If an environment variable is specified set the return value from main() to
non-zero if the loader had errors (missing libraries, generally).

Upstream-Status: Pending
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/gdk-pixbuf/queryloaders.c b/gdk-pixbuf/queryloaders.c
index a9ca015..395674a 100644
--- a/gdk-pixbuf/queryloaders.c
+++ b/gdk-pixbuf/queryloaders.c
@@ -146,7 +146,7 @@ write_loader_info (GString *contents, const char *path, GdkPixbufFormat *info)
         g_string_append_c (contents, '\n');
 }
 
-static void
+static gboolean
 query_module (GString *contents, const char *dir, const char *file)
 {
         char *path;
@@ -155,6 +155,7 @@ query_module (GString *contents, const char *dir, const char *file)
         void                    (*fill_vtable)   (GdkPixbufModule *module);
         gpointer fill_info_ptr;
         gpointer fill_vtable_ptr;
+        gboolean ret = TRUE;
 
         if (g_path_is_absolute (file))
                 path = g_strdup (file);
@@ -204,10 +205,13 @@ query_module (GString *contents, const char *dir, const char *file)
                                    g_module_error());
                 else
                         g_fprintf (stderr, "Cannot load loader %s\n", path);
+                ret = FALSE;
         }
         if (module)
                 g_module_close (module);
         g_free (path);
+
+        return ret;
 }
 
 #ifdef G_OS_WIN32
@@ -257,6 +261,7 @@ int main (int argc, char **argv)
         GString *contents;
         gchar *cache_file = NULL;
         gint first_file = 1;
+        gboolean success = TRUE;
 
 #ifdef G_OS_WIN32
         gchar *libdir;
@@ -360,7 +365,8 @@ int main (int argc, char **argv)
                                 gint len = strlen (dent);
                                 if (len > SOEXT_LEN &&
                                     strcmp (dent + len - SOEXT_LEN, SOEXT) == 0) {
-                                        query_module (contents, path, dent);
+                                        if (!query_module (contents, path, dent))
+                                                success = FALSE;
                                 }
                         }
                         g_dir_close (dir);
@@ -378,7 +384,8 @@ int main (int argc, char **argv)
                         infilename = g_locale_to_utf8 (infilename,
                                                        -1, NULL, NULL, NULL);
 #endif
-                        query_module (contents, cwd, infilename);
+                        if (!query_module (contents, cwd, infilename))
+                                success = FALSE;
                 }
                 g_free (cwd);
         }
@@ -394,5 +401,8 @@ int main (int argc, char **argv)
         else
                 g_print ("%s\n", contents->str);
 
-        return 0;
+        if (g_getenv ("GDK_PIXBUF_FATAL_LOADER"))
+                return success ? 0 : 1;
+        else
+                return 0;
 }