New subject: [kamailio/kamailio] tls module cannot be build with -DTLS_MALLOC_DBG=1 since a long time (Issue #3532)

8 Aug 2023

### Description
I want debug memory usage by TLS module.
To do this used command
```
make -C src/modules/tls CFLAGS="-DTLS_MALLOC_DBG=1"
```
And this output
```
[root@sbc-stage-a0 kamailio]# make -C src/modules/tls
CFLAGS="-DTLS_MALLOC_DBG=1" 
make: Entering directory '/root/bak/kamailio/src/modules/tls'
CC (gcc) [M tls.so]		tls_domain.o
CC (gcc) [M tls.so]		tls_rand.o
CC (gcc) [M tls.so]		tls_map.o
CC (gcc) [M tls.so]		tls_cfg.o
CC (gcc) [M tls.so]		tls_mod.o
CC (gcc) [M tls.so]		tls_util.o
CC (gcc) [M tls.so]		tls_config.o
CC (gcc) [M tls.so]		tls_server.o
CC (gcc) [M tls.so]		tls_select.o
CC (gcc) [M tls.so]		tls_dump_vf.o
CC (gcc) [M tls.so]		tls_init.o
tls_init.c:137:2: warning: #warning "tls module compiled with malloc debugging info
(extra overhead)" [-Wcpp]
 #warning "tls module compiled with malloc debugging info (extra overhead)"
  ^~~~~~~
tls_init.c: In function ‘ser_malloc’:
tls_init.c:218:5: warning: implicit declaration of function ‘_shm_malloc’; did you mean
‘shm_malloc’? [-Wimplicit-function-declaration]
   p=_shm_malloc(size+s, file, "via ser_malloc", line);
     ^~~~~~~~~~~
     shm_malloc
tls_init.c:218:4: warning: assignment to ‘void *’ from ‘int’ makes pointer from integer
without a cast [-Wint-conversion]
   p=_shm_malloc(size+s, file, "via ser_malloc", line);
    ^
tls_init.c:224:39: error: invalid application of ‘sizeof’ to incomplete type ‘struct
qm_frag’
    ((struct qm_frag*)((char*)p-sizeof(struct qm_frag)))->func=
                                       ^~~~~~
tls_init.c: In function ‘ser_realloc’:
tls_init.c:253:5: warning: implicit declaration of function ‘_shm_realloc’; did you mean
‘shm_realloc’? [-Wimplicit-function-declaration]
   p=_shm_realloc(ptr, size+s, file, "via ser_realloc", line);
     ^~~~~~~~~~~~
     shm_realloc
tls_init.c:253:4: warning: assignment to ‘void *’ from ‘int’ makes pointer from integer
without a cast [-Wint-conversion]
   p=_shm_realloc(ptr, size+s, file, "via ser_realloc", line);
    ^
tls_init.c:259:39: error: invalid application of ‘sizeof’ to incomplete type ‘struct
qm_frag’
    ((struct qm_frag*)((char*)p-sizeof(struct qm_frag)))->func=
                                       ^~~~~~
tls_init.c: In function ‘tls_pre_init’:
tls_init.c:684:7: warning: implicit declaration of function ‘CRYPTO_set_mem_ex_functions’;
did you mean ‘CRYPTO_set_mem_functions’? [-Wimplicit-function-declaration]
  if (!CRYPTO_set_mem_ex_functions(ser_malloc, ser_realloc, ser_free)) {
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~
       CRYPTO_set_mem_functions
tls_init.c:684:60: error: ‘ser_free’ undeclared (first use in this function); did you mean
‘sk_free’?
  if (!CRYPTO_set_mem_ex_functions(ser_malloc, ser_realloc, ser_free)) {
                                                            ^~~~~~~~
                                                            sk_free
tls_init.c:684:60: note: each undeclared identifier is reported only once for each
function it appears in
make: *** [../../Makefile.rules:100: tls_init.o] Error 1
make: Leaving directory '/root/bak/kamailio/src/modules/tls'
```

### Additional Information
kamailio 5.6.4 with some customisation

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[kamailio/kamailio] cannot build with -DTLS_MALLOC_DBG=1 (Issue #3532)