diff --git a/source/blender/blenfont/intern/blf_font_default.c b/source/blender/blenfont/intern/blf_font_default.c
index 63b1cf34db5..9a3bf1a3797 100644
--- a/source/blender/blenfont/intern/blf_font_default.c
+++ b/source/blender/blenfont/intern/blf_font_default.c
@@ -92,7 +92,7 @@ static void blf_load_datafiles_dir(void)
   BLI_filelist_free(file_list, file_list_num);
 }
 
-void BLF_load_font_stack()
+void BLF_load_font_stack(void)
 {
   /* Load these if not already, might have been replaced by user custom. */
   BLF_load_default(false);
diff --git a/source/blender/blenkernel/intern/main.c b/source/blender/blenkernel/intern/main.c
index a2c5f7a91af..6c5afa683fa 100644
--- a/source/blender/blenkernel/intern/main.c
+++ b/source/blender/blenkernel/intern/main.c
@@ -29,7 +29,7 @@
 #include "IMB_imbuf.h"
 #include "IMB_imbuf_types.h"
 
-Main *BKE_main_new()
+Main *BKE_main_new(void)
 {
   Main *bmain = MEM_callocN(sizeof(Main), "new main");
   bmain->lock = MEM_mallocN(sizeof(SpinLock), "main lock");
diff --git a/source/blender/blenkernel/intern/mask_rasterize.c b/source/blender/blenkernel/intern/mask_rasterize.c
index adc0eb5f78c..7b3792b7451 100644
--- a/source/blender/blenkernel/intern/mask_rasterize.c
+++ b/source/blender/blenkernel/intern/mask_rasterize.c
@@ -993,6 +993,7 @@ void BKE_maskrasterize_handle_init(MaskRasterHandle *mr_handle,
        * 'face_index' is kept from loop above */
 
       BLI_assert(face_index == sf_tri_tot);
+      UNUSED_VARS_NDEBUG(face_index);
 
       if (tot_feather_quads) {
         ScanFillEdge *sf_edge;
diff --git a/source/blender/blenkernel/intern/nla.c b/source/blender/blenkernel/intern/nla.c
index ab5fd55d43e..824eff7cc6b 100644
--- a/source/blender/blenkernel/intern/nla.c
+++ b/source/blender/blenkernel/intern/nla.c
@@ -336,7 +336,7 @@ void BKE_nla_tracks_copy_from_adt(Main *bmain,
 
 /* Adding ------------------------------------------- */
 
-NlaTrack *BKE_nlatrack_new()
+NlaTrack *BKE_nlatrack_new(void)
 {
   /* allocate new track */
   NlaTrack *nlt = MEM_callocN(sizeof(NlaTrack), "NlaTrack");
diff --git a/source/blender/blenlib/intern/BLI_timer.c b/source/blender/blenlib/intern/BLI_timer.c
index 8aa5521870f..5a33a19d702 100644
--- a/source/blender/blenlib/intern/BLI_timer.c
+++ b/source/blender/blenlib/intern/BLI_timer.c
@@ -114,13 +114,13 @@ static void remove_tagged_functions(void)
   }
 }
 
-void BLI_timer_execute()
+void BLI_timer_execute(void)
 {
   execute_functions_if_necessary();
   remove_tagged_functions();
 }
 
-void BLI_timer_free()
+void BLI_timer_free(void)
 {
   LISTBASE_FOREACH (TimedFunction *, timed_func, &GlobalTimer.funcs) {
     timed_func->tag_removal = true;
diff --git a/source/blender/draw/intern/draw_cache.c b/source/blender/draw/intern/draw_cache.c
index f954f548508..df6d4f59933 100644
--- a/source/blender/draw/intern/draw_cache.c
+++ b/source/blender/draw/intern/draw_cache.c
@@ -212,7 +212,7 @@ GPUBatch *drw_cache_procedural_triangles_get(void)
   return SHC.drw_procedural_tris;
 }
 
-GPUBatch *drw_cache_procedural_triangle_strips_get()
+GPUBatch *drw_cache_procedural_triangle_strips_get(void)
 {
   if (!SHC.drw_procedural_tri_strips) {
     /* TODO(fclem): get rid of this dummy VBO. */
diff --git a/source/blender/draw/intern/draw_instance_data.c b/source/blender/draw/intern/draw_instance_data.c
index bf4efa30785..6df28032cda 100644
--- a/source/blender/draw/intern/draw_instance_data.c
+++ b/source/blender/draw/intern/draw_instance_data.c
@@ -622,7 +622,7 @@ void drw_uniform_attrs_pool_update(GHash *table,
   }
 }
 
