| 1 | #serial 12
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| 2 |
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| 3 | dnl By default, many hosts won't let programs access large files;
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| 4 | dnl one must use special compiler options to get large-file access to work.
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| 5 | dnl For more details about this brain damage please see:
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| 6 | dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
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| 7 |
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| 8 | dnl Written by Paul Eggert <eggert@twinsun.com>.
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| 9 |
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| 10 | dnl Internal subroutine of AC_SYS_LARGEFILE.
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| 11 | dnl AC_SYS_LARGEFILE_TEST_INCLUDES
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| 12 | AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,
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| 13 | [[#include <sys/types.h>
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| 14 | int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1];
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| 15 | ]])
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| 16 |
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| 17 | dnl Internal subroutine of AC_SYS_LARGEFILE.
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| 18 | dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, FUNCTION-BODY)
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| 19 | AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,
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| 20 | [AC_CACHE_CHECK([for $1 value needed for large files], $3,
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| 21 | [$3=no
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| 22 | AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES
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| 23 | $5
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| 24 | ,
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| 25 | [$6],
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| 26 | ,
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| 27 | [AC_TRY_COMPILE([#define $1 $2]
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| 28 | AC_SYS_LARGEFILE_TEST_INCLUDES
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| 29 | $5
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| 30 | ,
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| 31 | [$6],
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| 32 | [$3=$2])])])
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| 33 | if test "[$]$3" != no; then
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| 34 | AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
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| 35 | fi])
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| 36 |
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| 37 | AC_DEFUN(AC_SYS_LARGEFILE,
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| 38 | [AC_ARG_ENABLE(largefile,
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| 39 | [ --disable-largefile omit support for large files])
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| 40 | if test "$enable_largefile" != no; then
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| 41 |
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| 42 | AC_CACHE_CHECK([for special C compiler options needed for large files],
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| 43 | ac_cv_sys_largefile_CC,
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| 44 | [ac_cv_sys_largefile_CC=no
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| 45 | if test "$GCC" != yes; then
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| 46 | # IRIX 6.2 and later do not support large files by default,
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| 47 | # so use the C compiler's -n32 option if that helps.
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| 48 | AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,
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| 49 | [ac_save_CC="$CC"
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| 50 | CC="$CC -n32"
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| 51 | AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,
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| 52 | ac_cv_sys_largefile_CC=' -n32')
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| 53 | CC="$ac_save_CC"])
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| 54 | fi])
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| 55 | if test "$ac_cv_sys_largefile_CC" != no; then
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| 56 | CC="$CC$ac_cv_sys_largefile_CC"
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| 57 | fi
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| 58 |
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| 59 | AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
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| 60 | ac_cv_sys_file_offset_bits,
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| 61 | [Number of bits in a file offset, on hosts where this is settable.])
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| 62 | AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
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| 63 | ac_cv_sys_largefile_source,
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| 64 | [Define to make ftello visible on some hosts (e.g. HP-UX 10.20).],
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| 65 | [#include <stdio.h>], [return !ftello;])
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| 66 | AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
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| 67 | ac_cv_sys_large_files,
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| 68 | [Define for large files, on AIX-style hosts.])
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| 69 | AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500,
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| 70 | ac_cv_sys_xopen_source,
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| 71 | [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).],
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| 72 | [#include <stdio.h>], [return !ftello;])
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| 73 | fi
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| 74 | ])
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