Mercurial > cpython-lru_cache-weakref

annotate Lib/distutils/command/config.py @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 6240ff5dfebe
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 __revision__ = "$Id$"
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13
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14 import os
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15 import re
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16
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17 from distutils.core import Command
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18 from distutils.errors import DistutilsExecError
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19 from distutils.sysconfig import customize_compiler
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20 from distutils import log
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21
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22 LANG_EXT = {'c': '.c', 'c++': '.cxx'}
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23
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24 class config(Command):
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25
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26 description = "prepare to build"
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27
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28 user_options = [
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29 ('compiler=', None,
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30 "specify the compiler type"),
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31 ('cc=', None,
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32 "specify the compiler executable"),
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33 ('include-dirs=', 'I',
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34 "list of directories to search for header files"),
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35 ('define=', 'D',
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36 "C preprocessor macros to define"),
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37 ('undef=', 'U',
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38 "C preprocessor macros to undefine"),
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39 ('libraries=', 'l',
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40 "external C libraries to link with"),
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41 ('library-dirs=', 'L',
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42 "directories to search for external C libraries"),
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43
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44 ('noisy', None,
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45 "show every action (compile, link, run, ...) taken"),
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46 ('dump-source', None,
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47 "dump generated source files before attempting to compile them"),
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48 ]
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49
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50
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51 # The three standard command methods: since the "config" command
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52 # does nothing by default, these are empty.
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53
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54 def initialize_options(self):
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55 self.compiler = None
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56 self.cc = None
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57 self.include_dirs = None
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58 self.libraries = None
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59 self.library_dirs = None
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60
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61 # maximal output for now
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62 self.noisy = 1
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63 self.dump_source = 1
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64
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65 # list of temporary files generated along-the-way that we have
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66 # to clean at some point
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67 self.temp_files = []
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68
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69 def finalize_options(self):
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70 if self.include_dirs is None:
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71 self.include_dirs = self.distribution.include_dirs or []
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72 elif isinstance(self.include_dirs, str):
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73 self.include_dirs = self.include_dirs.split(os.pathsep)
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74
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75 if self.libraries is None:
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76 self.libraries = []
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77 elif isinstance(self.libraries, str):
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78 self.libraries = [self.libraries]
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79
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80 if self.library_dirs is None:
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81 self.library_dirs = []
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82 elif isinstance(self.library_dirs, str):
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83 self.library_dirs = self.library_dirs.split(os.pathsep)
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84
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85 def run(self):
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86 pass
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87
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88
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89 # Utility methods for actual "config" commands. The interfaces are
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90 # loosely based on Autoconf macros of similar names. Sub-classes
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91 # may use these freely.
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92
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93 def _check_compiler(self):
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94 """Check that 'self.compiler' really is a CCompiler object;
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95 if not, make it one.
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96 """
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97 # We do this late, and only on-demand, because this is an expensive
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98 # import.
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99 from distutils.ccompiler import CCompiler, new_compiler
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100 if not isinstance(self.compiler, CCompiler):
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101 self.compiler = new_compiler(compiler=self.compiler,
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102 dry_run=self.dry_run, force=1)
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103 customize_compiler(self.compiler)
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104 if self.include_dirs:
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105 self.compiler.set_include_dirs(self.include_dirs)
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106 if self.libraries:
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107 self.compiler.set_libraries(self.libraries)
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108 if self.library_dirs:
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109 self.compiler.set_library_dirs(self.library_dirs)
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110
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111
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112 def _gen_temp_sourcefile(self, body, headers, lang):
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113 filename = "_configtest" + LANG_EXT[lang]
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114 file = open(filename, "w")
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115 if headers:
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116 for header in headers:
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117 file.write("#include <%s>\n" % header)
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118 file.write("\n")
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119 file.write(body)
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120 if body[-1] != "\n":
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121 file.write("\n")
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122 file.close()
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123 return filename
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124
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125 def _preprocess(self, body, headers, include_dirs, lang):
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126 src = self._gen_temp_sourcefile(body, headers, lang)
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127 out = "_configtest.i"
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128 self.temp_files.extend([src, out])
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129 self.compiler.preprocess(src, out, include_dirs=include_dirs)
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130 return (src, out)
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131
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132 def _compile(self, body, headers, include_dirs, lang):
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133 src = self._gen_temp_sourcefile(body, headers, lang)
