}/cmake.config/iwyu/gcc.symbols.imp
    -Xiwyu --no_default_mappings)
  add_definitions(-DEXITFREE)
endif()

# gcc 4.0+ sets _FORTIFY_SOURCE=2 automatically.  This currently
# does not work with Neovim due to some uses of dynamically-sized structures.
# https://github.com/neovim/neovim/issues/223
include(CheckCSourceCompiles)

# Include the build type's default flags in the check for _FORTIFY_SOURCE,
# otherwise we may incorrectly identify the level as acceptable and find out
# later that it was not when optimizations were enabled.  CFLAGS is applied
# even though you don't see it in CMAKE_REQUIRED_FLAGS.
set(INIT_FLAGS_NAME CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE})
string(TOUPPER ${INIT_FLAGS_NAME} INIT_FLAGS_NAME)
if(${INIT_FLAGS_NAME})
  set(CMAKE_REQUIRED_FLAGS "${${INIT_FLAGS_NAME}}")
endif()

# Include <string.h> because some toolchains define _FORTIFY_SOURCE=2 in
# internal header files, which should in turn be #included by <string.h>.
check_c_source_compiles("
#include <string.h>

#if defined(_FORTIFY_SOURCE) && _FORTIFY_SOURCE > 1
#error \"_FORTIFY_SOURCE > 1\"
#endif
int
main(void)
{
  return 0;
}
" HAS_ACCEPTABLE_FORTIFY)

if(NOT HAS_ACCEPTABLE_FORTIFY)
  message(STATUS "Unsupported _FORTIFY_SOURCE found, forcing _FORTIFY_SOURCE=1")
  # Extract possible prefix to _FORTIFY_SOURCE (e.g. -Wp,-D_FORTIFY_SOURCE).
  STRING(REGEX MATCH "[^\ ]+-D_FORTIFY_SOURCE" _FORTIFY_SOURCE_PREFIX "${CMAKE_C_FLAGS}")
  STRING(REPLACE "-D_FORTIFY_SOURCE" "" _FORTIFY_SOURCE_PREFIX "${_FORTIFY_SOURCE_PREFIX}" )
  if(NOT _FORTIFY_SOURCE_PREFIX STREQUAL "")
    message(STATUS "Detected _FORTIFY_SOURCE Prefix=${_FORTIFY_SOURCE_PREFIX}")
  endif()
  # -U in add_definitions doesn't end up in the correct spot, so we add it to
  # the flags variable instead.
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_FORTIFY_SOURCE_PREFIX}-U_FORTIFY_SOURCE ${_FORTIFY_SOURCE_PREFIX}-D_FORTIFY_SOURCE=1")
endif()

# Remove --sort-common from linker flags, as this seems to cause bugs (see #2641, #3374).
# TODO: Figure out the root cause.
if(CMAKE_EXE_LINKER_FLAGS MATCHES "--sort-common" OR
   CMAKE_SHARED_LINKER_FLAGS MATCHES "--sort-common" OR
   CMAKE_MODULE_LINKER_FLAGS MATCHES "--sort-common")
  message(STATUS "Removing --sort-common from linker flags")
  string(REGEX REPLACE ",--sort-common(=[^,]+)?" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
  string(REGEX REPLACE ",--sort-common(=[^,]+)?" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
  string(REGEX REPLACE ",--sort-common(=[^,]+)?" "" CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS}")

  # If no linker flags remain for a -Wl argument, remove it.
  # '-Wl$' will match LDFLAGS="-Wl,--sort-common",
  # '-Wl ' will match LDFLAGS="-Wl,--sort-common -Wl,..."
  string(REGEX REPLACE "-Wl($| )" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
  string(REGEX REPLACE "-Wl($| )" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}")
  string(REGEX REPLACE "-Wl($| )" "" CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS}")
endif()

check_c_source_compiles("
#include <execinfo.h>
int main(void)
{
  void *trace[1];
  backtrace(trace, 1);
  return 0;
}
" HAVE_EXECINFO_BACKTRACE)

check_c_source_compiles("
int main(void)
{
  int a = 42;
  __builtin_add_overflow(a, a, &a);
  __builtin_sub_overflow(a, a, &a);
  return 0;
}
" HAVE_BUILTIN_ADD_OVERFLOW)

