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 import subprocess
   9
  10 def header_exists(cfg, *filenames):
  11     for filename in filenames:
  12         fpath = cfg['include_path'][0] + '/' + filename
  13
  14         sys.stderr.write("Checking for '%s' ... " % fpath)
  15
  16         try:
  17             st = os.stat(fpath)
  18             sys.stderr.write("Yes\n")
  19             return True
  20         except os.error:
  21             sys.stderr.write("No\n")
  22     return False
  23
  24 def c_try_compile(cfg, code, msg):
  25     sys.stderr.write(msg)
  26
  27     ret = os.system("echo '%s' | %s %s -x c -o /dev/null - > /dev/null 2>&1" %
  28                     (code, cfg['CC'][0], cfg['CFLAGS'][0]))
  29
  30     if ret:
  31         sys.stderr.write("No\n")
  32         return False
  33     else:
  34         sys.stderr.write("Yes\n")
  35         return True
  36
  37 def c_compiler_exists(cfg):
  38     return c_try_compile(cfg, "int main(void) { return 0; }",
  39                          "Checking for working compiler (%s) ... " %
  40                          cfg["CC"][0])
  41
  42 def define_fortify_source(cfg):
  43     return c_try_compile(cfg, "int main(void) {\n" +
  44                               "#if !defined _FORTIFY_SOURCE &&" +
  45                               "defined __OPTIMIZE__ && __OPTIMIZE__\n" +
  46                               "        return 0;\n" +
  47                               "#else\n" +
  48                               " #error FORTIFY_SOURCE not usable\n" +
  49                               "#endif\n" +
  50                               "}", "Whether to define _FORTIFY_SOURCE ... ");
  51
  52 def python_version(cfg):
  53     sys.stderr.write("Checking for python-config Python version ... ")
  54
  55     if (cfg['PYTHON_CONFIG'][0] is ''):
  56         sys.stderr.write('NA\n')
  57         return ''
  58
  59     cmd = subprocess.Popen([cfg['PYTHON_CONFIG'][0], '--ldflags'],
  60                            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  61     res = str(cmd.communicate())
  62     res = res[res.find('-lpython')+8:]
  63     res = res[:3]
  64
  65     sys.stderr.write("%s\n" % res)
  66     return res
  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 # Adds prefix to *dir vars but only if the path does not start with '/'
  92 #
  93 def cfg_get_value(cfg_key):
  94     if (cfg_key.endswith('dir')):
  95         value = cfg[cfg_key][0]
  96         if (value.startswith('/')):
  97             return value
  98         else:
  99             prefix = cfg['prefix'][0]
 100             if (prefix.endswith('/')):
 101                 return prefix + value
 102             else:
 103                 return prefix + '/' + value
 104     else:
 105         return cfg[cfg_key][0]
 106
 107 #
 108 # Library checking api
 109 #
 110 class libraries:
 111     def __init__(self, libraries, cfg):
 112         self.libraries = libraries
 113         self.cfg = cfg;
 114         # Create dictionary for check results
 115         self.results = dict()
 116     #
 117     # Print summary
 118     #
 119     def print_summary(self):
 120         sys.stderr.write("Settings and variables\n")
 121         sys.stderr.write("----------------------\n")
 122
 123         for i in cfg:
 124             value = cfg_get_value(i)
 125             sys.stderr.write("%14s : '%s'\n" % (i, value))
 126             sys.stderr.write("              - %s\n\n" % cfg[i][1])
 127
 128         sys.stderr.write("Libraries to link against\n")
 129         sys.stderr.write("-------------------------\n")
 130
 131         for i in self.libraries:
 132             sys.stderr.write("%10s" % i[0])
 133
 134             if (self.results[i[0]]):
 135                 sys.stderr.write(" : Enabled\n")
 136             else:
 137                 sys.stderr.write(" : Disabled\n")
 138
 139             sys.stderr.write("          - %s\n\n" % i[1])
 140     #
 141     # Enable/Disable library
 142     #
 143     def set(self, name, val):
 144         if name not in map(lambda s: s[0], self.libraries):
 145             sys.stderr.write("ERROR: Invalid library '%s'\n" % name)
 146             exit(1)
 147         else:
 148             self.results[name] = val
 149     #
 150     # Calls a function on arguments, all is stored in array if
