void gfc_conv_constant (gfc_se *, gfc_expr *);
tree gfc_build_string_const (int, const char *);
+tree gfc_build_wide_string_const (int, int, const gfc_char_t *);
tree gfc_build_cstring_const (const char *);
tree gfc_build_localized_cstring_const (const char *);