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93 lines
3.3 KiB
Plaintext
93 lines
3.3 KiB
Plaintext
#serial 19
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dnl By default, many hosts won't let programs access large files;
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dnl one must use special compiler options to get large-file access to work.
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dnl For more details about this brain damage please see:
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dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
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dnl Written by Paul Eggert <eggert@twinsun.com>.
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dnl Internal subroutine of AC_SYS_LARGEFILE.
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dnl AC_SYS_LARGEFILE_TEST_INCLUDES
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AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,
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[[#include <sys/types.h>
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/* Check that off_t can represent 2**63 - 1 correctly.
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We can't simply "#define LARGE_OFF_T 9223372036854775807",
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since some C++ compilers masquerading as C compilers
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incorrectly reject 9223372036854775807. */
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# define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
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int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
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&& LARGE_OFF_T % 2147483647 == 1)
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? 1 : -1];
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]])
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dnl Internal subroutine of AC_SYS_LARGEFILE.
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dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, FUNCTION-BODY)
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AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,
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[AC_CACHE_CHECK([for $1 value needed for large files], $3,
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[$3=no
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AC_TRY_COMPILE([$5],
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[$6],
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,
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[AC_TRY_COMPILE([#define $1 $2]
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[$5]
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,
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[$6],
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[$3=$2])])])
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if test "[$]$3" != no; then
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AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
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fi])
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AC_DEFUN(AC_SYS_LARGEFILE,
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[AC_REQUIRE([AC_PROG_CC])
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AC_ARG_ENABLE(largefile,
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[ --disable-largefile omit support for large files])
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if test "$enable_largefile" != no; then
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AC_CACHE_CHECK([for special C compiler options needed for large files],
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ac_cv_sys_largefile_CC,
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[ac_cv_sys_largefile_CC=no
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if test "$GCC" != yes; then
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# IRIX 6.2 and later do not support large files by default,
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# so use the C compiler's -n32 option if that helps.
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AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,
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[ac_save_CC="$CC"
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CC="$CC -n32"
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AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,
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ac_cv_sys_largefile_CC=' -n32')
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CC="$ac_save_CC"])
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fi])
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if test "$ac_cv_sys_largefile_CC" != no; then
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CC="$CC$ac_cv_sys_largefile_CC"
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fi
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AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
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ac_cv_sys_file_offset_bits,
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[Number of bits in a file offset, on hosts where this is settable.],
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AC_SYS_LARGEFILE_TEST_INCLUDES)
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AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
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ac_cv_sys_large_files,
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[Define for large files, on AIX-style hosts.],
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AC_SYS_LARGEFILE_TEST_INCLUDES)
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fi
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])
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AC_DEFUN(AC_FUNC_FSEEKO,
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[AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
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ac_cv_sys_largefile_source,
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[Define to make fseeko visible on some hosts (e.g. glibc 2.2).],
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[#include <stdio.h>], [return !fseeko;])
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# We used to try defining _XOPEN_SOURCE=500 too, to work around a bug
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# in glibc 2.1.3, but that breaks too many other things.
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# If you want fseeko and ftello with glibc, upgrade to a fixed glibc.
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AC_CACHE_CHECK([for fseeko], ac_cv_func_fseeko,
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[ac_cv_func_fseeko=no
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AC_TRY_LINK([#include <stdio.h>],
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[return fseeko && fseeko (stdin, 0, 0);],
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[ac_cv_func_fseeko=yes])])
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if test $ac_cv_func_fseeko != no; then
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AC_DEFINE(HAVE_FSEEKO, 1,
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[Define if fseeko (and presumably ftello) exists and is declared.])
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fi])
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