Reduce dependency on gnulib by requiring C99 and POSIX 2008

- Remove gnulib modules c99, getopt-posix, strdup-posix, ssize_t
- Also remove obsolete gnulib module snippet/unused-parameter, use
  _GL_UNUSED instead of older _GL_UNUSED_PARAMETER, and instead of
  [[maybe_unused]].

Thanks to @dimztimz for providing the patch on which this commit is based.

3 files changed, 15 insertions, 18 deletions

diff --git a/src/enchant-lsmod.c b/src/enchant-lsmod.c
index 22c5560..737ca7a 100644
--- a/src/enchant-lsmod.c
+++ b/src/enchant-lsmod.c
@@ -34,7 +34,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "unused-parameter.h"
 
 #include "enchant.h"
 #include "enchant-provider.h"
@@ -42,18 +41,18 @@
 static void
 describe_dict (const char * const lang_tag,
 	       const char * const provider_name,
-	       const char * const provider_desc _GL_UNUSED_PARAMETER,
-	       const char * const provider_file _GL_UNUSED_PARAMETER,
-	       void * user_data _GL_UNUSED_PARAMETER)
+	       const char * const provider_desc _GL_UNUSED,
+	       const char * const provider_file _GL_UNUSED,
+	       void * user_data _GL_UNUSED)
 {
 	printf ("%s (%s)\n", lang_tag, provider_name);
 }
 
 static void
-describe_word_chars (const char * const lang_tag _GL_UNUSED_PARAMETER,
-		     const char * const provider_name _GL_UNUSED_PARAMETER,
-		     const char * const provider_desc _GL_UNUSED_PARAMETER,
-		     const char * const provider_file _GL_UNUSED_PARAMETER,
+describe_word_chars (const char * const lang_tag _GL_UNUSED,
+		     const char * const provider_name _GL_UNUSED,
+		     const char * const provider_desc _GL_UNUSED,
+		     const char * const provider_file _GL_UNUSED,
 		     void * user_data)
 {
 	EnchantDict *dict = (EnchantDict *)user_data;
@@ -66,8 +65,8 @@ describe_word_chars (const char * const lang_tag _GL_UNUSED_PARAMETER,
 static void
 describe_provider (const char * name,
 		   const char * desc,
-		   const char * file _GL_UNUSED_PARAMETER,
-		   void * user_data _GL_UNUSED_PARAMETER)
+		   const char * file _GL_UNUSED,
+		   void * user_data _GL_UNUSED)
 {
 	printf ("%s (%s)\n", name, desc);
 }
diff --git a/src/lib.c b/src/lib.c
index 14da76a..d9d3c54 100644
--- a/src/lib.c
+++ b/src/lib.c
@@ -48,7 +48,6 @@
 #include "enchant-provider.h"
 #include "debug.h"
 #include "pwl.h"
-#include "unused-parameter.h"
 #include "relocatable.h"
 #include "configmake.h"
 
@@ -162,7 +161,7 @@ enchant_get_conf_dirs (void)
 /* returns TRUE if tag is valid
  * for requires alphanumeric ASCII or underscore
  */
-static _GL_ATTRIBUTE_PURE int
+static G_GNUC_PURE int
 enchant_is_valid_dictionary_tag(const char * const tag)
 {
 	const char * it;
@@ -1300,7 +1299,7 @@ enchant_broker_dict_exists (EnchantBroker * broker, const char * const tag)
 	return exists;
 }
 
-_GL_ATTRIBUTE_PURE const char *
+G_GNUC_PURE const char *
 enchant_dict_get_extra_word_characters (EnchantDict *dict)
 {
 	g_return_val_if_fail (dict, NULL);
@@ -1308,7 +1307,7 @@ enchant_dict_get_extra_word_characters (EnchantDict *dict)
 	return dict->get_extra_word_characters ? (*dict->get_extra_word_characters) (dict) : "";
 }
 
-_GL_ATTRIBUTE_PURE int
+G_GNUC_PURE int
 enchant_dict_is_word_character (EnchantDict * dict, uint32_t uc_in, size_t n)
 {
 	g_return_val_if_fail (n <= 2, 0);
diff --git a/src/pwl.c b/src/pwl.c
index f6d8df5..8d3fbb5 100644
--- a/src/pwl.c
+++ b/src/pwl.c
@@ -65,7 +65,6 @@
 #include <glib.h>
 #include <glib/gstdio.h>
 #include "enchant-provider.h"
-#include "unused-parameter.h"
 
 #include "pwl.h"
 
@@ -494,7 +493,7 @@ static int enchant_is_all_caps(const char*const word, size_t len)
 	return hasCap;
 }
 
-static _GL_ATTRIBUTE_PURE int enchant_is_title_case(const char * const word, size_t len)
+static G_GNUC_PURE int enchant_is_title_case(const char * const word, size_t len)
 {
 	g_return_val_if_fail (word && *word, 0);
 
@@ -708,9 +707,9 @@ static void enchant_trie_free(EnchantTrie* trie)
 	g_free(trie);
 }
 
-static void enchant_trie_free_cb(void* key _GL_UNUSED_PARAMETER,
+static void enchant_trie_free_cb(void* key _GL_UNUSED,
 				 void* value,
-				 void* data _GL_UNUSED_PARAMETER)
+				 void* data _GL_UNUSED)
 {
 	enchant_trie_free((EnchantTrie*) value);
 }