configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4 ###############################################################################
   5 #
   6 #   Copyright (C) 2007 Lasse Collin
   7 #
   8 #   This library is free software; you can redistribute it and/or
   9 #   modify it under the terms of the GNU Lesser General Public
  10 #   License as published by the Free Software Foundation; either
  11 #   version 2.1 of the License, or (at your option) any later version.
  12 #
  13 #   This library is distributed in the hope that it will be useful,
  14 #   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 #   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 #   Lesser General Public License for more details.
  17 #
  18 ###############################################################################
  19
  20 # NOTE: Don't add useless checks. autoscan detects this and that, but don't
  21 # let it confuse you. For example, we don't care about checking for behavior
  22 # of malloc(), stat(), or lstat(), since we don't use those functions in
  23 # a way that would cause the problems the autoconf macros check.
  24
  25 AC_PREREQ(2.61)
  26
  27 # [LZMA] instead of [LZMA utils] since I prefer to have lzma-version.tar.gz
  28 # instead of lzma-utils-version.tar.gz.
  29 AC_INIT([LZMA], [4.999.3alpha], [lasse.collin@tukaani.org])
  30
  31 AC_CONFIG_SRCDIR([src/liblzma/common/common.h])
  32 AC_CONFIG_HEADER([config.h])
  33
  34 echo
  35 echo "LZMA Utils $PACKAGE_VERSION"
  36
  37 echo
  38 echo "System type:"
  39 # This is needed to know if assembler optimizations can be used.
  40 AC_CANONICAL_HOST
  41
  42 echo
  43 echo "Configure options:"
  44
  45 # Enable/disable debugging code:
  46 AC_MSG_CHECKING([if debugging code should be compiled])
  47 AC_ARG_ENABLE(debug, AC_HELP_STRING([--enable-debug], [Enable debugging code.]),
  48         [], enable_debug=no)
  49 if test "x$enable_debug" = xyes; then
  50         AC_MSG_RESULT([yes])
  51 else
  52         AC_DEFINE(NDEBUG, 1, [Define to disable debugging code.])
  53         AC_MSG_RESULT([no])
  54 fi
  55
  56 # Enable/disable the encoder components:
  57 AC_MSG_CHECKING([if encoder components should be built])
  58 AC_ARG_ENABLE(encoder, AC_HELP_STRING([--disable-encoder],
  59                 [Do not build the encoder components.]),
  60         [], enable_encoder=yes)
  61 if test "x$enable_encoder" = xyes; then
  62         AC_DEFINE([HAVE_ENCODER], 1,
  63                 [Define to 1 if encoder components are enabled.])
  64         AC_MSG_RESULT([yes])
  65 else
  66         AC_MSG_RESULT([no])
  67 fi
  68 AM_CONDITIONAL(COND_MAIN_ENCODER, test "x$enable_encoder" = xyes)
  69
  70 # Enable/disable the decoder components:
  71 AC_MSG_CHECKING([if decoder components should be built])
  72 AC_ARG_ENABLE(decoder, AC_HELP_STRING([--disable-decoder],
  73                 [Do not build the decoder components.]),
  74         [], enable_decoder=yes)
  75 if test "x$enable_decoder" = xyes; then
  76         AC_DEFINE([HAVE_DECODER], 1,
  77                 [Define to 1 if decoder components are enabled.])
  78         AC_MSG_RESULT([yes])
  79 else
  80         AC_MSG_RESULT([no])
  81         if test "x$enable_encoder" = xno; then
  82                 AC_MSG_ERROR([Do not disable both encoder and decoder.])
  83         fi
  84 fi
  85 AM_CONDITIONAL(COND_MAIN_DECODER, test "x$enable_decoder" = xyes)
  86
  87 # Filters
  88 AC_MSG_CHECKING([which filters to build])
  89 AC_ARG_ENABLE(filters, AC_HELP_STRING([--enable-filters=],
  90                 [Comma-separated list of filters to build. Default=all.
