In file included from /home/prathamesh.kulkarni/gcc/stage1-c-cxx-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/future:44:0,
                 from /home/prathamesh.kulkarni/gcc/src/libstdc++-v3/include/precompiled/stdc++.h:104:
/home/prathamesh.kulkarni/gcc/stage1-c-cxx-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/atomic_futex.h: In member function ‘unsigned int std::__atomic_futex_unsigned<_Waiter_bit>::_M_load_when_not_equal(unsigned int, std::memory_order)’:
/home/prathamesh.kulkarni/gcc/stage1-c-cxx-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/atomic_futex.h:149:42: error: return-statement with no value, in function returning ‘unsigned int’ [-fpermissive]
       if ((__i & ~_Waiter_bit) != __val) return;
                                          ^
In file included from /home/prathamesh.kulkarni/gcc/stage1-c-cxx-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/future:44:0,
                 from /home/prathamesh.kulkarni/gcc/src/libstdc++-v3/include/precompiled/stdc++.h:104:
/home/prathamesh.kulkarni/gcc/stage1-c-cxx-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/atomic_futex.h: In member function ‘unsigned int std::__atomic_futex_unsigned<_Waiter_bit>::_M_load_when_not_equal(unsigned int, std::memory_order)’:
/home/prathamesh.kulkarni/gcc/stage1-c-cxx-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/bits/atomic_futex.h:149:42: error: return-statement with no value, in function returning ‘unsigned int’ [-fpermissive]
       if ((__i & ~_Waiter_bit) != __val) return;
                                          ^