root/liboggz/trunk/m4/ac-sys-extra-largefile.m4

Revision 2106, 3.6 kB (checked in by conrad, 3 years ago)

add autoconfiguration for large (>2GB) file support
oggz_off_t (as used in oggz_read.c and oggz_seek.c) is now automatically
generated; this will need to be defined statically in config.h for
win32/ and symbian/

Line 
1 dnl By default, many hosts won't let programs access large files;
2 dnl one must use special compiler options to get large-file access to work.
3 dnl For more details about this brain damage please see:
4 dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
5
6 dnl Written by Paul Eggert <eggert@twinsun.com>.
7
8 dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
9 dnl AC_SYS_EXTRA_LARGEFILE_FLAGS(FLAGSNAME)
10 AC_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.
18 changequote(, )dnl
19            irix6.[2-9]* | irix6.1[0-9]* | irix[7-9].* | irix[1-9][0-9]*)
20 changequote([, ])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
31 dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
32 dnl AC_SYS_EXTRA_LARGEFILE_SPACE_APPEND(VAR, VAL)
33 AC_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
43 dnl Internal subroutine of AC_SYS_EXTRA_LARGEFILE.
44 dnl AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE(C-MACRO, CACHE-VAR, COMMENT, CODE-TO-SET-DEFAULT)
45 AC_DEFUN([AC_SYS_EXTRA_LARGEFILE_MACRO_VALUE],
46   [AC_CACHE_CHECK([for $1], $2,
47      [$2=no
48 changequote(, )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
58 changequote([, ])dnl
59       ])
60    if test "[$]$2" != no; then
61      AC_DEFINE_UNQUOTED([$1], [$]$2, [$3])
62    fi])
63
64 AC_DEFUN([AC_SYS_EXTRA_LARGEFILE],
65   [AC_REQUIRE([AC_CANONICAL_HOST])
66    AC_ARG_ENABLE(largefile,
67      [  --disable-largefile     omit support for large files])
68    if test "$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
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