  91                 Filters used in encoding are needed also in decoding.
  92                 Available filters: copy subblock x86 powerpc ia64
  93                 arm armthumb sparc delta lzma]),
  94                 [], [enable_filters=copy,subblock,x86,powerpc,ia64,arm,armthumb,sparc,delta,lzma])
  95 enable_filters=`echo "$enable_filters" | sed 's/,/ /g'`
  96 enable_filters_copy=no
  97 enable_filters_subblock=no
  98 enable_filters_x86=no
  99 enable_filters_powerpc=no
 100 enable_filters_ia64=no
 101 enable_filters_arm=no
 102 enable_filters_armthumb=no
 103 enable_filters_sparc=no
 104 enable_filters_delta=no
 105 enable_filters_lzma=no
 106 enable_simple_filters=no
 107 if test "x$enable_filters" = xno || test "x$enable_filters" = x; then
 108         AC_MSG_RESULT([])
 109         AC_MSG_ERROR([Please enable at least one filter.])
 110 else
 111         for arg in $enable_filters
 112         do
 113                 case $arg in
 114                         copy)
 115                                 enable_filters_copy=yes
 116                                 AC_DEFINE([HAVE_FILTER_COPY], 1,
 117                                         [Define to 1 if support for the
 118                                         Copy filter is enabled.])
 119                                 ;;
 120                         subblock)
 121                                 enable_filters_subblock=yes
 122                                 AC_DEFINE([HAVE_FILTER_SUBBLOCK], 1,
 123                                         [Define to 1 if support for the
 124                                         Subblock filter is enabled.])
 125                                 ;;
 126                         x86)
 127                                 enable_filters_x86=yes
 128                                 enable_simple_filters=yes
 129                                 AC_DEFINE([HAVE_FILTER_X86], 1,
 130                                         [Define to 1 if support for the
 131                                         x86 (BCJ) filter is enabled.])
 132                                 ;;
 133                         powerpc)
 134                                 enable_filters_powerpc=yes
 135                                 enable_simple_filters=yes
 136                                 AC_DEFINE([HAVE_FILTER_POWERPC], 1,
 137                                         [Define to 1 if support for the
 138                                         PowerPC filter is enabled.])
 139                                 ;;
 140                         ia64)
 141                                 enable_filters_ia64=yes
 142                                 enable_simple_filters=yes
 143                                 AC_DEFINE([HAVE_FILTER_IA64], 1,
 144                                         [Define to 1 if support for the
 145                                         IA64 filter is enabled.])
 146                                 ;;
 147                         arm)
 148                                 enable_filters_arm=yes
 149                                 enable_simple_filters=yes
 150                                 AC_DEFINE([HAVE_FILTER_ARM], 1,
 151                                         [Define to 1 if support for the
 152                                         ARM filter is enabled.])
 153                                 ;;
 154                         armthumb)
 155                                 enable_filters_armthumb=yes
 156                                 enable_simple_filters=yes
 157                                 AC_DEFINE([HAVE_FILTER_ARMTHUMB], 1,
 158                                         [Define to 1 if support for the
 159                                         ARMThumb filter is enabled.])
 160                                 ;;
 161                         sparc)
 162                                 enable_filters_sparc=yes
 163                                 enable_simple_filters=yes
 164                                 AC_DEFINE([HAVE_FILTER_SPARC], 1,
 165                                         [Define to 1 if support for the
 166                                         SPARC filter is enabled.])
 167                                 ;;
 168                         delta)
 169                                 enable_filters_delta=yes
 170                                 AC_DEFINE([HAVE_FILTER_DELTA], 1,
 171                                         [Define to 1 if support for the
 172                                         Delta filter is enabled.])
 173                                 ;;
 174                         lzma)
 175                                 enable_filters_lzma=yes
 176                                 AC_DEFINE([HAVE_FILTER_LZMA], 1,
 177                                         [Define to 1 if support for the
 178                                         LZMA filter is enabled.])
 179                                 ;;
 180                         *)
 181                                 AC_MSG_RESULT([])
 182                                 AC_MSG_ERROR([unknown filter: $arg])
 183                                 ;;
 184                 esac
 185         done
 186         AC_MSG_RESULT([$enable_filters])
 187 fi
 188 if test "x$enable_simple_filters" = xyes ; then
 189         AC_DEFINE([HAVE_FILTER_SIMPLE], 1, [Define to 1 if support for any
 190                 of the so called simple filters is enabled.])
