"Expression result unused" build failure(s) — clang 2.9

clang triggers a warning on this useless usage of the define. The -Werror causes the failure.
#define bar(int) (1)

void foo() {
    bar(2);
}

With gcc, this warning is only displayed with -Wall.
PackageVersionSupposed error messageFull log Bug report
libwps 0.2.2-1WPS8.cpp:198:14: error: expression result unused [-Werror,-Wunused-value] Log
mdadm 3.1.4-1+8efb9d1util.c:1049:3: error: expression result unused [-Werror,-Wunused-value] Log
ngorca 1.0.2-2ngorca.c:173:14: error: expression result unused [-Werror,-Wunused-value] Log 740189

3 errors