76 lines · python
1#!/usr/bin/env python32"""Calls `gn` with the right --dotfile= and --root= arguments for LLVM."""3 4# GN normally expects a file called '.gn' at the root of the repository.5# Since LLVM's GN build isn't supported, putting that file at the root6# is deemed inappropriate, which requires passing --dotfile= and -root= to GN.7# Since that gets old fast, this script automatically passes these arguments.8 9import os10import subprocess11import sys12 13 14THIS_DIR = os.path.dirname(__file__)15ROOT_DIR = os.path.join(THIS_DIR, "..", "..", "..")16 17 18def get_platform():19 import platform20 21 if sys.platform == "darwin":22 return "mac-amd64" if platform.machine() != "arm64" else "mac-arm64"23 if platform.machine() not in ("AMD64", "x86_64"):24 return None25 if sys.platform.startswith("linux"):26 return "linux-amd64"27 if sys.platform == "win32":28 return "windows-amd64"29 30 31def print_no_gn(mention_get):32 print("gn binary not found in PATH")33 if mention_get:34 print("run llvm/utils/gn/get.py to download a binary and try again, or")35 print("follow https://gn.googlesource.com/gn/#getting-started")36 return 137 38 39def main():40 # Find real gn executable.41 gn = "gn"42 if (43 subprocess.call(44 "gn --version",45 stdout=subprocess.DEVNULL,46 stderr=subprocess.STDOUT,47 shell=True,48 )49 != 050 ):51 # Not on path. See if get.py downloaded a prebuilt binary and run that52 # if it's there, or suggest to run get.py if it isn't.53 platform = get_platform()54 if not platform:55 return print_no_gn(mention_get=False)56 gn = os.path.join(os.path.dirname(__file__), "bin", platform, "gn")57 if not os.path.exists(gn + (".exe" if sys.platform == "win32" else "")):58 return print_no_gn(mention_get=True)59 60 # Compute --dotfile= and --root= args to add.61 extra_args = []62 gn_main_arg = next((x for x in sys.argv[1:] if not x.startswith("-")), None)63 if gn_main_arg != "help": # `gn help` gets confused by the switches.64 cwd = os.getcwd()65 dotfile = os.path.relpath(os.path.join(THIS_DIR, ".gn"), cwd)66 root = os.path.relpath(ROOT_DIR, cwd)67 extra_args = ["--dotfile=" + dotfile, "--root=" + root]68 69 # Run GN command with --dotfile= and --root= added.70 cmd = [gn] + extra_args + sys.argv[1:]71 sys.exit(subprocess.call(cmd))72 73 74if __name__ == "__main__":75 main()76