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_$1=no
19 # HP-UX 10.20 requires -D__STDC_EXT__ with gcc 2.95.1.
21 hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
23 if test "$GCC" = yes; then
24 ac_cv_sys_largefile_CFLAGS=-D__STDC_EXT__
27 # IRIX 6.2 and later require cc -n32.
29 irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)
31 if test "$GCC" != yes; then
32 ac_cv_sys_largefile_CFLAGS=-n32
35 if test "$ac_cv_sys_largefile_CFLAGS" != no; then
37 CC="$CC $ac_cv_sys_largefile_CFLAGS"
38 AC_TRY_LINK(, , , ac_cv_sys_largefile_CFLAGS=no)
43 dnl Internal subroutine of AC_SYS_LARGEFILE.
44 dnl AC_SYS_LARGEFILE_SPACE_APPEND(VAR, VAL)
45 AC_DEFUN(AC_SYS_LARGEFILE_SPACE_APPEND,
55 dnl Internal subroutine of AC_SYS_LARGEFILE.
56 dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
57 AC_DEFUN(AC_SYS_LARGEFILE_MACRO_VALUE,
58 [AC_CACHE_CHECK([for $1], $2,
62 for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
67 $2=`expr " $ac_flag" : '[^=]*=\(.*\)'` ;;
72 if test "[$]$2" != no; then
73 AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
76 AC_DEFUN(AC_SYS_LARGEFILE,
77 [AC_REQUIRE([AC_CANONICAL_HOST])
78 AC_ARG_ENABLE(largefile,
79 [ --disable-largefile omit support for large files])
80 if test "$enable_largefile" != no; then
81 AC_CHECK_TOOL(GETCONF, getconf)
82 AC_SYS_LARGEFILE_FLAGS(CFLAGS)
83 AC_SYS_LARGEFILE_FLAGS(LDFLAGS)
84 AC_SYS_LARGEFILE_FLAGS(LIBS)
86 for ac_flag in $ac_cv_sys_largefile_CFLAGS no; do
89 -D_FILE_OFFSET_BITS=*) ;;
90 -D_LARGEFILE_SOURCE | -D_LARGEFILE_SOURCE=*) ;;
91 -D_LARGE_FILES | -D_LARGE_FILES=*) ;;
93 AC_SYS_LARGEFILE_SPACE_APPEND(CPPFLAGS, "$ac_flag") ;;
95 AC_SYS_LARGEFILE_SPACE_APPEND(CFLAGS, "$ac_flag") ;;
98 AC_SYS_LARGEFILE_SPACE_APPEND(LDFLAGS, "$ac_cv_sys_largefile_LDFLAGS")
99 AC_SYS_LARGEFILE_SPACE_APPEND(LIBS, "$ac_cv_sys_largefile_LIBS")
100 AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS,
101 ac_cv_sys_file_offset_bits,
102 [Number of bits in a file offset, on hosts where this is settable.],
104 # HP-UX 10.20 and later
105 hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
106 ac_cv_sys_file_offset_bits=64 ;;
108 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE,
109 ac_cv_sys_largefile_source,
110 [Define to make fseeko etc. visible, on some hosts.],
112 # HP-UX 10.20 and later
113 hpux10.[2-9][0-9]* | hpux1[1-9]* | hpux[2-9][0-9]*)
114 ac_cv_sys_largefile_source=1 ;;
116 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES,
117 ac_cv_sys_large_files,
118 [Define for large files, on AIX-style hosts.],
121 aix4.[2-9]* | aix4.1[0-9]* | aix[5-9].* | aix[1-9][0-9]*)
122 ac_cv_sys_large_files=1 ;;