 191 fi
 192 AM_CONDITIONAL(COND_FILTER_COPY, test "x$enable_filters_copy" = xyes)
 193 AM_CONDITIONAL(COND_FILTER_SUBBLOCK, test "x$enable_filters_subblock" = xyes)
 194 AM_CONDITIONAL(COND_FILTER_X86, test "x$enable_filters_x86" = xyes)
 195 AM_CONDITIONAL(COND_FILTER_POWERPC, test "x$enable_filters_powerpc" = xyes)
 196 AM_CONDITIONAL(COND_FILTER_IA64, test "x$enable_filters_ia64" = xyes)
 197 AM_CONDITIONAL(COND_FILTER_ARM, test "x$enable_filters_arm" = xyes)
 198 AM_CONDITIONAL(COND_FILTER_ARMTHUMB, test "x$enable_filters_armthumb" = xyes)
 199 AM_CONDITIONAL(COND_FILTER_SPARC, test "x$enable_filters_sparc" = xyes)
 200 AM_CONDITIONAL(COND_FILTER_DELTA, test "x$enable_filters_delta" = xyes)
 201 AM_CONDITIONAL(COND_FILTER_LZMA, test "x$enable_filters_lzma" = xyes)
 202 AM_CONDITIONAL(COND_MAIN_SIMPLE, test "x$enable_simple_filters" = xyes)
 203
 204 # Which match finders should be enabled:
 205 AC_MSG_CHECKING([which match finders to build])
 206 AC_ARG_ENABLE(match-finders, AC_HELP_STRING([--enable-match-finders=],
 207                 [Comma-separated list of match finders to build. Default=all.
 208                 At least one match finder is required for encoding with
 209                 the LZMA filter.
 210                 Available match finders: hc3 hc4 bt2 bt3 bt4]), [],
 211         [enable_match_finders=hc3,hc4,bt2,bt3,bt4])
 212 enable_match_finders=`echo "$enable_match_finders" | sed 's/,/ /g'`
 213 enable_match_finders_hc3=no
 214 enable_match_finders_hc4=no
 215 enable_match_finders_bt2=no
 216 enable_match_finders_bt3=no
 217 enable_match_finders_bt4=no
 218 if test "x$enable_encoder" = xyes && test "x$enable_filters_lzma" = xyes ; then
 219         for arg in $enable_match_finders
 220                 do
 221                 case $arg in
 222                         hc3) enable_match_finders_hc3=yes ;;
 223                         hc4) enable_match_finders_hc4=yes ;;
 224                         bt2) enable_match_finders_bt2=yes ;;
 225                         bt3) enable_match_finders_bt3=yes ;;
 226                         bt4) enable_match_finders_bt4=yes ;;
 227                         *)
 228                                 AC_MSG_RESULT([])
 229                                 AC_MSG_ERROR([unknown match finder: $arg])
 230                                 ;;
 231                 esac
 232         done
 233         AC_MSG_RESULT([$enable_match_finders])
 234 else
 235         AC_MSG_RESULT([(none because not building the LZMA encoder)])
 236 fi
 237 AM_CONDITIONAL(COND_MF_HC3, test "x$enable_match_finders_hc3" = xyes)
 238 AM_CONDITIONAL(COND_MF_HC4, test "x$enable_match_finders_hc4" = xyes)
 239 AM_CONDITIONAL(COND_MF_BT2, test "x$enable_match_finders_bt2" = xyes)
 240 AM_CONDITIONAL(COND_MF_BT3, test "x$enable_match_finders_bt3" = xyes)
 241 AM_CONDITIONAL(COND_MF_BT4, test "x$enable_match_finders_bt4" = xyes)
 242
 243 # Which integrity checks to build
 244 AC_MSG_CHECKING([which integrity checks to build])
 245 AC_ARG_ENABLE(checks, AC_HELP_STRING([--enable-checks=],
 246                 [Comma-separated list of integrity checks to build.
