Add missing default default_libc_has_fast_function implementation.

2019-05-20  Martin Liska  <mliska@suse.cz>

	* targhooks.c (default_libc_has_fast_function): New function.
	* targhooks.h (default_libc_has_fast_function): Likewise.

From-SVN: r271401

gcc/ChangeLog

 2019-05-20  Martin Liska  <mliska@suse.cz>
 
+	* targhooks.c (default_libc_has_fast_function): New function.
+	* targhooks.h (default_libc_has_fast_function): Likewise.
+
+2019-05-20  Martin Liska  <mliska@suse.cz>
+
 	PR middle-end/90263
 	* builtins.c (expand_builtin_memory_copy_args): When having a
 	target with fast mempcpy implementation do now use memcpy.

gcc/targhooks.c

@@ -1651,6 +1651,14 @@ default_libc_has_function (enum function_class fn_class)
   return false;
 }
 
+/* By default assume that libc has not a fast implementation.  */
+
+bool
+default_libc_has_fast_function (int fcode ATTRIBUTE_UNUSED)
+{
+  return false;
+}
+
 bool
 gnu_libc_has_function (enum function_class fn_class ATTRIBUTE_UNUSED)
 {

gcc/targhooks.h

@@ -205,6 +205,7 @@ extern unsigned int default_case_values_threshold (void);
 extern bool default_have_conditional_execution (void);
 
 extern bool default_libc_has_function (enum function_class);
+extern bool default_libc_has_fast_function (int fcode);
 extern bool no_c99_libc_has_function (enum function_class);
 extern bool gnu_libc_has_function (enum function_class);