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134 if self.dump_source:
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135 dump_file(src, "compiling '%s':" % src)
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136 (obj,) = self.compiler.object_filenames([src])
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137 self.temp_files.extend([src, obj])
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138 self.compiler.compile([src], include_dirs=include_dirs)
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139 return (src, obj)
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140
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141 def _link(self, body, headers, include_dirs, libraries, library_dirs,
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142 lang):
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143 (src, obj) = self._compile(body, headers, include_dirs, lang)
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144 prog = os.path.splitext(os.path.basename(src))[0]
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145 self.compiler.link_executable([obj], prog,
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146 libraries=libraries,
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147 library_dirs=library_dirs,
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148 target_lang=lang)
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149
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150 if self.compiler.exe_extension is not None:
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151 prog = prog + self.compiler.exe_extension
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152 self.temp_files.append(prog)
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153
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154 return (src, obj, prog)
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155
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156 def _clean(self, *filenames):
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157 if not filenames:
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158 filenames = self.temp_files
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159 self.temp_files = []
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160 log.info("removing: %s", ' '.join(filenames))
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161 for filename in filenames:
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162 try:
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163 os.remove(filename)
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164 except OSError:
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165 pass
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166
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167
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168 # XXX these ignore the dry-run flag: what to do, what to do? even if
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169 # you want a dry-run build, you still need some sort of configuration
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170 # info. My inclination is to make it up to the real config command to
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171 # consult 'dry_run', and assume a default (minimal) configuration if
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172 # true. The problem with trying to do it here is that you'd have to
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173 # return either true or false from all the 'try' methods, neither of
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174 # which is correct.
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175
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176 # XXX need access to the header search path and maybe default macros.
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177
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178 def try_cpp(self, body=None, headers=None, include_dirs=None, lang="c"):
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179 """Construct a source file from 'body' (a string containing lines
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180 of C/C++ code) and 'headers' (a list of header files to include)
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181 and run it through the preprocessor. Return true if the
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182 preprocessor succeeded, false if there were any errors.
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183 ('body' probably isn't of much use, but what the heck.)
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184 """
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185 from distutils.ccompiler import CompileError
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186 self._check_compiler()
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187 ok = 1
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188 try:
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189 self._preprocess(body, headers, include_dirs, lang)
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190 except CompileError:
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191 ok = 0
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192
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193 self._clean()
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194 return ok
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195
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196 def search_cpp(self, pattern, body=None, headers=None, include_dirs=None,
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197 lang="c"):
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198 """Construct a source file (just like 'try_cpp()'), run it through
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199 the preprocessor, and return true if any line of the output matches
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200 'pattern'. 'pattern' should either be a compiled regex object or a
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201 string containing a regex. If both 'body' and 'headers' are None,
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202 preprocesses an empty file -- which can be useful to determine the
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203 symbols the preprocessor and compiler set by default.
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204 """
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205 self._check_compiler()
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206 src, out = self._preprocess(body, headers, include_dirs, lang)
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207
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208 if isinstance(pattern, str):
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209 pattern = re.compile(pattern)
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210
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211 file = open(out)
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212 match = 0
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213 while 1:
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214 line = file.readline()
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215 if line == '':
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216 break
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217 if pattern.search(line):
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218 match = 1
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219 break
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220
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221 file.close()
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222 self._clean()
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223 return match
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224
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225 def try_compile(self, body, headers=None, include_dirs=None, lang="c"):
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226 """Try to compile a source file built from 'body' and 'headers'.
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227 Return true on success, false otherwise.
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228 """
31d0988da8a9 First crack at the Distutils "config" command. Unlike other commands, this
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229 from distutils.ccompiler import CompileError
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230 self._check_compiler()
31d0988da8a9 First crack at the Distutils "config" command. Unlike other commands, this
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231 try:
19302
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232 self._compile(body, headers, include_dirs, lang)
12864
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233 ok = 1
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234 except CompileError:
31d0988da8a9 First crack at the Distutils "config" command. Unlike other commands, this
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235 ok = 0
31d0988da8a9 First crack at the Distutils "config" command. Unlike other commands, this
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236
23668
ca87119255eb Make setup.py less chatty by default.
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237 log.info(ok and "success!" or "failure.")
12979
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238 self._clean()
12864
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239 return ok
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240
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241 def try_link(self, body, headers=None, include_dirs=None, libraries=None,
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242 library_dirs=None, lang="c"):
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243 """Try to compile and link a source file, built from 'body' and
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244 'headers', to executable form. Return true on success, false
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diff changeset
245 otherwise.
