1 dnl AC_VALIDATE_CACHE_SYSTEM_TYPE[(cmd)]
2 dnl if the cache file is inconsistent with the current host,
3 dnl target and build system types, execute CMD or print a default
5 AC_DEFUN(AC_VALIDATE_CACHE_SYSTEM_TYPE, [
6 AC_REQUIRE([AC_CANONICAL_SYSTEM])
7 AC_MSG_CHECKING([config.cache system type])
8 if { test x"${ac_cv_host_system_type+set}" = x"set" &&
9 test x"$ac_cv_host_system_type" != x"$host"; } ||
10 { test x"${ac_cv_build_system_type+set}" = x"set" &&
11 test x"$ac_cv_build_system_type" != x"$build"; } ||
12 { test x"${ac_cv_target_system_type+set}" = x"set" &&
13 test x"$ac_cv_target_system_type" != x"$target"; }; then
14 AC_MSG_RESULT([different])
16 [AC_MSG_ERROR(["you must remove config.cache and restart configure"])])
20 ac_cv_host_system_type="$host"
21 ac_cv_build_system_type="$build"
22 ac_cv_target_system_type="$target"
27 dnl By default, many hosts won't let programs access large files;
28 dnl one must use special compiler options to get large-file access to work.
29 dnl For more details about this brain damage please see:
30 dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
32 dnl Written by Paul Eggert <eggert@twinsun.com>.
34 dnl Internal subroutine of AC_SYS_LARGEFILE.
35 dnl AC_SYS_LARGEFILE_TEST_INCLUDES
36 AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,
37 [[#include <sys/types.h>
38 int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1];
41 dnl Internal subroutine of AC_SYS_LARGEFILE.
42 dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, FUNCTION-BODY)
43 AC_DEFUN([AC_SYS_LARGEFILE_MACRO_VALUE],
44 [AC_CACHE_CHECK([for $1 value needed for large files], $3,
46 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES
51 [AC_TRY_COMPILE([#define $1 $2]
52 AC_SYS_LARGEFILE_TEST_INCLUDES
57 if test "[$]$3" != no; then
58 AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
61 AC_DEFUN([AC_SYS_LARGEFILE],
62 [AC_ARG_ENABLE(largefile,
63 [ --disable-largefile omit support for large files])
64 if test "$enable_largefile" != no; then
66 AC_CACHE_CHECK([for special C compiler options needed for large files],
67 ac_cv_sys_largefile_CC,
68 [ac_cv_sys_largefile_CC=no
69 if test "$GCC" != yes; then
70 # IRIX 6.2 and later do not support large files by default,
71 # so use the C compiler's -n32 option if that helps.
72 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,
75 AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,
76 ac_cv_sys_largefile_CC=' -n32')
79 if test "$ac_cv_sys_largefile_CC" != no; then
80 CC="$CC$ac_cv_sys_largefile_CC"
83 AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
84 ac_cv_sys_file_offset_bits,
85 [Number of bits in a file offset, on hosts where this is settable.])
86 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
87 ac_cv_sys_largefile_source,
88 [Define to make ftello visible on some hosts (e.g. HP-UX 10.20).],
89 [#include <stdio.h>], [return !ftello;])
90 AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
91 ac_cv_sys_large_files,
92 [Define for large files, on AIX-style hosts.])
93 AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500,
94 ac_cv_sys_xopen_source,
95 [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).],
96 [#include <stdio.h>], [return !ftello;])