meson: Add an option to build XSELINUX.

Dependencies are ported from the automake build.

v2: Make it a tristate defaulting to 'auto'.  Use pkg-config for libaudit.

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Adam Jackson <ajax@redhat.com>

meson.build

@@ -442,9 +442,6 @@ elif get_option('mitshm') == 'true'
     build_mitshm = true
 endif
 
-# XXX: Allow configuration of these.
-build_xselinux = false
-
 m_dep = cc.find_library('m', required : false)
 dl_dep = cc.find_library('dl', required : false)
 
@@ -506,6 +503,23 @@ inc = include_directories(
     'xfixes',
 )
 
+build_xselinux = false
+if get_option('xselinux') != 'false'
+    dep_selinux = dependency('libselinux', version: '>= 2.0.86',
+			     required: get_option('xselinux') == 'true')
+    dep_audit = dependency('audit', required: get_option('xselinux') == 'true')
+    if get_option('xselinux') == 'true'
+        build_xselinux = true
+    else
+        build_xselinux = dep_selinux.found() and dep_audit.found()
+    endif
+
+    if build_xselinux
+        common_dep += dep_selinux
+        common_dep += dep_audit
+    endif
+endif
+
 glx_inc = include_directories('glx')
 
 top_srcdir_inc = include_directories('.')

meson_options.txt

@@ -80,6 +80,8 @@ option('xres', type: 'boolean', value: true,
        description: 'XRes extension')
 option('xace', type: 'boolean', value: true,
        description: 'X-ACE extension')
+option('xselinux', type: 'combo', choices: ['true', 'false', 'auto'], value: 'auto',
+       description: 'XSELINUX extension')
 option('xinerama', type: 'boolean', value: true,
        description: 'Xinerama extension')
 option('xcsecurity', type: 'boolean', value: false,