option(ENABLE_COMPILER_SUGGESTIONS "Enable -Wsuggest compiler warnings" OFF)
if(MSVC)
  # XXX: /W4 gives too many warnings. #3241
  add_compile_options(-W1 -wd4311)
  add_definitions(-D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE)
  add_definitions(-DMSWIN)
else()
  add_compile_options(-Wall -Wextra -pedantic -Wno-unused-parameter
    -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion
    -Wdouble-promotion
    -Wmissing-noreturn
    -Wmissing-format-attribute
    -Wmissing-prototypes)

  check_c_compiler_flag(-Wimplicit-fallthrough HAVE_WIMPLICIT_FALLTHROUGH_FLAG)
  if(HAVE_WIMPLICIT_FALLTHROUGH_FLAG)
    add_compile_options(-Wimplicit-fallthrough)
  endif()

  if(ENABLE_COMPILER_SUGGESTIONS)
    # Clang doesn't have -Wsuggest-attribute so check for each one.
    check_c_compiler_flag(-Wsuggest-attribute=pure HAVE_WSUGGEST_ATTRIBUTE_PURE)
    if(HAVE_WSUGGEST_ATTRIBUTE_PURE)
      add_compile_options(-Wsuggest-attribute=pure)
    endif()

    check_c_compiler_flag(-Wsuggest-attribute=const HAVE_WSUGGEST_ATTRIBUTE_CONST)
    if(HAVE_WSUGGEST_ATTRIBUTE_CONST)
      add_compile_options(-Wsuggest-attribute=const)
    endif()

    check_c_compiler_flag(-Wsuggest-attribute=malloc HAVE_WSUGGEST_ATTRIBUTE_MALLOC)
    if(HAVE_WSUGGEST_ATTRIBUTE_MALLOC)
      add_compile_options(-Wsuggest-attribute=malloc)
    endif()

    check_c_compiler_flag(-Wsuggest-attribute=cold HAVE_WSUGGEST_ATTRIBUTE_COLD)
    if(HAVE_WSUGGEST_ATTRIBUTE_COLD)
      add_compile_options(-Wsuggest-attribute=cold)
    endif()
  endif()

  # On FreeBSD 64 math.h uses unguarded C11 extension, which taints clang
  # 3.4.1 used there.
  if(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD" AND CMAKE_C_COMPILER_ID MATCHES "Clang")
    add_compile_options(-Wno-c11-extensions)
  endif()
endif()

if(MINGW)
  # Use POSIX compatible stdio in Mingw
  add_definitions(-D__USE_MINGW_ANSI_STDIO)
  add_definitions(-DMSWIN)
endif()
if(WIN32)
  # Windows Vista is the minimum supported version
  add_definitions(-D_WIN32_WINNT=0x0600)
endif()

# OpenBSD's GCC (4.2.1) doesn't have -Wvla
check_c_compiler_flag(-Wvla HAS_WVLA_FLAG)
if(HAS_WVLA_FLAG)
  add_compile_options(-Wvla)
endif()

if(UNIX)
  # -fstack-protector breaks non Unix builds even in Mingw-w64
  check_c_compiler_flag(-fstack-protector-strong HAS_FSTACK_PROTECTOR_STRONG_FLAG)
  check_c_compiler_flag(-fstack-protector HAS_FSTACK_PROTECTOR_FLAG)

  if(HAS_FSTACK_PROTECTOR_STRONG_FLAG)
    add_compile_options(-fstack-protector-strong)
    link_libraries(-fstack-protector-strong)
  elseif(HAS_FSTACK_PROTECTOR_FLAG)
    add_compile_options(-fstack-protector --param ssp-buffer-size=4)
    link_libraries(-fstack-protector --param ssp-buffer-size=4)
  endif()
endif()

check_c_compiler_flag(-fno-common HAVE_FNO_COMMON)
if (HAVE_FNO_COMMON)
  add_compile_options(-fno-common)
endif()