 151     # not set previously
 152     # (I know this smells like a lisp, but I can't help myself)
 153     #
 154     def check(self):
 155         sys.stderr.write("Checking for libraries\n")
 156         sys.stderr.write("----------------------\n")
 157         for i in self.libraries:
 158             if i[0] not in self.results:
 159                 self.results[i[0]] = i[2][0](self.cfg, *i[2][1:])
 160         sys.stderr.write("\n")
 161     #
 162     # Writes '#define HAVE_XXX_H' into passed file
 163     #
 164     def write_config_h(self, f):
 165         for i in self.libraries:
 166             f.write("/*\n * %s\n */\n" % i[1])
 167             if self.results[i[0]]:
 168                 f.write("#define HAVE_%s\n" % i[0].upper())
 169             else:
 170                 f.write("//#define HAVE_%s\n" % i[0].upper())
 171             f.write("\n")
 172
 173     #
 174     # Writes LDLIBS and CFLAGS into passed file
 175     #
 176     def write_config_mk(self, f):
 177         for i in self.libraries:
 178             f.write("# %s - %s\n" % (i[0], i[1]))
 179             if self.results[i[0]]:
 180                 f.write("HAVE_%s=yes\n" % i[0].upper())
 181             #   f.write("CFLAGS+=%s\nLDLIBS+=%s\n" % (i[3], i[4]))
 182             else:
 183                 f.write("HAVE_%s=no\n" % i[0].upper())
 184
 185         # Write all libraries the library should link with
 186         for module in self.get_modules():
 187             f.write("# %s linker flags\n" % (module))
 188             f.write("LDLIBS_%s=" % (module))
 189             f.write("%s\n" % self.get_linker_flags(module))
 190     #
 191     # Return list of linker flags needed to build particular module
 192     # (module may be core, loaders, backends, etc...
 193     #
 194     def get_linker_flags(self, module):
 195         res = ''
 196         for i in self.libraries:
 197             if module in i[5] and self.results[i[0]]:
 198                 if i[4] == '':
 199                     continue;
 200                 if res != '':
 201                     res += ' '
 202                 res += i[4]
 203         return res
 204     #
 205     # Returns list of cflags needed to build module
 206     #
 207     def get_cflags(self, module):
 208         res = ''
 209         for i in self.libraries:
 210             if module in i[5] and self.results[i[0]]:
 211                 res += ' ' + i[3]
 212         return res
 213
 214     #
 215     # Builds a list of GFXprim libraries that may need to be linked against
 216     # third party libs
 217     #
 218     def get_modules(self):
 219         modules = {}
 220         for i in self.libraries:
 221             for module in i[5]:
 222                 modules[module] = True
 223         return modules.keys()
 224
 225 def die_screaming(msg):
 226     sys.stderr.write("\n************************************\n")
 227     sys.stderr.write("ERROR: ")
 228     sys.stderr.write(msg)
 229     sys.stderr.write("\n************************************\n")
 230     exit(1)
 231
 232 #
 233 # Check for basic compiling tools
 234 #
 235 def basic_checks(cfg):
 236     sys.stderr.write("Basic checks\n")
 237     sys.stderr.write("------------\n")
 238
 239     if not c_compiler_exists(cfg):
 240         die_screaming("No C compiler found")
 241
 242     check_for_swig(cfg)
 243     check_for_python_config(cfg)
 244
 245     if define_fortify_source(cfg):
 246         cfg['CFLAGS'][0] = cfg['CFLAGS'][0] + " -D_FORTIFY_SOURCE=2"
 247
 248     cfg['PYTHON_VER'][0] = python_version(cfg)
 249
 250     if cfg['libdir'][0] == '':
 251         sys.stderr.write("Checking for lib directory ... ")
 252
 253         if os.path.isdir('/usr/lib64'):
 254             cfg['libdir'][0] = 'lib64'
 255         else:
 256             cfg['libdir'][0] = 'lib'
 257
 258         sys.stderr.write(cfg['libdir'][0] + '\n');
 259
 260     sys.stderr.write('\n')
 261
 262 #
 263 # Write configuration files
 264 #
 265 def write_config_h(cfg, libs):
 266     f = open("config.h", "w")
 267     f.write("/*\n * This file is genereated by configure script\n */\n");
 268     f.write("#ifndef CONFIG_H\n#define CONFIG_H\n\n")
 269     libs.write_config_h(f);
 270     f.write("#endif /* CONFIG_H */\n");
 271     sys.stderr.write("Config 'config.h' written\n")
 272     f.close()
 273
 274 def write_config_mk(cfg, libs):
