b46d250656
The kernel version check is used to avoid glibc to run on older kernels where some syscall are not available and fallback code are not enabled to handle graciously fail. However, it does not prevent if the kernel does not correctly advertise its version through vDSO note, uname or procfs. Also kernel version checks are sometime not desirable by users, where they want to deploy on different system with different kernel version knowing the minimum set of syscall is always presented on such systems. The kernel version check has been removed along with the LD_ASSUME_KERNEL environment variable. The minimum kernel used to built glibc is still provided through NT_GNU_ABI_TAG ELF note and also printed when libc.so is issued. Checked on x86_64-linux-gnu.
125 lines
5 KiB
Plaintext
125 lines
5 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
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# Local configure fragment for sysdeps/unix/sysv/linux.
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define([LIBC_LINUX_VERSION],[3.2.0])dnl
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if test -n "$sysheaders"; then
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OLD_CPPFLAGS=$CPPFLAGS
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CPPFLAGS="$CPPFLAGS $SYSINCLUDES"
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fi
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define([libc_cv_linuxVER], [libc_cv_linux]patsubst(LIBC_LINUX_VERSION,[\.]))dnl
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AC_CACHE_CHECK(installed Linux kernel header files, libc_cv_linuxVER, [dnl
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AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[#include <linux/version.h>
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#if !defined LINUX_VERSION_CODE || LINUX_VERSION_CODE < ]dnl
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patsubst(LIBC_LINUX_VERSION,[^\([^.]*\)\.\([^.]*\)\.\([^.]*\)$],dnl
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[ (\1 *65536+ \2 *256+ \3) /* \1.\2.\3 */])[
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# error kernel headers missing or too old
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#endif]], [[]])],
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[libc_cv_linuxVER='LIBC_LINUX_VERSION or later'],
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[libc_cv_linuxVER='missing or too old!'])])
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if test "$libc_cv_linuxVER" != 'LIBC_LINUX_VERSION or later'; then
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AC_MSG_ERROR([GNU libc requires kernel header files from
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Linux LIBC_LINUX_VERSION or later to be installed before configuring.
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The kernel header files are found usually in /usr/include/asm and
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/usr/include/linux; make sure these directories use files from
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Linux LIBC_LINUX_VERSION or later. This check uses <linux/version.h>, so
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make sure that file was built correctly when installing the kernel header
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files. To use kernel headers not from /usr/include/linux, use the
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configure option --with-headers.])
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fi
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# If the user gave a minimal version number test whether the available
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# kernel headers are young enough. Additionally we have minimal
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# kernel versions for some architectures. If a previous configure fragment
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# set arch_minimum_kernel already, let that override our defaults here.
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# Note that we presume such a fragment has set libc_cv_gcc_unwind_find_fde
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# if appropriate too.
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test -n "$arch_minimum_kernel" || arch_minimum_kernel=3.2.0
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if test -n "$minimum_kernel"; then
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changequote(,)
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user_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
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arch_version=$((`echo "$arch_minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
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changequote([,])
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if test $user_version -lt $arch_version; then
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AC_MSG_WARN([minimum kernel version reset to $arch_minimum_kernel])
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minimum_kernel=$arch_minimum_kernel
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fi
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else
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minimum_kernel=$arch_minimum_kernel
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fi
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AC_MSG_CHECKING(for kernel header at least $minimum_kernel)
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changequote(,)dnl
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decnum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/(\1 * 65536 + \2 * 256 + \3)/'`;
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abinumstr=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1.\2.\3/'`;
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abinum=`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1,\2,\3/'`;
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changequote([,])dnl
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AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[#include <linux/version.h>
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#if LINUX_VERSION_CODE < $decnum
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# error kernel headers too old
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#endif]], [[]])], [libc_minimum_kernel=ok], [libc_minimum_kernel='too old!'])
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AC_MSG_RESULT($libc_minimum_kernel)
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if test "$libc_minimum_kernel" = ok; then
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AC_DEFINE_UNQUOTED(__LINUX_KERNEL_VERSION, $decnum)
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AC_DEFINE_UNQUOTED(__LINUX_KERNEL_VERSION_STR, "$abinumstr")
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AC_DEFINE_UNQUOTED(__ABI_TAG_VERSION, $abinum)
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else
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AC_MSG_ERROR([*** The available kernel headers are older than the requested
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*** compatible kernel version])
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fi
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if test -n "$sysheaders"; then
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CPPFLAGS=$OLD_CPPFLAGS
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fi
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if test "$prefix" = "/usr/local" -o "$prefix" = "/usr/local/" -o "$prefix" = "NONE"; then
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if test $enable_sanity = yes; then
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echo "\
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*** On GNU/Linux systems the GNU C Library should not be installed into
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*** /usr/local since this might make your system totally unusable.
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*** We strongly advise to use a different prefix. For details read the FAQ.
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*** If you really mean to do this, run configure again using the extra
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*** parameter \`--disable-sanity-checks'."
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exit 1
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else
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echo "\
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*** WARNING: Do you really want to install the GNU C Library into /usr/local?
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*** This might make your system totally unusable, for details read the FAQ."
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fi
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fi
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# One Linux we use ldconfig.
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use_ldconfig=yes
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if test $host = $build; then
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# If $prefix/include/{net,scsi} are symlinks, make install will
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# clobber what they're linked to (probably a kernel tree).
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# test -L ought to work on all Linux boxes.
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if test "x$prefix" != xNONE; then
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ac_prefix=$prefix
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else
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ac_prefix=$ac_default_prefix
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fi
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AC_MSG_CHECKING([for symlinks in ${ac_prefix}/include])
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ac_message=
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if test -L ${ac_prefix}/include/net; then
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ac_message="$ac_message
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${ac_prefix}/include/net is a symlink"
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fi
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if test -L ${ac_prefix}/include/scsi; then
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ac_message="$ac_message
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${ac_prefix}/include/scsi is a symlink"
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fi
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if test -n "$ac_message"; then
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AC_MSG_ERROR([$ac_message
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\`make install' will destroy the target of the link(s).
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Delete the links and re-run configure, or better still, move the entire
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${ac_prefix}/include directory out of the way.])
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else
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AC_MSG_RESULT(ok)
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fi
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fi
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# We have inlined syscalls.
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AC_DEFINE(HAVE_INLINED_SYSCALLS)
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