check_c_compiler_flag(-fdiagnostics-color=auto HAS_DIAG_COLOR_FLAG)
if(HAS_DIAG_COLOR_FLAG)
  if(CMAKE_GENERATOR MATCHES "Ninja")
    add_compile_options(-fdiagnostics-color=always)
  else()
    add_compile_options(-fdiagnostics-color=auto)
  endif()
endif()

option(CI_BUILD "CI, extra flags will be set" OFF)

if(CI_BUILD)
  message(STATUS "CI build enabled")
  if(MSVC)
    add_compile_options(-WX)
  else()
    add_compile_options(-Werror)
    if(DEFINED ENV{BUILD_UCHAR})
      # Get some test coverage for unsigned char
      add_compile_options(-funsigned-char)
    endif()
  endif()
endif()

option(LOG_LIST_ACTIONS "Add list actions logging" OFF)

add_definitions(-DINCLUDE_GENERATED_DECLARATIONS)

if(CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
  if(CMAKE_SYSTEM_NAME STREQUAL "SunOS")
    set(NO_UNDEFINED "-Wl,--no-undefined -lsocket")
  elseif(NOT CMAKE_SYSTEM_NAME STREQUAL "Darwin")
    set(NO_UNDEFINED "-Wl,--no-undefined")
  endif()
  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${NO_UNDEFINED}")
  set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${NO_UNDEFINED}")

  # For O_CLOEXEC, O_DIRECTORY, and O_NOFOLLOW flags on older systems
  # (pre POSIX.1-2008: glibc 2.11 and earlier). #4042
  # For ptsname(). #6743
  add_definitions(-D_GNU_SOURCE)
endif()

if(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND CMAKE_SIZEOF_VOID_P EQUAL 8 AND NOT PREFER_LUA AND LUAJIT_VERSION LESS "2.1.0-beta3")
  # Required for luajit < 2.1.0-beta3.
  set(CMAKE_EXE_LINKER_FLAGS
    "${CMAKE_EXE_LINKER_FLAGS} -pagezero_size 10000 -image_base 100000000")
  set(CMAKE_SHARED_LINKER_FLAGS
    "${CMAKE_SHARED_LINKER_FLAGS} -image_base 100000000")
  set(CMAKE_MODULE_LINKER_FLAGS
    "${CMAKE_MODULE_LINKER_FLAGS} -image_base 100000000")
endif()

include_directories("${PROJECT_BINARY_DIR}/cmake.config")
include_directories("${PROJECT_SOURCE_DIR}/src")

find_package(LibUV 1.28.0 REQUIRED)
include_directories(SYSTEM ${LIBUV_INCLUDE_DIRS})

find_package(Msgpack 1.0.0 REQUIRED)
include_directories(SYSTEM ${MSGPACK_INCLUDE_DIRS})

find_package(LibLUV 1.43.0 REQUIRED)
include_directories(SYSTEM ${LIBLUV_INCLUDE_DIRS})

find_package(TreeSitter REQUIRED)
include_directories(SYSTEM ${TreeSitter_INCLUDE_DIRS})

list(APPEND CMAKE_REQUIRED_INCLUDES "${TreeSitter_INCLUDE_DIRS}")
list(APPEND CMAKE_REQUIRED_LIBRARIES "${TreeSitter_LIBRARIES}")
check_c_source_compiles("
#include <tree_sitter/api.h>
int
main(void)
{
  TSQueryCursor *cursor = ts_query_cursor_new();
  ts_query_cursor_set_match_limit(cursor, 32);
  return 0;
}
" TS_HAS_SET_MATCH_LIMIT)
if(TS_HAS_SET_MATCH_LIMIT)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNVIM_TS_HAS_SET_MATCH_LIMIT")
endif()
check_c_source_compiles("
#include <stdlib.h>
#include <tree_sitter/api.h>
int
main(void)
{
  ts_set_allocator(malloc, calloc, realloc, free);
  return 0;
}
" TS_HAS_SET_ALLOCATOR)
if(TS_HAS_SET_ALLOCATOR)
  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNVIM_TS_HAS_SET_ALLOCATOR")
endif()

