Chris@0: dnl By default, many hosts won't let programs access large files;
Chris@0: dnl one must use special compiler options to get large-file access to work.
Chris@0: dnl For more details about this brain damage please see:
Chris@0: dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
Chris@0: 
Chris@0: dnl Written by Paul Eggert <eggert@twinsun.com>.
Chris@0: 
Chris@0: dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
Chris@0: dnl MN_SYS_EXTRA_LARGEFILE_FLAGS(FLAGSNAME)
Chris@0: AC_DEFUN([MN_SYS_EXTRA_LARGEFILE_FLAGS],
Chris@0:   [AC_CACHE_CHECK([for $1 value to request large file support],
Chris@0:      ac_cv_sys_largefile_$1,
Chris@0:      [ac_cv_sys_largefile_$1=`($GETCONF LFS_$1) 2>/dev/null` || {
Chris@0: 	ac_cv_sys_largefile_$1=no
Chris@0: 	ifelse($1, CFLAGS,
Chris@0: 	  [case "$host_os" in
Chris@0: 	   # IRIX 6.2 and later require cc -n32.
Chris@0: changequote(, )dnl
Chris@0: 	   irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)
Chris@0: changequote([, ])dnl
Chris@0: 	     if test "$GCC" != yes; then
Chris@0: 	       ac_cv_sys_largefile_CFLAGS=-n32
Chris@0: 	     fi
Chris@0: 	     ac_save_CC="$CC"
Chris@0: 	     CC="$CC $ac_cv_sys_largefile_CFLAGS"
Chris@0: 	     AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)
Chris@0: 	     CC="$ac_save_CC"
Chris@0: 	   esac])
Chris@0:       }])])
Chris@0: 
Chris@0: dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
Chris@0: dnl AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(VAR, VAL)
Chris@0: AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND],
Chris@0:   [case $2 in
Chris@0:    no) ;;
Chris@0:    ?*)
Chris@0:      case "[$]$1" in
Chris@0:      '') $1=$2 ;;
Chris@0:      *) $1=[$]$1' '$2 ;;
Chris@0:      esac ;;
Chris@0:    esac])
Chris@0: 
Chris@0: dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
Chris@0: dnl AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
Chris@0: AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE],
Chris@0:   [AC_CACHE_CHECK([for $1], $2,
Chris@0:      [$2=no
Chris@0: changequote(, )dnl
Chris@0:       $4
Chris@0:       for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
Chris@0: 	case "$ac_flag" in
Chris@0: 	-D$1)
Chris@0: 	  $2=1 ;;
Chris@0: 	-D$1=*)
Chris@0: 	  $2=`expr " $ac_flag" : '[^=]*=\(.*\)'` ;;
Chris@0: 	esac
Chris@0:       done
Chris@0: changequote([, ])dnl
Chris@0:       ])
Chris@0:    if test "[$]$2" != no; then
Chris@0:      AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
Chris@0:    fi])
Chris@0: 
Chris@0: AC_DEFUN([AC_SYS_EXTRA_LARGEFILE],
Chris@0:   [AC_REQUIRE([AC_CANONICAL_HOST])
Chris@0:    AC_ARG_ENABLE(largefile,
Chris@0:      [  --disable-largefile     omit support for large files])
Chris@0:    if test "$enable_largefile" != no; then
Chris@0:      AC_CHECK_TOOL(GETCONF, getconf)
Chris@0:      MN_SYS_EXTRA_LARGEFILE_FLAGS(CFLAGS)
Chris@0:      MN_SYS_EXTRA_LARGEFILE_FLAGS(LDFLAGS)
Chris@0:      MN_SYS_EXTRA_LARGEFILE_FLAGS(LIBS)
Chris@0: 	
Chris@0:      for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
Chris@0:        case "$ac_flag" in
Chris@0:        no) ;;
Chris@0:        -D_FILE_OFFSET_BITS=*) ;;
Chris@0:        -D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;
Chris@0:        -D_LARGE_FILES | -D_LARGE_FILES=*) ;;
Chris@0:        -D?* | -I?*)
Chris@0: 	 AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;
Chris@0:        *)
Chris@0: 	 AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;
Chris@0:        esac
Chris@0:      done
Chris@0:      AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")
Chris@0:      AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")
Chris@0:      AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,
Chris@0:        ac_cv_sys_file_offset_bits,
Chris@0:        [Number of bits in a file offset, on hosts where this is settable.])
Chris@0:        [case "$host_os" in
Chris@0: 	# HP-UX 10.20 and later
Chris@0: 	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
Chris@0: 	  ac_cv_sys_file_offset_bits=64 ;;
Chris@0: 	esac]
Chris@0:      AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,
Chris@0:        ac_cv_sys_largefile_source,
Chris@0:        [Define to make fseeko etc. visible, on some hosts.],
Chris@0:        [case "$host_os" in
Chris@0: 	# HP-UX 10.20 and later
Chris@0: 	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
Chris@0: 	  ac_cv_sys_largefile_source=1 ;;
Chris@0: 	esac])
Chris@0:      AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGE_FILES,
Chris@0:        ac_cv_sys_large_files,
Chris@0:        [Define for large files, on AIX-style hosts.],
Chris@0:        [case "$host_os" in
Chris@0: 	# AIX 4.2 and later
Chris@0: 	aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)
Chris@0: 	  ac_cv_sys_large_files=1 ;;
Chris@0: 	esac])
Chris@0:    fi
Chris@0:   ])
Chris@0: