diff -r 68ad5750ba6b -r 7960298039cf src/allocator.c
--- a/src/allocator.c	Sun Oct 03 10:43:31 2021 +0200
+++ b/src/allocator.c	Sun Oct 03 12:02:57 2021 +0200
@@ -30,26 +30,27 @@
 
 #include <stdlib.h>
 
-__attribute__((malloc))
-void *cx_malloc_stdlib(__attribute__((unused)) void *d, size_t n) {
+__attribute__((__malloc__))
+static void *cx_malloc_stdlib(__attribute__((__unused__)) void *d, size_t n) {
     return malloc(n);
 }
 
-void *cx_realloc_stdlib(__attribute__((unused)) void *d, void *mem, size_t n) {
+__attribute__((__warn_unused_result__))
+static void *cx_realloc_stdlib(__attribute__((__unused__)) void *d, void *mem, size_t n) {
     return realloc(mem, n);
 }
 
-__attribute__((malloc))
-void *cx_calloc_stdlib(__attribute__((unused)) void *d, size_t nelem, size_t n) {
+__attribute__((__malloc__))
+static void *cx_calloc_stdlib(__attribute__((__unused__)) void *d, size_t nelem, size_t n) {
     return calloc(nelem, n);
 }
 
-__attribute__((nonnull))
-void cx_free_stdlib(__attribute__((unused)) void *d, void *mem) {
+__attribute__((__nonnull__))
+static void cx_free_stdlib(__attribute__((__unused__)) void *d, void *mem) {
     free(mem);
 }
 
-cx_allocator_class cx_default_allocator_class = {
+static cx_allocator_class cx_default_allocator_class = {
         cx_malloc_stdlib,
         cx_realloc_stdlib,
         cx_calloc_stdlib,
@@ -73,7 +74,7 @@
 }
 
 int cxReallocate(CxAllocator allocator, void **mem, size_t n) {
-    void* nmem = allocator->cl->realloc(allocator->data, *mem, n);
+    void *nmem = allocator->cl->realloc(allocator->data, *mem, n);
     if (nmem == NULL) {
         return 1;
     } else {