"Unused parameter" build failure(s) — clang 3.1

-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
PackageVersionSupposed error messageFull log Bug report
dancer-ircd 1.0.36-8channel.c:564:80: error: unused parameter 'was_kicked' [-Werror,-Wunused-parameter] Log
ifhp 3.5.20-12.1ifhp.c:1061:43: error: unused parameter 'infovar' [-Werror,-Wunused-parameter] Log
jffi 1.0.2-9 [exec] /«PKGBUILDDIR»/jni/jffi/Array.c:58:1: error: unused parameter 'env' [-Werror,-Wunused-parameter] Log
ruby-ffi 1.0.11debian-3.1libtest/Benchmark.c:27:22: error: unused parameter 'arg' [-Werror,-Wunused-parameter] Log
virtualbox 4.1.18-dfsg-1heapsimple.cpp:639:44: error: unused parameter 'hHeap' [-Werror,-Wunused-parameter] Log

5 errors