BlitzLLVM/cmake/generators/ninja.cmake

# Copyright (C) 2024-2025 Michael Fabian 'Xaymar' Dirks
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# This is a script file that installs the necessary "Ninja" and "Ninja Multi-Config" generators.
# Run with `cmake -P cmake/generators/ninja.cmake` from the source directory.

cmake_minimum_required(VERSION 4.0 FATAL_ERROR)
include_guard(GLOBAL)
list(APPEND CMAKE_MESSAGE_INDENT "[Ninja] ")

# Necessary for propagation into the try_compile CMake subprocesses. It's unclear why this is not the default behavior.
foreach(_T IN ITEMS CMAKE_MAKE_PROGRAM)
	if(DEFINED ENV{${_T}})
		set(${_T} "$ENV{${_T}}")
	endif()
endforeach()

if(NOT CMAKE_MAKE_PROGRAM)
	# Try and figure out what processor we need to get binaries for.
	if(CMAKE_HOST_SYSTEM_NAME MATCHES "[Ww]indows")
		string(TOLOWER "$ENV{PROCESSOR_ARCHITECTURE}" _ARCH)
		set(_OS "windows")
	elseif(CMAKE_HOST_SYSTEM_NAME MATCHES "[Dd]arwin")
		set(_ARCH "multiarch")
		set(_OS "macos")
	elseif(CMAKE_HOST_SYSTEM_NAME MATCHES "[Oo]pen[Bb][Ss][Dd]")
		set(_OS "openbsd")
		execute_process(
			COMMAND "arch"
			OUTPUT_VARIABLE _ARCH
			OUTPUT_STRIP_TRAILING_WHITESPACE
		)
	else()
		set(_OS "linux")
		execute_process(
			COMMAND "uname -p"
			OUTPUT_VARIABLE _ARCH
			OUTPUT_STRIP_TRAILING_WHITESPACE
			RESULT_VARIABLE _RES
		)
		if(_RES EQUAL 0)
			execute_process(
				COMMAND "uname -m"
				OUTPUT_VARIABLE _ARCH
				OUTPUT_STRIP_TRAILING_WHITESPACE
				RESULT_VARIABLE _RES
			)
		endif()
	endif()

	set(NINJA_VERSION "1.12.1")
	set(NINJA_DIR "${CMAKE_SOURCE_DIR}/extra/ninja-${NINJA_VERSION}-${_OS}-${_ARCH}")

	# Check if Ninja is present and if it is up to date.
	find_program(NINJA_BIN
		NAMES
			ninja
		HINTS
			"${NINJA_DIR}/"
		NO_CACHE NO_DEFAULT_PATH NO_PACKAGE_ROOT_PATH NO_CMAKE_PATH NO_CMAKE_ENVIRONMENT_PATH NO_SYSTEM_ENVIRONMENT_PATH NO_CMAKE_SYSTEM_PATH NO_CMAKE_INSTALL_PREFIX NO_CMAKE_FIND_ROOT_PATH
	)
	if(IS_EXECUTABLE "${NINJA_BIN}")
		execute_process(
			COMMAND ${NINJA_BIN} --version
			OUTPUT_VARIABLE NINJA_VERSION_INSTALLED
			OUTPUT_STRIP_TRAILING_WHITESPACE
		)
		string(REGEX REPLACE "[\r\n]+" "" NINJA_VERSION_INSTALLED "${NINJA_VERSION_INSTALLED}")
		if((EXISTS NINJA_BIN) AND (NINJA_VERSION_INSTALLED VERSION_LESS NINJA_VERSION))
			message(STATUS "Found outdated v${NINJA_VERSION_INSTALLED}.")
			unset(NINJA_BIN)
		else()
			#message(STATUS "Found v${NINJA_VERSION_INSTALLED}.")
		endif()
	endif()

	if((NOT IS_EXECUTABLE "${NINJA_BIN}") OR (NINJA_VERSION_INSTALLED VERSION_LESS NINJA_VERSION))
		# It isn't up to date or doesn't exist, so try to download the latest version.

		# First we'll have to figure out what we need to download, and from where.
		if(_OS MATCHES "windows")
			# Windows and Windows-like
			SET (_FILE_EXT "zip")
			if(_ARCH MATCHES "([xX]86)|([aA][mM][dD]64)")
				# It's x86, x86-64 or amd64
				SET (_FILE_NAME "ninja-win")
			else()
				# Assume ARM or ARM64
				SET (_FILE_NAME "ninja-winarm64")
			endif()
		elseif(_OS MATCHES "macos")
			# MacOS and MacOS-like
			SET (_FILE_EXT "zip")
			SET (_FILE_NAME "ninja-mac")
		else()
			# Assume this to be generic Unix-like.
			SET (_FILE_EXT "tar.xz")
			if(_ARCH MATCHES "([xX]86)|([aA][mM][dD]64)")
				# It's x86, x86-64 or amd64
				SET (_FILE_NAME "ninja-linux")
			else()
				# Assume ARM or ARM64
				SET (_FILE_NAME "ninja-linux-aarch64")
			endif()
		endif()

		# Download the ideal version.
		if(NOT EXISTS "${NINJA_DIR}.${_FILE_EXT}")
			message(STATUS "Downloading Ninja v${NINJA_VERSION}...")
			file(DOWNLOAD
				"https://github.com/ninja-build/ninja/releases/download/v${NINJA_VERSION}/${_FILE_NAME}.${_FILE_EXT}"
				"${NINJA_DIR}.${_FILE_EXT}"
				SHOW_PROGRESS
			)
		else()
			message(STATUS "Skipping download as file already exists.")
		endif()

		# Extract it.
		message(STATUS "Extracting...")
		file(ARCHIVE_EXTRACT
			INPUT "${NINJA_DIR}.${_FILE_EXT}"
			DESTINATION "${NINJA_DIR}/"
		)

		# Delete the archive itself.
		message(STATUS "Cleaning...")
		#file(REMOVE "${NINJA_DIR}.${_FILE_EXT}")

		# Check if Ninja is present and if it is up to date.
		message(STATUS "Testing...")
		find_program(NINJA_BIN
			NAMES
				ninja
			HINTS
				"${NINJA_DIR}/"
			NO_CACHE NO_DEFAULT_PATH NO_PACKAGE_ROOT_PATH NO_CMAKE_PATH NO_CMAKE_ENVIRONMENT_PATH NO_SYSTEM_ENVIRONMENT_PATH NO_CMAKE_SYSTEM_PATH NO_CMAKE_INSTALL_PREFIX NO_CMAKE_FIND_ROOT_PATH
		)
		if(IS_EXECUTABLE "${NINJA_BIN}")
			execute_process(
				COMMAND ${NINJA_BIN} --version
				OUTPUT_VARIABLE NINJA_VERSION_INSTALLED
				OUTPUT_STRIP_TRAILING_WHITESPACE
			)
			string(REGEX REPLACE "[\r\n]+" "" NINJA_VERSION_INSTALLED "${NINJA_VERSION_INSTALLED}")
		endif()
	endif()

	if((NOT IS_EXECUTABLE "${NINJA_BIN}") OR (NINJA_VERSION_INSTALLED VERSION_LESS NINJA_VERSION))
		message(FATAL_ERROR "Failed to install newer version of Ninja.")
	elseif(IS_EXECUTABLE "${NINJA_BIN}")
		message(STATUS "Found v${NINJA_VERSION_INSTALLED}.")
	endif()

	set(CMAKE_MAKE_PROGRAM "${NINJA_BIN}" CACHE STRING "" FORCE)
endif()

list(POP_BACK CMAKE_MESSAGE_INDENT)