1 # Local configure fragment for sysdeps/unix/sysv/linux.
3 # On Linux, the default is to use libio instead of stdio.
4 test $stdio = default && stdio=libio
6 # Don't bother trying to generate any glue code to be compatible with the
7 # existing system library, because we are the only system library.
10 if test -n "$sysheaders"; then
11 OLD_CPPFLAGS=$CPPFLAGS
12 CPPFLAGS="$CPPFLAGS $SYSINCLUDES"
14 echo $ac_n "checking installed Linux kernel header files""... $ac_c" 1>&6
15 echo "configure:16: checking installed Linux kernel header files" >&5
16 if eval "test \"`echo '$''{'libc_cv_linux2010'+set}'`\" = set"; then
17 echo $ac_n "(cached) $ac_c" 1>&6
19 cat > conftest.$ac_ext <<EOF
22 #include <linux/version.h>
23 #if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE < (2 *65536+ 0 *256+ 10) /* 2.0.10 */
27 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
28 egrep "eat flaming death" >/dev/null 2>&1; then
30 libc_cv_linux2010='TOO OLD!'
33 libc_cv_linux2010='2.0.10 or later'
39 echo "$ac_t""$libc_cv_linux2010" 1>&6
40 if test "$libc_cv_linux2010" != '2.0.10 or later'; then
41 { echo "configure: error: GNU libc requires kernel header files from
42 Linux 2.0.10 or later to be installed before configuring.
43 The kernel header files are found usually in /usr/include/asm and
44 /usr/include/linux; make sure these directories use files from
45 Linux 2.0.10 or later. This check uses <linux/version.h>, so
46 make sure that file was built correctly when installing the kernel header
47 files. To use kernel headers not from /usr/include/linux, use the
48 configure option --with-headers." 1>&2; exit 1; }
51 # If the user gave a minimal version number test whether the available
52 # kernel headers are young enough. Additionally we have minimal
53 # kernel versions for some architectures.
56 arch_minimum_kernel=2.1.100
57 libc_cv_gcc_unwind_find_fde=yes
60 libc_cv_gcc_unwind_find_fde=yes
61 arch_minimum_kernel=2.0.10
64 arch_minimum_kernel=2.4.0
67 arch_minimum_kernel=2.3.99
70 arch_minimum_kernel=2.0.10
71 libc_cv_gcc_unwind_find_fde=yes
74 arch_minimum_kernel=2.2.15
75 libc_cv_gcc_unwind_find_fde=yes
78 libc_cv_gcc_unwind_find_fde=yes
79 arch_minimum_kernel=2.0.10
82 libc_cv_gcc_unwind_find_fde=yes
83 arch_minimum_kernel=2.2.10
86 libc_cv_gcc_unwind_find_fde=yes
87 arch_minimum_kernel=2.4.0
90 arch_minimum_kernel=2.3.99
91 libc_cv_gcc_unwind_find_fde=yes
94 libc_cv_gcc_unwind_find_fde=yes
95 arch_minimum_kernel=2.0.10
98 arch_minimum_kernel=2.4.0
101 arch_minimum_kernel=2.0.10
104 if test -n "$minimum_kernel"; then
106 user_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
107 arch_version=$((`echo "$arch_minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
109 if test $user_version -lt $arch_version; then
110 echo "configure: warning: minimum kernel version reset to $arch_minimum_kernel" 1>&2
111 minimum_kernel=$arch_minimum_kernel
114 if test $arch_minimum_kernel != '2.0.10'; then
115 minimum_kernel=$arch_minimum_kernel
119 if test -n "$minimum_kernel"; then
120 echo $ac_n "checking for kernel header at least $minimum_kernel""... $ac_c" 1>&6
121 echo "configure:122: checking for kernel header at least $minimum_kernel" >&5
122 decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
123 abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`;
124 cat > conftest.$ac_ext <<EOF
125 #line 126 "configure"
126 #include "confdefs.h"
127 #include <linux/version.h>
128 #if LINUX_VERSION_CODE < $decnum
132 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
133 egrep "eat flaming death" >/dev/null 2>&1; then
135 libc_minimum_kernel='too old!'
