~drizzle-trunk/drizzle/development

dnl By default, many hosts wont let programs access large files;

dnl one must use special compiler options to get large-file access to work.

dnl For more details about this brain damage please see:

dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html

dnl Written by Paul Eggert <eggert@twinsun.com>.

dnl Internal subroutine of AC_SYS_LARGEFILE.

dnl AC_SYS_LARGEFILE_FLAGS(FLAGSNAME)

AC_DEFUN([AC_SYS_LARGEFILE_FLAGS],

  [AC_CACHE_CHECK([for $1 value to request large file support],

     ac_cv_sys_largefile_$1,

     [if ($GETCONF LFS_$1) >conftest.1 2>conftest.2 && test ! -s conftest.2

      then

        ac_cv_sys_largefile_$1=`cat conftest.1`

      else

	ac_cv_sys_largefile_$1=no

	ifelse($1, CFLAGS,

	  [case "$host_os" in

	   # HP-UX 10.20 requires -D__STDC_EXT__ with gcc 2.95.1.

changequote(, )dnl

	   hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)

changequote([, ])dnl

	     if test "$GCC" = yes; then

	        case `$CC --version 2>/dev/null` in

	          2.95.*) ac_cv_sys_largefile_CFLAGS=-D__STDC_EXT__ ;;

		esac

	     fi

	     ;;

	   # IRIX 6.2 and later require cc -n32.

changequote(, )dnl

	   irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)

changequote([, ])dnl

	     if test "$GCC" != yes; then

	       ac_cv_sys_largefile_CFLAGS=-n32

	     fi

	   esac

	   if test "$ac_cv_sys_largefile_CFLAGS" != no; then

	     ac_save_CC="$CC"

	     CC="$CC $ac_cv_sys_largefile_CFLAGS"

	     AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)

	     CC="$ac_save_CC"

	   fi])

      fi

      rm -f conftest*])])

dnl Internal subroutine of AC_SYS_LARGEFILE.

dnl AC_SYS_LARGEFILE_SPACE_APPEND(VAR, VAL)

AC_DEFUN([AC_SYS_LARGEFILE_SPACE_APPEND],

  [case $2 in

   no) ;;

   ?*)

     case "[$]$1" in

     '') $1=$2 ;;

     *) $1=[$]$1' '$2 ;;

     esac ;;

   esac])

dnl Internal subroutine of AC_SYS_LARGEFILE.

dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)

AC_DEFUN([AC_SYS_LARGEFILE_MACRO_VALUE],

  [AC_CACHE_CHECK([for $1], $2,

     [$2=no

changequote(, )dnl

      for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do

	case "$ac_flag" in

	-D$1)

	  $2=1 ;;

	-D$1=*)

	  $2=`expr " $ac_flag" : '[^=]*=\(.*\)'` ;;

	esac

      done

      $4

changequote([, ])dnl

      ])

   if test "[$]$2" != no; then

     AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])

   fi])

AC_DEFUN([DRIZZLE_SYS_LARGEFILE],

  [AC_REQUIRE([AC_CANONICAL_HOST])

      AC_ARG_ENABLE([largefile],

	  [AS_HELP_STRING([--disable-largefile],

		  [Omit support for large files])])

   if test "$enable_largefile" != no; then

     AC_CHECK_TOOL(GETCONF, getconf)

     AC_SYS_LARGEFILE_FLAGS(CFLAGS)

     AC_SYS_LARGEFILE_FLAGS(LDFLAGS)

     AC_SYS_LARGEFILE_FLAGS(LIBS)

     for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do

       case "$ac_flag" in

       no) ;;

       -D_FILE_OFFSET_BITS=*) ;;

       -D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;

       -D_LARGE_FILES | -D_LARGE_FILES=*) ;;

       -D?* | -I?*)

	 AC_SYS_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;

       *)

	 AC_SYS_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;

       esac

     done

     AC_SYS_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")

     AC_SYS_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")

     AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,

       ac_cv_sys_file_offset_bits,

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

       [case "$host_os" in

	# HP-UX 10.20 and later

	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)

	  ac_cv_sys_file_offset_bits=64 ;;

	# We can't declare _FILE_OFFSET_BITS here as this will cause

	# compile errors as AC_PROG_CC adds include files in confdefs.h

	# We solve this (until autoconf is fixed) by instead declaring it

	# as define instead

	solaris2.[8,9])

	  CFLAGS="$CFLAGS -D_FILE_OFFSET_BITS=64"

	  CXXFLAGS="$CXXFLAGS -D_FILE_OFFSET_BITS=64"

	  ac_cv_sys_file_offset_bits=no ;;

	esac])

     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,

       ac_cv_sys_largefile_source,

       [makes fseeko etc. visible, on some hosts.],

       [case "$host_os" in

	# HP-UX 10.20 and later

	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)

	  ac_cv_sys_largefile_source=1 ;;

	esac])

     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES,

       ac_cv_sys_large_files,

       [Large files support on AIX-style hosts.],

       [case "$host_os" in

       # Large file support on AIX is available starting from version 4.2

       # Tested only on 5.2 and up

       aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)

         ac_cv_sys_large_files=1 ;;

       esac])

   fi

  ])