diff --git a/gcc/fortran/decl.c b/gcc/fortran/decl.c
index 2788348d1be..e9e23fe1acb 100644
--- a/gcc/fortran/decl.c
+++ b/gcc/fortran/decl.c
@@ -3713,7 +3713,7 @@ insert_parameter_exprs (gfc_expr* e, gfc_symbol* sym ATTRIBUTE_UNUSED,
 }
 
 
-bool
+static bool
 gfc_insert_kind_parameter_exprs (gfc_expr *e)
 {
   return gfc_traverse_expr (e, NULL, &insert_parameter_exprs, 0);
diff --git a/gcc/fortran/expr.c b/gcc/fortran/expr.c
index 4dea840e348..087d822021a 100644
--- a/gcc/fortran/expr.c
+++ b/gcc/fortran/expr.c
@@ -4587,21 +4587,12 @@ gfc_check_assign_symbol (gfc_symbol *sym, gfc_component *comp, gfc_expr *rvalue)
   return true;
 }
 
-/* Invoke gfc_build_init_expr to create an initializer expression, but do not
- * require that an expression be built.  */
-
-gfc_expr *
-gfc_build_default_init_expr (gfc_typespec *ts, locus *where)
-{
-  return gfc_build_init_expr (ts, where, false);
-}
-
 /* Build an initializer for a local integer, real, complex, logical, or
    character variable, based on the command line flags finit-local-zero,
    finit-integer=, finit-real=, finit-logical=, and finit-character=.
    With force, an initializer is ALWAYS generated.  */
 
-gfc_expr *
+static gfc_expr *
 gfc_build_init_expr (gfc_typespec *ts, locus *where, bool force)
 {
   gfc_expr *init_expr;
@@ -4758,6 +4749,15 @@ gfc_build_init_expr (gfc_typespec *ts, locus *where, bool force)
   return init_expr;
 }
 
+/* Invoke gfc_build_init_expr to create an initializer expression, but do not
+ * require that an expression be built.  */
+
+gfc_expr *
+gfc_build_default_init_expr (gfc_typespec *ts, locus *where)
+{
+  return gfc_build_init_expr (ts, where, false);
+}
+
 /* Apply an initialization expression to a typespec. Can be used for symbols or
    components. Similar to add_init_expr_to_sym in decl.c; could probably be
    combined with some effort.  */
diff --git a/gcc/fortran/gfortran.h b/gcc/fortran/gfortran.h
index f7662c59a5d..8c11cf6d18d 100644
--- a/gcc/fortran/gfortran.h
+++ b/gcc/fortran/gfortran.h
@@ -3116,7 +3116,6 @@ struct gfc_vect_builtin_tuple
 extern hash_map<nofree_string_hash, int> *gfc_vectorized_builtins;
 
 /* Handling Parameterized Derived Types  */
-bool gfc_insert_kind_parameter_exprs (gfc_expr *);
 bool gfc_insert_parameter_exprs (gfc_expr *, gfc_actual_arglist *);
 match gfc_get_pdt_instance (gfc_actual_arglist *, gfc_symbol **,
 			    gfc_actual_arglist **);
@@ -3348,11 +3347,9 @@ bool gfc_add_threadprivate (symbol_attribute *, const char *, locus *);
 bool gfc_add_omp_declare_target (symbol_attribute *, const char *, locus *);
 bool gfc_add_omp_declare_target_link (symbol_attribute *, const char *,
 				      locus *);
-bool gfc_add_saved_common (symbol_attribute *, locus *);
 bool gfc_add_target (symbol_attribute *, locus *);
 bool gfc_add_dummy (symbol_attribute *, const char *, locus *);
 bool gfc_add_generic (symbol_attribute *, const char *, locus *);
-bool gfc_add_common (symbol_attribute *, locus *);
 bool gfc_add_in_common (symbol_attribute *, const char *, locus *);
 bool gfc_add_in_equivalence (symbol_attribute *, const char *, locus *);
 bool gfc_add_data (symbol_attribute *, const char *, locus *);
@@ -3387,7 +3384,6 @@ bool gfc_copy_attr (symbol_attribute *, symbol_attribute *, locus *);
 int gfc_copy_dummy_sym (gfc_symbol **, gfc_symbol *, int);
 bool gfc_add_component (gfc_symbol *, const char *, gfc_component **);
 gfc_symbol *gfc_use_derived (gfc_symbol *);
-gfc_symtree *gfc_use_derived_tree (gfc_symtree *);
 gfc_component *gfc_find_component (gfc_symbol *, const char *, bool, bool,
                                    gfc_ref **);
 
@@ -3428,7 +3424,6 @@ void gfc_undo_symbols (void);
 void gfc_commit_symbols (void);
 void gfc_commit_symbol (gfc_symbol *);
 gfc_charlen *gfc_new_charlen (gfc_namespace *, gfc_charlen *);
-void gfc_free_charlen (gfc_charlen *, gfc_charlen *);
 void gfc_free_namespace (gfc_namespace *);
 
 void gfc_symbol_init_2 (void);
@@ -3448,7 +3443,6 @@ void gfc_traverse_gsymbol (gfc_gsymbol *, void (*)(gfc_gsymbol *, void *), void
 
 gfc_typebound_proc* gfc_get_typebound_proc (gfc_typebound_proc*);
 gfc_symbol* gfc_get_derived_super_type (gfc_symbol*);
-gfc_symbol* gfc_get_ultimate_derived_super_type (gfc_symbol*);
 bool gfc_type_is_extension_of (gfc_symbol *, gfc_symbol *);
 bool gfc_type_compatible (gfc_typespec *, gfc_typespec *);
 
@@ -3542,7 +3536,6 @@ void gfc_omp_restore_state (struct gfc_omp_saved_state *);
 void gfc_free_expr_list (gfc_expr_list *);
 void gfc_resolve_oacc_directive (gfc_code *, gfc_namespace *);
 void gfc_resolve_oacc_declare (gfc_namespace *);
-void gfc_resolve_oacc_parallel_loop_blocks (gfc_code *, gfc_namespace *);
 void gfc_resolve_oacc_blocks (gfc_code *, gfc_namespace *);
 void gfc_resolve_oacc_routines (gfc_namespace *);
 
@@ -3599,7 +3592,6 @@ bool gfc_check_pointer_assign (gfc_expr *lvalue, gfc_expr *rvalue,
 bool gfc_check_assign_symbol (gfc_symbol *, gfc_component *, gfc_expr *);
 
 gfc_expr *gfc_build_default_init_expr (gfc_typespec *, locus *);
-gfc_expr *gfc_build_init_expr (gfc_typespec *, locus *, bool);
 void gfc_apply_init (gfc_typespec *, symbol_attribute *, gfc_expr *);
 bool gfc_has_default_initializer (gfc_symbol *);
 gfc_expr *gfc_default_initializer (gfc_typespec *);
@@ -3665,7 +3657,6 @@ bool gfc_resolve_dim_arg (gfc_expr *);
 bool gfc_is_formal_arg (void);
 bool gfc_resolve_substring (gfc_ref *, bool *);
 void gfc_resolve_substring_charlen (gfc_expr *);
-match gfc_iso_c_sub_interface(gfc_code *, gfc_symbol *);
 gfc_expr *gfc_expr_to_initialize (gfc_expr *);
 bool gfc_type_is_extensible (gfc_symbol *);
 bool gfc_resolve_intrinsic (gfc_symbol *, locus *);
diff --git a/gcc/fortran/symbol.c b/gcc/fortran/symbol.c
index c77f3f84962..136a96ac87d 100644
--- a/gcc/fortran/symbol.c
+++ b/gcc/fortran/symbol.c
@@ -3985,7 +3985,7 @@ gfc_new_charlen (gfc_namespace *ns, gfc_charlen *old_cl)
 /* Free the charlen list from cl to end (end is not freed).
    Free the whole list if end is NULL.  */
 
-void
+static void
 gfc_free_charlen (gfc_charlen *cl, gfc_charlen *end)
 {
   gfc_charlen *cl2;
@@ -5108,7 +5108,7 @@ gfc_get_derived_super_type (gfc_symbol* derived)
 
 /* Get the ultimate super-type of a given derived type.  */
 
-gfc_symbol*
+static gfc_symbol*
 gfc_get_ultimate_derived_super_type (gfc_symbol* derived)
 {
   if (!derived->attr.extension)
