Mercurial > cpython-lru_cache-weakref

annotate Lib/distutils/command/config.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 0c44fa04f533
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """distutils.command.config
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2
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3 Implements the Distutils 'config' command, a (mostly) empty command class
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4 that exists mainly to be sub-classed by specific module distributions and
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5 applications. The idea is that while every "config" command is different,
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6 at least they're all named the same, and users always see "config" in the
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7 list of standard commands. Also, this is a good place to put common
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8 configure-like tasks: "try to compile this C code", or "figure out where
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9 this header file lives".
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10 """
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11
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12 # created 2000/05/29, Greg Ward
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13
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14 __revision__ = "$Id$"
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15
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16 import sys, os, string, re
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17 from types import *
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18 from distutils.core import Command
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19 from distutils.errors import DistutilsExecError
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20
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21
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22 LANG_EXT = {'c': '.c',
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23 'c++': '.cxx'}
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24
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25 class config (Command):
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26
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27 description = "prepare to build"
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28
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29 user_options = [
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30 ('compiler=', None,
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31 "specify the compiler type"),
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32 ('cc=', None,
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33 "specify the compiler executable"),
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34 ('include-dirs=', 'I',
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35 "list of directories to search for header files"),
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36 ('define=', 'D',
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37 "C preprocessor macros to define"),
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38 ('undef=', 'U',
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39 "C preprocessor macros to undefine"),
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40 ('libraries=', 'l',
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41 "external C libraries to link with"),
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42 ('library-dirs=', 'L',
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43 "directories to search for external C libraries"),
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44
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45 ('noisy', None,
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46 "show every action (compile, link, run, ...) taken"),
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47 ('dump-source', None,
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48 "dump generated source files before attempting to compile them"),
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49 ]
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50
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51
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52 # The three standard command methods: since the "config" command
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53 # does nothing by default, these are empty.
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54
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55 def initialize_options (self):
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56 self.compiler = None
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57 self.cc = None
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58 self.include_dirs = None
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59 #self.define = None
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60 #self.undef = None
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61 self.libraries = None
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62 self.library_dirs = None
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63
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64 # maximal output for now
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65 self.noisy = 1
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66 self.dump_source = 1
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67
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68 # list of temporary files generated along-the-way that we have
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69 # to clean at some point
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70 self.temp_files = []
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71
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72 def finalize_options (self):
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73 if self.include_dirs is None:
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74 self.include_dirs = self.distribution.include_dirs or []
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75 elif type(self.include_dirs) is StringType:
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76 self.include_dirs = string.split(self.include_dirs, os.pathsep)
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77
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78 if self.libraries is None:
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79 self.libraries = []
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80 elif type(self.libraries) is StringType:
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81 self.libraries = [self.libraries]
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82
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83 if self.library_dirs is None:
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84 self.library_dirs = []
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85 elif type(self.library_dirs) is StringType:
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86 self.library_dirs = string.split(self.library_dirs, os.pathsep)
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87
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88
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89 def run (self):
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90 pass
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91
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92
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93 # Utility methods for actual "config" commands. The interfaces are
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94 # loosely based on Autoconf macros of similar names. Sub-classes
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95 # may use these freely.
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96
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97 def _check_compiler (self):
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98 """Check that 'self.compiler' really is a CCompiler object;
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99 if not, make it one.
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100 """
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101 # We do this late, and only on-demand, because this is an expensive
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102 # import.
