1dnl By default, many hosts won't let programs access large files;
2dnl one must use special compiler options to get large-file access to work.
3dnl For more details about this brain damage please see:
4dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
5
6dnl Written by Paul Eggert <eggert@twinsun.com>.
7
8dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
9dnl AC_SYS_EXTRA_LARGEFILE_FLAGS(FLAGSNAME)
10AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_FLAGS],
11  [AC_CACHE_CHECK([for $1 value to request large file support],
12     ac_cv_sys_largefile_$1,
13     [ac_cv_sys_largefile_$1=`($GETCONF LFS_$1) 2>/dev/null` || {
14	ac_cv_sys_largefile_$1=no
15	ifelse($1, CFLAGS,
16	  [case "$host_os" in
17	   # IRIX 6.2 and later require cc -n32.
18changequote(, )dnl
19	   irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)
20changequote([, ])dnl
21	     if test "$GCC" != yes; then
22	       ac_cv_sys_largefile_CFLAGS=-n32
23	     fi
24	     ac_save_CC="$CC"
25	     CC="$CC $ac_cv_sys_largefile_CFLAGS"
26	     AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)
27	     CC="$ac_save_CC"
28	   esac])
29      }])])
30
31dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
32dnl AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(VAR, VAL)
33AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND],
34  [case $2 in
35   no) ;;
36   ?*)
37     case "[$]$1" in
38     '') $1=$2 ;;
39     *) $1=[$]$1' '$2 ;;
40     esac ;;
41   esac])
42
43dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
44dnl AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
45AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE],
46  [AC_CACHE_CHECK([for $1], $2,
47     [$2=no
48changequote(, )dnl
49      $4
50      for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
51	case "$ac_flag" in
52	-D$1)
53	  $2=1 ;;
54	-D$1=*)
55	  $2=`expr " $ac_flag" : '[^=]*=\(.*\)'` ;;
56	esac
57      done
58changequote([, ])dnl
59      ])
60   if test "[$]$2" != no; then
61     AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
62   fi])
63
64AC_DEFUN([AC_SYS_EXTRA_LARGEFILE],
65  [AC_REQUIRE([AC_CANONICAL_HOST])
66   AC_ARG_ENABLE(largefile,
67     [  --disable-largefile     omit support for large files])
68   if test "$enable_largefile" != no; then
69     AC_CHECK_TOOL(GETCONF, getconf)
70     AC_SYS_EXTRA_LARGEFILE_FLAGS(CFLAGS)
71     AC_SYS_EXTRA_LARGEFILE_FLAGS(LDFLAGS)
72     AC_SYS_EXTRA_LARGEFILE_FLAGS(LIBS)
73
74     for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
75       case "$ac_flag" in
76       no) ;;
77       -D_FILE_OFFSET_BITS=*) ;;
78       -D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;
79       -D_LARGE_FILES | -D_LARGE_FILES=*) ;;
80       -D?* | -I?*)
81	 AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;
82       *)
83	 AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;
84       esac
85     done
86     AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")
87     AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")
88     AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,
89       ac_cv_sys_file_offset_bits,
90       [Number of bits in a file offset, on hosts where this is settable.])
91       [case "$host_os" in
92	# HP-UX 10.20 and later
93	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
94	  ac_cv_sys_file_offset_bits=64 ;;
95	esac]
96     AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,
97       ac_cv_sys_largefile_source,
98       [Define to make fseeko etc. visible, on some hosts.],
99       [case "$host_os" in
100	# HP-UX 10.20 and later
101	hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
102	  ac_cv_sys_largefile_source=1 ;;
103	esac])
104     AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(_LARGE_FILES,
105       ac_cv_sys_large_files,
106       [Define for large files, on AIX-style hosts.],
107       [case "$host_os" in
108	# AIX 4.2 and later
109	aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)
110	  ac_cv_sys_large_files=1 ;;
111	esac])
112   fi
113  ])
114
115