# The unit test lib requires LuaJIT; it will be skipped if LuaJIT is missing.
option(PREFER_LUA "Prefer Lua over LuaJIT in the nvim executable." OFF)

if(PREFER_LUA)
  find_package(Lua 5.1 EXACT REQUIRED)
  set(LUA_PREFERRED_INCLUDE_DIRS ${LUA_INCLUDE_DIR})
  set(LUA_PREFERRED_LIBRARIES ${LUA_LIBRARIES})
  # Passive (not REQUIRED): if LUAJIT_FOUND is not set, nvim-test is skipped.
  find_package(LuaJit)
else()
  find_package(LuaJit REQUIRED)
  set(LUA_PREFERRED_INCLUDE_DIRS ${LUAJIT_INCLUDE_DIRS})
  set(LUA_PREFERRED_LIBRARIES ${LUAJIT_LIBRARIES})
endif()

list(APPEND CMAKE_REQUIRED_INCLUDES "${MSGPACK_INCLUDE_DIRS}")
check_c_source_compiles("
#include <msgpack.h>

int
main(void)
{
  return MSGPACK_OBJECT_FLOAT32;
}
" MSGPACK_HAS_FLOAT32)
list(REMOVE_ITEM CMAKE_REQUIRED_INCLUDES "${MSGPACK_INCLUDE_DIRS}")
if(MSGPACK_HAS_FLOAT32)
  add_definitions(-DNVIM_MSGPACK_HAS_FLOAT32)
endif()

option(FEAT_TUI "Enable the Terminal UI" ON)

if(FEAT_TUI)
  find_package(UNIBILIUM 2.0 REQUIRED)
  include_directories(SYSTEM ${UNIBILIUM_INCLUDE_DIRS})

  list(APPEND CMAKE_REQUIRED_INCLUDES "${UNIBILIUM_INCLUDE_DIRS}")
  list(APPEND CMAKE_REQUIRED_LIBRARIES "${UNIBILIUM_LIBRARIES}")
  check_c_source_compiles("
  #include <unibilium.h>

  int
  main(void)
  {
    return unibi_num_from_var(unibi_var_from_num(0));
  }
  " UNIBI_HAS_VAR_FROM)
  list(REMOVE_ITEM CMAKE_REQUIRED_INCLUDES "${UNIBILIUM_INCLUDE_DIRS}")
  list(REMOVE_ITEM CMAKE_REQUIRED_LIBRARIES "${UNIBILIUM_LIBRARIES}")
  if(UNIBI_HAS_VAR_FROM)
    add_definitions(-DNVIM_UNIBI_HAS_VAR_FROM)
  endif()

  find_package(LibTermkey 0.22 REQUIRED)
  include_directories(SYSTEM ${LIBTERMKEY_INCLUDE_DIRS})
endif()

find_package(LIBVTERM 0.3 REQUIRED)
include_directories(SYSTEM ${LIBVTERM_INCLUDE_DIRS})

option(CLANG_ASAN_UBSAN "Enable Clang address & undefined behavior sanitizer for nvim binary." OFF)
option(CLANG_MSAN "Enable Clang memory sanitizer for nvim binary." OFF)
option(CLANG_TSAN "Enable Clang thread sanitizer for nvim binary." OFF)

if((CLANG_ASAN_UBSAN AND CLANG_MSAN)
    OR (CLANG_ASAN_UBSAN AND CLANG_TSAN)
    OR (CLANG_MSAN AND CLANG_TSAN))
  message(FATAL_ERROR "Sanitizers cannot be enabled simultaneously")
endif()

if((CLANG_ASAN_UBSAN OR CLANG_MSAN OR CLANG_TSAN) AND NOT CMAKE_C_COMPILER_ID MATCHES "Clang")
  message(FATAL_ERROR "Sanitizers are only supported for Clang")
endif()

if(ENABLE_LIBICONV)
  find_package(Iconv REQUIRED)
  include_directories(SYSTEM ${Iconv_INCLUDE_DIRS})
endif()

if(ENABLE_LIBINTL)
  # LibIntl (not Intl) selects our FindLibIntl.cmake script. #8464
  find_package(LibIntl REQUIRED)
  include_directories(SYSTEM ${LibIntl_INCLUDE_DIRS})
endif()

