configure.ac

   1 #                                               -*- Autoconf -*-
   2 # Process this file with autoconf to produce a configure script.
   3
   4 ###############################################################################
   5 #
   6 # Author: Lasse Collin
   7 #
   8 # This file has been put into the public domain.
   9 # You can do whatever you want with this file.
  10 #
  11 ###############################################################################
  12
  13 # NOTE: Don't add useless checks. autoscan detects this and that, but don't
  14 # let it confuse you. For example, we don't care about checking for behavior
  15 # of malloc(), stat(), or lstat(), since we don't use those functions in
  16 # a way that would cause the problems the autoconf macros check.
  17
  18 AC_PREREQ([2.61])
  19
  20 AC_INIT([XZ Utils], m4_esyscmd([/bin/sh version.sh]),
  21         [lasse.collin@tukaani.org], [xz])
  22 AC_CONFIG_SRCDIR([src/liblzma/common/common.h])
  23 AC_CONFIG_AUX_DIR([build-aux])
  24 AC_CONFIG_MACRO_DIR([m4])
  25 AC_CONFIG_HEADER([config.h])
  26
  27 PACKAGE_HOMEPAGE=http://tukaani.org/xz/
  28 AC_DEFINE_UNQUOTED([PACKAGE_HOMEPAGE], ["$PACKAGE_HOMEPAGE"],
  29         [Define to the URL of the home page of this package.])
  30 AC_SUBST([PACKAGE_HOMEPAGE])
  31
  32 echo
  33 echo "$PACKAGE_STRING"
  34
  35 echo
  36 echo "System type:"
  37 # This is needed to know if assembler optimizations can be used.
  38 AC_CANONICAL_HOST
  39
  40 # We do some special things on Windows (32-bit or 64-bit) builds.
  41 case $host_os in
  42         mingw* | cygwin*) is_w32=yes ;;
  43         *)                is_w32=no ;;
  44 esac
  45 AM_CONDITIONAL([COND_W32], [test "$is_w32" = yes])
  46
  47
  48 echo
  49 echo "Configure options:"
  50 AM_CFLAGS=
  51
  52
  53 #############
  54 # Debugging #
  55 #############
  56
  57 AC_MSG_CHECKING([if debugging code should be compiled])
  58 AC_ARG_ENABLE([debug], AC_HELP_STRING([--enable-debug], [Enable debugging code.]),
  59         [], enable_debug=no)
  60 if test "x$enable_debug" = xyes; then
  61         AC_MSG_RESULT([yes])
  62 else
  63         AC_DEFINE([NDEBUG], [1], [Define to 1 to disable debugging code.])
  64         AC_MSG_RESULT([no])
  65 fi
  66
  67
  68 ###########
  69 # Filters #
  70 ###########
  71
  72 m4_define([SUPPORTED_FILTERS], [lzma1,lzma2,subblock,delta,x86,powerpc,ia64,arm,armthumb,sparc])dnl
  73 m4_define([SIMPLE_FILTERS], [x86,powerpc,ia64,arm,armthumb,sparc])
  74 m4_define([LZ_FILTERS], [lzma1,lzma2])
  75
  76 m4_foreach([NAME], [SUPPORTED_FILTERS],
  77 [enable_filter_[]NAME=no
  78 enable_encoder_[]NAME=no
  79 enable_decoder_[]NAME=no
  80 ])dnl
  81
  82 AC_MSG_CHECKING([which encoders to build])
  83 AC_ARG_ENABLE([encoders], AC_HELP_STRING([--enable-encoders=LIST],
  84                 [Comma-separated list of encoders to build. Default=all.
  85                 Available encoders:]
  86                         m4_translit(m4_defn([SUPPORTED_FILTERS]), [,], [ ])),
  87         [], [enable_encoders=SUPPORTED_FILTERS])
  88 enable_encoders=`echo "$enable_encoders" | sed 's/,subblock//; s/,/ /g'`
  89 if test "x$enable_encoders" = xno || test "x$enable_encoders" = x; then
  90         AC_MSG_RESULT([(none)])
  91 else
  92         AC_DEFINE([HAVE_ENCODER], [1],
  93                 [Define to 1 if encoder components are enabled.])
