Fix some compiler warnings.

source/modes/drun.c

@@ -1082,7 +1082,7 @@ static void get_apps(DRunModePrivateData *pd) {
   g_free(cache_file);
 }
 
-static void drun_mode_parse_entry_fields() {
+static void drun_mode_parse_entry_fields(void) {
   char *savept = NULL;
   // Make a copy, as strtok will modify it.
   char *switcher_str = g_strdup(config.drun_match_fields);
@@ -1118,7 +1118,7 @@ static void drun_mode_parse_entry_fields() {
   g_free(switcher_str);
 }
 
-static void drun_mode_parse_display_format() {
+static void drun_mode_parse_display_format(void) {
   for (int i = 0; i < DRUN_MATCH_NUM_FIELDS; i++) {
     if (matching_entry_fields[i].enabled_display)
       continue;

source/theme.c

@@ -29,7 +29,6 @@
 #define G_LOG_DOMAIN "Theme"
 
 #include "config.h"
-#include <errno.h>
 #include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -599,11 +598,6 @@ void rofi_theme_print(ThemeWidget *widget) {
   }
 }
 
-/**
- * Main lex parser.
- */
-int yyparse();
-
 /**
  * Destroy the internal of lex parser.
  */

source/view.c

@@ -215,7 +215,7 @@ static int lev_sort(const void *p1, const void *p2, void *arg) {
 /**
  * Stores a screenshot of Rofi at that point in time.
  */
-void rofi_capture_screenshot() {
+void rofi_capture_screenshot(void) {
   RofiViewState *state = current_active_menu;
   if (state == NULL || state->main_window == NULL) {
     g_warning("Nothing to screenshot.");
@@ -1597,7 +1597,7 @@ void rofi_view_finalize(RofiViewState *state) {
  * This function should be called when the input of the entry is changed.
  * TODO: Evaluate if this needs to be a 'signal' on textbox?
  */
-static void rofi_view_input_changed() {
+static void rofi_view_input_changed(void) {
   rofi_view_take_action("inputchange");
 
   RofiViewState *state = current_active_menu;
@@ -2591,7 +2591,7 @@ void rofi_view_hide(void) {
   }
 }
 
-void rofi_view_cleanup() {
+void rofi_view_cleanup(void) {
   // Clear clipboard data.
   xcb_stuff_set_clipboard(NULL);
   g_debug("Cleanup.");

source/xcb.c

@@ -558,7 +558,7 @@ static int x11_is_extension_present(const char *extension) {
   return present;
 }
 
-static void x11_build_monitor_layout_xinerama() {
+static void x11_build_monitor_layout_xinerama(void) {
   xcb_xinerama_query_screens_cookie_t screens_cookie =
       xcb_xinerama_query_screens_unchecked(xcb->connection);
 
@@ -589,7 +589,7 @@ static void x11_build_monitor_layout_xinerama() {
   free(screens_reply);
 }
 
-static void x11_build_monitor_layout() {
+static void x11_build_monitor_layout(void) {
   if (xcb->monitors) {
     return;
   }

test/textbox-test.c

@@ -79,7 +79,7 @@ gboolean config_parse_set_property(G_GNUC_UNUSED const Property *p,
 
 void rofi_add_error_message(G_GNUC_UNUSED GString *msg) {}
 void rofi_add_warning_message(G_GNUC_UNUSED GString *msg) {}
-void rofi_view_queue_redraw() {}
+void rofi_view_queue_redraw(void) {}
 void rofi_view_get_current_monitor(G_GNUC_UNUSED int *width,
                                    G_GNUC_UNUSED int *height) {}
 int rofi_view_error_dialog(const char *msg, G_GNUC_UNUSED int markup) {