# Determine platform's threading library. Set CMAKE_THREAD_PREFER_PTHREAD
# explicitly to indicate a strong preference for pthread.
set(CMAKE_THREAD_PREFER_PTHREAD ON)
find_package(Threads REQUIRED)

# Place targets in bin/ or lib/ for all build configurations
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
foreach(CFGNAME ${CMAKE_CONFIGURATION_TYPES})
  string(TOUPPER ${CFGNAME} CFGNAME)
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_${CFGNAME} ${CMAKE_BINARY_DIR}/bin)
  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY_${CFGNAME} ${CMAKE_BINARY_DIR}/lib)
  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY_${CFGNAME} ${CMAKE_BINARY_DIR}/lib)
endforeach()

# Find Lua interpreter
include(LuaHelpers)
set(LUA_DEPENDENCIES lpeg mpack bit)
if(NOT LUA_PRG)
  foreach(CURRENT_LUA_PRG luajit lua5.1 lua5.2 lua)
    unset(_CHECK_LUA_PRG CACHE)
    unset(LUA_PRG_WORKS)
    find_program(_CHECK_LUA_PRG ${CURRENT_LUA_PRG})

    if(_CHECK_LUA_PRG)
      check_lua_deps(${_CHECK_LUA_PRG} "${LUA_DEPENDENCIES}" LUA_PRG_WORKS)
      if(LUA_PRG_WORKS)
        set(LUA_PRG "${_CHECK_LUA_PRG}" CACHE FILEPATH "Path to a program.")
        break()
      endif()
    endif()
  endforeach()
  unset(_CHECK_LUA_PRG CACHE)
else()
  check_lua_deps(${LUA_PRG} "${LUA_DEPENDENCIES}" LUA_PRG_WORKS)
endif()

if(NOT LUA_PRG_WORKS)
  message(FATAL_ERROR "Failed to find a Lua 5.1-compatible interpreter")
endif()

message(STATUS "Using Lua interpreter: ${LUA_PRG}")

option(COMPILE_LUA "Pre-compile Lua sources into bytecode (for sources that are included in the binary)" ON)

if(COMPILE_LUA AND NOT WIN32)
  if(PREFER_LUA)
    foreach(CURRENT_LUAC_PRG luac5.1 luac)
      find_program(_CHECK_LUAC_PRG ${CURRENT_LUAC_PRG})
      if(_CHECK_LUAC_PRG)
        set(LUAC_PRG "${_CHECK_LUAC_PRG} -s -o - %s" CACHE STRING "Format for compiling to Lua bytecode")
        break()
      endif()
    endforeach()
  elseif(LUA_PRG MATCHES "luajit")
    check_lua_module(${LUA_PRG} "jit.bcsave" LUAJIT_HAS_JIT_BCSAVE)
    if(LUAJIT_HAS_JIT_BCSAVE)
      set(LUAC_PRG "${LUA_PRG} -b -s %s -" CACHE STRING "Format for compiling to Lua bytecode")
    endif()
  endif()
endif()

if(LUAC_PRG)
  message(STATUS "Using Lua compiler: ${LUAC_PRG}")
endif()

# Setup busted.
find_program(BUSTED_PRG NAMES busted busted.bat)
find_program(BUSTED_LUA_PRG busted-lua)
if(NOT BUSTED_OUTPUT_TYPE)
  set(BUSTED_OUTPUT_TYPE "nvim")
endif()

#
# Lint
#
find_program(LUACHECK_PRG luacheck)
find_program(STYLUA_PRG stylua)
find_program(UNCRUSTIFY_PRG uncrustify)
find_program(SHELLCHECK_PRG shellcheck)

add_glob_target(
  REQUIRED
  TARGET lintlua-luacheck
  COMMAND ${LUACHECK_PRG}
  FLAGS -q
  GLOB_DIRS runtime/ scripts/ src/ test/
  GLOB_PAT *.lua
  TOUCH_STRATEGY SINGLE
  )

add_glob_target(
  TARGET lintlua-stylua
  COMMAND ${STYLUA_PRG}
  FLAGS --color=always --check
  GLOB_DIRS runtime/
  GLOB_PAT *.lua
  TOUCH_STRATEGY SINGLE
  )

