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◆ main openmsx / build / detectsys.py
4.0 KiB · Python · last changed chore(): initial commit 1 month ago source blame history raw
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# Detect the native CPU and OS.
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# Actually we rely on the Python "platform" module and map its output to names
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# that the openMSX build understands.
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from executils import captureStdout
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from platform import architecture, machine, system
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from subprocess import PIPE, STDOUT, Popen
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import sys
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def detectCPU():
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	'''Detects the CPU family (not the CPU model) of the machine were are
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	running on.
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	Raises ValueError if no known CPU is detected.
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	'''
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	cpu = machine().lower()
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	dashIndex = cpu.find('-')
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	if dashIndex != -1:
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		# Hurd returns "cputype-cpusubtype" instead of just "cputype".
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		cpu = cpu[ : dashIndex]
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	if cpu in ('x86_64', 'amd64'):
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		return 'x86_64'
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	elif cpu in ('x86', 'i386', 'i486', 'i586', 'i686'):
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		return 'x86'
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	elif cpu == 'ppc64le':
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		return 'ppc64le'
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	elif cpu.startswith('ppc') or cpu.endswith('ppc') or cpu.startswith('power'):
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		return 'ppc64' if cpu.endswith('64') else 'ppc'
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	elif cpu == 'arm64':
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		# Darwin uses "arm64", unlike Linux.
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		return 'aarch64'
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	elif cpu.startswith('arm'):
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		return 'arm'
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	elif cpu == 'aarch64':
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		return 'aarch64'
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	elif cpu == 'aarch64_be':
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		return 'aarch64_be'
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	elif cpu.startswith('mips') or cpu == 'sgi':
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		return 'mipsel' if cpu.endswith('el') else 'mips'
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	elif cpu == 'm68k':
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		return 'm68k'
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	elif cpu == 'ia64':
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		return 'ia64'
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	elif cpu.startswith('alpha'):
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		return 'alpha'
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	elif cpu.startswith('hppa') or cpu.startswith('parisc'):
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		return 'hppa'
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	elif cpu.startswith('s390'):
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		return 's390'
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	elif cpu.startswith('sparc') or cpu.startswith('sun4u'):
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		return 'sparc'
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	elif cpu.startswith('sh'):
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		return 'sheb' if cpu.endswith('eb') else 'sh'
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	elif cpu == 'avr32':
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		return 'avr32'
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	elif cpu == 'riscv64':
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		return 'riscv64'
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	elif cpu == 'loongarch64':
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		return 'loongarch64'
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	elif cpu == '':
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		# Python couldn't figure it out.
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		os = system().lower()
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		if os == 'windows':
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			# Relatively safe bet.
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			return 'x86'
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		raise ValueError('Unable to detect CPU')
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	else:
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		raise ValueError('Unsupported or unrecognised CPU "%s"' % cpu)
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def detectOS():
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	'''Detects the operating system of the machine were are running on.
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	Raises ValueError if no known OS is detected.
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	'''
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	os = system().lower()
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	if os in (
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		'linux', 'darwin', 'freebsd', 'netbsd', 'openbsd', 'dragonfly', 'gnu'
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		):
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		return os
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	elif os.startswith('gnu/'):
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		# GNU userland on non-Hurd kernel, for example Debian GNU/kFreeBSD.
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		# For openMSX the kernel is not really relevant, so treat it like
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		# a generic GNU system.
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		return 'gnu'
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	elif os.startswith('mingw') or os == 'windows':
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		return 'mingw-w64'
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	elif os == 'sunos':
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		return 'solaris'
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	elif os == '':
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		# Python couldn't figure it out.
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		raise ValueError('Unable to detect OS')
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	else:
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		raise ValueError('Unsupported or unrecognised OS "%s"' % os)
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def getCompilerMachine():
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	# Note: Recent GCC and Clang versions support this option.
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	machine = captureStdout(sys.stderr, 'cc -dumpmachine')
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	if machine is not None:
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		machineParts = machine.split('-')
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		if len(machineParts) >= 3:
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			return machineParts[0], machineParts[2]
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	return None, None
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if __name__ == '__main__':
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	try:
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		hostCPU = detectCPU()
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		if hostCPU == 'mips':
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			# Little endian MIPS is reported as just "mips" by Linux Python.
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			compilerCPU, compilerOS = getCompilerMachine()
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			if compilerCPU == 'mips':
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				pass
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			elif compilerCPU == 'mipsel':
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				hostCPU = compilerCPU
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			else:
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				print(
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					'Warning: Unabling to determine endianess; '
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					'compiling for big endian',
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					file=sys.stderr
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					)
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		hostOS = detectOS()
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		if hostOS == 'mingw32' and hostCPU == 'x86_64':
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			# It is possible to run MinGW on 64-bit Windows, but producing
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			# 64-bit code is not supported yet.
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			hostCPU = 'x86'
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		elif hostOS == 'darwin' and hostCPU == 'x86':
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			# If Python is 64-bit, both the CPU and OS support it, so we can
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			# compile openMSX for x86-64. Compiling in 32-bit mode might seem
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			# safer, but will fail if using MacPorts on a 64-bit capable system.
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			if architecture()[0] == '64bit':
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				hostCPU = 'x86_64'
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		print(hostCPU, hostOS)
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	except ValueError as ex:
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		print(ex, file=sys.stderr)
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		sys.exit(1)