Commit 8755c44d authored by Daniel Stenberg's avatar Daniel Stenberg
Browse files

Albert Chin's patch posted to the mailing list 19 Apr 2001

parent 5dd1cb06

acinclude.m4

+36 −19
Original line number Diff line number Diff line 
#serial 12

#serial 19



dnl By default, many hosts won't let programs access large files;

dnl one must use special compiler options to get large-file access to work.
@@ -11,7 +11,14 @@ dnl Internal subroutine of AC_SYS_LARGEFILE. 
dnl AC_SYS_LARGEFILE_TEST_INCLUDES

AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,

  [[#include <sys/types.h>

    int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1];

    /* Check that off_t can represent 2**63 - 1 correctly.

       We can't simply "#define LARGE_OFF_T 9223372036854775807",

       since some C++ compilers masquerading as C compilers

       incorrectly reject 9223372036854775807.  */

#   define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))

    int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721

			&& LARGE_OFF_T % 2147483647 == 1)

		       ? 1 : -1];

  ]])



dnl Internal subroutine of AC_SYS_LARGEFILE.
@@ -19,14 +26,11 @@ dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, F 
AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,

  [AC_CACHE_CHECK([for $1 value needed for large files], $3,

     [$3=no

      AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES

$5

        ,

      AC_TRY_COMPILE([$5],

	[$6], 

	,

	[AC_TRY_COMPILE([#define $1 $2]

AC_SYS_LARGEFILE_TEST_INCLUDES

$5

[$5]

	   ,

	   [$6],

	   [$3=$2])])])
@@ -35,7 +39,8 @@ $5 
   fi])



AC_DEFUN(AC_SYS_LARGEFILE,

  [AC_ARG_ENABLE(largefile,

  [AC_REQUIRE([AC_PROG_CC])

   AC_ARG_ENABLE(largefile,

     [  --disable-largefile     omit support for large files])

   if test "$enable_largefile" != no; then
@@ -58,18 +63,30 @@ AC_DEFUN(AC_SYS_LARGEFILE, 


     AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,

       ac_cv_sys_file_offset_bits,

       [Number of bits in a file offset, on hosts where this is settable.])

     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,

       ac_cv_sys_largefile_source,

       [Define to make ftello visible on some hosts (e.g. HP-UX 10.20).],

       [#include <stdio.h>], [return !ftello;])

       [Number of bits in a file offset, on hosts where this is settable.],

       AC_SYS_LARGEFILE_TEST_INCLUDES)

     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,

       ac_cv_sys_large_files,

       [Define for large files, on AIX-style hosts.])

dnl	lftp does not need ftello, and _XOPEN_SOURCE=500 makes resolv.h fail.

dnl     AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500,

dnl       ac_cv_sys_xopen_source,

dnl       [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).],

dnl       [#include <stdio.h>], [return !ftello;])

       [Define for large files, on AIX-style hosts.],

       AC_SYS_LARGEFILE_TEST_INCLUDES)

   fi

  ])



AC_DEFUN(AC_FUNC_FSEEKO,

  [AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,

     ac_cv_sys_largefile_source,

     [Define to make fseeko visible on some hosts (e.g. glibc 2.2).],

     [#include <stdio.h>], [return !fseeko;])

   # We used to try defining _XOPEN_SOURCE=500 too, to work around a bug

   # in glibc 2.1.3, but that breaks too many other things.

   # If you want fseeko and ftello with glibc, upgrade to a fixed glibc.



   AC_CACHE_CHECK([for fseeko], ac_cv_func_fseeko,

     [ac_cv_func_fseeko=no

      AC_TRY_LINK([#include <stdio.h>],

        [return fseeko && fseeko (stdin, 0, 0);],

	[ac_cv_func_fseeko=yes])])

   if test $ac_cv_func_fseeko != no; then

     AC_DEFINE(HAVE_FSEEKO, 1,

       [Define if fseeko (and presumably ftello) exists and is declared.])

   fi])