 247                 Default=all. Available integrity checks: crc32 crc64 sha256]),
 248                 [], [enable_checks=crc32,crc64,sha256])
 249 enable_checks=`echo "$enable_checks" | sed 's/,/ /g'`
 250 enable_checks_crc32=no
 251 enable_checks_crc64=no
 252 enable_checks_sha256=no
 253 if test "x$enable_checks" = xno || test "x$enable_checks" = x; then
 254         AC_MSG_RESULT([(none)])
 255 else
 256         for arg in $enable_checks
 257         do
 258                 case $arg in
 259                         crc32)
 260                                 enable_checks_crc32=yes
 261                                 AC_DEFINE([HAVE_CHECK_CRC32], 1,
 262                                         [Define to 1 if CRC32 support
 263                                         is enabled.])
 264                                 ;;
 265                         crc64)
 266                                 enable_checks_crc64=yes
 267                                 AC_DEFINE([HAVE_CHECK_CRC64], 1,
 268                                         [Define to 1 if CRC64 support
 269                                         is enabled.])
 270                                 ;;
 271                         sha256)
 272                                 enable_checks_sha256=yes
 273                                 AC_DEFINE([HAVE_CHECK_SHA256], 1,
 274                                         [Define to 1 if SHA256 support
 275                                         is enabled.])
 276                                 ;;
 277                         *)
 278                                 AC_MSG_RESULT([])
 279                                 AC_MSG_ERROR([unknown integrity check: $arg])
 280                                 ;;
 281                 esac
 282         done
 283         AC_MSG_RESULT([$enable_checks])
 284 fi
 285 if test "x$enable_checks_crc32" = xno ; then
 286         AC_MSG_ERROR([For now, the CRC32 check must always be enabled.])
 287 fi
 288 AM_CONDITIONAL(COND_CHECK_CRC32, test "x$enable_checks_crc32" = xyes)
 289 AM_CONDITIONAL(COND_CHECK_CRC64, test "x$enable_checks_crc64" = xyes)
 290 AM_CONDITIONAL(COND_CHECK_SHA256, test "x$enable_checks_sha256" = xyes)
 291
 292 # Assembler optimizations
 293 AC_MSG_CHECKING([if assembler optimizations should be used])
 294 AC_ARG_ENABLE(assembler, AC_HELP_STRING([--disable-assembler],
 295                 [Do not use assembler optimizations even if such exist
 296                 for the architecture.]),
 297                 [], [enable_assembler=yes])
 298 if test "x$enable_assembler" = xyes; then
 299         case $host_cpu in
 300                 i?86)   enable_assembler=x86 ;;
 301                 x86_64) enable_assembler=x86_64 ;;
 302                 *)      enable_assembler=no ;;
 303         esac
 304         # Darwin has different ABI than GNU+Linux and Solaris,
 305         # and the assembler code doesn't assemble.
 306         case $host_os in
 307                 darwin*) enable_assembler=no ;;
 308                 *)       ;;
 309         esac
 310 fi
 311 case $enable_assembler in
 312         x86)
 313                 AC_DEFINE([HAVE_ASM_X86], 1,
 314                         [Define to 1 if using x86 assembler optimizations.])
 315                 ;;
 316         x86_64)
 317                 AC_DEFINE([HAVE_ASM_X86_64], 1,
 318                         [Define to 1 if using x86_64 assembler optimizations.])
 319                 ;;
 320         no)
 321                 ;;
 322         *)
 323                 AC_MSG_RESULT([])
 324                 AC_MSG_ERROR([--enable-assembler accepts only \`yes', \`no', or \`x86'.])
 325                 ;;
 326 esac
 327 AC_MSG_RESULT([$enable_assembler])
 328 AM_CONDITIONAL(COND_ASM_X86, test "x$enable_assembler" = xx86)
 329
 330 # Size optimization
 331 AC_MSG_CHECKING([if small size is preferred over speed])
 332 AC_ARG_ENABLE(small, AC_HELP_STRING([--enable-small],
 333                 [Omit precomputed tables to make liblzma a few kilobytes
 334                 smaller. This will increase startup time of applications
 335                 slightly, because the tables need to be computed first.]),
 336                 [], [enable_small=no])
 337 if test "x$enable_small" = xyes; then
 338         AC_DEFINE([HAVE_SMALL], 1, [Define to 1 if optimizing for size.])
 339 elif test "x$enable_small" != xno; then
 340         AC_MSG_RESULT([])
 341         AC_MSG_ERROR([--enable-small accepts only \`yes' or \`no'])
 342 fi
 343 AC_MSG_RESULT([$enable_small])
 344 AM_CONDITIONAL(COND_SMALL, test "x$enable_small" = xyes)
 345
 346 ###############################################################################
 347 # Checks for programs.
