Add a more useful error message if dlopen fails

Previously, we were printing only the name of the library that we failed to
open. Now, we also print the underlying cause for the failure, (as reported
by dlerror).

diff --git a/glaze-gl.c b/glaze-gl.c
index 0c2eada8d458ea1ca672a1e9a90df365032909ce..b6e7d72d3f8f9317a4ae03136f73b1ff9f444fa7 100644 (file)
--- a/glaze-gl.c
+++ b/glaze-gl.c
@@ -63,9 +63,11 @@ open_wrapper_handle (void)
                exit (1);
        }
 
+       dlerror ();
        wrapper_handle = dlopen (path, RTLD_LAZY);
        if (wrapper_handle == NULL) {
-               fprintf (stderr, "Error: Failed to dlopen %s\n", path);
+               const char *error = dlerror();
+               fprintf (stderr, "Error: Failed to dlopen %s: %s\n", path, error);
                exit (1);
        }
 }