Remove linux/fanotify.h configure test.

Now we require Linux 3.2 or later kernel headers everywhere, the
configure test for <linux/fanotify.h> is obsolete; this patch removes
it.

Tested for x86_64.

	* sysdeps/unix/sysv/linux/configure.ac (linux/fanotify.h): Do not
	test for header.
	* sysdeps/unix/sysv/linux/configure: Regenerated.
	* config.h.in (HAVE_LINUX_FANOTIFY_H): Remove #undef.
	* sysdeps/unix/sysv/linux/tst-fanotify.c [!HAVE_LINUX_FANOTIFY_H]:
	Remove conditional code.
	[HAVE_LINUX_FANOTIFY_H]: Make code unconditional.

ChangeLog

@@ -1,5 +1,13 @@
 2016-02-24  Joseph Myers  <joseph@codesourcery.com>
 
+	* sysdeps/unix/sysv/linux/configure.ac (linux/fanotify.h): Do not
+	test for header.
+	* sysdeps/unix/sysv/linux/configure: Regenerated.
+	* config.h.in (HAVE_LINUX_FANOTIFY_H): Remove #undef.
+	* sysdeps/unix/sysv/linux/tst-fanotify.c [!HAVE_LINUX_FANOTIFY_H]:
+	Remove conditional code.
+	[HAVE_LINUX_FANOTIFY_H]: Make code unconditional.
+
 	* sysdeps/unix/sysv/linux/configure.ac (LIBC_LINUX_VERSION):
 	Define to 3.2.0.
 	(arch_minimum_kernel): Likewise.

config.h.in

@@ -164,9 +164,6 @@
 /* Define to 1 if STT_GNU_IFUNC support actually works.  */
 #define HAVE_IFUNC 0
 
-/* Define if linux/fanotify.h is available.  */
-#undef HAVE_LINUX_FANOTIFY_H
-
 /* Define if the linker defines __ehdr_start.  */
 #undef HAVE_EHDR_START
 

sysdeps/unix/sysv/linux/configure

@@ -1,34 +1,3 @@
-
-# ac_fn_c_check_header_compile LINENO HEADER VAR INCLUDES
-# -------------------------------------------------------
-# Tests whether HEADER exists and can be compiled using the include files in
-# INCLUDES, setting the cache variable VAR accordingly.
-ac_fn_c_check_header_compile ()
-{
-  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
-$as_echo_n "checking for $2... " >&6; }
-if eval \${$3+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-$4
-#include <$2>
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  eval "$3=yes"
-else
-  eval "$3=no"
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-fi
-eval ac_res=\$$3
-	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
-$as_echo "$ac_res" >&6; }
-  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
-
-} # ac_fn_c_check_header_compile
 # This file is generated from configure.ac by Autoconf.  DO NOT EDIT!
  # Local configure fragment for sysdeps/unix/sysv/linux.
 
@@ -137,17 +106,6 @@ else
 *** compatible kernel version" "$LINENO" 5
 fi
 
-# Until we start requiring 2.6.37+ headers, we need to check for the
-# availability of linux/fanotify.h for testing purposes.
-ac_fn_c_check_header_compile "$LINENO" "linux/fanotify.h" "ac_cv_header_linux_fanotify_h" "/* No default includes.  */
-"
-if test "x$ac_cv_header_linux_fanotify_h" = xyes; then :
-  $as_echo "#define HAVE_LINUX_FANOTIFY_H 1" >>confdefs.h
-
-fi
-
-
-
 if test -n "$sysheaders"; then
   CPPFLAGS=$OLD_CPPFLAGS
 fi

sysdeps/unix/sysv/linux/configure.ac

@@ -65,12 +65,6 @@ else
 *** compatible kernel version])
 fi
 
-# Until we start requiring 2.6.37+ headers, we need to check for the
-# availability of linux/fanotify.h for testing purposes.
-AC_CHECK_HEADER(linux/fanotify.h,
-  [AC_DEFINE(HAVE_LINUX_FANOTIFY_H)], ,
-  [/* No default includes.  */])
-
 if test -n "$sysheaders"; then
   CPPFLAGS=$OLD_CPPFLAGS
 fi

sysdeps/unix/sysv/linux/tst-fanotify.c

@@ -20,18 +20,6 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
-
-#ifndef HAVE_LINUX_FANOTIFY_H
-
-static int
-do_test (void)
-{
-  puts ("SKIP: missing support for fanotify due to old kernel headers");
-  return 0;
-}
-
-#else
-
 #include <sys/fanotify.h>
 
 static int
@@ -69,7 +57,5 @@ do_test (void)
   return 0;
 }
 
-#endif
-
 #define TEST_FUNCTION do_test ()
 #include "../test-skeleton.c"