 348 ###############################################################################
 349
 350 echo
 351 echo "Initializing Automake:"
 352
 353 # There's no C++ or Fortran in LZMA Utils:
 354 CXX=no
 355 F77=no
 356
 357 AM_INIT_AUTOMAKE([1.10 foreign tar-v7 filename-length-max=99])
 358 AC_PROG_LN_S
 359 AM_PROG_CC_C_O
 360 AM_PROG_AS
 361 AC_USE_SYSTEM_EXTENSIONS
 362
 363 echo
 364 echo "Threading support:"
 365 ACX_PTHREAD
 366 CC="$PTHREAD_CC"
 367
 368 echo
 369 echo "Initializing Libtool:"
 370 AC_PROG_LIBTOOL
 371
 372
 373 ###############################################################################
 374 # Checks for libraries.
 375 ###############################################################################
 376
 377 echo
 378 echo "Initializing gettext:"
 379 AM_GNU_GETTEXT_VERSION([0.16.1])
 380 AM_GNU_GETTEXT([external])
 381
 382 ###############################################################################
 383 # Checks for header files.
 384 ###############################################################################
 385
 386 echo
 387 echo "System headers and functions:"
 388
 389 # There is currently no workarounds in this package if some of
 390 # these headers are missing.
 391 AC_CHECK_HEADERS([fcntl.h limits.h sys/time.h],
 392         [],
 393         [AC_MSG_ERROR([Required header file(s) are missing.])])
 394
 395 # If any of these headers are missing, things should still work correctly:
 396 AC_CHECK_HEADERS([assert.h errno.h byteswap.h sys/param.h sys/sysctl.h],
 397         [], [], [
 398 #ifdef HAVE_SYS_PARAM_H
 399 #       include <sys/param.h>
 400 #endif
 401 ])
 402
 403
 404 ###############################################################################
 405 # Checks for typedefs, structures, and compiler characteristics.
 406 ###############################################################################
 407
 408 AC_C_INLINE
 409 AC_C_RESTRICT
 410
 411 AC_HEADER_STDBOOL
 412
 413 AC_TYPE_UINT8_T
 414 AC_TYPE_INT32_T
 415 AC_TYPE_UINT32_T
 416 AC_TYPE_INT64_T
 417 AC_TYPE_UINT64_T
 418 AC_TYPE_UINTPTR_T
 419
 420 AC_CHECK_SIZEOF([unsigned long])
 421 AC_CHECK_SIZEOF([size_t])
 422
 423 # The command line tool can copy high resolution timestamps if such
 424 # information is availabe in struct stat. Otherwise one second accuracy
 425 # is used. Most systems seem to have st_xtim but BSDs have st_xtimespec.
 426 AC_CHECK_MEMBERS([struct stat.st_atim.tv_nsec, struct stat.st_mtim.tv_nsec,
 427         struct stat.st_atimespec.tv_nsec, struct stat.st_mtimespec.tv_nsec])
 428
 429 # It is very unlikely that you want to build liblzma without
 430 # large file support.
 431 AC_SYS_LARGEFILE
 432
 433 # At the moment, the only endian-dependent part should be the integrity checks.
 434 AC_C_BIGENDIAN
 435
 436
 437 ###############################################################################
 438 # Checks for library functions.
 439 ###############################################################################
 440
 441 # Gnulib replacements as needed
 442 gl_GETOPT
 443
 444 # Functions that are not mandatory i.e. we have alternatives for them
 445 # or we can just drop some functionality:
 446 AC_CHECK_FUNCS([memcpy memmove memset futimes futimesat])
 447
 448 # Check how to find out the amount of physical memory in the system. The
 449 # lzma command line tool uses this to automatically limits its memory usage.
