ansi-c++-opt: Provide option --enable-c++/--disable-c++ when possible.

[gnulib.git] / m4 / selinux-selinux-h.m4

diff --git a/m4/selinux-selinux-h.m4 b/m4/selinux-selinux-h.m4
index c6e735c..35d2dbe 100644 (file)
--- a/m4/selinux-selinux-h.m4
+++ b/m4/selinux-selinux-h.m4
@@ -1,20 +1,45 @@
-# serial 2   -*- Autoconf -*-
-# Copyright (C) 2006, 2007, 2009 Free Software Foundation, Inc.
+# serial 3   -*- Autoconf -*-
+# Copyright (C) 2006-2007, 2009-2010 Free Software Foundation, Inc.
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
 # From Jim Meyering
 # Provide <selinux/selinux.h>, if necessary.
+# If it is already present, provide wrapper functions to guard against
+# misbehavior from getfilecon, lgetfilecon, and fgetfilecon.
 
 AC_DEFUN([gl_HEADERS_SELINUX_SELINUX_H],
 [
-  # Check for <selinux/selinux.h>,
-  AC_CHECK_HEADERS([selinux/selinux.h],
-                  [SELINUX_SELINUX_H=],
-                  [SELINUX_SELINUX_H=selinux/selinux.h])
-  AC_SUBST([SELINUX_SELINUX_H])
+  AC_REQUIRE([gl_LIBSELINUX])
+  AC_CHECK_HEADERS([selinux/selinux.h])
 
+  if test "$ac_cv_header_selinux_selinux_h" = yes; then
+    # We do have <selinux/selinux.h>, so do compile getfilecon.c
+    # and arrange to use its wrappers.
+    AC_LIBOBJ([getfilecon])
+    gl_CHECK_NEXT_HEADERS([selinux/selinux.h])
+    AC_DEFINE([getfilecon], [rpl_getfilecon],
+              [Always use our getfilecon wrapper.])
+    AC_DEFINE([lgetfilecon], [rpl_lgetfilecon],
+              [Always use our lgetfilecon wrapper.])
+    AC_DEFINE([fgetfilecon], [rpl_fgetfilecon],
+              [Always use our fgetfilecon wrapper.])
+  fi
+
+  case "$ac_cv_search_setfilecon:$ac_cv_header_selinux_selinux_h" in
+    no:*) # already warned
+      ;;
+    *:no)
+      AC_MSG_WARN([libselinux was found but selinux/selinux.h is missing.])
+      AC_MSG_WARN([AC_PACKAGE_NAME will be compiled without SELinux support.])
+  esac
+])
+
+AC_DEFUN([gl_LIBSELINUX],
+[
+  AC_REQUIRE([AC_CANONICAL_HOST])
+  AC_REQUIRE([AC_CANONICAL_BUILD])
   LIB_SELINUX=
   gl_save_LIBS=$LIBS
   AC_SEARCH_LIBS([setfilecon], [selinux],
@@ -22,4 +47,11 @@ AC_DEFUN([gl_HEADERS_SELINUX_SELINUX_H],
                   LIB_SELINUX=$ac_cv_search_setfilecon])
   AC_SUBST([LIB_SELINUX])
   LIBS=$gl_save_LIBS
+
+  # Warn if SELinux is found but libselinux is absent;
+  if test "$ac_cv_search_setfilecon" = no &&
+     test "$host" = "$build" && test -d /selinux; then
+    AC_MSG_WARN([This system supports SELinux but libselinux is missing.])
+    AC_MSG_WARN([AC_PACKAGE_NAME will be compiled without SELinux support.])
+  fi
 ])