 275     f = open('config.gen.mk', 'w')
 276
 277     for i in cfg:
 278         f.write("# %s\n%s=%s\n" % (cfg[i][1], i, cfg_get_value(i)))
 279
 280     libs.write_config_mk(f);
 281     f.close()
 282     sys.stderr.write("Config 'config.gen.mk' written\n")
 283
 284 #
 285 # Generate app compilation helper
 286 #
 287 def write_gfxprim_config(cfg, libs):
 288     modules = libs.get_modules()
 289     f = open('gfxprim-config', 'w')
 290     f.write('#!/bin/sh\n'
 291             '#\n# Generated by configure, do not edit directly\n#\n\n'
 292             'USAGE="Usage: $0 --list-modules --cflags --libs --libs-module_foo"\n'
 293             '\nif test $# -eq 0; then\n'
 294             '\techo "$USAGE"\n'
 295             '\texit 1\n'
 296             'fi\n\n'
 297             'while test -n "$1"; do\n'
 298             '\tcase "$1" in\n')
 299
 300     # General switches cflags and ldflags
 301     f.write('\t--help) echo "$USAGE"; exit 0;;\n')
 302     f.write('\t--list-modules) echo "%s"; exit 0;;\n' % ' '.join(modules))
 303     f.write('\t--cflags) echo -n "-I/usr/include/gfxprim/%s";;\n' %
 304             libs.get_cflags('core'))
 305     f.write('\t--libs) echo -n "-lgfxprim -lrt -lm %s ";;\n' % libs.get_linker_flags('core'))
 306
 307     # ldflags for specific modules
 308     for i in modules:
 309         ldflags = ''
 310         if i == 'backends':
 311             ldflags += '-lgfxprim-backends '
 312         if i == 'grabbers':
 313             ldflags += '-lgfxprim-grabbers '
 314         if i == 'loaders':
 315             ldflags += '-lgfxprim-loaders '
 316         ldflags += libs.get_linker_flags(i)
 317         f.write('\t--libs-%s) echo -n "%s ";;\n' % (i, ldflags))
 318
 319     f.write('\t*) echo "Invalid option \'$1\'"; echo $USAGE; exit 1;;\n')
 320
 321     f.write('\tesac\n\tshift\ndone\necho\n')
 322     f.close()
 323     os.system('chmod +x gfxprim-config')
 324
 325 def cfg_parse_args(cfg, args):
 326     for i in args:
 327         par = i.split('=');
 328         if (len(par) != 2):
 329              die_screaming('Invalid argument %s' % i)
 330
 331         if (par[0] not in cfg):
 332             die_screaming('Invalid config key %s' % i)
 333
 334         cfg[par[0]][0] = par[1]
 335
 336 if __name__ ==  '__main__':
 337     #
 338     # Dictionary for default configuration parameters
 339     #
 340     cfg = {'CC'            : ['gcc', 'Path/name of the C compiler'],
 341            'CFLAGS'        : ['-W -Wall -Wextra -O2 -ggdb', 'C compiler flags'],
 342            'PYTHON_BIN'    : ['python', 'Path/name of python interpreter'],
 343            'SWIG'          : ['swig', 'Simplified Wrapper and Interface Generator'],
 344            'PYTHON_CONFIG' : ['python-config', 'Python config helper'],
 345            'PYTHON_VER'    : ['', 'Python version (derived from python config)'],
 346            'include_path'  : ['/usr/include', 'Path to the system headers'],
 347            'prefix'        : ['/usr/local/', 'Installation prefix'],
 348            'bindir'        : ['bin', 'Where to install binaries'],
 349            'libdir'        : ['', 'Where to install libraries'],
 350            'includedir'    : ['include', 'Where to install headers'],
 351            'mandir'        : ['share/man', 'Where to install man pages'],
 352            'docdir'        : ['share/doc/', 'Where to install documentation'],
 353            # Here comes autoconf compatibility cruft, not used for anything yet
 354            'infodir'       : ['share/info', 'Where to install info pages'],
 355            'datadir'       : ['share', 'Where to place readonly arch independend datafiles'],
 356            'sysconfdir'    : ['etc', 'Where to place configuration'],
 357            'localstatedir' : ['local/var/', 'Where to place runtime modified datafiles'],
 358            'build'         : ['', 'WARNING not used'],
 359            'host'          : ['', 'WARNING not used'],
 360     }
 361
 362     #
 363     # Library detection/enable disable
 364     #
 365     # name, description, [detection], cflags, ldflags, list of modules library is needed for
 366     #
 367     l = libraries([["libpng",
 368                     "Portable Network Graphics Library",
 369                     [header_exists, "png.h"], "", "-lpng", ["loaders"]],
 370                    ["libsdl",