12864
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246 """
31d0988da8a9 First crack at the Distutils "config" command. Unlike other commands, this
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247 from distutils.ccompiler import CompileError, LinkError
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248 self._check_compiler()
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249 try:
13029
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250 self._link(body, headers, include_dirs,
70b16dc6137f Added 'include_dirs' parameters all over the place.
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parents: 12979
diff changeset
251 libraries, library_dirs, lang)
12864
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diff changeset
252 ok = 1
31d0988da8a9 First crack at the Distutils "config" command. Unlike other commands, this
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253 except (CompileError, LinkError):
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254 ok = 0
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255
23668
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256 log.info(ok and "success!" or "failure.")
12979
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257 self._clean()
12864
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258 return ok
21268
d296e6bb17e5 Whitespace normalization.
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diff changeset
259
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260 def try_run(self, body, headers=None, include_dirs=None, libraries=None,
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261 library_dirs=None, lang="c"):
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262 """Try to compile, link to an executable, and run a program
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263 built from 'body' and 'headers'. Return true on success, false
12864
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diff changeset
264 otherwise.
31d0988da8a9 First crack at the Distutils "config" command. Unlike other commands, this
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265 """
31d0988da8a9 First crack at the Distutils "config" command. Unlike other commands, this
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266 from distutils.ccompiler import CompileError, LinkError
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267 self._check_compiler()
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268 try:
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269 src, obj, exe = self._link(body, headers, include_dirs,
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270 libraries, library_dirs, lang)
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271 self.spawn([exe])
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272 ok = 1
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273 except (CompileError, LinkError, DistutilsExecError):
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274 ok = 0
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275
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276 log.info(ok and "success!" or "failure.")
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277 self._clean()
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278 return ok
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279
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280
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281 # -- High-level methods --------------------------------------------
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282 # (these are the ones that are actually likely to be useful
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283 # when implementing a real-world config command!)
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284
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285 def check_func(self, func, headers=None, include_dirs=None,
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286 libraries=None, library_dirs=None, decl=0, call=0):
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287
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288 """Determine if function 'func' is available by constructing a
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289 source file that refers to 'func', and compiles and links it.
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290 If everything succeeds, returns true; otherwise returns false.
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291
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292 The constructed source file starts out by including the header
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293 files listed in 'headers'. If 'decl' is true, it then declares
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294 'func' (as "int func()"); you probably shouldn't supply 'headers'
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295 and set 'decl' true in the same call, or you might get errors about
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296 a conflicting declarations for 'func'. Finally, the constructed
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297 'main()' function either references 'func' or (if 'call' is true)
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298 calls it. 'libraries' and 'library_dirs' are used when
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299 linking.
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300 """
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301
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302 self._check_compiler()
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303 body = []
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304 if decl:
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305 body.append("int %s ();" % func)
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306 body.append("int main () {")
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307 if call:
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308 body.append(" %s();" % func)
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309 else:
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310 body.append(" %s;" % func)
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311 body.append("}")
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312 body = "\n".join(body) + "\n"
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313
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314 return self.try_link(body, headers, include_dirs,
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315 libraries, library_dirs)
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316
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317 # check_func ()
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318
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319 def check_lib(self, library, library_dirs=None, headers=None,
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320 include_dirs=None, other_libraries=[]):
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321 """Determine if 'library' is available to be linked against,
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322 without actually checking that any particular symbols are provided
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323 by it. 'headers' will be used in constructing the source file to
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324 be compiled, but the only effect of this is to check if all the
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325 header files listed are available. Any libraries listed in
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326 'other_libraries' will be included in the link, in case 'library'
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327 has symbols that depend on other libraries.
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328 """
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329 self._check_compiler()
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330 return self.try_link("int main (void) { }",
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331 headers, include_dirs,
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332 [library]+other_libraries, library_dirs)
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333
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334 def check_header(self, header, include_dirs=None, library_dirs=None,
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335 lang="c"):
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336 """Determine if the system header file named by 'header_file'
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337 exists and can be found by the preprocessor; return true if so,
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338 false otherwise.
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339 """
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340 return self.try_cpp(body="/* No body */", headers=[header],
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341 include_dirs=include_dirs)
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342
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343
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344 def dump_file(filename, head=None):
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345 """Dumps a file content into log.info.
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346
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347 If head is not None, will be dumped before the file content.
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348 """
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349 if head is None:
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350 log.info('%s' % filename)
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351 else:
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352 log.info(head)
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353 file = open(filename)
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354 try:
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355 log.info(file.read())
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356 finally:
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357 file.close()