[PATCH] Constify solib_name_from_address

[Tom Tromey via Gdb-patches <gdb-patches@sourceware.org>]

I noticed that solib_name_from_address returned a non-const string,
but it's more appropriate to return const.  This patch implements
this.  Tested by rebuilding.
---
 gdb/python/py-progspace.c | 3 +--
 gdb/solib.c               | 2 +-
 gdb/solib.h               | 2 +-
 gdb/stack.c               | 5 +++--
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/gdb/python/py-progspace.c b/gdb/python/py-progspace.c
index 5657ef7756c..a9abfb4c777 100644
--- a/gdb/python/py-progspace.c
+++ b/gdb/python/py-progspace.c
@@ -351,7 +351,6 @@ pspy_get_objfiles (PyObject *self_, PyObject *args)
 static PyObject *
 pspy_solib_name (PyObject *o, PyObject *args)
 {
-  char *soname;
   gdb_py_ulongest pc;
   pspace_object *self = (pspace_object *) o;
 
@@ -360,7 +359,7 @@ pspy_solib_name (PyObject *o, PyObject *args)
   if (!PyArg_ParseTuple (args, GDB_PY_LLU_ARG, &pc))
     return NULL;
 
-  soname = solib_name_from_address (self->pspace, pc);
+  const char *soname = solib_name_from_address (self->pspace, pc);
   if (soname == nullptr)
     Py_RETURN_NONE;
   return host_string_to_python_string (soname).release ();
diff --git a/gdb/solib.c b/gdb/solib.c
index 0fbf5bc988d..7d4734b0012 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -1225,7 +1225,7 @@ solib_contains_address_p (const struct so_list *const solib,
    breakpoints which are in shared libraries that are not currently
    mapped in.  */
 
-char *
+const char *
 solib_name_from_address (struct program_space *pspace, CORE_ADDR address)
 {
   struct so_list *so = NULL;
diff --git a/gdb/solib.h b/gdb/solib.h
index f9b4d3566d7..251028472c0 100644
--- a/gdb/solib.h
+++ b/gdb/solib.h
@@ -48,7 +48,7 @@ extern void solib_create_inferior_hook (int from_tty);
 
 /* If ADDR lies in a shared library, return its name.  */
 
-extern char *solib_name_from_address (struct program_space *, CORE_ADDR);
+extern const char *solib_name_from_address (struct program_space *, CORE_ADDR);
 
 /* Return true if ADDR lies within SOLIB.  */
 
diff --git a/gdb/stack.c b/gdb/stack.c
index 71d85985d18..80801ccdb01 100644
--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -1427,8 +1427,9 @@ print_frame (const frame_print_options &fp_opts,
     if (print_what != SHORT_LOCATION
 	&& pc_p && (funname == NULL || sal.symtab == NULL))
       {
-	char *lib = solib_name_from_address (get_frame_program_space (frame),
-					     get_frame_pc (frame));
+	const char *lib
+	  = solib_name_from_address (get_frame_program_space (frame),
+				     get_frame_pc (frame));
 
 	if (lib)
 	  {
-- 
2.34.1