Build with -Wunused-variable

CMakeLists.txt

@@ -32,7 +32,12 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
 endif()
 
 add_compile_options(
-  -Werror=switch-enum -Wswitch-enum -fPIC -fdata-sections -ffunction-sections
+  -Werror=switch-enum
+  -Wswitch-enum
+  -Wunused-variable
+  -fPIC
+  -fdata-sections
+  -ffunction-sections
   -fno-jump-tables # https://github.com/llvm/llvm-project/issues/54247
 )
 

ConflictSet.cpp

@@ -5862,13 +5862,13 @@ void checkVersionsGeqOldestExtant(Node *n,
   case Type_Node0: {
   } break;
   case Type_Node3: {
-    auto *self = static_cast<Node3 *>(n);
+    [[maybe_unused]] auto *self = static_cast<Node3 *>(n);
     for (int i = 0; i < 3; ++i) {
       assert(self->childMaxVersion[i] >= oldestExtantVersion);
     }
   } break;
   case Type_Node16: {
-    auto *self = static_cast<Node16 *>(n);
+    [[maybe_unused]] auto *self = static_cast<Node16 *>(n);
     for (int i = 0; i < 16; ++i) {
       assert(self->childMaxVersion[i] >= oldestExtantVersion);
     }
@@ -5878,7 +5878,7 @@ void checkVersionsGeqOldestExtant(Node *n,
     for (int i = 0; i < 48; ++i) {
       assert(self->childMaxVersion[i] >= oldestExtantVersion);
     }
-    for (auto m : self->maxOfMax) {
+    for ([[maybe_unused]] auto m : self->maxOfMax) {
       assert(m >= oldestExtantVersion);
     }
   } break;
@@ -5887,7 +5887,7 @@ void checkVersionsGeqOldestExtant(Node *n,
     for (int i = 0; i < 256; ++i) {
       assert(self->childMaxVersion[i] >= oldestExtantVersion);
     }
-    for (auto m : self->maxOfMax) {
+    for ([[maybe_unused]] auto m : self->maxOfMax) {
       assert(m >= oldestExtantVersion);
     }
   } break;

SkipList.cpp

@@ -796,7 +796,6 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
     int temp[stripeSize];
     int stripes = (stringCount + stripeSize - 1) / stripeSize;
     StringRef values[stripeSize];
-    int64_t writeVersions[stripeSize / 2];
     int ss = stringCount - (stripes - 1) * stripeSize;
     int64_t entryDelta = 0;
     for (int s = stripes - 1; s >= 0; s--) {