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libvirt/m4/virt-selinux.m4
Eric Blake 5ea3a690a2 build: accomodate selinux 2.5 header API change
Yet again, selinux has been adding const-correctness; this change
is ABI-compatible, but breaks API, which affects us when we try to
override things in our testsuite:

../../tests/securityselinuxhelper.c:307:24: error: conflicting types for 'selabel_open'
 struct selabel_handle *selabel_open(unsigned int backend,
                        ^~~~~~~~~~~~
In file included from ../../tests/securityselinuxhelper.c:32:0:
/usr/include/selinux/label.h:73:24: note: previous declaration of 'selabel_open' was here

The problem is a new 'const' prior to the second parameter.

Fix it the same way we did in commit 292d3f2d: check for the new
const at configure time.

Signed-off-by: Eric Blake <eblake@redhat.com>
2016-02-24 15:14:30 -07:00

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dnl The libselinux.so library
dnl
dnl Copyright (C) 2012-2014, 2016 Red Hat, Inc.
dnl
dnl This library is free software; you can redistribute it and/or
dnl modify it under the terms of the GNU Lesser General Public
dnl License as published by the Free Software Foundation; either
dnl version 2.1 of the License, or (at your option) any later version.
dnl
dnl This library is distributed in the hope that it will be useful,
dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
dnl Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public
dnl License along with this library. If not, see
dnl <http://www.gnu.org/licenses/>.
dnl
AC_DEFUN([LIBVIRT_CHECK_SELINUX],[
LIBVIRT_CHECK_LIB([SELINUX], [selinux],
[fgetfilecon_raw], [selinux/selinux.h])
AC_ARG_WITH([selinux_mount],
[AS_HELP_STRING([--with-selinux-mount],
[set SELinux mount point @<:@default=check@:>@])],
[],
[with_selinux_mount=check])
if test "$with_selinux" = "yes"; then
# libselinux changed signatures between 2.2 and 2.3
AC_CACHE_CHECK([for selinux setcon parameter type], [lv_cv_setcon_const],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[
#include <selinux/selinux.h>
int setcon(char *context);
]])],
[lv_cv_setcon_const=''],
[lv_cv_setcon_const='const'])])
AC_DEFINE_UNQUOTED([VIR_SELINUX_CTX_CONST], [$lv_cv_setcon_const],
[Define to empty or 'const' depending on how SELinux qualifies its
security context parameters])
# ...and again for 2.5
AC_CACHE_CHECK([for selinux selabel_open parameter type],
[lv_cv_selabel_open_const],
[AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[
#include <selinux/selinux.h>
#include <selinux/label.h>
struct selabel_handle *selabel_open(unsigned, struct selinux_opt *, unsigned);
]])],
[lv_cv_selabel_open_const=''],
[lv_cv_selabel_open_const='const'])])
AC_DEFINE_UNQUOTED([VIR_SELINUX_OPEN_CONST], [$lv_cv_selabel_open_const],
[Define to empty or 'const' depending on how SELinux qualifies its
selabel_open parameter])
AC_MSG_CHECKING([SELinux mount point])
if test "$with_selinux_mount" = "check" || test -z "$with_selinux_mount"; then
if test -d /sys/fs/selinux ; then
SELINUX_MOUNT=/sys/fs/selinux
else
SELINUX_MOUNT=/selinux
fi
else
SELINUX_MOUNT=$with_selinux_mount
fi
AC_MSG_RESULT([$SELINUX_MOUNT])
AC_DEFINE_UNQUOTED([SELINUX_MOUNT], ["$SELINUX_MOUNT"], [SELinux mount point])
dnl We prefer to use <selinux/label.h> and selabel_open, but can fall
dnl back to matchpathcon for the sake of RHEL 5's version of libselinux.
AC_CHECK_HEADERS([selinux/label.h])
fi
])
AC_DEFUN([LIBVIRT_RESULT_SELINUX],[
LIBVIRT_RESULT_LIB([SELINUX])
])