about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/configure.ac
blob: f207c26c77a780e3917a61489c70624a52512f5d (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
# Local configure fragment for sysdeps/unix/sysv/linux.

define([LIBC_LINUX_VERSION],[2.6.32])dnl
if test -n "$sysheaders"; then
  OLD_CPPFLAGS=$CPPFLAGS
  CPPFLAGS="$CPPFLAGS $SYSINCLUDES"
fi
define([libc_cv_linuxVER], [libc_cv_linux]patsubst(LIBC_LINUX_VERSION,[\.]))dnl
AC_CACHE_CHECK(installed Linux kernel header files, libc_cv_linuxVER, [dnl
AC_TRY_COMPILE([#include <linux/version.h>
#if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE < ]dnl
patsubst(LIBC_LINUX_VERSION,[^\([^.]*\)\.\([^.]*\)\.\([^.]*\)$],dnl
[ (\1 *65536+ \2 *256+ \3) /* \1.\2.\3 */])[
# error kernel headers missing or too old
#endif], [],
	       [libc_cv_linuxVER='LIBC_LINUX_VERSION or later'],
	       [libc_cv_linuxVER='missing or too old!'])])
if test "$libc_cv_linuxVER" != 'LIBC_LINUX_VERSION or later'; then
  AC_MSG_ERROR([GNU libc requires kernel header files from
Linux LIBC_LINUX_VERSION or later to be installed before configuring.
The kernel header files are found usually in /usr/include/asm and
/usr/include/linux; make sure these directories use files from
Linux LIBC_LINUX_VERSION or later.  This check uses <linux/version.h>, so
make sure that file was built correctly when installing the kernel header
files.  To use kernel headers not from /usr/include/linux, use the
configure option --with-headers.])
fi

# If the user gave a minimal version number test whether the available
# kernel headers are young enough.  Additionally we have minimal
# kernel versions for some architectures.  If a previous configure fragment
# set arch_minimum_kernel already, let that override our defaults here.
# Note that we presume such a fragment has set libc_cv_gcc_unwind_find_fde
# if appropriate too.
test -n "$arch_minimum_kernel" || arch_minimum_kernel=2.6.32
if test -n "$minimum_kernel"; then
  changequote(,)
  user_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
  arch_version=$((`echo "$arch_minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
  changequote([,])
  if test $user_version -lt $arch_version; then
    AC_MSG_WARN([minimum kernel version reset to $arch_minimum_kernel])
    minimum_kernel=$arch_minimum_kernel
  fi
else
  minimum_kernel=$arch_minimum_kernel
fi

AC_MSG_CHECKING(for kernel header at least $minimum_kernel)
changequote(,)dnl
decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`;
changequote([,])dnl
AC_TRY_COMPILE([#include <linux/version.h>
#if LINUX_VERSION_CODE < $decnum
# error kernel headers too old
#endif], [], [libc_minimum_kernel=ok], [libc_minimum_kernel='too old!'])
AC_MSG_RESULT($libc_minimum_kernel)
if test "$libc_minimum_kernel" = ok; then
  AC_DEFINE_UNQUOTED(__LINUX_KERNEL_VERSION, $decnum)
  AC_DEFINE_UNQUOTED(__ABI_TAG_VERSION, $abinum)
else
  AC_MSG_ERROR([*** The available kernel headers are older than the requested
*** compatible kernel version])
fi

# Until we start requiring 2.6.37+ headers, we need to check for the
# availability of linux/fanotify.h for testing purposes.
AC_CHECK_HEADER(linux/fanotify.h,
  [AC_DEFINE(HAVE_LINUX_FANOTIFY_H)], ,
  [/* No default includes.  */])

# The result of the above test for the use of the FDE code is invalid if
# the user overrides the decision about the minimum ABI.
if test "$oldest_abi" != default && test "2.2.4" \< "$oldest_abi"; then
  libc_cv_gcc_unwind_find_fde=no
fi

if test -n "$sysheaders"; then
  CPPFLAGS=$OLD_CPPFLAGS
fi

if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/" -o "$prefix" = "NONE"; then
  if test $enable_sanity = yes; then
    echo "\
*** On GNU/Linux systems the GNU C Library should not be installed into
*** /usr/local since this might make your system totally unusable.
*** We strongly advise to use a different prefix.  For details read the FAQ.
*** If you really mean to do this, run configure again using the extra
*** parameter \`--disable-sanity-checks'."
    exit 1
  else
    echo "\
*** WARNING: Do you really want to install the GNU C Library into /usr/local?
*** This might make your system totally unusable, for details read the FAQ."
  fi
fi


# One Linux we use ldconfig.
use_ldconfig=yes

if test $host = $build; then
  # If $prefix/include/{net,scsi} are symlinks, make install will
  # clobber what they're linked to (probably a kernel tree).
  # test -L ought to work on all Linux boxes.
  if test "x$prefix" != xNONE; then
    ac_prefix=$prefix
  else
    ac_prefix=$ac_default_prefix
  fi
  AC_MSG_CHECKING([for symlinks in ${ac_prefix}/include])
  ac_message=
  if test -L ${ac_prefix}/include/net; then
    ac_message="$ac_message
   ${ac_prefix}/include/net is a symlink"
  fi
  if test -L ${ac_prefix}/include/scsi; then
    ac_message="$ac_message
   ${ac_prefix}/include/scsi is a symlink"
  fi
  if test -n "$ac_message"; then
    AC_MSG_ERROR([$ac_message
\`make install' will destroy the target of the link(s).
Delete the links and re-run configure, or better still, move the entire
${ac_prefix}/include directory out of the way.])
  else
    AC_MSG_RESULT(ok)
  fi
fi

# We have inlined syscalls.
AC_DEFINE(HAVE_INLINED_SYSCALLS)