cannam@85: dnl By default, many hosts won't let programs access large files;
cannam@85: dnl one must use special compiler options to get large-file access to work.
cannam@85: dnl For more details about this brain damage please see:
cannam@85: dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
cannam@85: 
cannam@85: dnl Written by Paul Eggert <eggert@twinsun.com>.
cannam@85: 
cannam@85: dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
cannam@85: dnl MN_SYS_EXTRA_LARGEFILE_FLAGS(FLAGSNAME)
cannam@85: AC_DEFUN([MN_SYS_EXTRA_LARGEFILE_FLAGS],
cannam@85:   [AC_CACHE_CHECK([for $1 value to request large file support],
cannam@85:      ac_cv_sys_largefile_$1,
cannam@85:      [ac_cv_sys_largefile_$1=`($GETCONF LFS_$1) 2>/dev/null` || {
cannam@85: 	ac_cv_sys_largefile_$1=no
cannam@85: 	ifelse($1, CFLAGS,
cannam@85: 	  [case "$host_os" in
cannam@85: 	   # IRIX 6.2 and later require cc -n32.
cannam@85: changequote(, )dnl
cannam@85: 	   irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)
cannam@85: changequote([, ])dnl
cannam@85: 	     if test "$GCC" != yes; then
cannam@85: 	       ac_cv_sys_largefile_CFLAGS=-n32
cannam@85: 	     fi
cannam@85: 	     ac_save_CC="$CC"
cannam@85: 	     CC="$CC $ac_cv_sys_largefile_CFLAGS"
cannam@85: 	     AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)
cannam@85: 	     CC="$ac_save_CC"
cannam@85: 	   esac])
cannam@85:       }])])
cannam@85: 
cannam@85: dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
cannam@85: dnl AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(VAR, VAL)
cannam@85: AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND],
cannam@85:   [case $2 in
cannam@85:    no) ;;
cannam@85:    ?*)
cannam@85:      case "[$]$1" in
cannam@85:      '') $1=$2 ;;
cannam@85:      *) $1=[$]$1' '$2 ;;
cannam@85:      esac ;;
cannam@85:    esac])
cannam@85: 
cannam@85: dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
cannam@85: dnl AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
cannam@85: AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE],
cannam@85:   [AC_CACHE_CHECK([for $1], $2,
cannam@85:      [$2=no
cannam@85: changequote(, )dnl
cannam@85:       $4
cannam@85:       for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
cannam@85: 	case "$ac_flag" in
cannam@85: 	-D$1)
cannam@85: 	  $2=1 ;;
cannam@85: 	-D$1=*)
cannam@85: 	  $2=`expr " $ac_flag" : '[^=]*=\(.*\)'` ;;
cannam@85: 	esac
cannam@85:       done
cannam@85: changequote([, ])dnl
cannam@85:       ])
cannam@85:    if test "[$]$2" != no; then
cannam@85:      AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
cannam@85:    fi])
cannam@85: 
cannam@85: AC_DEFUN([AC_SYS_EXTRA_LARGEFILE],
cannam@85:   [AC_REQUIRE([AC_CANONICAL_HOST])
cannam@85:    AC_ARG_ENABLE(largefile,
cannam@85:      [  --disable-largefile     omit support for large files])
cannam@85:    if test "$enable_largefile" != no; then
cannam@85:      AC_CHECK_TOOL(GETCONF, getconf)
cannam@85:      MN_SYS_EXTRA_LARGEFILE_FLAGS(CFLAGS)
cannam@85:      MN_SYS_EXTRA_LARGEFILE_FLAGS(LDFLAGS)
cannam@85:      MN_SYS_EXTRA_LARGEFILE_FLAGS(LIBS)
cannam@85: 	
cannam@85:      for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
cannam@85:        case "$ac_flag" in
cannam@85:        no) ;;
cannam@85:        -D_FILE_OFFSET_BITS=*) ;;
cannam@85:        -D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;
cannam@85:        -D_LARGE_FILES | -D_LARGE_FILES=*) ;;
cannam@85:        -D?* | -I?*)
cannam@85: 	 AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;
cannam@85:        *)
cannam@85: 	 AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;
cannam@85:        esac
cannam@85:      done
cannam@85:      AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")
cannam@85:      AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")
cannam@85:      AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,
cannam@85:        ac_cv_sys_file_offset_bits,
cannam@85:        [Number of bits in a file offset, on hosts where this is settable.])
cannam@85:        [case "$host_os" in
cannam@85: 	# HP-UX 10.20 and later
cannam@85: 	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
cannam@85: 	  ac_cv_sys_file_offset_bits=64 ;;
cannam@85: 	esac]
cannam@85:      AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,
cannam@85:        ac_cv_sys_largefile_source,
cannam@85:        [Define to make fseeko etc. visible, on some hosts.],
cannam@85:        [case "$host_os" in
cannam@85: 	# HP-UX 10.20 and later
cannam@85: 	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
cannam@85: 	  ac_cv_sys_largefile_source=1 ;;
cannam@85: 	esac])
cannam@85:      AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGE_FILES,
cannam@85:        ac_cv_sys_large_files,
cannam@85:        [Define for large files, on AIX-style hosts.],
cannam@85:        [case "$host_os" in
cannam@85: 	# AIX 4.2 and later
cannam@85: 	aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)
cannam@85: 	  ac_cv_sys_large_files=1 ;;
cannam@85: 	esac])
cannam@85:    fi
cannam@85:   ])
cannam@85: