As a followup to the discussion earlier this week, I'd like to suggest the patch below. This causes ltdl to _always_ set handler->info.name to a canonicalized library name, instead of only doing it for libtool-created modules. The only disadvantage that I can see to doing this is that when lt_dlsym is called for a non-libtool module, a spurious lookup for "modulename_LTX_symbol" will be done, when it wasn't before. I can't see how this would cause an actual problem for anyone, though, since it's not likely they'd have symbols named that way if they're not using libtool to create their libraries.
With this change, lt_dlsym()-ing a symbol from a preloaded library works properly on my system; it searches for the symbol with the *_LTX_ prefix, which means I don't have to forcibly add that prefix in my code.
--- ltdl.dist Wed Oct 15 07:11:08 2003 +++ ltdl.c Wed Oct 15 07:37:39 2003 @@ -3092,8 +3092,34 @@
assert (base_name && *base_name);
- /* Check whether we are opening a libtool module (.la extension). */
ext = strrchr (base_name, '.');
+
+ /* extract the module name from the file name */
+ name = LT_EMALLOC (char, ext - base_name + 1);
+ if (!name)
+ {
+ ++errors;
+ goto cleanup;
+ }
+
+ /* canonicalize the module name */
+ {
+ size_t i;
+ for (i = 0; i < ext - base_name; ++i)
+ {
+ if (isalnum ((int)(base_name[i])))
+ {
+ name[i] = base_name[i];
+ }
+ else
+ {
+ name[i] = '_';
+ }
+ }
+ name[ext - base_name] = LT_EOS_CHAR;
+ }
+
+ /* Check whether we are opening a libtool module (.la extension). */
if (ext && strcmp (ext, archive_ext) == 0)
{
/* this seems to be a libtool module */
@@ -3110,31 +3136,6 @@
of libtool */
int installed = 1;- /* extract the module name from the file name */
- name = LT_EMALLOC (char, ext - base_name + 1);
- if (!name)
- {
- ++errors;
- goto cleanup;
- }
-
- /* canonicalize the module name */
- {
- size_t i;
- for (i = 0; i < ext - base_name; ++i)
- {
- if (isalnum ((int)(base_name[i])))
- {
- name[i] = base_name[i];
- }
- else
- {
- name[i] = '_';
- }
- }
- name[ext - base_name] = LT_EOS_CHAR;
- }
-
/* Now try to open the .la file. If there is no directory name
component, try to find it first in user_search_path and then other
prescribed paths. Otherwise (or in any case if the module was not
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