 371                     "Simple Direct Media Layer",
 372                     [header_exists, "SDL/SDL.h"], "", "`sdl-config --libs`", ["backends"]],
 373                    ["jpeg",
 374                     "Library to load, handle and manipulate images in the JPEG format",
 375                     [header_exists, "jpeglib.h"], "", "-ljpeg", ["loaders"]],
 376                    ["openjpeg",
 377                     "An open-source JPEG 2000 library",
 378                     [header_exists, "openjpeg-2.0/openjpeg.h"], "", "-lopenjp2", ["loaders"]],
 379                    ["giflib",
 380                     "Library to handle, display and manipulate GIF images",
 381                     [header_exists, "gif_lib.h"], "", "-lgif", ["loaders"]],
 382                    ["tiff",
 383                     "Tag Image File Format (TIFF) library",
 384                     [header_exists, "tiffio.h"], "", "-ltiff", ["loaders"]],
 385                    ["zlib",
 386                     "Standard (de)compression library",
 387                     [header_exists, "zlib.h"], "", "-lz", ["loaders"]],
 388                    ["libX11",
 389                     "X11 library",
 390                     [header_exists, "X11/Xlib.h"], "", "-lX11", ["backends"]],
 391                    ["X_SHM",
 392                     "MIT-SHM X Extension",
 393                     [header_exists, "X11/extensions/XShm.h"], "", "-lXext", ["backends"]],
 394                    ["aalib",
 395                     "Portable ascii art GFX library",
 396                     [header_exists, "aalib.h"], "", "-laa", ["backends"]],
 397                    ["freetype",
 398                     "A high-quality and portable font engine",
 399                     [header_exists, "ft2build.h", "freetype2/ft2build.h"],
 400                     "", "`freetype-config --libs`", ["core"]],
 401                    ["dl",
 402                     "Dynamic linker",
 403                     [header_exists, "dlfcn.h"], "", "-ldl", ["core"]],
 404                    ["V4L2",
 405                     "Video for linux 2",
 406                     [header_exists, "linux/videodev2.h"], "", "", ["grabbers"]],
 407                    ["libvterm",
 408                     "Implementation of a VT220/xterm/ECMA-48 terminal emulator",
 409                     [header_exists, "vterm.h"], "", "", [""]],
 410                    ["pthread",
 411                     "Posix Threads",
 412                     [header_exists, "pthread.h"], "-pthread", "-pthread", ["core"]],
 413                    ["backtrace",
 414                     "C stack trace writeout",
 415                     [c_try_compile, "#include <execinfo.h>\nint main(void) { backtrace(0, 0); }",
 416                       "Checking for backtrace() ... "], "", "", ["core"]]], cfg)
 417
 418     parser = OptionParser();
 419
 420     # Get configuration parameters from environment variables
 421     for i in cfg:
 422         if i in os.environ:
 423             cfg[i][0] = os.environ[i]
 424
 425     # Enable disable libraries for linking
 426     parser.add_option("-e", "--enable", dest="enable", action="append",
 427                       help="force enable library linking", metavar="libfoo")
 428     parser.add_option("-d", "--disable", dest="disable", action="append",
 429                       help="disable library linking", metavar="libfoo")
 430
 431     # Add cfg config options
 432     for i in cfg:
 433         parser.add_option("", "--"+i, dest=i, metavar=cfg[i][0], help=cfg[i][1])
 434
 435     (options, args) = parser.parse_args();
 436
 437     #
 438     # Enable/Disable libraries as user requested
 439     # These are not checked later
 440     #
 441     if options.enable:
 442         for i in options.enable:
 443             l.set(i, True);
 444     if options.disable:
 445         for i in options.disable:
 446             l.set(i, False);
 447
 448     for i in cfg:
 449         if getattr(options, i) is not None:
 450             cfg[i][0] = getattr(options, i)
 451
 452     #
 453     # Handle args such as CC=gcc passed after options
 454     #
 455     cfg_parse_args(cfg, args)
 456
 457     basic_checks(cfg);
 458
 459     l.check()
 460     l.print_summary()
 461
 462     write_config_h(cfg, l)
 463     write_config_mk(cfg, l)
 464     write_gfxprim_config(cfg, l)