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 "$libc_cv_linux2010" != '2.0.10 or later'; then
41 { echo "configure: error: GNU libc requires kernel header files from
42 Linux 2.0.10 or later to be installed before configuring.
43 The kernel header files are found usually in /usr/include/asm and
44 /usr/include/linux; make sure these directories use files from
45 Linux 2.0.10 or later. This check uses <linux/version.h>, so
46 make sure that file was built correctly when installing the kernel header
47 files. To use kernel headers not from /usr/include/linux, use the
48 configure option --with-headers." 1>&2; exit 1; }
51 # If the user gave a minimal version number test whether the available
52 # kernel headers are young enough. Additionally we have minimal
53 # kernel versions for some architectures.
56 arch_minimum_kernel=2.1.100
57 libc_cv_gcc_unwind_find_fde=yes
60 libc_cv_gcc_unwind_find_fde=yes
61 arch_minimum_kernel=2.0.10
64 arch_minimum_kernel=2.4.0
67 arch_minimum_kernel=2.3.99
70 arch_minimum_kernel=2.2.15
71 libc_cv_gcc_unwind_find_fde=yes
74 libc_cv_gcc_unwind_find_fde=yes
75 arch_minimum_kernel=2.0.10
78 arch_minimum_kernel=2.3.99
79 libc_cv_gcc_unwind_find_fde=yes
82 libc_cv_gcc_unwind_find_fde=yes
83 arch_minimum_kernel=2.0.10
86 arch_minimum_kernel=2.4.0
89 arch_minimum_kernel=2.0.10
92 if test -n "$minimum_kernel"; then
94 user_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
95 arch_version=$((`echo "$arch_minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
97 if test $user_version -lt $arch_version; then
98 echo "configure: warning: minimum kernel version reset to $arch_minimum_kernel" 1>&2
99 minimum_kernel=$arch_minimum_kernel
102 if test $arch_minimum_kernel != '2.0.10'; then
103 minimum_kernel=$arch_minimum_kernel
107 if test -n "$minimum_kernel"; then
108 echo $ac_n "checking for kernel header at least $minimum_kernel""... $ac_c" 1>&6
109 echo "configure:110: checking for kernel header at least $minimum_kernel" >&5
110 decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
111 abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`;
112 cat > conftest.$ac_ext <<EOF
113 #line 114 "configure"
114 #include "confdefs.h"
115 #include <linux/version.h>
116 #if LINUX_VERSION_CODE < $decnum
120 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
121 egrep "eat flaming death" >/dev/null 2>&1; then
123 libc_minimum_kernel='too old!'
126 libc_minimum_kernel=ok
130 echo "$ac_t""$libc_minimum_kernel" 1>&6
131 if test "$libc_minimum_kernel" = ok; then
132 cat >> confdefs.h <<EOF
133 #define __LINUX_KERNEL_VERSION $decnum
136 cat >> confdefs.h <<EOF
137 #define __ABI_TAG_VERSION $abinum
141 { echo "configure: error: *** The available kernel headers are older than the requested
142 *** compatible kernel version" 1>&2; exit 1; }
146 # The result of the above test for the use of the FDE code is invalid if
147 # the user overrides the decision about the minimum ABI.
148 if test "$oldest_abi" != default && test "2.2.4" \< "$oldest_abi"; then
149 libc_cv_gcc_unwind_find_fde=no
152 if test -n "$sysheaders"; then
153 CPPFLAGS=$OLD_CPPFLAGS
155 # The Linux filesystem standard prescribes where to place "essential"
156 # files. I.e., when the installation prefix is "/usr" we have to place
157 # shared library objects and the configuration files on the root partition
159 if test "$prefix" = "/usr" -o "$prefix" = "/usr/"; then
160 # 64bit libraries on sparc go to /lib64 and not /lib
161 if test "$machine" = "sparc/sparc64" -o "$machine" = "x86_64"; then
162 libc_cv_slibdir="/lib64"
163 if test "$libdir" = '${exec_prefix}/lib'; then
164 libdir='${exec_prefix}/lib64';
165 # Locale data can be shared between 32bit and 64bit libraries
166 libc_cv_localedir='${exec_prefix}/lib/locale'
169 libc_cv_slibdir="/lib"
171 # Allow the user to override the path with --sysconfdir
172 if test $sysconfdir = '${prefix}/etc'; then
173 libc_cv_sysconfdir=/etc
175 libc_cv_sysconfdir=$sysconfdir
177 libc_cv_rootsbindir="/sbin"
180 # Under Linux the LinuxThreads add-on should be available.
182 # It is available. Good.
184 linuxthreads_missing=
187 linuxthreads_missing=yes
191 if test "$linuxthreads_missing"; then
192 if test $enable_sanity = yes; then
194 *** On GNU/Linux systems it is normal to compile GNU libc with the
195 *** \`linuxthreads' add-on. Without that, the library will be
196 *** incompatible with normal GNU/Linux systems.
197 *** If you really mean to not use this add-on, run configure again
198 *** using the extra parameter \`--disable-sanity-checks'."
202 *** WARNING: Are you sure you do not want to use the \`linuxthreads'
207 # One Linux we use ldconfig.
210 # We need some extensions to the `ldd' script.
214 ldd_rewrite_script=../sysdeps/unix/sysv/linux/ldd-rewrite.sed
217 ldd_rewrite_script=../sysdeps/unix/sysv/linux/ia64/ldd-rewrite.sed
220 ldd_rewrite_script=../sysdeps/unix/sysv/linux/s390/ldd-rewrite.sed
223 ldd_rewrite_script=../sysdeps/unix/sysv/linux/sparc/ldd-rewrite.sed
226 ldd_rewrite_script=../sysdeps/unix/sysv/linux/x86_64/ldd-rewrite.sed
233 if test $host = $build; then
234 # If $prefix/include/{net,scsi} are symlinks, make install will
235 # clobber what they're linked to (probably a kernel tree).
236 # test -L ought to work on all Linux boxes.
237 if test "x$prefix" != xNONE; then
240 ac_prefix=$ac_default_prefix
242 echo $ac_n "checking for symlinks in ${ac_prefix}/include""... $ac_c" 1>&6
243 echo "configure:244: checking for symlinks in ${ac_prefix}/include" >&5
245 if test -L ${ac_prefix}/include/net; then
246 ac_message="$ac_message
247 ${ac_prefix}/include/net is a symlink"
249 if test -L ${ac_prefix}/include/scsi; then
250 ac_message="$ac_message
251 ${ac_prefix}/include/scsi is a symlink"
253 if test -n "$ac_message"; then
254 { echo "configure: error: $ac_message
255 \`make install' will destroy the target of the link(s).
256 Delete the links and re-run configure, or better still, move the entire
257 ${ac_prefix}/include directory out of the way." 1>&2; exit 1; }
259 echo "$ac_t""ok" 1>&6