g++ cilk errors

g++-cilk-errors.log

In file included from ./fake_mutex.hpp:43:0,
                 from abort.cpp:24:
./fake_mutex.hpp: In member function ‘virtual void cilkscreen::fake_mutex::lock()’:
/afs/csail/proj/courses/6.172/cilkutil/include/cilktools/cilkscreen.h:40:75: error: left operand of comma operator has no effect [-Werror=unused-value]
 #  define __cilkscreen_metacall(annotation,expr) (annotation, (void) (expr))
                                                                           ^
/afs/csail/proj/courses/6.172/cilkutil/include/cilktools/cilkscreen.h:73:5: note: in expansion of macro '__cilkscreen_metacall'
     __cilkscreen_metacall("cilkscreen_acquire_lock", (lock))
     ^
./fake_mutex.hpp:57:7: note: in expansion of macro '__cilkscreen_acquire_lock'
       __cilkscreen_acquire_lock(&lock_val);
       ^
./fake_mutex.hpp: In member function ‘virtual void cilkscreen::fake_mutex::unlock()’:
/afs/csail/proj/courses/6.172/cilkutil/include/cilktools/cilkscreen.h:40:75: error: left operand of comma operator has no effect [-Werror=unused-value]
 #  define __cilkscreen_metacall(annotation,expr) (annotation, (void) (expr))
                                                                           ^
/afs/csail/proj/courses/6.172/cilkutil/include/cilktools/cilkscreen.h:76:5: note: in expansion of macro '__cilkscreen_metacall'
     __cilkscreen_metacall("cilkscreen_release_lock", (lock))
     ^
./fake_mutex.hpp:68:7: note: in expansion of macro '__cilkscreen_release_lock'
       __cilkscreen_release_lock(&lock_val);
       ^
cc1plus: all warnings being treated as errors
make: *** [abort.o] Error 1
"/afs/csail.mit.edu/proj/courses/6.172/gcc-cilkplus/bin/g++" -DDEBUG -O0 -std=c++11 -Wall -g -gdwarf-3 -fverbose-asm -I/afs/csail/proj/courses/6.172/cilkutil/include/ -ldl -lcilkrts -Wall -Werror -DDEBUG_VERBOSE=1 -Wall -Werror -DDEBUG_VERBOSE=1 -c abort.cpp -o abort.o
In file included from ./fake_mutex.hpp:43:0,
                 from abort.cpp:24:
./fake_mutex.hpp: In member function ‘virtual void cilkscreen::fake_mutex::lock()’:
/afs/csail/proj/courses/6.172/cilkutil/include/cilktools/cilkscreen.h:40:75: error: left operand of comma operator has no effect [-Werror=unused-value]
 #  define __cilkscreen_metacall(annotation,expr) (annotation, (void) (expr))
                                                                           ^
/afs/csail/proj/courses/6.172/cilkutil/include/cilktools/cilkscreen.h:73:5: note: in expansion of macro '__cilkscreen_metacall'
     __cilkscreen_metacall("cilkscreen_acquire_lock", (lock))
     ^
./fake_mutex.hpp:57:7: note: in expansion of macro '__cilkscreen_acquire_lock'
       __cilkscreen_acquire_lock(&lock_val);
       ^
./fake_mutex.hpp: In member function ‘virtual void cilkscreen::fake_mutex::unlock()’:
/afs/csail/proj/courses/6.172/cilkutil/include/cilktools/cilkscreen.h:40:75: error: left operand of comma operator has no effect [-Werror=unused-value]
 #  define __cilkscreen_metacall(annotation,expr) (annotation, (void) (expr))
                                                                           ^
/afs/csail/proj/courses/6.172/cilkutil/include/cilktools/cilkscreen.h:76:5: note: in expansion of macro '__cilkscreen_metacall'
     __cilkscreen_metacall("cilkscreen_release_lock", (lock))
     ^
./fake_mutex.hpp:68:7: note: in expansion of macro '__cilkscreen_release_lock'
       __cilkscreen_release_lock(&lock_val);
       ^
cc1plus: all warnings being treated as errors
make: *** [abort.o] Error 1