[folks] Expose the details of which backends are enabled to libfolks.

[Travis Reitter <treitter src gnome org>]

commit 1432a353880ad1d1784b20f5edb90fc6179558cd
Author: Travis Reitter <travis reitter collabora co uk>
Date:   Wed Oct 26 17:28:56 2011 -0700

    Expose the details of which backends are enabled to libfolks.
    
    Helps: bgo#662274 - Failed to link personas: Can't link personas with
    no primary store.

 configure.ac          |   20 +++++++++++++++++++-
 folks/build-conf.vapi |    9 +++++++++
 2 files changed, 28 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 22141fa..0088d2c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -77,12 +77,27 @@ AC_ARG_ENABLE(tracker-backend,
 
 AM_CONDITIONAL([ENABLE_TRACKER], [test "x$enable_tracker_backend" = "xyes"])
 
+if test "x$enable_tracker_backend" = "xyes"; then
+        AC_DEFINE(HAVE_TRACKER, [1],
+                  [Define as 1 if you have the Tracker backend])
+else
+        AC_DEFINE(HAVE_TRACKER, [0],
+                  [Define as 1 if you have the Tracker backend])
+fi
+
 AC_ARG_ENABLE(eds-backend,
         AC_HELP_STRING([--enable-eds-backend],
                        [ build the E-D-S backend]),
         enable_eds_backend=$enableval,
         enable_eds_backend=yes )
 
+if test "x$enable_eds_backend" = "xyes"; then
+        AC_DEFINE(HAVE_EDS, [1], [Define as 1 if you have the eds backend])
+else
+        AC_DEFINE(HAVE_EDS, [0], [Define as 1 if you have the eds backend])
+fi
+
+
 AM_CONDITIONAL([ENABLE_EDS], [test "x$enable_eds_backend" = "xyes"])
 
 # Automatically check the dependencies for the libsocialweb backend
@@ -93,6 +108,9 @@ AC_ARG_ENABLE(libsocialweb-backend,
         enable_libsocialweb_backend=$enableval,
         enable_libsocialweb_backend=auto )
 
+# this may be overwritten farther down
+AC_DEFINE(HAVE_LIBSOCIALWEB, [0],
+          [Define as 1 if you have the libsocialweb backend])
 if test "x$enable_libsocialweb_backend" != "xno"; then
   PKG_CHECK_MODULES([SW_CLIENT], [libsocialweb-client >= $SW_CLIENT_REQUIRED],
       have_libsocialweb_backend="yes", have_libsocialweb_backend="no")
@@ -107,7 +125,7 @@ if test "x$enable_libsocialweb_backend" != "xno"; then
   fi
 
   if test "x$have_libsocialweb_backend" = "xyes"; then
-    AC_DEFINE(HAVE_LIBSOCIALWEB, [],
+    AC_DEFINE(HAVE_LIBSOCIALWEB, [1],
               [Define if you have the libsocialweb backend])
   fi
 else
diff --git a/folks/build-conf.vapi b/folks/build-conf.vapi
index 82c36c3..e9ceafc 100644
--- a/folks/build-conf.vapi
+++ b/folks/build-conf.vapi
@@ -44,4 +44,13 @@ public class Folks.BuildConf
 
   [CCode (cname = "LOCALE_DIR")]
   public static const string LOCALE_DIR;
+
+  [CCode (cname = "HAVE_EDS")]
+  public static bool HAVE_EDS;
+
+  [CCode (cname = "HAVE_LIBSOCIALWEB")]
+  public static bool HAVE_LIBSOCIALWEB;
+
+  [CCode (cname = "HAVE_TRACKER")]
+  public static bool HAVE_TRACKER;
 }