  94         for arg in $enable_encoders
  95         do
  96                 case $arg in m4_foreach([NAME], [SUPPORTED_FILTERS], [
  97                         NAME)
  98                                 enable_filter_[]NAME=yes
  99                                 enable_encoder_[]NAME=yes
 100                                 AC_DEFINE(HAVE_ENCODER_[]m4_toupper(NAME), [1],
 101                                 [Define to 1 if] NAME [encoder is enabled.])
 102                                 ;;])
 103                         *)
 104                                 AC_MSG_RESULT([])
 105                                 AC_MSG_ERROR([unknown filter: $arg])
 106                                 ;;
 107                 esac
 108         done
 109         AC_MSG_RESULT([$enable_encoders])
 110 fi
 111
 112 AC_MSG_CHECKING([which decoders to build])
 113 AC_ARG_ENABLE([decoders], AC_HELP_STRING([--enable-decoders=LIST],
 114                 [Comma-separated list of decoders to build. Default=all.
 115                 Available decoders are the same as available encoders.]),
 116         [], [enable_decoders=SUPPORTED_FILTERS])
 117 enable_decoders=`echo "$enable_decoders" | sed 's/,subblock//; s/,/ /g'`
 118 if test "x$enable_decoders" = xno || test "x$enable_decoders" = x; then
 119         AC_MSG_RESULT([(none)])
 120 else
 121         AC_DEFINE([HAVE_DECODER], [1],
 122                 [Define to 1 if decoder components are enabled.])
 123         for arg in $enable_decoders
 124         do
 125                 case $arg in m4_foreach([NAME], [SUPPORTED_FILTERS], [
 126                         NAME)
 127                                 enable_filter_[]NAME=yes
 128                                 enable_decoder_[]NAME=yes
 129                                 AC_DEFINE(HAVE_DECODER_[]m4_toupper(NAME), [1],
 130                                 [Define to 1 if] NAME [decoder is enabled.])
 131                                 ;;])
 132                         *)
 133                                 AC_MSG_RESULT([])
 134                                 AC_MSG_ERROR([unknown filter: $arg])
 135                                 ;;
 136                 esac
 137         done
 138
 139         # LZMA2 requires that LZMA1 is enabled.
 140         test "x$enable_encoder_lzma2" = xyes && enable_encoder_lzma1=yes
 141         test "x$enable_decoder_lzma2" = xyes && enable_decoder_lzma1=yes
 142
 143         AC_MSG_RESULT([$enable_decoders])
 144 fi
 145
 146 if test "x$enable_encoder_lzma2$enable_encoder_lzma1" = xyesno \
 147                 || test "x$enable_decoder_lzma2$enable_decoder_lzma1" = xyesno; then
 148         AC_MSG_ERROR([LZMA2 requires that LZMA1 is also enabled.])
 149 fi
 150
 151 AM_CONDITIONAL(COND_MAIN_ENCODER, test "x$enable_encoders" != xno && test "x$enable_encoders" != x)
 152 AM_CONDITIONAL(COND_MAIN_DECODER, test "x$enable_decoders" != xno && test "x$enable_decoders" != x)
 153
 154 m4_foreach([NAME], [SUPPORTED_FILTERS],
 155 [AM_CONDITIONAL(COND_FILTER_[]m4_toupper(NAME), test "x$enable_filter_[]NAME" = xyes)
 156 AM_CONDITIONAL(COND_ENCODER_[]m4_toupper(NAME), test "x$enable_encoder_[]NAME" = xyes)
 157 AM_CONDITIONAL(COND_DECODER_[]m4_toupper(NAME), test "x$enable_decoder_[]NAME" = xyes)
 158 ])dnl
 159
 160 # The so called "simple filters" share common code.
 161 enable_filter_simple=no
 162 enable_encoder_simple=no
 163 enable_decoder_simple=no
 164 m4_foreach([NAME], [SIMPLE_FILTERS],
 165 [test "x$enable_filter_[]NAME" = xyes && enable_filter_simple=yes
 166 test "x$enable_encoder_[]NAME" = xyes && enable_encoder_simple=yes
 167 test "x$enable_decoder_[]NAME" = xyes && enable_decoder_simple=yes
 168 ])dnl
 169 AM_CONDITIONAL(COND_FILTER_SIMPLE, test "x$enable_filter_simple" = xyes)
 170 AM_CONDITIONAL(COND_ENCODER_SIMPLE, test "x$enable_encoder_simple" = xyes)
 171 AM_CONDITIONAL(COND_DECODER_SIMPLE, test "x$enable_decoder_simple" = xyes)
 172
 173 # LZ-based filters share common code.
