Cannot build with gcc 14

[crazy-max]

On alpine:latest (atm 3.21) it fails to build with the Dockerfile:

...
#8 [builder 2/4] RUN apk add --update --no-cache   make   gcc   musl-dev   linux-headers
#8 0.491 fetch https://dl-cdn.alpinelinux.org/alpine/v3.21/main/x86_64/APKINDEX.tar.gz
#8 0.595 fetch https://dl-cdn.alpinelinux.org/alpine/v3.21/community/x86_64/APKINDEX.tar.gz
#8 0.851 (1/15) Installing libgcc (14.2.0-r4)
#8 0.867 (2/15) Installing jansson (2.14-r4)
#8 0.877 (3/15) Installing libstdc++ (14.2.0-r4)
#8 0.906 (4/15) Installing zstd-libs (1.5.6-r2)
#8 0.923 (5/15) Installing binutils (2.43.1-r1)
#8 1.054 (6/15) Installing libgomp (14.2.0-r4)
#8 1.078 (7/15) Installing libatomic (14.2.0-r4)
#8 1.086 (8/15) Installing gmp (6.3.0-r2)
#8 1.102 (9/15) Installing isl26 (0.26-r1)
#8 1.147 (10/15) Installing mpfr4 (4.2.1-r0)
#8 1.164 (11/15) Installing mpc1 (1.3.1-r1)
#8 1.173 (12/15) Installing gcc (14.2.0-r4)
#8 2.641 (13/15) Installing linux-headers (6.6-r1)
#8 2.863 (14/15) Installing make (4.4.1-r2)
#8 2.880 (15/15) Installing musl-dev (1.2.5-r8)
#8 3.005 Executing busybox-1.37.0-r8.trigger
#8 3.029 OK: 176 MiB in 30 packages
#8 DONE 3.9s

#9 [builder 3/4] COPY * /root/
#9 DONE 0.1s

#10 [builder 4/4] RUN cd /root/ && make && find /root
#10 0.285 cc -Wall -Wextra -g -O0   -c -o wsdd2.o wsdd2.c
#10 0.313 wsdd2.c: In function 'open_ep':
#10 0.313 wsdd2.c:305:64: warning: 'calloc' sizes specified with 'sizeof' in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
#10 0.313   305 |         struct endpoint *ep = (struct endpoint *) calloc(sizeof(*ep), 1);
#10 0.313       |                                                                ^
#10 0.313 wsdd2.c:305:64: note: earlier argument should specify number of elements, later size of each element
#10 0.315 wsdd2.c: In function 'netlink_recv':
#10 0.315 wsdd2.c:546:56: error: initialization of 'int' from 'void *' makes integer from pointer without a cast [-Wint-conversion]
#10 0.315   546 |         struct msghdr msg = { &sa, sizeof sa, &iov, 1, NULL, 0, 0 };
#10 0.315       |                                                        ^~~~
#10 0.315 wsdd2.c:546:56: note: (near initialization for 'msg.__pad1')
#10 0.315 wsdd2.c:546:16: warning: missing initializer for field '__pad2' of 'struct msghdr' [-Wmissing-field-initializers]
#10 0.315   546 |         struct msghdr msg = { &sa, sizeof sa, &iov, 1, NULL, 0, 0 };
#10 0.315       |                ^~~~~~
#10 0.315 In file included from /usr/include/net/if.h:27,
#10 0.315                  from wsdd.h:27,
#10 0.315                  from wsdd2.c:25:
#10 0.315 /usr/include/sys/socket.h:39:13: note: '__pad2' declared here
#10 0.315    39 |         int __pad2;
#10 0.315       |             ^~~~~~
#10 0.326 make: *** [<builtin>: wsdd2.o] Error 1
#10 ERROR: process "/bin/sh -c cd /root/ && make && find /root" did not complete successfully: exit code: 2
------
 > [builder 4/4] RUN cd /root/ && make && find /root:
0.315 wsdd2.c:546:16: warning: missing initializer for field '__pad2' of 'struct msghdr' [-Wmissing-field-initializers]
0.315   546 |         struct msghdr msg = { &sa, sizeof sa, &iov, 1, NULL, 0, 0 };
0.315       |                ^~~~~~
0.315 In file included from /usr/include/net/if.h:27,
0.315                  from wsdd.h:27,
0.315                  from wsdd2.c:25:
0.315 /usr/include/sys/socket.h:39:13: note: '__pad2' declared here
0.315    39 |         int __pad2;
0.315       |             ^~~~~~
0.326 make: *** [<builtin>: wsdd2.o] Error 1
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