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103 from distutils.ccompiler import CCompiler, new_compiler
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104 if not isinstance(self.compiler, CCompiler):
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105 self.compiler = new_compiler(compiler=self.compiler,
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106 verbose=self.noisy,
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107 dry_run=self.dry_run,
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108 force=1)
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109 if self.include_dirs:
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110 self.compiler.set_include_dirs(self.include_dirs)
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111 if self.libraries:
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112 self.compiler.set_libraries(self.libraries)
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113 if self.library_dirs:
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114 self.compiler.set_library_dirs(self.library_dirs)
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115
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116
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117 def _gen_temp_sourcefile (self, body, headers, lang):
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118 filename = "_configtest" + LANG_EXT[lang]
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119 file = open(filename, "w")
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120 if headers:
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121 for header in headers:
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122 file.write("#include <%s>\n" % header)
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123 file.write("\n")
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124 file.write(body)
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125 if body[-1] != "\n":
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126 file.write("\n")
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127 file.close()
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128 return filename
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129
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130 def _preprocess (self, body, headers, include_dirs, lang):
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131 src = self._gen_temp_sourcefile(body, headers, lang)
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132 out = "_configtest.i"
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133 self.temp_files.extend([src, out])
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134 self.compiler.preprocess(src, out, include_dirs=include_dirs)
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135 return (src, out)
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136
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137 def _compile (self, body, headers, include_dirs, lang):
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138 src = self._gen_temp_sourcefile(body, headers, lang)
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139 if self.dump_source:
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140 dump_file(src, "compiling '%s':" % src)
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141 (obj,) = self.compiler.object_filenames([src])
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142 self.temp_files.extend([src, obj])
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143 self.compiler.compile([src], include_dirs=include_dirs)
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144 return (src, obj)
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145
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146 def _link (self, body,
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147 headers, include_dirs,
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148 libraries, library_dirs, lang):
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149 (src, obj) = self._compile(body, headers, include_dirs, lang)
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150 prog = os.path.splitext(os.path.basename(src))[0]
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151 self.compiler.link_executable([obj], prog,
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152 libraries=libraries,
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153 library_dirs=library_dirs)
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154
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155 prog = prog + self.compiler.exe_extension
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156 self.temp_files.append(prog)
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157
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158 return (src, obj, prog)
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159
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160 def _clean (self, *filenames):
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161 if not filenames:
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162 filenames = self.temp_files
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163 self.temp_files = []
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164 self.announce("removing: " + string.join(filenames))
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165 for filename in filenames:
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166 try:
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167 os.remove(filename)
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168 except OSError:
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169 pass
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170
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171
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172 # XXX these ignore the dry-run flag: what to do, what to do? even if
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173 # you want a dry-run build, you still need some sort of configuration
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174 # info. My inclination is to make it up to the real config command to
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175 # consult 'dry_run', and assume a default (minimal) configuration if
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176 # true. The problem with trying to do it here is that you'd have to
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177 # return either true or false from all the 'try' methods, neither of
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178 # which is correct.
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179
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180 # XXX need access to the header search path and maybe default macros.
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181
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182 def try_cpp (self, body=None, headers=None, include_dirs=None, lang="c"):
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183 """Construct a source file from 'body' (a string containing lines
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184 of C/C++ code) and 'headers' (a list of header files to include)
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185 and run it through the preprocessor. Return true if the
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186 preprocessor succeeded, false if there were any errors.
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187 ('body' probably isn't of much use, but what the heck.)
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188 """
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189 from distutils.ccompiler import CompileError
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190 self._check_compiler()
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191 ok = 1
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192 try:
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193 self._preprocess(body, headers, include_dirs, lang)
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194 except CompileError:
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195 ok = 0
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196
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197 self._clean()
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198 return ok
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199
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200 def search_cpp (self, pattern, body=None,
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201 headers=None, include_dirs=None, lang="c"):
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202 """Construct a source file (just like 'try_cpp()'), run it through
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203 the preprocessor, and return true if any line of the output matches
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204 'pattern'. 'pattern' should either be a compiled regex object or a
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205 string containing a regex. If both 'body' and 'headers' are None,
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206 preprocesses an empty file -- which can be useful to determine the
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207 symbols the preprocessor and compiler set by default.
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208 """
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209
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210 self._check_compiler()
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211 (src, out) = self._preprocess(body, headers, include_dirs, lang)
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212
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213 if type(pattern) is StringType:
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214 pattern = re.compile(pattern)
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215
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216 file = open(out)
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217 match = 0
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218 while 1:
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219 line = file.readline()
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220 if line == '':
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221 break
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222 if pattern.search(line):
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223 match = 1
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224 break
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225
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226 file.close()
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227 self._clean()
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228 return match
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229
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230 def try_compile (self, body, headers=None, include_dirs=None, lang="c"):
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231 """Try to compile a source file built from 'body' and 'headers'.
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232 Return true on success, false otherwise.
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233 """
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234 from distutils.ccompiler import CompileError
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235 self._check_compiler()
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236 try:
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237 self._compile(body, headers, include_dirs, lang)
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238 ok = 1
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239 except CompileError:
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240 ok = 0
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241
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242 self.announce(ok and "success!" or "failure.")