 174 enable_filter_lz=no
 175 enable_encoder_lz=no
 176 enable_decoder_lz=no
 177 m4_foreach([NAME], [LZ_FILTERS],
 178 [test "x$enable_filter_[]NAME" = xyes && enable_filter_lz=yes
 179 test "x$enable_encoder_[]NAME" = xyes && enable_encoder_lz=yes
 180 test "x$enable_decoder_[]NAME" = xyes && enable_decoder_lz=yes
 181 ])dnl
 182 AM_CONDITIONAL(COND_FILTER_LZ, test "x$enable_filter_lz" = xyes)
 183 AM_CONDITIONAL(COND_ENCODER_LZ, test "x$enable_encoder_lz" = xyes)
 184 AM_CONDITIONAL(COND_DECODER_LZ, test "x$enable_decoder_lz" = xyes)
 185
 186
 187 #################
 188 # Match finders #
 189 #################
 190
 191 m4_define([SUPPORTED_MATCH_FINDERS], [hc3,hc4,bt2,bt3,bt4])
 192
 193 m4_foreach([NAME], [SUPPORTED_MATCH_FINDERS],
 194 [enable_match_finder_[]NAME=no
 195 ])
 196
 197 AC_MSG_CHECKING([which match finders to build])
 198 AC_ARG_ENABLE([match-finders], AC_HELP_STRING([--enable-match-finders=LIST],
 199                 [Comma-separated list of match finders to build. Default=all.
 200                 At least one match finder is required for encoding with
 201                 the LZMA1 and LZMA2 filters. Available match finders:]
 202                 m4_translit(m4_defn([SUPPORTED_MATCH_FINDERS]), [,], [ ])), [],
 203         [enable_match_finders=SUPPORTED_MATCH_FINDERS])
 204 enable_match_finders=`echo "$enable_match_finders" | sed 's/,/ /g'`
 205 if test "x$enable_encoder_lz" = xyes ; then
 206         for arg in $enable_match_finders
 207                 do
 208                 case $arg in m4_foreach([NAME], [SUPPORTED_MATCH_FINDERS], [
 209                         NAME)
 210                                 enable_match_finder_[]NAME=yes
 211                                 AC_DEFINE(HAVE_MF_[]m4_toupper(NAME), [1],
 212                                 [Define to 1 to enable] NAME [match finder.])
 213                                 ;;])
 214                         *)
 215                                 AC_MSG_RESULT([])
 216                                 AC_MSG_ERROR([unknown match finder: $arg])
 217                                 ;;
 218                 esac
 219         done
 220         AC_MSG_RESULT([$enable_match_finders])
 221 else
 222         AC_MSG_RESULT([(none because not building any LZ-based encoder)])
 223 fi
 224
 225
 226 ####################
 227 # Integrity checks #
 228 ####################
 229
 230 m4_define([SUPPORTED_CHECKS], [crc32,crc64,sha256])
 231
 232 m4_foreach([NAME], [SUPPORTED_FILTERS],
 233 [enable_check_[]NAME=no
 234 ])dnl
 235
 236 AC_MSG_CHECKING([which integrity checks to build])
 237 AC_ARG_ENABLE([checks], AC_HELP_STRING([--enable-checks=LIST],
 238                 [Comma-separated list of integrity checks to build.
 239                 Default=all. Available integrity checks:]
 240                 m4_translit(m4_defn([SUPPORTED_CHECKS]), [,], [ ])),
 241         [], [enable_checks=SUPPORTED_CHECKS])
 242 enable_checks=`echo "$enable_checks" | sed 's/,/ /g'`
 243 if test "x$enable_checks" = xno || test "x$enable_checks" = x; then
 244         AC_MSG_RESULT([(none)])
 245 else
 246         for arg in $enable_checks
 247         do
 248                 case $arg in m4_foreach([NAME], [SUPPORTED_CHECKS], [
 249                         NAME)
 250                                 enable_check_[]NAME=yes
 251                                 AC_DEFINE(HAVE_CHECK_[]m4_toupper(NAME), [1],
 252                                 [Define to 1 if] NAME
 253                                 [integrity check is enabled.])
