[PROBLEM] all warnings being treated as errors when I try to compile ext4 subtree

[Max <linmaxi@gmail.com>]

I have cloned the ext4 subtree: git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git
Then I tried to build it, first by making a .config file, and then running make.
The make won't finish beacuse I am getting this "all warnings being treated as errors":

In file included from help.c:12:
subcmd-util.h: In function ‘xrealloc’:
subcmd-util.h:58:31: error: pointer ‘ptr’ may be used after ‘realloc’ [-Werror=use-after-free]
   58 |                         ret = realloc(ptr, 1);
      |                               ^~~~~~~~~~~~~~~
subcmd-util.h:52:21: note: call to ‘realloc’ here
   52 |         void *ret = realloc(ptr, size);
      |                     ^~~~~~~~~~~~~~~~~~
subcmd-util.h:56:23: error: pointer ‘ptr’ may be used after ‘realloc’ [-Werror=use-after-free]
   56 |                 ret = realloc(ptr, size);
      |                       ^~~~~~~~~~~~~~~~~~
subcmd-util.h:52:21: note: call to ‘realloc’ here
   52 |         void *ret = realloc(ptr, size);
      |                     ^~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[5]: *** [/home/max/kernels/ext4/tools/build/Makefile.build:97: /home/max/kernels/build_ext4/tools/objtool/help.o] Error 1

Worth mentioning that trying to 'make' the mainline tree works fine.
I have tried adding the -Wno-error flag but it didnt work and anyway I think I shouldn't attempt changing it at all in order to build.

I would appreciate any help, I am a newbie, and I'd like to help fixing some bugs.