cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration wchar/swscanf.c -o wchar/swscanf -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
wchar/swscanf.c: In function ‘main’:
wchar/swscanf.c:11:19: error: implicit declaration of function ‘swscanf’; did you mean ‘sscanf’? [-Wimplicit-function-declaration]
   11 |         int ret = swscanf(L"hello world 42", L"hello %5ls %d", world, &value);
      |                   ^~~~~~~
      |                   sscanf