Source Code for Module SCons.Scanner.Prog

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 23   
 24  __revision__ = "src/engine/SCons/Scanner/Prog.py 3a41ed6b288cee8d085373ad7fa02894e1903864 2019-01-23 17:30:35 bdeegan" 
 25   
 26  import SCons.Node 
 27  import SCons.Node.FS 
 28  import SCons.Scanner 
 29  import SCons.Util 
 30   
 31  # global, set by --debug=findlibs 
 32  print_find_libs = None 
 33   
 34 -def ProgramScanner(**kw): 
 35      """Return a prototype Scanner instance for scanning executable 
 36      files for static-lib dependencies""" 
 37      kw['path_function'] = SCons.Scanner.FindPathDirs('LIBPATH') 
 38      ps = SCons.Scanner.Base(scan, "ProgramScanner", **kw) 
 39      return ps 
 40   
 41 -def _subst_libs(env, libs): 
 42      """ 
 43      Substitute environment variables and split into list. 
 44      """ 
 45      if SCons.Util.is_String(libs): 
 46          libs = env.subst(libs) 
 47          if SCons.Util.is_String(libs): 
 48              libs = libs.split() 
 49      elif SCons.Util.is_Sequence(libs): 
 50          _libs = [] 
 51          for l in libs: 
 52              _libs += _subst_libs(env, l) 
 53          libs = _libs 
 54      else: 
 55          # libs is an object (Node, for example) 
 56          libs = [libs] 
 57      return libs 
 58   
 59 -def scan(node, env, libpath = ()): 
 60      """ 
 61      This scanner scans program files for static-library 
 62      dependencies.  It will search the LIBPATH environment variable 
 63      for libraries specified in the LIBS variable, returning any 
 64      files it finds as dependencies. 
 65      """ 
 66      try: 
 67          libs = env['LIBS'] 
 68      except KeyError: 
 69          # There are no LIBS in this environment, so just return a null list: 
 70          return [] 
 71   
 72      libs = _subst_libs(env, libs) 
 73   
 74      try: 
 75          prefix = env['LIBPREFIXES'] 
 76          if not SCons.Util.is_List(prefix): 
 77              prefix = [ prefix ] 
 78      except KeyError: 
 79          prefix = [ '' ] 
 80   
 81      try: 
 82          suffix = env['LIBSUFFIXES'] 
 83          if not SCons.Util.is_List(suffix): 
 84              suffix = [ suffix ] 
 85      except KeyError: 
 86          suffix = [ '' ] 
 87   
 88      pairs = [] 
 89      for suf in map(env.subst, suffix): 
 90          for pref in map(env.subst, prefix): 
 91              pairs.append((pref, suf)) 
 92   
 93      result = [] 
 94   
 95      if callable(libpath): 
 96          libpath = libpath() 
 97   
 98      find_file = SCons.Node.FS.find_file 
 99      adjustixes = SCons.Util.adjustixes 
100      for lib in libs: 
101          if SCons.Util.is_String(lib): 
102              for pref, suf in pairs: 
103                  l = adjustixes(lib, pref, suf) 
104                  l = find_file(l, libpath, verbose=print_find_libs) 
105                  if l: 
106                      result.append(l) 
107          else: 
108              result.append(lib) 
109   
110      return result 
111   
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117