diff -r f1e4c6dabfb4 -r 38ee262e8b94 src/cx/allocator.h
--- a/src/cx/allocator.h	Sun Sep 26 17:58:27 2021 +0200
+++ b/src/cx/allocator.h	Sun Sep 26 18:01:51 2021 +0200
@@ -118,6 +118,7 @@
  * @param n the number of bytes
  * @return a pointer to the allocated memory
  */
+__attribute__ ((malloc))
 void *cxMalloc(CxAllocator allocator, size_t n);
 
 /**
@@ -149,6 +150,7 @@
  * @param n the new size in bytes
  * @return zero on success, non-zero on failure
  */
+__attribute__ ((nonnull))
 int cxReallocate(CxAllocator allocator, void **mem, size_t n);
 
 /**
@@ -159,6 +161,7 @@
  * @param n the size of each element in bytes
  * @return a pointer to the allocated memory
  */
+__attribute__ ((malloc))
 void *cxCalloc(CxAllocator allocator, size_t nelem, size_t n);
 
 /**
@@ -169,6 +172,7 @@
  * @param allocator the allocator
  * @param mem a pointer to the block to free
  */
+__attribute__((nonnull))
 void cxFree(CxAllocator allocator, void *mem);
 
 #ifdef __cplusplus