gentoo-overlay/sys-freebsd/freebsd-libexec/files/freebsd-libexec-7.0-libfallback.patch

--- rtld-elf/rtld.c.orig	2007-04-07 23:17:00 +0000
+++ rtld-elf/rtld.c	2007-04-23 09:42:32 +0000
@@ -988,6 +988,103 @@
     return NULL;
 }
 
+#define MAX_LIBRARIES_HITS 255
+
+struct fill_library_paths_args {
+    const char  *name;
+    size_t       namelen;
+    char       **libraries;
+    size_t      *count;
+};
+
+static void *
+fill_library_paths(const char *dir, size_t dirlen, void *param)
+{
+    struct fill_library_paths_args *arg;
+    
+    arg = param;
+    if (*(arg->count) > MAX_LIBRARIES_HITS)
+	return (NULL);
+
+    if (*dir == '/' || trust) {
+	arg->libraries[*(arg->count)] = malloc(sizeof(char)*(dirlen + 1 + arg->namelen + 1));
+	strncpy(arg->libraries[*(arg->count)], dir, dirlen);
+	arg->libraries[*(arg->count)][dirlen] = '/';
+	strncpy(arg->libraries[*(arg->count)] + dirlen + 1, arg->name, arg->namelen+1);
+	
+	dbg("  Trying \"%s\"\n", arg->libraries[*(arg->count)]);
+	if (access(arg->libraries[*(arg->count)], F_OK) == 0) {
+	    *(arg->count) += 1;
+	}
+    }
+    return (NULL);
+}
+
+/**
+ * Find all libraries matching xname for the object refobj (if not null), like
+ * find_library but find all the matching libraries in the paths.
+ *
+ * The returned pointer has to be free()'d (as well as the contained strings)
+ * if it's non-NULL.
+ * The end of the array is found when the pointer gets NULL.
+ */
+static char **find_libraries(const char *xname, const Obj_Entry *refobj)
+{
+    char **libraries;
+    size_t libraries_count;
+    struct fill_library_paths_args arg;
+    char *name;
+
+    if (strchr(xname, '/') != NULL) {	/* Hard coded pathname */
+	if (xname[0] != '/' && !trust) {
+	    _rtld_error("Absolute pathname required for shared object \"%s\"",
+	      xname);
+	    return NULL;
+	}
+	libraries = malloc(sizeof(char*)*2);
+	libraries[0] = xstrdup(xname);
+	libraries[1] = NULL;
+	return libraries;
+    }
+
+    if (libmap_disable || (refobj == NULL) ||
+	(name = lm_find(refobj->path, xname)) == NULL)
+	name = (char *)xname;
+
+    dbg(" Searching for \"%s\"", name);
+
+    /* look up at maximum 255 libraries, would be crazy going over that */
+    libraries = malloc(sizeof(char*)*(MAX_LIBRARIES_HITS+1));
+    libraries_count = 0;
+    
+    arg.name = name;
+    arg.namelen = strlen(name);
+    arg.libraries = libraries;
+    arg.count = &libraries_count;
+    
+    path_enumerate(ld_library_path, fill_library_paths, &arg);
+    if(refobj != NULL)
+        path_enumerate(refobj->rpath, fill_library_paths, &arg);
+    path_enumerate(gethints(), fill_library_paths, &arg);
+    path_enumerate(STANDARD_LIBRARY_PATH, fill_library_paths, &arg);
+
+    libraries[libraries_count] = NULL;
+
+    if(libraries_count == 0) {
+        if(refobj != NULL && refobj->path != NULL) {
+            _rtld_error("Shared object \"%s\" not found, required by \"%s\"",
+	       name, basename(refobj->path));
+        } else {
+            _rtld_error("Shared object \"%s\" not found", name);
+        }
+
+	free(libraries);
+	return NULL;
+    }
+
+    return libraries;
+}
+
 /*
  * Given a symbol number in a referencing object, find the corresponding
  * definition of the symbol.  Returns a pointer to the symbol, or NULL if
@@ -1260,7 +1357,29 @@
 	Needed_Entry *needed;
 
 	for (needed = obj->needed;  needed != NULL;  needed = needed->next) {
-	    needed->obj = load_object(obj->strtab + needed->name, obj);
+	    const char *name = obj->strtab + needed->name;
+	    char **paths = find_libraries(name, obj);
+	    char **curpath = paths;
+
+	    needed->obj = NULL;
+    	    if (paths == NULL) {
+	    if (ld_tracing)
+		continue;
+	    else
+		return -1;
+	    }
+
+	    while(*curpath) {
+		if (needed->obj == NULL) {
+		    needed->obj = load_object(*curpath, NULL);
+		    curpath++;
+		    continue;
+		}
+		/* Continue, so that we can free the whole lot */
+		free(*curpath);
+		curpath++;
+	    }
+	    free(paths);
 	    if (needed->obj == NULL && !ld_tracing)
 		return -1;
 	}