add_custom_target(lintlua)
add_dependencies(lintlua lintlua-luacheck lintlua-stylua)

include(InstallHelpers)

add_glob_target(
  TARGET lintsh
  COMMAND ${SHELLCHECK_PRG}
  FLAGS -x -a
  GLOB_DIRS scripts ci
  GLOB_PAT *.sh
  EXCLUDE
    scripts/pvscheck.sh
    ci/common
    ci/snap
  TOUCH_STRATEGY SINGLE
  )

add_custom_target(lintcommit
  COMMAND ${PROJECT_BINARY_DIR}/bin/nvim -u NONE -es -c [[lua require('scripts.lintcommit').main({trace=false})]]
  WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
  VERBATIM)
add_dependencies(lintcommit nvim)

add_custom_target(lint)
add_dependencies(lint check-single-includes lintc lintlua lintsh lintcommit lintuncrustify)

#
# Format
#
add_custom_target(formatlua
  COMMAND ${CMAKE_COMMAND}
    -D FORMAT_PRG=${STYLUA_PRG}
    -D LANG=lua
    -P ${PROJECT_SOURCE_DIR}/cmake/Format.cmake
  WORKING_DIRECTORY ${PROJECT_SOURCE_DIR})

add_custom_target(format)
add_dependencies(format formatc formatlua)

install_helper(
  FILES ${CMAKE_SOURCE_DIR}/src/man/nvim.1
  DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)

#
# Go down the tree.
#

add_subdirectory(src/nvim)
get_directory_property(NVIM_VERSION_CFLAGS DIRECTORY src/nvim DEFINITION NVIM_VERSION_CFLAGS)
add_subdirectory(test/includes)
add_subdirectory(cmake.config)
add_subdirectory(test/functional/fixtures)  # compile test programs
add_subdirectory(runtime)
get_directory_property(GENERATED_HELP_TAGS DIRECTORY runtime DEFINITION GENERATED_HELP_TAGS)
if(WIN32)
  install_helper(
    FILES ${DEPS_PREFIX}/share/nvim-qt/runtime/plugin/nvim_gui_shim.vim
    DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/nvim-qt/runtime/plugin)
endif()

# Setup some test-related bits.  We do this after going down the tree because we
# need some of the targets.
if(BUSTED_PRG)
  get_property(TEST_INCLUDE_DIRS DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    PROPERTY INCLUDE_DIRECTORIES)

  # When running tests from 'ninja' we need to use the
  # console pool: to do so we need to use the USES_TERMINAL
  # option, but this is only available in CMake 3.2
  set(TEST_TARGET_ARGS)
  list(APPEND TEST_TARGET_ARGS "USES_TERMINAL")

  set(UNITTEST_PREREQS nvim-test unittest-headers)
  set(FUNCTIONALTEST_PREREQS nvim printenv-test printargs-test shell-test pwsh-test streams-test tty-test ${GENERATED_HELP_TAGS})
  set(BENCHMARK_PREREQS nvim tty-test)

  check_lua_module(${LUA_PRG} "ffi" LUA_HAS_FFI)
  if(LUA_HAS_FFI)
    add_custom_target(unittest
      COMMAND ${CMAKE_COMMAND}
        -DBUSTED_PRG=${BUSTED_PRG}
        -DLUA_PRG=${LUA_PRG}
        -DWORKING_DIR=${CMAKE_CURRENT_SOURCE_DIR}
        -DBUSTED_OUTPUT_TYPE=${BUSTED_OUTPUT_TYPE}
        -DTEST_DIR=${CMAKE_CURRENT_SOURCE_DIR}/test
        -DBUILD_DIR=${CMAKE_BINARY_DIR}
        -DTEST_TYPE=unit
        -DCIRRUS_CI=$ENV{CIRRUS_CI}
        -P ${PROJECT_SOURCE_DIR}/cmake/RunTests.cmake
      DEPENDS ${UNITTEST_PREREQS}
      ${TEST_TARGET_ARGS})
    set_target_properties(unittest PROPERTIES FOLDER test)
  else()
    message(WARNING "disabling unit tests: no Luajit FFI in ${LUA_PRG}")
  endif()

