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diff --git a/lib/regcomp.c b/lib/regcomp.c
index d5968bd..4926676 100644
--- a/lib/regcomp.c
+++ b/lib/regcomp.c
@@ -541,7 +541,7 @@ regerror (errcode, preg, errbuf, errbuf_size)
size_t errbuf_size;
#else /* size_t might promote */
size_t
-regerror (int errcode, const regex_t *_Restrict_ preg,
+regerror (int errcode, const regex_t *_Restrict_ preg _UNUSED_PARAMETER_,
char *_Restrict_ errbuf, size_t errbuf_size)
#endif
{
@@ -1383,7 +1383,7 @@ calc_first (void *extra, bin_tree_t *node)
/* Pass 2: compute NEXT on the tree. Preorder visit. */
static reg_errcode_t
-calc_next (void *extra, bin_tree_t *node)
+calc_next (void *extra _UNUSED_PARAMETER_, bin_tree_t *node)
{
switch (node->token.type)
{
@@ -2744,7 +2744,8 @@ static reg_errcode_t
internal_function
build_collating_symbol (bitset_t sbcset,
# ifdef RE_ENABLE_I18N
- re_charset_t *mbcset, Idx *coll_sym_alloc,
+ re_charset_t *mbcset _UNUSED_PARAMETER_,
+ Idx *coll_sym_alloc _UNUSED_PARAMETER_,
# endif
const unsigned char *name)
{
@@ -3323,7 +3324,8 @@ parse_bracket_exp (re_string_t *regexp, re_dfa_t *dfa, re_token_t *token,
static reg_errcode_t
parse_bracket_element (bracket_elem_t *elem, re_string_t *regexp,
- re_token_t *token, int token_len, re_dfa_t *dfa,
+ re_token_t *token, int token_len,
+ re_dfa_t *dfa _UNUSED_PARAMETER_,
reg_syntax_t syntax, bool accept_hyphen)
{
#ifdef RE_ENABLE_I18N
@@ -3410,8 +3412,9 @@ parse_bracket_symbol (bracket_elem_t *elem, re_string_t *regexp,
static reg_errcode_t
#ifdef RE_ENABLE_I18N
-build_equiv_class (bitset_t sbcset, re_charset_t *mbcset,
- Idx *equiv_class_alloc, const unsigned char *name)
+build_equiv_class (bitset_t sbcset, re_charset_t *mbcset _UNUSED_PARAMETER_,
+ Idx *equiv_class_alloc _UNUSED_PARAMETER_,
+ const unsigned char *name)
#else /* not RE_ENABLE_I18N */
build_equiv_class (bitset_t sbcset, const unsigned char *name)
#endif /* not RE_ENABLE_I18N */
@@ -3816,7 +3819,7 @@ free_token (re_token_t *node)
and its children. */
static reg_errcode_t
-free_tree (void *extra, bin_tree_t *node)
+free_tree (void *extra _UNUSED_PARAMETER_, bin_tree_t *node)
{
free_token (&node->token);
return REG_NOERROR;
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