[Bug c/117809] New: feature request: attribute malloc but for non-function-return-value return values

[felix-gcc at fefe dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117809

            Bug ID: 117809
           Summary: feature request: attribute malloc but for
                    non-function-return-value return values
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: felix-gcc at fefe dot de
  Target Milestone: ---

I love attribute malloc! I would like to annotate all my functions with it
where applicable!

But you can only do it for functions that return the malloced memory as return
value from the function. What about this type of function:

errno_t my_malloc(void** ptr, size_t len);

I'd love to add something like this:

__attribute__((malloc2(1,my_free,2)))
errno_t my_malloc(void** ptr, size_t len);



Here is a more real-world example, from the GNUNET interface to jansson (json
lib):

struct GNUNET_JSON_Specification
GNUNET_JSON_spec_json (const char *name,
                       json_t **jsonp);

I'd like to be able to annotate the second argument.