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243 self._clean()
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244 return ok
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245
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246 def try_link (self, body,
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247 headers=None, include_dirs=None,
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248 libraries=None, library_dirs=None,
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249 lang="c"):
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250 """Try to compile and link a source file, built from 'body' and
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251 'headers', to executable form. Return true on success, false
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252 otherwise.
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253 """
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254 from distutils.ccompiler import CompileError, LinkError
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255 self._check_compiler()
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256 try:
13029
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257 self._link(body, headers, include_dirs,
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258 libraries, library_dirs, lang)
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259 ok = 1
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260 except (CompileError, LinkError):
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261 ok = 0
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262
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263 self.announce(ok and "success!" or "failure.")
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264 self._clean()
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265 return ok
21268
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diff changeset
266
13029
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267 def try_run (self, body,
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268 headers=None, include_dirs=None,
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269 libraries=None, library_dirs=None,
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270 lang="c"):
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271 """Try to compile, link to an executable, and run a program
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272 built from 'body' and 'headers'. Return true on success, false
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273 otherwise.
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274 """
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275 from distutils.ccompiler import CompileError, LinkError
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276 self._check_compiler()
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277 try:
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278 src, obj, exe = self._link(body, headers, include_dirs,
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279 libraries, library_dirs, lang)
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280 self.spawn([exe])
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281 ok = 1
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282 except (CompileError, LinkError, DistutilsExecError):
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283 ok = 0
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284
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285 self.announce(ok and "success!" or "failure.")
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286 self._clean()
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287 return ok
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288
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289
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290 # -- High-level methods --------------------------------------------
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291 # (these are the ones that are actually likely to be useful
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292 # when implementing a real-world config command!)
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293
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294 def check_func (self, func,
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295 headers=None, include_dirs=None,
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296 libraries=None, library_dirs=None,
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297 decl=0, call=0):
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298
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299 """Determine if function 'func' is available by constructing a
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300 source file that refers to 'func', and compiles and links it.
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301 If everything succeeds, returns true; otherwise returns false.
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302
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303 The constructed source file starts out by including the header
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304 files listed in 'headers'. If 'decl' is true, it then declares
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305 'func' (as "int func()"); you probably shouldn't supply 'headers'
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306 and set 'decl' true in the same call, or you might get errors about
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307 a conflicting declarations for 'func'. Finally, the constructed
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308 'main()' function either references 'func' or (if 'call' is true)
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309 calls it. 'libraries' and 'library_dirs' are used when
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310 linking.
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311 """
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312
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313 self._check_compiler()
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314 body = []
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315 if decl:
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316 body.append("int %s ();" % func)
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317 body.append("int main () {")
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318 if call:
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319 body.append(" %s();" % func)
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320 else:
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321 body.append(" %s;" % func)
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322 body.append("}")
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323 body = string.join(body, "\n") + "\n"
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324
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325 return self.try_link(body, headers, include_dirs,
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326 libraries, library_dirs)
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327
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328 # check_func ()
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329
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330 def check_lib (self, library, library_dirs=None,
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331 headers=None, include_dirs=None, other_libraries=[]):
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332 """Determine if 'library' is available to be linked against,
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333 without actually checking that any particular symbols are provided
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334 by it. 'headers' will be used in constructing the source file to
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335 be compiled, but the only effect of this is to check if all the
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336 header files listed are available. Any libraries listed in
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337 'other_libraries' will be included in the link, in case 'library'
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338 has symbols that depend on other libraries.
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339 """
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340 self._check_compiler()
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341 return self.try_link("int main (void) { }",
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342 headers, include_dirs,
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343 [library]+other_libraries, library_dirs)
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344
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345 def check_header (self, header, include_dirs=None,
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346 library_dirs=None, lang="c"):
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347 """Determine if the system header file named by 'header_file'
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348 exists and can be found by the preprocessor; return true if so,
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349 false otherwise.
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350 """
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351 return self.try_cpp(body="/* No body */", headers=[header],
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352 include_dirs=include_dirs)
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353
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354
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355 # class config
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356
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357
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358 def dump_file (filename, head=None):
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359 if head is None:
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360 print filename + ":"
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361 else:
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362 print head
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363
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364 file = open(filename)
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365 sys.stdout.write(file.read())
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366 file.close()