Add new function to access gdb_program_name.

https://sourceware.org/ml/gdb-patches/2013-09/msg00225.html

gdb/ChangeLog

        * main.h (get_gdb_program_name): Add declaration.
        * main.c (get_gdb_program_name): Add definition.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2013-09-18  Andrew Burgess  <aburgess@broadcom.com>
+
+	* main.h (get_gdb_program_name): Add declaration.
+	* main.c (get_gdb_program_name): Add definition.
+
 2013-09-17  Doug Evans  <dje@google.com>
 
 	* dwarf2read.c: Move definitions of complaint functions to after

gdb/main.c

@@ -98,6 +98,13 @@ int return_child_result_value = -1;
 /* GDB as it has been invoked from the command line (i.e. argv[0]).  */
 static char *gdb_program_name;
 
+/* Return read only pointer to GDB_PROGRAM_NAME.  */
+const char *
+get_gdb_program_name (void)
+{
+  return gdb_program_name;
+}
+
 static void print_gdb_help (struct ui_file *);
 
 /* Relocate a file or directory.  PROGNAME is the name by which gdb

gdb/main.h

@@ -42,4 +42,10 @@ extern int batch_flag;
    return value is in malloc'ed storage.  */
 extern char *windows_get_absolute_argv0 (const char *argv0);
 
+/* Return read only pointer to the name of gdb as it was invoked.  This
+   might have been expanded to an absolute path if required by the
+   platform.  Could return NULL if called before gdb has had a chance to
+   parse the argv array.  */
+extern const char * get_gdb_program_name (void);
+
 #endif