  if(LUA_HAS_FFI)
    set(TEST_LIBNVIM_PATH $<TARGET_FILE:nvim-test>)
  else()
    set(TEST_LIBNVIM_PATH "")
  endif()
  configure_file(
    ${CMAKE_SOURCE_DIR}/test/cmakeconfig/paths.lua.in
    ${CMAKE_BINARY_DIR}/test/cmakeconfig/paths.lua.gen)
  file(GENERATE
    OUTPUT ${CMAKE_BINARY_DIR}/test/cmakeconfig/paths.lua
    INPUT ${CMAKE_BINARY_DIR}/test/cmakeconfig/paths.lua.gen)

  add_custom_target(functionaltest
    COMMAND ${CMAKE_COMMAND}
      -DBUSTED_PRG=${BUSTED_PRG}
      -DLUA_PRG=${LUA_PRG}
      -DNVIM_PRG=$<TARGET_FILE:nvim>
      -DWORKING_DIR=${CMAKE_CURRENT_SOURCE_DIR}
      -DBUSTED_OUTPUT_TYPE=${BUSTED_OUTPUT_TYPE}
      -DTEST_DIR=${CMAKE_CURRENT_SOURCE_DIR}/test
      -DBUILD_DIR=${CMAKE_BINARY_DIR}
      -DTEST_TYPE=functional
      -DCIRRUS_CI=$ENV{CIRRUS_CI}
      -P ${PROJECT_SOURCE_DIR}/cmake/RunTests.cmake
    DEPENDS ${FUNCTIONALTEST_PREREQS}
    ${TEST_TARGET_ARGS})
  set_target_properties(functionaltest PROPERTIES FOLDER test)

  add_custom_target(benchmark
    COMMAND ${CMAKE_COMMAND}
      -DBUSTED_PRG=${BUSTED_PRG}
      -DLUA_PRG=${LUA_PRG}
      -DNVIM_PRG=$<TARGET_FILE:nvim>
      -DWORKING_DIR=${CMAKE_CURRENT_SOURCE_DIR}
      -DBUSTED_OUTPUT_TYPE=${BUSTED_OUTPUT_TYPE}
      -DTEST_DIR=${CMAKE_CURRENT_SOURCE_DIR}/test
      -DBUILD_DIR=${CMAKE_BINARY_DIR}
      -DTEST_TYPE=benchmark
      -DCIRRUS_CI=$ENV{CIRRUS_CI}
      -P ${PROJECT_SOURCE_DIR}/cmake/RunTests.cmake
    DEPENDS ${BENCHMARK_PREREQS}
    ${TEST_TARGET_ARGS})
  set_target_properties(benchmark PROPERTIES FOLDER test)
endif()

if(BUSTED_LUA_PRG)
  add_custom_target(functionaltest-lua
    COMMAND ${CMAKE_COMMAND}
      -DBUSTED_PRG=${BUSTED_LUA_PRG}
      -DLUA_PRG=${LUA_PRG}
      -DNVIM_PRG=$<TARGET_FILE:nvim>
      -DWORKING_DIR=${CMAKE_CURRENT_SOURCE_DIR}
      -DBUSTED_OUTPUT_TYPE=${BUSTED_OUTPUT_TYPE}
      -DTEST_DIR=${CMAKE_CURRENT_SOURCE_DIR}/test
      -DBUILD_DIR=${CMAKE_BINARY_DIR}
      -DTEST_TYPE=functional
      -DCIRRUS_CI=$ENV{CIRRUS_CI}
      -P ${PROJECT_SOURCE_DIR}/cmake/RunTests.cmake
    DEPENDS ${FUNCTIONALTEST_PREREQS}
    ${TEST_TARGET_ARGS})
    set_target_properties(functionaltest-lua PROPERTIES FOLDER test)
endif()

add_custom_target(uninstall
  COMMAND ${CMAKE_COMMAND} -P ${PROJECT_SOURCE_DIR}/cmake/UninstallHelper.cmake)

if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_CURRENT_SOURCE_DIR})
  add_subdirectory(cmake.packaging)
endif()