 254                                 ;;])
 255                         *)
 256                                 AC_MSG_RESULT([])
 257                                 AC_MSG_ERROR([unknown integrity check: $arg])
 258                                 ;;
 259                 esac
 260         done
 261         AC_MSG_RESULT([$enable_checks])
 262 fi
 263 if test "x$enable_checks_crc32" = xno ; then
 264         AC_MSG_ERROR([For now, the CRC32 check must always be enabled.])
 265 fi
 266
 267 m4_foreach([NAME], [SUPPORTED_CHECKS],
 268 [AM_CONDITIONAL(COND_CHECK_[]m4_toupper(NAME), test "x$enable_check_[]NAME" = xyes)
 269 ])dnl
 270
 271
 272 ###########################
 273 # Assembler optimizations #
 274 ###########################
 275
 276 AC_MSG_CHECKING([if assembler optimizations should be used])
 277 AC_ARG_ENABLE([assembler], AC_HELP_STRING([--disable-assembler],
 278                 [Do not use assembler optimizations even if such exist
 279                 for the architecture.]),
 280         [], [enable_assembler=yes])
 281 if test "x$enable_assembler" = xyes; then
 282         case $host_cpu in
 283                 i?86)   enable_assembler=x86 ;;
 284                 x86_64) enable_assembler=x86_64 ;;
 285                 *)      enable_assembler=no ;;
 286         esac
 287 fi
 288 case $enable_assembler in
 289         x86)
 290                 AC_DEFINE([HAVE_ASM_X86], [1],
 291                         [Define to 1 if using x86 assembler optimizations.])
 292                 ;;
 293         x86_64)
 294                 AC_DEFINE([HAVE_ASM_X86_64], [1],
 295                         [Define to 1 if using x86_64 assembler optimizations.])
 296                 ;;
 297         no)
 298                 ;;
 299         *)
 300                 AC_MSG_RESULT([])
 301                 AC_MSG_ERROR([--enable-assembler accepts only \`yes', \`no', \`x86', or \`x86_64'.])
 302                 ;;
 303 esac
 304 AC_MSG_RESULT([$enable_assembler])
 305 AM_CONDITIONAL(COND_ASM_X86, test "x$enable_assembler" = xx86)
 306 AM_CONDITIONAL(COND_ASM_X86_64, test "x$enable_assembler" = xx86_64)
 307
 308
 309 ################################
 310 # Fast unaligned memory access #
 311 ################################
 312
 313 AC_MSG_CHECKING([if unaligned memory access should be used])
 314 AC_ARG_ENABLE([unaligned-access], AC_HELP_STRING([--enable-unaligned-access],
 315                 [Enable if the system supports *fast* unaligned memory access
 316                 with 16-bit and 32-bit integers. By default, this is enabled
 317                 only on x86, x86_64, and big endian PowerPC.]),
 318         [], [enable_unaligned_access=auto])
 319 if test "x$enable_unaligned_access" = xauto ; then
 320         case $host_cpu in
 321                 i?86|x86_64|powerpc|powerpc64)
 322                         enable_unaligned_access=yes
 323                         ;;
 324                 *)
 325                         enable_unaligned_access=no
 326                         ;;
 327         esac
 328 fi
 329 if test "x$enable_unaligned_access" = xyes ; then
 330         AC_DEFINE([HAVE_FAST_UNALIGNED_ACCESS], [1], [Define to 1 if
 331                 the system supports fast unaligned memory access.])
 332         AC_MSG_RESULT([yes])
 333 else
 334         AC_MSG_RESULT([no])
 335 fi
 336
 337
 338 #####################
 339 # Size optimization #
 340 #####################
 341
 342 AC_MSG_CHECKING([if small size is preferred over speed])
 343 AC_ARG_ENABLE([small], AC_HELP_STRING([--enable-small],
 344                 [Make liblzma smaller and a little slower.
