#!/usr/bin/python3

# Check an llvm bcanalyzer dump for -flto

# This script implements the following command in python
# to avoid PCRE backtrace limits in grep.
# grep -xP '.*\-flto((?!-fno-lto).)*' <input file>

import re
import sys

def open_input_file():
  if len(sys.argv) > 1:
    f = open(sys.argv[1], "r")
  else:
    f = sys.stdin
  if not f:
    raise Exception("Could not open input file")
  return f

def match_lto(input_lines):
  match_found = False
  for line in input_lines:
    match = re.match(r"^.*\-flto((?!-fno-lto).)*$", line)
    if match:
      match_found = True
      print(f"{match.group(0)}")
  return match_found

def main():
  input_file = open_input_file()
  input_lines = input_file.readlines()
  if input_file != sys.stdin:
    input_file.close()
  if match_lto(input_lines):
    sys.exit(0)
  sys.exit(1)

main()