-GPUUniformBuf *drw_ensure_layer_attribute_buffer()
+GPUUniformBuf *drw_ensure_layer_attribute_buffer(void)
 {
   DRWData *data = DST.vmempool;
 
@@ -685,7 +685,7 @@ DRWSparseUniformBuf *DRW_uniform_attrs_pool_find_ubo(GHash *table,
   return buffer ? &buffer->ubos : NULL;
 }
 
-GHash *DRW_uniform_attrs_pool_new()
+GHash *DRW_uniform_attrs_pool_new(void)
 {
   return GPU_uniform_attr_list_hash_new("obattr_hash");
 }
diff --git a/source/blender/editors/space_nla/nla_ops.c b/source/blender/editors/space_nla/nla_ops.c
index 3ae73282230..49fadb426d8 100644
--- a/source/blender/editors/space_nla/nla_ops.c
+++ b/source/blender/editors/space_nla/nla_ops.c
@@ -140,7 +140,7 @@ void nla_operatortypes(void)
   WM_operatortype_append(NLA_OT_fmodifier_paste);
 }
 
-void ED_operatormacros_nla()
+void ED_operatormacros_nla(void)
 {
   wmOperatorType *ot;
   wmOperatorTypeMacro *otmacro;
diff --git a/source/blender/editors/space_view3d/view3d_cursor_snap.c b/source/blender/editors/space_view3d/view3d_cursor_snap.c
index bf32a509dd9..85d7ba9714b 100644
--- a/source/blender/editors/space_view3d/view3d_cursor_snap.c
+++ b/source/blender/editors/space_view3d/view3d_cursor_snap.c
@@ -1027,7 +1027,7 @@ void ED_view3d_cursor_snap_data_update(V3DSnapCursorState *state,
   }
 }
 
-V3DSnapCursorData *ED_view3d_cursor_snap_data_get()
+V3DSnapCursorData *ED_view3d_cursor_snap_data_get(void)
 {
   SnapCursorDataIntern *data_intern = &g_data_intern;
   return &data_intern->snap_data;
diff --git a/source/blender/imbuf/intern/colormanagement.c b/source/blender/imbuf/intern/colormanagement.c
index 344dccfe919..7e5098477a9 100644
--- a/source/blender/imbuf/intern/colormanagement.c
+++ b/source/blender/imbuf/intern/colormanagement.c
@@ -1416,7 +1416,7 @@ bool IMB_colormanagement_space_name_is_srgb(const char *name)
   return (colorspace && IMB_colormanagement_space_is_srgb(colorspace));
 }
 
-const float *IMB_colormanagement_get_xyz_to_scene_linear()
+const float *IMB_colormanagement_get_xyz_to_scene_linear(void)
 {
   return &imbuf_xyz_to_scene_linear[0][0];
 }
diff --git a/source/blender/python/generic/idprop_py_ui_api.c b/source/blender/python/generic/idprop_py_ui_api.c
index 78a328ab772..ad26fe273ed 100644
--- a/source/blender/python/generic/idprop_py_ui_api.c
+++ b/source/blender/python/generic/idprop_py_ui_api.c
@@ -822,7 +822,7 @@ PyTypeObject BPy_IDPropertyUIManager_Type = {
     /*tp_vectorcall*/ NULL,
 };
 
-void IDPropertyUIData_Init_Types()
+void IDPropertyUIData_Init_Types(void)
 {
   PyType_Ready(&BPy_IDPropertyUIManager_Type);
 }
diff --git a/source/blender/windowmanager/intern/wm_platform_support.c b/source/blender/windowmanager/intern/wm_platform_support.c
index ee93621545f..674cbe4ef8e 100644
--- a/source/blender/windowmanager/intern/wm_platform_support.c
+++ b/source/blender/windowmanager/intern/wm_platform_support.c
@@ -95,7 +95,7 @@ static void wm_platform_support_create_link(char *link)
   BLI_dynstr_free(ds);
 }
 
-bool WM_platform_support_perform_checks()
+bool WM_platform_support_perform_checks(void)
 {
   char title[WM_PLATFORM_SUPPORT_TEXT_SIZE];
   char message[WM_PLATFORM_SUPPORT_TEXT_SIZE];