 450 # - sysconf() gives all the needed info on GNU+Linux and Solaris.
 451 # - BSDs use sysctl().
 452 AC_MSG_CHECKING([how to detect the amount of physical memory])
 453 AC_COMPILE_IFELSE([
 454 #include <unistd.h>
 455 int
 456 main()
 457 {
 458         long i;
 459         i = sysconf(_SC_PAGESIZE);
 460         i = sysconf(_SC_PHYS_PAGES);
 461         return 0;
 462 }
 463 ], [
 464         AC_DEFINE([HAVE_PHYSMEM_SYSCONF], 1,
 465                 [Define to 1 if the amount of physical memory can be detected
 466                 with sysconf(_SC_PAGESIZE) and sysconf(_SC_PHYS_PAGES).])
 467         AC_MSG_RESULT([sysconf])
 468 ], [
 469 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 470 #include <sys/types.h>
 471 #ifdef HAVE_SYS_PARAM_H
 472 #       include <sys/param.h>
 473 #endif
 474 #include <sys/sysctl.h>
 475 int
 476 main()
 477 {
 478         int name[2] = { CTL_HW, HW_PHYSMEM };
 479         unsigned long mem;
 480         size_t mem_ptr_size = sizeof(mem);
 481         sysctl(name, 2, &mem, &mem_ptr_size, NULL, NULL);
 482         return 0;
 483 }
 484 ]])], [
 485         AC_DEFINE([HAVE_PHYSMEM_SYSCTL], 1,
 486                 [Define to 1 if the amount of physical memory can be detected
 487                 with sysctl().])
 488         AC_MSG_RESULT([sysctl])
 489 ], [
 490         AC_MSG_RESULT([unknown])
 491 ])])
 492
 493 # Check how to find out the number of available CPU cores in the system.
 494 # sysconf(_SC_NPROCESSORS_ONLN) works on most systems, except that BSDs
 495 # use sysctl().
 496 AC_MSG_CHECKING([how to detect the number of available CPU cores])
 497 AC_COMPILE_IFELSE([
 498 #include <unistd.h>
 499 int
 500 main()
 501 {
 502         long i;
 503         i = sysconf(_SC_NPROCESSORS_ONLN);
 504         return 0;
 505 }
 506 ], [
 507         AC_DEFINE([HAVE_NCPU_SYSCONF], 1,
 508                 [Define to 1 if the number of available CPU cores can be
 509                 detected with sysconf(_SC_NPROCESSORS_ONLN).])
 510         AC_MSG_RESULT([sysconf])
 511 ], [
 512 AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
 513 #include <sys/types.h>
 514 #ifdef HAVE_SYS_PARAM_H
 515 #       include <sys/param.h>
 516 #endif
 517 #include <sys/sysctl.h>
 518 int
 519 main()
 520 {
 521         int name[2] = { CTL_HW, HW_NCPU };
 522         int cpus;
 523         size_t cpus_size = sizeof(cpus);
 524         sysctl(name, 2, &cpus, &cpus_size, NULL, NULL);
 525         return 0;
 526 }
 527 ]])], [
 528         AC_DEFINE([HAVE_NCPU_SYSCTL], 1,
 529                 [Define to 1 if the number of available CPU cores can be
 530                 detected with sysctl().])
 531         AC_MSG_RESULT([sysctl])
 532 ], [
 533         AC_MSG_RESULT([unknown])
 534 ])])
 535
 536
 537 ###############################################################################
 538 # If using GCC, set some additional CFLAGS:
 539 ###############################################################################
 540
 541 Wno_uninitialized=no
 542
 543 if test "x$GCC" = xyes ; then
 544         echo
 545         echo "GCC extensions:"
 546         gl_VISIBILITY
 547         if test -n "$CFLAG_VISIBILITY" ; then
 548                 CFLAGS="$CFLAG_VISIBILITY $CFLAGS"
 549         fi
 550
 551         # -Wno-uninitialized is needed with -Werror with SHA256 code
 552         # to omit a bogus warning.