138 libc_minimum_kernel=ok
142 echo "$ac_t""$libc_minimum_kernel" 1>&6
143 if test "$libc_minimum_kernel" = ok; then
144 cat >> confdefs.h <<EOF
145 #define __LINUX_KERNEL_VERSION $decnum
148 cat >> confdefs.h <<EOF
149 #define __ABI_TAG_VERSION $abinum
153 { echo "configure: error: *** The available kernel headers are older than the requested
154 *** compatible kernel version" 1>&2; exit 1; }
158 # The result of the above test for the use of the FDE code is invalid if
159 # the user overrides the decision about the minimum ABI.
160 if test "$oldest_abi" != default && test "2.2.4" \< "$oldest_abi"; then
161 libc_cv_gcc_unwind_find_fde=no
164 if test -n "$sysheaders"; then
165 CPPFLAGS=$OLD_CPPFLAGS
167 # The Linux filesystem standard prescribes where to place "essential"
168 # files. I.e., when the installation prefix is "/usr" we have to place
169 # shared library objects and the configuration files on the root partition
171 if test "$prefix" = "/usr" -o "$prefix" = "/usr/"; then
172 # 64bit libraries on sparc go to /lib64 and not /lib
173 if test "$machine" = "sparc/sparc64" -o "$machine" = "x86_64"; then
174 libc_cv_slibdir="/lib64"
175 if test "$libdir" = '${exec_prefix}/lib'; then
176 libdir='${exec_prefix}/lib64';
177 # Locale data can be shared between 32bit and 64bit libraries
178 libc_cv_localedir='${exec_prefix}/lib/locale'
181 libc_cv_slibdir="/lib"
183 # Allow the user to override the path with --sysconfdir
184 if test $sysconfdir = '${prefix}/etc'; then
185 libc_cv_sysconfdir=/etc
187 libc_cv_sysconfdir=$sysconfdir
189 libc_cv_rootsbindir="/sbin"
192 # Under Linux the LinuxThreads add-on should be available.
194 # It is available. Good.
196 linuxthreads_missing=
199 linuxthreads_missing=yes
203 if test "$linuxthreads_missing"; then
204 if test $enable_sanity = yes; then
206 *** On GNU/Linux systems it is normal to compile GNU libc with the
207 *** \`linuxthreads' add-on. Without that, the library will be
208 *** incompatible with normal GNU/Linux systems.
209 *** If you really mean to not use this add-on, run configure again
210 *** using the extra parameter \`--disable-sanity-checks'."
214 *** WARNING: Are you sure you do not want to use the \`linuxthreads'
219 # One Linux we use ldconfig.
222 # We need some extensions to the `ldd' script.
226 ldd_rewrite_script=../sysdeps/unix/sysv/linux/ldd-rewrite.sed
229 ldd_rewrite_script=../sysdeps/unix/sysv/linux/ia64/ldd-rewrite.sed
232 ldd_rewrite_script=../sysdeps/unix/sysv/linux/s390/ldd-rewrite.sed
235 ldd_rewrite_script=../sysdeps/unix/sysv/linux/sparc/ldd-rewrite.sed
238 ldd_rewrite_script=../sysdeps/unix/sysv/linux/x86_64/ldd-rewrite.sed
245 if test $host = $build; then
246 # If $prefix/include/{net,scsi} are symlinks, make install will
247 # clobber what they're linked to (probably a kernel tree).
248 # test -L ought to work on all Linux boxes.
249 if test "x$prefix" != xNONE; then
252 ac_prefix=$ac_default_prefix
254 echo $ac_n "checking for symlinks in ${ac_prefix}/include""... $ac_c" 1>&6
255 echo "configure:256: checking for symlinks in ${ac_prefix}/include" >&5
257 if test -L ${ac_prefix}/include/net; then
258 ac_message="$ac_message
259 ${ac_prefix}/include/net is a symlink"
261 if test -L ${ac_prefix}/include/scsi; then
262 ac_message="$ac_message
263 ${ac_prefix}/include/scsi is a symlink"
265 if test -n "$ac_message"; then
266 { echo "configure: error: $ac_message
267 \`make install' will destroy the target of the link(s).
268 Delete the links and re-run configure, or better still, move the entire
269 ${ac_prefix}/include directory out of the way." 1>&2; exit 1; }
271 echo "$ac_t""ok" 1>&6