Unused parameter - Rebuild of the Debian archive with clang

"Unused parameter" build failure(s) — clang 11.0.0

-Wextra of clang incluses -Wunused-parameter which is not the case with gcc.
So, the following code will fail with clang but build with gcc:

int main(int argc, char *argv[])
{
}

clang -Werror -Wextra -c plop.c
gcc -Werror -Wextra -c plop.c

Package	Version	Supposed error message	Full log	Bug report
ifhp	3.5.20-17	ifhp.c:1062:43: error: unused parameter 'infovar' [-Werror,-Wunused-parameter]	Log
switchsh	0~20070801-4	switchsh.c:69:14: error: unused parameter 'argc' [-Werror,-Wunused-parameter]	Log

2 errors