 345                 This is disabled by default to optimize for speed.]),
 346         [], [enable_small=no])
 347 if test "x$enable_small" = xyes; then
 348         AC_DEFINE([HAVE_SMALL], [1], [Define to 1 if optimizing for size.])
 349 elif test "x$enable_small" != xno; then
 350         AC_MSG_RESULT([])
 351         AC_MSG_ERROR([--enable-small accepts only \`yes' or \`no'])
 352 fi
 353 AC_MSG_RESULT([$enable_small])
 354 AM_CONDITIONAL(COND_SMALL, test "x$enable_small" = xyes)
 355
 356
 357 #############
 358 # Threading #
 359 #############
 360
 361 AC_MSG_CHECKING([if threading support is wanted])
 362 AC_ARG_ENABLE([threads], AC_HELP_STRING([--disable-threads],
 363                 [Disable threading support.
 364                 This makes some things thread-unsafe.]),
 365         [], [enable_threads=yes])
 366 if test "x$enable_threads" != xyes && test "x$enable_threads" != xno; then
 367         AC_MSG_RESULT([])
 368         AC_MSG_ERROR([--enable-threads accepts only \`yes' or \`no'])
 369 fi
 370 AC_MSG_RESULT([$enable_threads])
 371 # We use the actual result a little later.
 372
 373
 374 ############################################
 375 # xz/xzdec/lzmadec linkage against liblzma #
 376 ############################################
 377
 378 # Link the command line tool statically against liblzma unless using
 379 # --enable-dynamic. Using static liblzma gives a little bit faster executable
 380 # on x86, because no register is wasted for PIC. We also have one dependency
 381 # less, which allows users to more freely copy the xz binary to other boxes.
 382 # However, I wouldn't be surprised if distro maintainers still prefer dynamic
 383 # linking, so let's make it easy for them.
 384
 385 AC_MSG_CHECKING([how command line tools should be linked against liblzma])
 386 AC_ARG_ENABLE([dynamic], [AC_HELP_STRING([--enable-dynamic],
 387                         [Link command line tools dynamically against liblzma.
 388                         The default is to use static liblzma if it was
 389                         built.])],
 390                 [], [enable_dynamic=no])
 391 case $enable_dynamic in
 392         yes)
 393                 STATIC_CPPFLAGS=
 394                 STATIC_LDFLAGS=
 395                 AC_MSG_RESULT([dynamically])
 396                 ;;
 397         no)
 398                 STATIC_CPPFLAGS="-DLZMA_API_STATIC"
 399                 STATIC_LDFLAGS="-static"
 400                 AC_MSG_RESULT([statically])
 401                 ;;
 402         *)
 403                 AC_MSG_RESULT([])
 404                 AC_MSG_ERROR([--enable-dynamic accepts only \`yes' or \`no'])
 405                 ;;
 406 esac
 407 AC_SUBST([STATIC_CPPFLAGS])
 408 AC_SUBST([STATIC_LDFLAGS])
 409
 410
 411 ###############################################################################
 412 # Checks for programs.
 413 ###############################################################################
 414
 415 echo
 416 gl_POSIX_SHELL
 417 if test -z "$POSIX_SHELL" ; then
 418         AC_MSG_ERROR([No POSIX conforming shell (sh) was found.])
 419 fi
 420
 421 echo
 422 echo "Initializing Automake:"
 423
 424 AM_INIT_AUTOMAKE([1.10 foreign tar-v7 filename-length-max=99])
 425 AC_PROG_LN_S
 426
 427 AC_PROG_CC_C99
 428 if test x$ac_cv_prog_cc_c99 = xno ; then
 429         AC_MSG_ERROR([No C99 compiler was found.])
 430 fi
 431
 432 AM_PROG_CC_C_O
 433 AM_PROG_AS
 434 AC_USE_SYSTEM_EXTENSIONS
 435
 436 if test "x$enable_threads" = xyes; then
 437         echo
 438         echo "Threading support:"
 439         ACX_PTHREAD
 440         LIBS="$LIBS $PTHREAD_LIBS"
 441         AM_CFLAGS="$AM_CFLAGS $PTHREAD_CFLAGS"
 442         CC="$PTHREAD_CC"
 443 fi
 444
 445 echo
 446 echo "Initializing Libtool:"
 447 CXX=no
 448 F77=no
 449 AC_LIBTOOL_WIN32_DLL
 450 AC_PROG_LIBTOOL
 451 AC_LIBTOOL_RC
 452
 453 dnl Some day we can drop support for libtool 1.5.x. Then the above five
 454 dnl lines can be replaced with these:
 455 dnl LT_INIT([win32-dll])
 456 dnl LT_LANG([Windows Resource])
 457
 458 # This is a bit wrong since it is possible to request that only some libs
 459 # are built as shared. Using that feature isn't so common though, and this
 460 # breaks only on Windows (at least for now) if the user enables only some
 461 # libs as shared.
