diff -r db06dda7ac4d -r a10c3e127050 src/cx/allocator.h
--- a/src/cx/allocator.h	Sun Oct 03 12:04:27 2021 +0200
+++ b/src/cx/allocator.h	Sun Oct 03 13:07:48 2021 +0200
@@ -121,7 +121,7 @@
  * @return a pointer to the allocated memory
  */
 void *cxMalloc(CxAllocator allocator, size_t n)
-__attribute__((__malloc__));
+__attribute__((__malloc__, __alloc_size__(2)));
 
 /**
  * Re-allocate the previously allocated block in \p mem, making the new block \p n bytes long.
@@ -136,7 +136,7 @@
  * @return a pointer to the re-allocated memory
  */
 void *cxRealloc(CxAllocator allocator, void *mem, size_t n)
-__attribute__((warn_unused_result));
+__attribute__((__warn_unused_result__, __alloc_size__(3)));
 
 /**
  * Re-allocate a previously allocated block and changes the pointer in-place, if necessary.
@@ -154,7 +154,7 @@
  * @return zero on success, non-zero on failure
  */
 int cxReallocate(CxAllocator allocator, void **mem, size_t n)
-__attribute__((nonnull));
+__attribute__((__nonnull__));
 
 /**
  * Allocate \p nelem elements of \p n bytes each, all initialized to zero.
@@ -165,7 +165,7 @@
  * @return a pointer to the allocated memory
  */
 void *cxCalloc(CxAllocator allocator, size_t nelem, size_t n)
-__attribute__((malloc));
+__attribute__((__malloc__, __alloc_size__(2, 3)));
 
 /**
  * Free a block allocated by this allocator.
@@ -176,7 +176,7 @@
  * @param mem a pointer to the block to free
  */
 void cxFree(CxAllocator allocator, void *mem)
-__attribute__((nonnull));
+__attribute__((__nonnull__));
 
 #ifdef __cplusplus
 } /* extern "C" */