Empty body declaration - Rebuild of the Debian archive with clang

"Empty body declaration" build failure(s) — clang 2.9

-Wempty-body warning is enabled by default which is not the case with gcc.
So, the following code will fail with clang but build with gcc:

int main() {
    if (1);
}

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

Package	Version	Supposed error message	Full log	Bug report
network-manager-strongswan	1.1.2-2	main.c:235:41: error: if statement has empty body [-Werror,-Wempty-body]	Log

1 errors