 462 AM_CONDITIONAL([COND_SHARED], [test "x$enable_shared" != xno])
 463
 464
 465 ###############################################################################
 466 # Checks for libraries.
 467 ###############################################################################
 468
 469 echo
 470 echo "Initializing gettext:"
 471 AM_GNU_GETTEXT_VERSION([0.16.1])
 472 AM_GNU_GETTEXT([external])
 473
 474 ###############################################################################
 475 # Checks for header files.
 476 ###############################################################################
 477
 478 echo
 479 echo "System headers and functions:"
 480
 481 # There is currently no workarounds in this package if some of
 482 # these headers are missing.
 483 AC_CHECK_HEADERS([fcntl.h limits.h sys/time.h],
 484         [],
 485         [AC_MSG_ERROR([Required header file(s) are missing.])])
 486
 487 # If any of these headers are missing, things should still work correctly:
 488 AC_CHECK_HEADERS([sys/param.h sys/sysctl.h byteswap.h],
 489         [], [], [
 490 #ifdef HAVE_SYS_PARAM_H
 491 #       include <sys/param.h>
 492 #endif
 493 ])
 494
 495 # Even if we have byteswap.h, we may lack the specific macros/functions.
 496 if test x$ac_cv_header_byteswap_h = xyes ; then
 497         m4_foreach([FUNC], [bswap_16,bswap_32,bswap_64], [
 498                 AC_MSG_CHECKING([if FUNC is available])
 499                 AC_LINK_IFELSE([AC_LANG_SOURCE([
 500 #include <byteswap.h>
 501 int
 502 main(void)
 503 {
 504         FUNC[](42);
 505         return 0;
 506 }
 507                 ])], [
 508                         AC_DEFINE(HAVE_[]m4_toupper(FUNC), [1],
 509                                         [Define to 1 if] FUNC [is available.])
 510                         AC_MSG_RESULT([yes])
 511                 ], [AC_MSG_RESULT([no])])
 512
 513         ])dnl
 514 fi
 515
 516
 517 ###############################################################################
 518 # Checks for typedefs, structures, and compiler characteristics.
 519 ###############################################################################
 520
 521 dnl We don't need these as long as we need a C99 compiler anyway.
 522 dnl AC_C_INLINE
 523 dnl AC_C_RESTRICT
 524
 525 AC_HEADER_STDBOOL
 526
 527 AC_TYPE_UINT8_T
 528 AC_TYPE_UINT16_T
 529 AC_TYPE_INT32_T
 530 AC_TYPE_UINT32_T
 531 AC_TYPE_INT64_T
 532 AC_TYPE_UINT64_T
 533 AC_TYPE_UINTPTR_T
 534
 535 AC_CHECK_SIZEOF([size_t])
 536
 537 # The command line tool can copy high resolution timestamps if such
 538 # information is availabe in struct stat. Otherwise one second accuracy
 539 # is used.
 540 AC_CHECK_MEMBERS([
 541         struct stat.st_atim.tv_nsec,
 542         struct stat.st_atimespec.tv_nsec,
 543         struct stat.st_atimensec,
 544         struct stat.st_uatime,
 545         struct stat.st_atim.st__tim.tv_nsec])
 546
 547 AC_SYS_LARGEFILE
 548 AC_C_BIGENDIAN
 549
 550
 551 ###############################################################################
 552 # Checks for library functions.
 553 ###############################################################################
 554
 555 # Gnulib replacements as needed
 556 gl_GETOPT
 557
 558 # Find the best function to set timestamps.
 559 AC_CHECK_FUNCS([futimens futimes futimesat utimes utime], [break])
 560
 561 lc_PHYSMEM
 562 lc_CPUCORES
 563
 564
 565 ###############################################################################
 566 # If using GCC, set some additional AM_CFLAGS:
 567 ###############################################################################
 568
 569 if test "$GCC" = yes ; then
 570         echo
 571         echo "GCC extensions:"
 572 fi
 573
 574 # Always do the visibility check but don't set AM_CFLAGS on Windows.
