1 GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
2 # Local configure fragment for sysdeps/unix/sysv/linux.
4 define([LIBC_LINUX_VERSION],[3.2.0])dnl
5 if test -n "$sysheaders"; then
7 CPPFLAGS="$CPPFLAGS $SYSINCLUDES"
9 define([libc_cv_linuxVER], [libc_cv_linux]patsubst(LIBC_LINUX_VERSION,[\.]))dnl
10 AC_CACHE_CHECK(installed Linux kernel header files, libc_cv_linuxVER, [dnl
11 AC_TRY_COMPILE([#include <linux/version.h>
12 #if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE < ]dnl
13 patsubst(LIBC_LINUX_VERSION,[^\([^.]*\)\.\([^.]*\)\.\([^.]*\)$],dnl
14 [ (\1 *65536+ \2 *256+ \3) /* \1.\2.\3 */])[
15 # error kernel headers missing or too old
17 [libc_cv_linuxVER='LIBC_LINUX_VERSION or later'],
18 [libc_cv_linuxVER='missing or too old!'])])
19 if test "$libc_cv_linuxVER" != 'LIBC_LINUX_VERSION or later'; then
20 AC_MSG_ERROR([GNU libc requires kernel header files from
21 Linux LIBC_LINUX_VERSION or later to be installed before configuring.
22 The kernel header files are found usually in /usr/include/asm and
23 /usr/include/linux; make sure these directories use files from
24 Linux LIBC_LINUX_VERSION or later. This check uses <linux/version.h>, so
25 make sure that file was built correctly when installing the kernel header
26 files. To use kernel headers not from /usr/include/linux, use the
27 configure option --with-headers.])
30 # If the user gave a minimal version number test whether the available
31 # kernel headers are young enough. Additionally we have minimal
32 # kernel versions for some architectures. If a previous configure fragment
33 # set arch_minimum_kernel already, let that override our defaults here.
34 # Note that we presume such a fragment has set libc_cv_gcc_unwind_find_fde
36 test -n "$arch_minimum_kernel" || arch_minimum_kernel=3.2.0
37 if test -n "$minimum_kernel"; then
39 user_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
40 arch_version=$((`echo "$arch_minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
42 if test $user_version -lt $arch_version; then
43 AC_MSG_WARN([minimum kernel version reset to $arch_minimum_kernel])
44 minimum_kernel=$arch_minimum_kernel
47 minimum_kernel=$arch_minimum_kernel
50 AC_MSG_CHECKING(for kernel header at least $minimum_kernel)
52 decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
53 abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`;
55 AC_TRY_COMPILE([#include <linux/version.h>
56 #if LINUX_VERSION_CODE < $decnum
57 # error kernel headers too old
58 #endif], [], [libc_minimum_kernel=ok], [libc_minimum_kernel='too old!'])
59 AC_MSG_RESULT($libc_minimum_kernel)
60 if test "$libc_minimum_kernel" = ok; then
61 AC_DEFINE_UNQUOTED(__LINUX_KERNEL_VERSION, $decnum)
62 AC_DEFINE_UNQUOTED(__ABI_TAG_VERSION, $abinum)
64 AC_MSG_ERROR([*** The available kernel headers are older than the requested
65 *** compatible kernel version])
68 if test -n "$sysheaders"; then
69 CPPFLAGS=$OLD_CPPFLAGS
72 if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/" -o "$prefix" = "NONE"; then
73 if test $enable_sanity = yes; then
75 *** On GNU/Linux systems the GNU C Library should not be installed into
76 *** /usr/local since this might make your system totally unusable.
77 *** We strongly advise to use a different prefix. For details read the FAQ.
78 *** If you really mean to do this, run configure again using the extra
79 *** parameter \`--disable-sanity-checks'."
83 *** WARNING: Do you really want to install the GNU C Library into /usr/local?
84 *** This might make your system totally unusable, for details read the FAQ."
89 # One Linux we use ldconfig.
92 if test $host = $build; then
93 # If $prefix/include/{net,scsi} are symlinks, make install will
94 # clobber what they're linked to (probably a kernel tree).
95 # test -L ought to work on all Linux boxes.
96 if test "x$prefix" != xNONE; then
99 ac_prefix=$ac_default_prefix
101 AC_MSG_CHECKING([for symlinks in ${ac_prefix}/include])
103 if test -L ${ac_prefix}/include/net; then
104 ac_message="$ac_message
105 ${ac_prefix}/include/net is a symlink"
107 if test -L ${ac_prefix}/include/scsi; then
108 ac_message="$ac_message
109 ${ac_prefix}/include/scsi is a symlink"
111 if test -n "$ac_message"; then
112 AC_MSG_ERROR([$ac_message
113 \`make install' will destroy the target of the link(s).
114 Delete the links and re-run configure, or better still, move the entire
115 ${ac_prefix}/include directory out of the way.])
121 # We have inlined syscalls.
122 AC_DEFINE(HAVE_INLINED_SYSCALLS)