Update.

1998-08-12  Andreas Jaeger  <aj@arthur.rhein-neckar.de>

	* sysdeps/unix/sysv/linux/configure.in: Obey --with-headers,
	document it.

	* sysdeps/unix/sysv/linux/alpha/configure.in: New file, contains
	test for recent Linux 2.1.100+ headers.

4 files changed, 108 insertions, 7 deletions

diff --git a/sysdeps/unix/sysv/linux/alpha/configure b/sysdeps/unix/sysv/linux/alpha/configure
new file mode 100755
index 0000000000..5b36e71719
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/configure
@@ -0,0 +1,51 @@
+ # Local configure fragment for sysdeps/unix/sysv/linux/alpha.
+
+# 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""... $ac_c" 1>&6
+echo "configure:13: checking installed Linux kernel header files" >&5
+if eval "test \"`echo '$''{'libc_cv_linux21100'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  cat > conftest.$ac_ext <<EOF
+#line 18 "configure"
+#include "confdefs.h"
+#include <linux/version.h>
+int main() {
+#if LINUX_VERSION_CODE <  (2 *65536+ 1 *256+ 100) /* 2.1.100 */
+eat flaming death
+#endif
+; return 0; }
+EOF
+if { (eval echo configure:27: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+  rm -rf conftest*
+  libc_cv_linux21100='2.1.100 or later'
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  libc_cv_linux21100='TOO OLD!'
+fi
+rm -f conftest*
+fi
+
+echo "$ac_t""$libc_cv_linux21100" 1>&6
+if test "$libc_cv_linux21100" != '2.1.100 or later'; then
+  { echo "configure: error: GNU libc requires kernel header files from
+Linux 2.1.100 or later to be installed before configuring.
+The kernel header files are found usually in /usr/include/asm and
+/usr/include/linux; make sure these directories use files from
+Linux 2.1.100 or later.  This check uses <linux/version.h>, so
+make sure that file was built correctly when installing the kernel header
+files.  To use kernel headers not from /usr/include/linux, use the
+configure option --with-headers." 1>&2; exit 1; }
+fi
+if test -n "$sysheaders"; then
+  CFLAGS=$OLD_CFLAGS
+fi
diff --git a/sysdeps/unix/sysv/linux/alpha/configure.in b/sysdeps/unix/sysv/linux/alpha/configure.in
new file mode 100644
index 0000000000..690defa98b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/configure.in
@@ -0,0 +1,36 @@
+sinclude(./aclocal.m4)dnl Autoconf lossage
+GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
+# Local configure fragment for sysdeps/unix/sysv/linux/alpha.
+
+# Don't bother trying to generate any glue code to be compatible with the
+# existing system library, because we are the only system library.
+inhibit_glue=yes
+
+define([LIBC_LINUX_VERSION],[2.1.100])dnl
+if test -n "$sysheaders"; then
+  OLD_CFLAGS=$CFLAGS
+  CFLAGS="$CFLAGS $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 LINUX_VERSION_CODE < ]dnl
+patsubst(LIBC_LINUX_VERSION,[^\([^.]*\)\.\([^.]*\)\.\([^.]*\)$],dnl
+[ (\1 *65536+ \2 *256+ \3) /* \1.\2.\3 */])[
+eat flaming death
+#endif],
+	       libc_cv_linuxVER='LIBC_LINUX_VERSION or later',
+	       libc_cv_linuxVER='TOO OLD!')])
+if test "$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 test -n "$sysheaders"; then
+  CFLAGS=$OLD_CFLAGS
+fi
diff --git a/sysdeps/unix/sysv/linux/configure b/sysdeps/unix/sysv/linux/configure
index 2b8483c370..a55ba24fe2 100644
--- a/sysdeps/unix/sysv/linux/configure
+++ b/sysdeps/unix/sysv/linux/configure
@@ -7,13 +7,17 @@ test $stdio = default && stdio=libio
 # 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""... $ac_c" 1>&6
-echo "configure:12: checking installed Linux kernel header files" >&5
+echo "configure:16: checking installed Linux kernel header files" >&5
 if eval "test \"`echo '$''{'libc_cv_linux2010'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 17 "configure"
+#line 21 "configure"
 #include "confdefs.h"
 #include <linux/version.h>
 int main() {
@@ -22,7 +26,7 @@ eat flaming death
 #endif
 ; return 0; }
 EOF
-if { (eval echo configure:26: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
+if { (eval echo configure:30: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then
   rm -rf conftest*
   libc_cv_linux2010='2.0.10 or later'
 else
@@ -42,9 +46,12 @@ The kernel header files are found usually in /usr/include/asm and
 /usr/include/linux; make sure these directories use files from
 Linux 2.0.10 or later.  This check uses <linux/version.h>, so
 make sure that file was built correctly when installing the kernel header
-files." 1>&2; exit 1; }
+files.  To use kernel headers not from /usr/include/linux, use the
+configure option --with-headers." 1>&2; exit 1; }
+fi
+if test -n "$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
diff --git a/sysdeps/unix/sysv/linux/configure.in b/sysdeps/unix/sysv/linux/configure.in
index 2e7e944aa5..535cd8f41d 100644
--- a/sysdeps/unix/sysv/linux/configure.in
+++ b/sysdeps/unix/sysv/linux/configure.in
@@ -10,6 +10,10 @@ test $stdio = default && stdio=libio
 inhibit_glue=yes
 
 define([LIBC_LINUX_VERSION],[2.0.10])dnl
+if test -n "$sysheaders"; then
+  OLD_CFLAGS=$CFLAGS
+  CFLAGS="$CFLAGS $SYSINCLUDES"
+fi
 define([libc_cv_linuxVER], [libc_cv_linux]patsubst(LIBC_LINUX_VERSION,[\.]))dnl
 AC_CACHE_CHECK(installed Linux kernel header files, libc_cv_linuxVER, [dnl
 AC_TRY_COMPILE([#include <linux/version.h>],
@@ -27,9 +31,12 @@ The kernel header files are found usually in /usr/include/asm and
 /usr/include/linux; make sure these directories use files from
 Linux LIBC_LINUX_VERSION or later.  This check uses <linux/version.h>, so
 make sure that file was built correctly when installing the kernel header
-files.])
+files.  To use kernel headers not from /usr/include/linux, use the
+configure option --with-headers.])
+fi
+if test -n "$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