1  import argparse
       2  import subprocess
       3  import json
       4  import os
       5  import re
       6  
       7  if __name__== '__main__':
       8      parser = argparse.ArgumentParser()
       9      parser.add_argument('input')
      10      parser.add_argument('output')
      11      parser.add_argument('buildroot')
      12  
      13      args = parser.parse_known_args()
      14  
      15      # c_args might contain things that are essential for crosscompilation, but
      16      # are not included in cc.cmd_array(), so we have to look them up ourselves
      17      host_cargs = []
      18      buildroot = args[0].buildroot
      19      with open(os.path.join(buildroot, 'meson-info', 'intro-buildoptions.json')) as json_file:
      20          bopts = json.load(json_file)
      21          for opt in bopts:
      22              if opt['name'] == 'c_args' and opt['section'] == 'compiler' and opt['machine'] == 'host':
      23                  host_cargs = opt['value']
      24                  break
      25  
      26      cpp = args[1]
      27      cpp_args = [i for i in host_cargs + [args[0].input] if not i.startswith('-g')]
      28      ret = subprocess.run(cpp + cpp_args, stdout=subprocess.PIPE, check=True)
      29  
      30      stdout = ret.stdout.decode('utf8')
      31  
      32      with open(args[0].output, 'w') as out:
      33          write = True
      34          for l in stdout.split('\n'):
      35              l = l.strip('\r')
      36              if l.startswith('CUT_OUT_BEGIN'):
      37                  write = False
      38  
      39              if write and l:
      40                  stripped = re.sub('^\s+', '', l)
      41                  stripped = re.sub('\s*,\s*', ',', stripped)
      42                  if not stripped.isspace() and stripped:
      43                      out.write('%s\n' % stripped)
      44  
      45              if l.startswith('CUT_OUT_END'):
      46                  write = True