"Expression result unused" build failure(s) — clang 3.2

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
binutils 2.22-7.1../../bfd/opncls.c:256:5: error: expression result unused [-Werror,-Wunused-value] Log
binutils-mingw-w64 2../../../upstream/bfd/opncls.c:256:5: error: expression result unused [-Werror,-Wunused-value] Log
binutils-msp430 2.22~msp20120406-2opncls.c:249:5: error: expression result unused [-Werror,-Wunused-value] Log
binutils-z80 2.22-3opncls.c:256:5: error: expression result unused [-Werror,-Wunused-value] Log
gdb 7.4.1+dfsg-0.1opncls.c:249:5: 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

6 errors