patch to allow target defined solib search method

["Kris Warkentin" <kewarken@qnx.com>]

The following patch allows a target to define a function for finding shared
libraries.  This prevents target back ends from having to monkey with
solib-search-path.

ChangeLog entry

    Add target function hook for searching out solibs.
    * solib.c: solib_open(): call search function after failing with
solib-search-path
    * solist.h: struct target_so_ops: add find_and_open_solib function hook,
create define
                                TARGET_SO_FIND_AND_OPEN_SOLIB

cheers,

Kris

Index: solib.c
===================================================================
RCS file: /cvs/src/src/gdb/solib.c,v
retrieving revision 1.54
diff -u -r1.54 solib.c
--- solib.c 20 Feb 2003 18:25:27 -0000 1.54
+++ solib.c 21 Feb 2003 22:18:44 -0000
@@ -160,6 +160,10 @@
                         1, lbasename (in_pathname), O_RDONLY, 0,
                         &temp_pathname);

+  /* If not found, next use target supplied solib search method (if
existing) */
+  if (found_file < 0 && TARGET_SO_FIND_AND_OPEN_SOLIB)
+   found_file = TARGET_SO_FIND_AND_OPEN_SOLIB (in_pathname, O_RDONLY,
&temp_pathname);
+
   /* If not found, next search the inferior's $PATH environment variable.
*/
   if (found_file < 0 && solib_search_path != NULL)
     found_file = openp (get_in_environ (inferior_environ, "PATH"),
Index: solist.h
===================================================================
RCS file: /cvs/src/src/gdb/solist.h,v
retrieving revision 1.7
diff -u -r1.7 solist.h
--- solist.h 21 Oct 2001 19:20:30 -0000 1.7
+++ solist.h 21 Feb 2003 22:18:44 -0000
@@ -99,6 +99,11 @@
     /* Determine if PC lies in the dynamic symbol resolution code of
        the run time loader */
     int (*in_dynsym_resolve_code) (CORE_ADDR pc);
+
+    /* Extra hook for finding and opening a solib.  Convenience function
+       for remote debuggers finding host libs */
+    int (*find_and_open_solib) (char *soname, unsigned o_flags, char
**temp_pathname);
+
   };

 void free_so (struct so_list *so);
@@ -122,5 +127,7 @@
   (current_target_so_ops->open_symbol_file_object)
 #define TARGET_SO_IN_DYNSYM_RESOLVE_CODE \
   (current_target_so_ops->in_dynsym_resolve_code)
+#define TARGET_SO_FIND_AND_OPEN_SOLIB \
+  (current_target_so_ops->find_and_open_solib)

 #endif