configure

   1 #!/usr/bin/env python
   2 #
   3 # This is simple script to detect libraries and configure standard features.
   4 #
   5 import os
   6 import sys
   7 from optparse import OptionParser
   8 from subprocess import check_output
   9
  10 def header_exists(cfg, filename):
  11     fpath = cfg['include_path'][0] + '/' + filename
  12
  13     sys.stderr.write("Checking for '%s' ... " % fpath)
  14
  15     try:
  16         st = os.stat(fpath)
  17         sys.stderr.write("Yes\n")
  18         return True
  19     except os.error:
  20         sys.stderr.write("No\n")
  21         return False
  22
  23 def c_try_compile(cfg, code, msg):
  24     sys.stderr.write(msg)
  25
  26     ret = os.system("echo '%s' | %s -x c -o /dev/null - > /dev/null 2>&1" %
  27                     (code, cfg["CC"][0]))
  28
  29     if ret:
  30         sys.stderr.write("No\n")
  31         return False
  32     else:
  33         sys.stderr.write("Yes\n")
  34         return True
  35
  36 def c_compiler_exists(cfg):
  37     return c_try_compile(cfg, "int main(void) { return 0; }",
  38                          "Checking for working compiler (%s) ... " %
  39                          cfg["CC"][0])
  40
  41 def python_version(cfg):
  42     sys.stderr.write("Cddhecking for python-config Python version ... ")
  43
  44     if (cfg['PYTHON_CONFIG'][0] is ''):
  45         sys.stderr.write('NA\n')
  46         return ''
  47
  48     res = str(check_output("%s --ldflags" % cfg['PYTHON_CONFIG'][0], shell=True))
  49     res = res[res.find('-lpython')+8:]
  50     res = res[:3]
  51
  52     sys.stderr.write("%s\n" % res)
  53     return res
  54
  55 def python_module_installed(cfg, module):
  56     sys.stderr.write("Checking for python module %s ... " % module)
  57
  58     ret = os.system("echo 'import %s' | %s > /dev/null 2>&1" %
  59                     (module, cfg['PYTHON_BIN'][0]))
  60
  61     if ret:
  62         sys.stderr.write('No\n')
  63         return False
  64     else:
  65         sys.stderr.write('Yes\n')
  66         return True
  67
  68 def check_for_swig(cfg):
  69     sys.stderr.write("Checking for working swig ... ")
  70
  71     ret = os.system("%s -version > /dev/null 2>&1" % cfg['SWIG'][0])
  72
  73     if ret:
  74         sys.stderr.write('No\n')
  75         cfg['SWIG'][0] = ''
  76     else:
  77         sys.stderr.write('Yes\n')
  78
  79 def check_for_python_config(cfg):
  80     sys.stderr.write("Checking for python-config ... ")
  81
  82     ret = os.system("%s --libs > /dev/null 2>&1" % cfg['PYTHON_CONFIG'][0])
  83
  84     if ret:
  85         sys.stderr.write('No\n')
  86         cfg['PYTHON_CONFIG'][0] = ''
  87     else:
  88         sys.stderr.write('Yes\n')
  89
  90 #
  91 # Library checking api
  92 #
  93 class libraries:
  94     def __init__(self, libraries, cfg):
  95         self.libraries = libraries
  96         self.cfg = cfg;
  97         # Create dictionary for check results
  98         self.results = dict()
  99     #
 100     # Print summary
 101     #
 102     def print_summary(self):
 103         sys.stderr.write("Settings and variables\n")
 104         sys.stderr.write("----------------------\n")
 105
 106         for i in cfg:
 107             sys.stderr.write("%14s : %s\n" % (i, cfg[i][0]))
 108             sys.stderr.write("              - %s\n\n" % cfg[i][1])
 109
 110         sys.stderr.write("Libraries to link against\n")
 111         sys.stderr.write("-------------------------\n")
 112
 113         for i in self.libraries:
 114             sys.stderr.write("%10s" % i[0])
 115
 116             if (self.results[i[0]]):
 117                 sys.stderr.write(" : Enabled\n")
 118             else:
 119                 sys.stderr.write(" : Disabled\n")
 120
 121             sys.stderr.write("          - %s\n\n" % i[1])
 122     #
 123     # Enable/Disable library
 124     #
 125     def set(self, name, val):
 126         if name not in map(lambda s: s[0], self.libraries):
 127             sys.stderr.write("ERROR: Invalid library '%s'\n" % name)
 128             exit(1)
 129         else:
 130             self.results[name] = val
 131     #
 132     # Calls a function on arguments, all is stored in array if
 133     # not set previously
 134     # (I know this smells like a lisp, but I can't help myself)
 135     #
 136     def check(self):
 137         sys.stderr.write("Checking for libraries\n")
 138         sys.stderr.write("----------------------\n")
 139         for i in self.libraries:
 140             if i[0] not in self.results:
 141                 self.results[i[0]] = i[2][0](self.cfg, *i[2][1:])
 142         sys.stderr.write("\n")
 143     #
 144     # Writes '#define HAVE_XXX_H' into passed file
 145     #
 146     def write_config_h(self, f):
 147         for i in self.libraries:
 148             f.write("/*\n * %s\n */\n" % i[1])
 149             if self.results[i[0]]:
 150                 f.write("#define HAVE_%s\n" % i[0].upper())
 151             else:
 152                 f.write("//#define HAVE_%s\n" % i[0].upper())
 153             f.write("\n")
 154
 155     #
 156     # Writes LDLIBS and CFLAGS into passed file
 157     #
 158     def write_config_mk(self, f):
 159         for i in self.libraries:
 160             f.write("# %s - %s\n" % (i[0], i[1]))
 161             if self.results[i[0]]:
 162                 f.write("HAVE_%s=yes\n" % i[0].upper())
 163                 f.write("CFLAGS+=%s\nLDLIBS+=%s\n" % (i[3], i[4]))
 164             else:
 165                 f.write("HAVE_%s=no\n" % i[0].upper())
 166
 167     #
 168     # Return list of linker flags needed to build particular module
 169     # (module may be core, loaders, backends, etc...
