[libc] fix build errors (#95613)

3 files changed, 4 insertions, 3 deletions

diff --git a/libc/src/__support/threads/linux/rwlock.h b/libc/src/__support/threads/linux/rwlock.h
index 1778995..201fe92 100644
--- a/libc/src/__support/threads/linux/rwlock.h
+++ b/libc/src/__support/threads/linux/rwlock.h
@@ -63,7 +63,7 @@ public:
     WaitingQueue &queue;
     bool is_pshared;
 
-    LIBC_INLINE constexpr Guard(WaitingQueue &queue, bool is_pshared)
+    LIBC_INLINE Guard(WaitingQueue &queue, bool is_pshared)
         : queue(queue), is_pshared(is_pshared) {
       queue.lock(cpp::nullopt, is_pshared);
     }
@@ -189,6 +189,7 @@ public:
       case Role::Writer:
         return !has_active_writer() && !has_pending_writer();
       }
+      __builtin_unreachable();
     } else
       return !has_acitve_owner();
   }
diff --git a/libc/src/pthread/pthread_rwlock_timedrdlock.cpp b/libc/src/pthread/pthread_rwlock_timedrdlock.cpp
index d503d50..6ce69ea 100644
--- a/libc/src/pthread/pthread_rwlock_timedrdlock.cpp
+++ b/libc/src/pthread/pthread_rwlock_timedrdlock.cpp
@@ -42,8 +42,8 @@ LLVM_LIBC_FUNCTION(int, pthread_rwlock_timedrdlock,
     return EINVAL;
   case internal::AbsTimeout::Error::BeforeEpoch:
     return ETIMEDOUT;
-    // default: unreachable, all two cases are covered.
   }
+  __builtin_unreachable();
 }
 
 } // namespace LIBC_NAMESPACE
diff --git a/libc/src/pthread/pthread_rwlock_timedwrlock.cpp b/libc/src/pthread/pthread_rwlock_timedwrlock.cpp
index 5e67730..ad3f913 100644
--- a/libc/src/pthread/pthread_rwlock_timedwrlock.cpp
+++ b/libc/src/pthread/pthread_rwlock_timedwrlock.cpp
@@ -36,8 +36,8 @@ LLVM_LIBC_FUNCTION(int, pthread_rwlock_timedwrlock,
     return EINVAL;
   case internal::AbsTimeout::Error::BeforeEpoch:
     return ETIMEDOUT;
-    // default: unreachable, all two cases are covered.
   }
+  __builtin_unreachable();
 }
 
 } // namespace LIBC_NAMESPACE