 575 # This way things get set properly even on Windows.
 576 gl_VISIBILITY
 577 if test -n "$CFLAG_VISIBILITY" && test "$is_w32" = no; then
 578         AM_CFLAGS="$AM_CFLAGS $CFLAG_VISIBILITY"
 579 fi
 580
 581 if test "$GCC" = yes ; then
 582         # Enable as much warnings as possible. These commented warnings won't
 583         # work for this package though:
 584         #   * -Wunreachable-code breaks several assert(0) cases, which are
 585         #     backed up with "return LZMA_PROG_ERROR".
 586         #   * -Wcast-qual would break various things where we need a non-const
 587         #     pointer although we don't modify anything through it.
 588         #   * -Wcast-align breaks optimized CRC32 and CRC64 implementation
 589         #     on some architectures (not on x86), where this warning is bogus,
 590         #     because we take care of correct alignment.
 591         #   * -Winline, -Wdisabled-optimization, -Wunsafe-loop-optimizations
 592         #     don't seem so useful here; at least the last one gives some
 593         #     warnings which are not bugs.
 594         for NEW_FLAG in \
 595                         -Wall \
 596                         -Wextra \
 597                         -Wformat=2 \
 598                         -Winit-self \
 599                         -Wmissing-include-dirs \
 600                         -Wstrict-aliasing \
 601                         -Wfloat-equal \
 602                         -Wundef \
 603                         -Wshadow \
 604                         -Wpointer-arith \
 605                         -Wbad-function-cast \
 606                         -Wwrite-strings \
 607                         -Wlogical-op \
 608                         -Waggregate-return \
 609                         -Wstrict-prototypes \
 610                         -Wold-style-definition \
 611                         -Wmissing-prototypes \
 612                         -Wmissing-declarations \
 613                         -Wmissing-noreturn \
 614                         -Wredundant-decls
 615         do
 616                 AC_MSG_CHECKING([if $CC accepts $NEW_FLAG])
 617                 OLD_CFLAGS="$CFLAGS"
 618                 CFLAGS="$CFLAGS $NEW_FLAG"
 619                 AC_COMPILE_IFELSE([void foo(void) { }], [
 620                         AM_CFLAGS="$AM_CFLAGS $NEW_FLAG"
 621                         AC_MSG_RESULT([yes])
 622                 ], [
 623                         AC_MSG_RESULT([no])
 624                 ])
 625                 CFLAGS="$OLD_CFLAGS"
 626         done
 627
 628         AC_ARG_ENABLE([werror],
 629                 AC_HELP_STRING([--enable-werror], [Enable -Werror to abort
 630                         compilation on all compiler warnings.]),
 631                 [], [enable_werror=no])
 632         if test "x$enable_werror" = "xyes"; then
 633                 AM_CFLAGS="$AM_CFLAGS -Werror"
 634         fi
 635 fi
 636
 637
 638 ###############################################################################
 639 # Create the makefiles and config.h
 640 ###############################################################################
 641
 642 echo
 643
 644 # Don't build the lib directory at all if we don't need any replacement
 645 # functions.
 646 AM_CONDITIONAL([COND_GNULIB], test -n "$LIBOBJS")
 647
 648 # Add default AM_CFLAGS.
 649 AC_SUBST([AM_CFLAGS])
 650
 651 # This is needed for src/scripts.
 652 xz=`echo xz | sed "$program_transform_name"`
 653 AC_SUBST([xz])
 654
 655 AC_CONFIG_FILES([
 656         Doxyfile
 657         Makefile
 658         po/Makefile.in
 659         lib/Makefile
 660         src/Makefile
 661         src/liblzma/liblzma.pc
 662         src/liblzma/Makefile
 663         src/liblzma/api/Makefile
 664         src/xz/Makefile
 665         src/xzdec/Makefile
 666         src/scripts/Makefile
 667         src/scripts/xzdiff
 668         src/scripts/xzgrep
 669         src/scripts/xzmore
 670         src/scripts/xzless
 671         tests/Makefile
 672         debug/Makefile
 673 ])
 674
 675 AC_OUTPUT