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Annotation of embedaddon/libiconv/srcm4/largefile.m4, revision 1.1

1.1     ! misho       1: # Enable large files on systems where this is not the default.
        !             2: 
        !             3: # Copyright 1992-1996, 1998-2011 Free Software Foundation, Inc.
        !             4: # This file is free software; the Free Software Foundation
        !             5: # gives unlimited permission to copy and/or distribute it,
        !             6: # with or without modifications, as long as this notice is preserved.
        !             7: 
        !             8: # The following implementation works around a problem in autoconf <= 2.68;
        !             9: # AC_SYS_LARGEFILE does not configure for large inodes on Mac OS X 10.5.
        !            10: m4_version_prereq([2.69], [] ,[
        !            11: 
        !            12: # _AC_SYS_LARGEFILE_TEST_INCLUDES
        !            13: # -------------------------------
        !            14: m4_define([_AC_SYS_LARGEFILE_TEST_INCLUDES],
        !            15: [@%:@include <sys/types.h>
        !            16:  /* Check that off_t can represent 2**63 - 1 correctly.
        !            17:     We can't simply define LARGE_OFF_T to be 9223372036854775807,
        !            18:     since some C++ compilers masquerading as C compilers
        !            19:     incorrectly reject 9223372036854775807.  */
        !            20: @%:@define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
        !            21:   int off_t_is_large[[(LARGE_OFF_T % 2147483629 == 721
        !            22:                       && LARGE_OFF_T % 2147483647 == 1)
        !            23:                      ? 1 : -1]];[]dnl
        !            24: ])
        !            25: 
        !            26: 
        !            27: # _AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE,
        !            28: #                              CACHE-VAR,
        !            29: #                              DESCRIPTION,
        !            30: #                              PROLOGUE, [FUNCTION-BODY])
        !            31: # --------------------------------------------------------
        !            32: m4_define([_AC_SYS_LARGEFILE_MACRO_VALUE],
        !            33: [AC_CACHE_CHECK([for $1 value needed for large files], [$3],
        !            34: [while :; do
        !            35:   m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
        !            36:     [AC_LANG_PROGRAM([$5], [$6])],
        !            37:     [$3=no; break])
        !            38:   m4_ifval([$6], [AC_LINK_IFELSE], [AC_COMPILE_IFELSE])(
        !            39:     [AC_LANG_PROGRAM([@%:@define $1 $2
        !            40: $5], [$6])],
        !            41:     [$3=$2; break])
        !            42:   $3=unknown
        !            43:   break
        !            44: done])
        !            45: case $$3 in #(
        !            46:   no | unknown) ;;
        !            47:   *) AC_DEFINE_UNQUOTED([$1], [$$3], [$4]);;
        !            48: esac
        !            49: rm -rf conftest*[]dnl
        !            50: ])# _AC_SYS_LARGEFILE_MACRO_VALUE
        !            51: 
        !            52: 
        !            53: # AC_SYS_LARGEFILE
        !            54: # ----------------
        !            55: # By default, many hosts won't let programs access large files;
        !            56: # one must use special compiler options to get large-file access to work.
        !            57: # For more details about this brain damage please see:
        !            58: # http://www.unix-systems.org/version2/whatsnew/lfs20mar.html
        !            59: AC_DEFUN([AC_SYS_LARGEFILE],
        !            60: [AC_ARG_ENABLE(largefile,
        !            61:               [  --disable-largefile     omit support for large files])
        !            62: if test "$enable_largefile" != no; then
        !            63: 
        !            64:   AC_CACHE_CHECK([for special C compiler options needed for large files],
        !            65:     ac_cv_sys_largefile_CC,
        !            66:     [ac_cv_sys_largefile_CC=no
        !            67:      if test "$GCC" != yes; then
        !            68:        ac_save_CC=$CC
        !            69:        while :; do
        !            70:         # IRIX 6.2 and later do not support large files by default,
        !            71:         # so use the C compiler's -n32 option if that helps.
        !            72:         AC_LANG_CONFTEST([AC_LANG_PROGRAM([_AC_SYS_LARGEFILE_TEST_INCLUDES])])
        !            73:         AC_COMPILE_IFELSE([], [break])
        !            74:         CC="$CC -n32"
        !            75:         AC_COMPILE_IFELSE([], [ac_cv_sys_largefile_CC=' -n32'; break])
        !            76:         break
        !            77:        done
        !            78:        CC=$ac_save_CC
        !            79:        rm -f conftest.$ac_ext
        !            80:     fi])
        !            81:   if test "$ac_cv_sys_largefile_CC" != no; then
        !            82:     CC=$CC$ac_cv_sys_largefile_CC
        !            83:   fi
        !            84: 
        !            85:   _AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
        !            86:     ac_cv_sys_file_offset_bits,
        !            87:     [Number of bits in a file offset, on hosts where this is settable.],
        !            88:     [_AC_SYS_LARGEFILE_TEST_INCLUDES])
        !            89:   if test $ac_cv_sys_file_offset_bits = unknown; then
        !            90:     _AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
        !            91:       ac_cv_sys_large_files,
        !            92:       [Define for large files, on AIX-style hosts.],
        !            93:       [_AC_SYS_LARGEFILE_TEST_INCLUDES])
        !            94:   fi
        !            95: 
        !            96:   AH_VERBATIM([_DARWIN_USE_64_BIT_INODE],
        !            97: [/* Enable large inode numbers on Mac OS X.  */
        !            98: #ifndef _DARWIN_USE_64_BIT_INODE
        !            99: # define _DARWIN_USE_64_BIT_INODE 1
        !           100: #endif])
        !           101: fi
        !           102: ])# AC_SYS_LARGEFILE
        !           103: 
        !           104: ])# m4_version_prereq 2.69