gdb: add program_space parameter to clear_solib

Make the current_program_space reference bubble up one level.

Remove one unnecessary declaration of clear_solib.

Change-Id: I234e2c8c0b71713364fc7b76cee2bee2b026bd6d
Approved-By: Andrew Burgess <aburgess@redhat.com>

gdb/corelow.c

@@ -335,7 +335,7 @@ core_target::clear_core ()
 
       /* Clear out solib state while the bfd is still open.  See
 	 comments in clear_solib in solib.c.  */
-      clear_solib ();
+      clear_solib (current_program_space);
 
       current_program_space->cbfd.reset (nullptr);
     }

gdb/solib.c

@@ -1180,23 +1180,23 @@ solib_keep_data_in_core (CORE_ADDR vaddr, unsigned long size)
     return false;
 }
 
-/* Called by free_all_symtabs */
+/* See solib.h.  */
 
 void
-clear_solib (void)
+clear_solib (program_space *pspace)
 {
   const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
 
-  disable_breakpoints_in_shlibs (current_program_space);
+  disable_breakpoints_in_shlibs (pspace);
 
-  current_program_space->so_list.clear_and_dispose ([] (solib *so) {
+  pspace->so_list.clear_and_dispose ([pspace] (solib *so) {
-    notify_solib_unloaded (current_program_space, *so);
+    notify_solib_unloaded (pspace, *so);
-    current_program_space->remove_target_sections (so);
+    pspace->remove_target_sections (so);
     delete so;
   });
 
   if (ops->clear_solib != nullptr)
-    ops->clear_solib (current_program_space);
+    ops->clear_solib (pspace);
 }
 
 /* Shared library startup support.  When GDB starts up the inferior,
@@ -1244,7 +1244,7 @@ no_shared_libraries (const char *ignored, int from_tty)
      access to their associated objfiles.  Therefore, we can not purge the
      solibs' objfiles before clear_solib has been called.  */
 
-  clear_solib ();
+  clear_solib (current_program_space);
   objfile_purge_solibs ();
 }
 

gdb/solib.h

@@ -42,10 +42,10 @@ extern bool debug_solib;
 #define SOLIB_SCOPED_DEBUG_START_END(fmt, ...) \
   scoped_debug_start_end (debug_solib, "solib", fmt, ##__VA_ARGS__)
 
-/* Called when we free all symtabs, to free the shared library information
+/* Called when we free all symtabs of PSPACE, to free the shared library
-   as well.  */
+   information as well.  */
 
-extern void clear_solib (void);
+extern void clear_solib (program_space *pspace);
 
 /* Called to add symbols from a shared library to gdb's symbol table.  */
 

gdb/symtab.h

@@ -2423,10 +2423,6 @@ extern bool find_line_pc_range (struct symtab_and_line, CORE_ADDR *,
 
 extern void resolve_sal_pc (struct symtab_and_line *);
 
-/* solib.c */
-
-extern void clear_solib (void);
-
 /* The reason we're calling into a completion match list collector
    function.  */
 enum class complete_symbol_mode