3 dnl By default, many hosts won't let programs access large files;
4 dnl one must use special compiler options to get large-file access to work.
5 dnl For more details about this brain damage please see:
6 dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
8 dnl Written by Paul Eggert <eggert@twinsun.com>.
10 dnl Internal subroutine of AC_SYS_LARGEFILE.
11 dnl AC_SYS_LARGEFILE_FLAGS(FLAGSNAME)
12 AC_DEFUN(AC_SYS_LARGEFILE_FLAGS,
13 [AC_CACHE_CHECK([for $1 value to request large file support],
14 ac_cv_sys_largefile_$1,
15 [ac_cv_sys_largefile_$1=`($GETCONF LFS_$1) 2>/dev/null` || {
16 ac_cv_sys_largefile_$1=no
19 # IRIX 6.2 and later require cc -n32.
21 irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)
23 if test "$GCC" != yes; then
24 ac_cv_sys_largefile_CFLAGS=-n32
27 CC="$CC $ac_cv_sys_largefile_CFLAGS"
28 AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)
33 dnl Internal subroutine of AC_SYS_LARGEFILE.
34 dnl AC_SYS_LARGEFILE_SPACE_APPEND(VAR, VAL)
35 AC_DEFUN(AC_SYS_LARGEFILE_SPACE_APPEND,
45 dnl Internal subroutine of AC_SYS_LARGEFILE.
46 dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
47 AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,
48 [AC_CACHE_CHECK([for $1], $2,
52 for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
57 $2=`expr " $ac_flag" : '[^=]*=\(.*\)'` ;;
62 if test "[$]$2" != no; then
63 AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
66 AC_DEFUN(AC_SYS_LARGEFILE,
67 [AC_REQUIRE([AC_CANONICAL_HOST])
68 AC_ARG_ENABLE(largefile,
69 [ --disable-largefile omit support for large files])
70 if test "$enable_largefile" != no; then
71 AC_CHECK_TOOL(GETCONF, getconf)
72 AC_SYS_LARGEFILE_FLAGS(CFLAGS)
73 AC_SYS_LARGEFILE_FLAGS(LDFLAGS)
74 AC_SYS_LARGEFILE_FLAGS(LIBS)
76 for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
79 -D_FILE_OFFSET_BITS=*) ;;
80 -D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;
81 -D_LARGE_FILES | -D_LARGE_FILES=*) ;;
83 AC_SYS_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;
85 AC_SYS_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;
88 AC_SYS_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")
89 AC_SYS_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")
90 AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,
91 ac_cv_sys_file_offset_bits,
92 [Number of bits in a file offset, on hosts where this is settable.],
94 # HP-UX 10.20 and later
95 hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
96 ac_cv_sys_file_offset_bits=64 ;;
98 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,
99 ac_cv_sys_largefile_source,
100 [Define to make fseeko etc. visible, on some hosts.],
102 # HP-UX 10.20 and later
103 hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
104 ac_cv_sys_largefile_source=1 ;;
106 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES,
107 ac_cv_sys_large_files,
108 [Define for large files, on AIX-style hosts.],
111 aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)
112 ac_cv_sys_large_files=1 ;;