about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/configure
blob: 64f2ce063822a0dd1fcfe875ccc544caf5878efa (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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
 # Local configure fragment for sysdeps/unix/sysv/linux.

# On Linux, the default is to use libio instead of stdio.
test $stdio = default && stdio=libio

# Don't bother trying to generate any glue code to be compatible with the
# existing system library, because we are the only system library.
inhibit_glue=yes

if test -n "$sysheaders"; then
  OLD_CFLAGS=$CFLAGS
  CFLAGS="$CFLAGS $SYSINCLUDES"
fi
echo $ac_n "checking installed Linux kernel header files""... $ac_c" 1>&6
echo "configure:16: checking installed Linux kernel header files" >&5
if eval "test \"\${libc_cv_linux2010+set}\" = set"; then
  echo $ac_n "(cached) $ac_c" 1>&6
else
  cat > conftest.$ac_ext <<EOF
#line 21 "configure"
#include "confdefs.h"
#include <linux/version.h>
#if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE <  (2 *65536+ 0 *256+ 10) /* 2.0.10 */
eat flaming death
#endif
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "eat flaming death" >/dev/null 2>&1; then
  rm -rf conftest*
  libc_cv_linux2010='TOO OLD!'
else
  rm -rf conftest*
  libc_cv_linux2010='2.0.10 or later'
fi
rm -f conftest*

fi

echo "$ac_t""$libc_cv_linux2010" 1>&6
if test "$libc_cv_linux2010" != '2.0.10 or later'; then
  { echo "configure: error: GNU libc requires kernel header files from
Linux 2.0.10 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 2.0.10 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." 1>&2; exit 1; }
fi

# If the user gave a minimal version number test whether the available
# kernel headers are young enough.
if test -n "$minimum_kernel"; then
  echo $ac_n "checking for kernel header at least $minimum_kernel""... $ac_c" 1>&6
echo "configure:56: checking for kernel header at least $minimum_kernel" >&5
  decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
  cat > conftest.$ac_ext <<EOF
#line 59 "configure"
#include "confdefs.h"
#include <linux/version.h>
#if LINUX_VERSION_CODE < $decnum
eat flaming death
#endif
EOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
  egrep "eat flaming death" >/dev/null 2>&1; then
  rm -rf conftest*
  libc_minimum_kernel='too old!'
else
  rm -rf conftest*
  libc_minimum_kernel=ok
fi
rm -f conftest*

  echo "$ac_t""$libc_minimum_kernel" 1>&6
  if test "$libc_minimum_kernel" = ok; then
    cat >> confdefs.h <<EOF
#define __LINUX_KERNEL_VERSION $decnum
EOF

  else
    { echo "configure: error: *** The available kernel headers are older than the requested
*** compatible kernel version" 1>&2; exit 1; }
  fi
fi

if test -n "$sysheaders"; then
  CFLAGS=$OLD_CFLAGS
fi
# The Linux filesystem standard prescribes where to place "essential"
# files.  I.e., when the installation prefix is "/usr" we have to place
# shared library objects and the configuration files on the root partition
# in /lib and /etc.
if test "$prefix" = "/usr"; then
  # 64bit libraries on sparc go to /lib64 and not /lib
  if test "$machine" = "sparc/sparc64"; then
    libc_cv_slibdir="/lib64"
    if test "$libdir" = '${exec_prefix}/lib'; then
      libdir='${exec_prefix}/lib64';
    fi
  else
    libc_cv_slibdir="/lib"
  fi
  libc_cv_sysconfdir="/etc"
  libc_cv_rootsbindir="/sbin"
fi

# Under Linux the LinuxThreads and crypt add-on should be available.
case $add_ons in
  # Both are available.  Good.
  *linuxthreads*crypt* | *crypt*linuxthreads*)
    message=
    ;;
  *linuxthreads*)
    message="\
*** WARNING:
*** Are you sure you do not want to use the \`crypt' add-on?"
    ;;
  *crypt*)
    message="\
*** WARNING:
*** Are you sure you do not want to use the \`linuxthread' add-on?"
    ;;
  *)
    message="\
*** WARNING: Are you sure you do not want to use the \`linuxthreads'
*** and \`crypt' add-ons?"
    ;;
esac

if test "$message"; then
  if test $enable_sanity = yes; then
    echo "\
*** You should not compile the GNU libc without the \`linuxthreads' and
*** \`crypt' add-on.  Not using them risks to be incompatible with the
*** libraries of other systems.  Consider getting the add-ons and restart
*** the configuration.
*** If you really mean to avoid those add-ons run configure again, now
*** using the extra parameter \`--disable-sanity-checks'."
    exit 1
  else
    echo "$message"
  fi
fi

# Check whether `ldconfig' sources are available.  This will go away as soon
# as ldconfig is available in GNU libc.
if test -f $srcdir/elf/ldconfig.c; then
  has_ldconfig=yes
fi

# We need some extensions to the `ldd' script.

case "$machine" in
  i[3456]86* | m68*)
    ldd_rewrite_script=../sysdeps/unix/sysv/linux/ldd-rewrite.sed
    ;;
  sparc/sparc32)
    ldd_rewrite_script=../sysdeps/unix/sysv/linux/sparc/ldd-rewrite.sed
    ;;
  *)
    ;;
esac


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
  echo $ac_n "checking for symlinks in ${ac_prefix}/include""... $ac_c" 1>&6
echo "configure:177: checking for symlinks in ${ac_prefix}/include" >&5
  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
    { echo "configure: 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
${ac_prefix}/include directory out of the way." 1>&2; exit 1; }
  else
    echo "$ac_t""ok" 1>&6
  fi
fi