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#!/usr/bin/env python3
"""Calls `gn` with the right --dotfile= and --root= arguments for LLVM."""
# GN normally expects a file called '.gn' at the root of the repository.
# Since LLVM's GN build isn't supported, putting that file at the root
# is deemed inappropriate, which requires passing --dotfile= and -root= to GN.
# Since that gets old fast, this script automatically passes these arguments.
import os
import subprocess
import sys
THIS_DIR = os.path.dirname(__file__)
ROOT_DIR = os.path.join(THIS_DIR, "..", "..", "..")
def get_platform():
import platform
if sys.platform == "darwin":
return "mac-amd64" if platform.machine() != "arm64" else "mac-arm64"
if platform.machine() not in ("AMD64", "x86_64"):
return None
if sys.platform.startswith("linux"):
return "linux-amd64"
if sys.platform == "win32":
return "windows-amd64"
def print_no_gn(mention_get):
print("gn binary not found in PATH")
if mention_get:
print("run llvm/utils/gn/get.py to download a binary and try again, or")
print("follow https://gn.googlesource.com/gn/#getting-started")
return 1
def main():
# Find real gn executable.
gn = "gn"
if (
subprocess.call(
"gn --version",
stdout=open(os.devnull, "w"),
stderr=subprocess.STDOUT,
shell=True,
)
!= 0
):
# Not on path. See if get.py downloaded a prebuilt binary and run that
# if it's there, or suggest to run get.py if it isn't.
platform = get_platform()
if not platform:
return print_no_gn(mention_get=False)
gn = os.path.join(os.path.dirname(__file__), "bin", platform, "gn")
if not os.path.exists(gn + (".exe" if sys.platform == "win32" else "")):
return print_no_gn(mention_get=True)
# Compute --dotfile= and --root= args to add.
extra_args = []
gn_main_arg = next((x for x in sys.argv[1:] if not x.startswith("-")), None)
if gn_main_arg != "help": # `gn help` gets confused by the switches.
cwd = os.getcwd()
dotfile = os.path.relpath(os.path.join(THIS_DIR, ".gn"), cwd)
root = os.path.relpath(ROOT_DIR, cwd)
extra_args = ["--dotfile=" + dotfile, "--root=" + root]
# Run GN command with --dotfile= and --root= added.
cmd = [gn] + extra_args + sys.argv[1:]
sys.exit(subprocess.call(cmd))
if __name__ == "__main__":
main()
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