 170     #
 171     def get_linker_flags(self, module):
 172         res = ''
 173         for i in self.libraries:
 174             if module in i[5] and self.results[i[0]]:
 175                 res += ' ' + i[4]
 176         return res
 177     #
 178     # Returns list of cflags needed to build module
 179     #
 180     def get_cflags(self, module):
 181         res = ''
 182         for i in self.libraries:
 183             if module in i[5] and self.results[i[0]]:
 184                 res += ' ' + i[3]
 185         return res
 186
 187 def die_screaming(msg):
 188     sys.stderr.write("\n************************************\n")
 189     sys.stderr.write("ERROR: ")
 190     sys.stderr.write(msg)
 191     sys.stderr.write("\n************************************\n")
 192     exit(1)
 193
 194 #
 195 # Check for basic compiling tools
 196 #
 197 def basic_checks(cfg):
 198     sys.stderr.write("Basic checks\n")
 199     sys.stderr.write("------------\n")
 200
 201     if not c_compiler_exists(cfg):
 202         die_screaming("No C compiler found")
 203
 204     if not python_module_installed(cfg, 'jinja2'):
 205         die_screaming("No jinja2 python module found")
 206
 207     check_for_swig(cfg)
 208     check_for_python_config(cfg)
 209
 210     cfg['PYTHON_VER'][0] = python_version(cfg)
 211
 212     sys.stderr.write("\n")
 213
 214 #
 215 # Write configuration files
 216 #
 217 def write_config_h(cfg, libs):
 218     f = open("config.h", "w")
 219     f.write("/*\n * This file is genereated by configure script\n */\n");
 220     f.write("#ifndef CONFIG_H\n#define CONFIG_H\n\n")
 221     libs.write_config_h(f);
 222     f.write("#endif /* CONFIG_H */\n");
 223     sys.stderr.write("Config 'config.h' written\n")
 224     f.close()
 225
 226 def write_config_mk(cfg, libs):
 227     f = open('config.gen.mk', 'w')
 228     for i in cfg:
 229         f.write("# %s\n%s=%s\n" % (cfg[i][1], i, cfg[i][0]))
 230     libs.write_config_mk(f);
 231     f.close()
 232     sys.stderr.write("Config 'config.gen.mk' written\n")
 233
 234 #
 235 # Generate app compilation helper
 236 #
 237 def write_gfxprim_config(cfg, libs):
 238     modules = ['loaders', 'backends', 'grabbers']
 239
 240     f = open('gfxprim-config', 'w')
 241     f.write('#!/bin/sh\n'
 242             '#\n# Generated by configure, do not edit directly\n#\n\n'
 243             'USAGE="Usage: $0 --list-modules --cflags --libs --libs-module_foo"\n'
 244             '\nif test $# -eq 0; then\n'
 245             '\techo "$USAGE"\n'
 246             '\texit 1\n'
 247             'fi\n\n'
 248             'while test -n "$1"; do\n'
 249             '\tcase "$1" in\n')
 250
 251     # General switches cflags and ldflags
 252     f.write('\t--help) echo "$USAGE"; exit 0;;\n')
 253     f.write('\t--list-modules) echo "%s"; exit 0;;\n' % ' '.join(modules))
 254     f.write('\t--cflags) echo -n "-I/usr/include/GP/%s";;\n' %
 255             libs.get_cflags('core'))
 256     f.write('\t--libs) echo -n "-lGP %s ";;\n' % libs.get_linker_flags('core'))
 257
 258     # ldflags for specific modules
 259     for i in modules:
 260         ldflags = ''
 261         if i == 'backends':
 262             ldflags += '-lGP_backends '
 263         if i == 'grabbers':
 264             ldflags += '-lGP_grabbers '
 265         ldflags += libs.get_linker_flags(i)
 266         f.write('\t--libs-%s) echo -n "%s ";;\n' % (i, ldflags))
 267
 268     f.write('\t*) echo "Invalid option \'$1\'"; echo $USAGE; exit 1;;\n')
 269
 270     f.write('\tesac\n\tshift\ndone\necho\n')
 271     f.close()
 272     os.system('chmod +x gfxprim-config')
 273
 274 if __name__ ==  '__main__':
 275     #
 276     # Dictionary for default configuration parameters
 277     #
 278     cfg = {'CC'            : ['gcc', 'Path/name of the C compiler'],
 279            'CFLAGS'        : ['-pthread -W -Wall -Wextra -fPIC -O2 -ggdb -D_FORTIFY_SOURCE=2', 'C compiler flags'],
 280            'PYTHON_BIN'    : ['python', 'Path/name of python interpreter'],
 281            'SWIG'          : ['swig', 'Simplified Wrapper and Interface Generator'],