 553         AC_MSG_CHECKING([if $CC accepts -Wno-uninitialized])
 554         OLD_CFLAGS="$CFLAGS"
 555         CFLAGS="$CFLAGS -Wno-uninitialized"
 556         AC_COMPILE_IFELSE([void foo(void) { }], [Wno_uninitialized=yes])
 557         CFLAGS="$OLD_CFLAGS"
 558         AC_MSG_RESULT([$Wno_uninitialized])
 559
 560         # Enable as much warnings as possible. These commented warnings won't
 561         # work for LZMA Utils though:
 562         #   * -Wunreachable-code breaks several assert(0) cases, which are
 563         #     backed up with "return LZMA_PROG_ERROR".
 564         #   * -Wcast-qual would break various things where we need a non-const
 565         #     pointer although we don't modify anything through it.
 566         #   * -Wcast-align breaks optimized CRC32 and CRC64 implementation
 567         #     on some architectures (not on x86), where this warning is bogus,
 568         #     because we take care of correct alignment.
 569         #   * -Winline, -Wdisabled-optimization, -Wunsafe-loop-optimizations
 570         #     don't seem so useful here; at least the last one gives some
 571         #     warnings which are not bugs.
 572         #
 573         # The flags are in reverse order below so they end up in "beautiful"
 574         # order on the actual command line.
 575         for NEW_FLAG in \
 576                         -Wredundant-decls \
 577                         -Wmissing-noreturn \
 578                         -Wmissing-declarations \
 579                         -Wmissing-prototypes \
 580                         -Wold-style-definition \
 581                         -Wstrict-prototypes \
 582                         -Waggregate-return \
 583                         -Wwrite-strings \
 584                         -Wbad-function-cast \
 585                         -Wpointer-arith \
 586                         -Wshadow \
 587                         -Wfloat-equal \
 588                         -Wstrict-aliasing=2 \
 589                         -Winit-self \
 590                         -Wformat=2 \
 591                         -Wextra \
 592                         -Wall \
 593                         -pedantic \
 594                         -std=c99
 595         do
 596                 AC_MSG_CHECKING([if $CC accepts $NEW_FLAG])
 597                 OLD_CFLAGS="$CFLAGS"
 598                 CFLAGS="$NEW_FLAG $CFLAGS"
 599                 AC_COMPILE_IFELSE([void foo(void) { }], [
 600                         AC_MSG_RESULT([yes])
 601                 ], [
 602                         CFLAGS="$OLD_CFLAGS"
 603                         AC_MSG_RESULT([no])
 604                 ])
 605         done
 606
 607         AC_ARG_ENABLE([werror],
 608                 AC_HELP_STRING([--enable-werror], [Enable -Werror to abort
 609                         compilation on all compiler warnings.]),
 610                 [], [enable_werror=no])
 611         if test "x$enable_werror" = "xyes"; then
 612                 CFLAGS="-Werror $CFLAGS"
 613         fi
 614 fi
 615
 616 AM_CONDITIONAL([COND_WNO_UNINITIALIZED], test "x$Wno_uninitialized" = "xyes")
 617
 618
 619 ###############################################################################
 620 # Create the makefiles and config.h
 621 ###############################################################################
 622
 623 echo
 624
 625 # Don't build the lib directory at all if we don't need any replacement
 626 # functions.
 627 AM_CONDITIONAL([COND_GNULIB], test -n "$LIBOBJS")
 628
 629 AC_CONFIG_FILES([
 630         Doxyfile
 631         Makefile
 632         po/Makefile.in
 633         lib/Makefile
 634         src/Makefile
 635         src/liblzma/lzma.pc
 636         src/liblzma/Makefile
 637         src/liblzma/api/Makefile
 638         src/liblzma/common/Makefile
 639         src/liblzma/check/Makefile
 640         src/liblzma/lz/Makefile
 641         src/liblzma/lzma/Makefile
 642         src/liblzma/simple/Makefile
 643         src/liblzma/subblock/Makefile
 644         src/liblzma/rangecoder/Makefile
 645         src/lzma/Makefile
 646         src/lzmadec/Makefile
 647         src/scripts/Makefile
 648         tests/Makefile
 649         debug/Makefile
 650 ])
 651
 652 AC_OUTPUT