 282            'PYTHON_CONFIG' : ['python-config', 'Python config helper'],
 283            'PYTHON_VER'    : ['', 'Python version (derived from python config)'],
 284            'include_path'  : ['/usr/include', 'Path to the system headers'],
 285            'prefix'        : ['/usr', 'Installation prefix']}
 286
 287     #
 288     # Library detection/enable disable
 289     #
 290     # name, description, [detection], cflags, ldflags, list of modules library is needed for
 291     #
 292     l = libraries([["libpng",
 293                     "Portable Network Graphics Library",
 294                     [header_exists, "png.h"], "", "-lpng", ["loaders"]],
 295                    ["libsdl",
 296                     "Simple Direct Media Layer",
 297                     [header_exists, "SDL/SDL.h"], "", "`sdl-config --libs`", ["backends"]],
 298                    ["jpeg",
 299                     "Library to load, handle and manipulate images in the JPEG format",
 300                     [header_exists, "jpeglib.h"], "", "-ljpeg", ["loaders"]],
 301                    ["giflib",
 302                     "Library to handle, display and manipulate GIF images",
 303                     [header_exists, "gif_lib.h"], "", "-lgif", ["loaders"]],
 304                    ["tiff",
 305                     "Tag Image File Format (TIFF) library",
 306                     [header_exists, "tiffio.h"], "", "-ltiff", ["loaders"]],
 307                    ["libX11",
 308                     "X11 library",
 309                     [header_exists, "X11/Xlib.h"], "", "-lX11", ["backends"]],
 310                    ["X_SHM",
 311                     "MIT-SHM X Extension",
 312                     [header_exists, "X11/extensions/XShm.h"], "", "-lXext", ["backends"]],
 313                    ["freetype",
 314                     "A high-quality and portable font engine",
 315                     [header_exists, "ft2build.h"], "", "`freetype-config --libs`", ["core"]],
 316                    ["dl",
 317                     "Dynamic linker",
 318                     [header_exists, "dlfcn.h"], "", "-ldl", ["core"]],
 319                    ["V4L2",
 320                     "Video for linux 2",
 321                     [header_exists, "linux/videodev2.h"], "", "", ["grabbers"]],
 322                    ["pthread",
 323                     "Posix Threads",
 324                     [header_exists, "pthread.h"], "-pthread", "-pthread", ["core"]],
 325                    ["backtrace",
 326                     "C stack trace writeout",
 327                     [c_try_compile, "#include <execinfo.h>\nint main(void) { backtrace(0, 0); }",
 328                       "Checking for backtrace() ... "], "", "", ["core"]]], cfg)
 329
 330     parser = OptionParser();
 331
 332     # Get configuration parameters from environment variables
 333     for i in cfg:
 334         if i in os.environ:
 335                 cfg[i][0] = os.environ[i]
 336
 337     # Enable disable libraries for linking
 338     parser.add_option("-e", "--enable", dest="enable", action="append",
 339                       help="force enable library linking", metavar="libfoo")
 340     parser.add_option("-d", "--disable", dest="disable", action="append",
 341                       help="disable library linking", metavar="libfoo")
 342
 343     # Add cfg config options
 344     for i in cfg:
 345         parser.add_option("", "--"+i, dest=i, metavar=cfg[i][0], help=cfg[i][1])
 346
 347     (options, args) = parser.parse_args();
 348
 349     #
 350     # Enable/Disable libraries as user requested
 351     # These are not checked later
 352     #
 353     if options.enable:
 354         for i in options.enable:
 355             l.set(i, True);
 356     if options.disable:
 357         for i in options.disable:
 358             l.set(i, False);
 359
 360     for i in cfg:
 361         if getattr(options, i):
 362             cfg[i][0] = getattr(options, i)
 363
 364     basic_checks(cfg);
 365
 366     l.check()
 367     l.print_summary()
 368
 369     write_config_h(cfg, l)
 370     write_config_mk(cfg, l)
 371     write_gfxprim_config(cfg, l)