diff --git a/cmake/CompilerFlags.cmake b/cmake/CompilerFlags.cmake
index 82cb82a1a4e..f9b4c86c7d7 100644
--- a/cmake/CompilerFlags.cmake
+++ b/cmake/CompilerFlags.cmake
@@ -112,13 +112,13 @@ function(set_default_compile_options target)
             -Wno-invalid-offsetof
             -Wno-newline-eof
             -Wno-return-std-move
+            # Allow unused variables with a pattern of `if (auto v = as<...>(...))`.
+            # This pattern is very common in Slang code base.
+            -Wno-unused-but-set-variable
             # Allowed warnings:
             # If a function returns an address/reference to a local, we want it to
             # produce an error, because it probably means something very bad.
             -Werror=return-local-addr
-            # Allow unused variables with a pattern of `if (auto v = as<...>(...))`.
-            # This pattern is very common in Slang code base.
-            -Wno-error=unused-but-set-variable
             # Some warnings which are on by default in MSVC
             -Wnarrowing
         )
@@ -135,7 +135,6 @@ function(set_default_compile_options target)
                 -Wno-sign-compare
                 -Wno-unused-function
                 -Wno-unused-value
-                -Wno-unused-but-set-variable
                 -Wno-implicit-fallthrough
                 -Wno-missing-field-initializers
                 -Wno-strict-aliasing
diff --git a/examples/mlp-training-coopvec/mlp-training-coopvec.cpp b/examples/mlp-training-coopvec/mlp-training-coopvec.cpp
index 9b5dde53148..8bd6a8e0e79 100644
--- a/examples/mlp-training-coopvec/mlp-training-coopvec.cpp
+++ b/examples/mlp-training-coopvec/mlp-training-coopvec.cpp
@@ -165,7 +165,7 @@ struct ExampleProgram : public TestBase
         std::vector<float> inputBufferData;
         for (int i = 0; i < inputCount; i++)
         {
-            inputBufferData.push_back((float)rand() / RAND_MAX);
+            inputBufferData.push_back(rand() / static_cast<float>(RAND_MAX));
         }
         auto inputBuffer = createBuffer(inputCount * sizeof(float), inputBufferData.data());
 
diff --git a/examples/mlp-training/mlp-training.cpp b/examples/mlp-training/mlp-training.cpp
index 38090578f8b..44bbbe58455 100644
--- a/examples/mlp-training/mlp-training.cpp
+++ b/examples/mlp-training/mlp-training.cpp
@@ -164,7 +164,7 @@ struct ExampleProgram : public TestBase
         std::vector<float> inputBufferData;
         for (int i = 0; i < inputCount; i++)
         {
-            inputBufferData.push_back((float)rand() / RAND_MAX);
+            inputBufferData.push_back(rand() / static_cast<float>(RAND_MAX));
         }
         auto inputBuffer = createBuffer(inputCount * sizeof(float), inputBufferData.data());
 
diff --git a/source/slang/slang-ir.cpp b/source/slang/slang-ir.cpp
index 52ad2cf3cea..2391bc25f63 100644
--- a/source/slang/slang-ir.cpp
+++ b/source/slang/slang-ir.cpp
@@ -2303,8 +2303,7 @@ IRConstant* IRBuilder::_findOrEmitConstant(IRConstant& keyInst)
 
 IRInst* IRBuilder::getBoolValue(bool inValue)
 {
-    IRConstant keyInst;
-    memset(&keyInst, 0, sizeof(keyInst));
+    IRConstant keyInst{};
     keyInst.m_op = kIROp_BoolLit;
     keyInst.typeUse.usedValue = getBoolType();
     keyInst.value.intVal = IRIntegerValue(inValue);
@@ -2318,8 +2317,7 @@ IRInst* IRBuilder::getIntValue(IRIntegerValue value)
 
 IRInst* IRBuilder::getIntValue(IRType* type, IRIntegerValue inValue)
 {
-    IRConstant keyInst;
-    memset(&keyInst, 0, sizeof(keyInst));
+    IRConstant keyInst{};
     keyInst.m_op = kIROp_IntLit;
     keyInst.typeUse.usedValue = type;
     // Truncate the input value based on `type`.
@@ -2356,8 +2354,7 @@ IRInst* IRBuilder::getIntValue(IRType* type, IRIntegerValue inValue)
 
 IRInst* IRBuilder::getFloatValue(IRType* type, IRFloatingPointValue inValue)
 {
-    IRConstant keyInst;
-    memset(&keyInst, 0, sizeof(keyInst));
+    IRConstant keyInst{};
     keyInst.m_op = kIROp_FloatLit;
     keyInst.typeUse.usedValue = type;
     // Truncate the input value based on `type`.
@@ -2379,12 +2376,10 @@ IRInst* IRBuilder::getFloatValue(IRType* type, IRFloatingPointValue inValue)
 
 IRStringLit* IRBuilder::getStringValue(const UnownedStringSlice& inSlice)
 {
-    IRConstant keyInst;
-    memset(&keyInst, 0, sizeof(keyInst));
+    IRConstant keyInst{};
 
     // Mark that this is on the stack...
-    IRDecoration stackDecoration;
-    memset(&stackDecoration, 0, sizeof(stackDecoration));
+    IRDecoration stackDecoration{};
     stackDecoration.m_op = kIROp_TransitoryDecoration;
     stackDecoration.insertAtEnd(&keyInst);
 
@@ -2400,8 +2395,7 @@ IRStringLit* IRBuilder::getStringValue(const UnownedStringSlice& inSlice)
 
 IRBlobLit* IRBuilder::getBlobValue(ISlangBlob* blob)
 {
-    IRConstant keyInst;
-    memset(&keyInst, 0, sizeof(keyInst));
+    IRConstant keyInst{};
 
     char* buffer = (char*)(getModule()->getMemoryArena().allocate(blob->getBufferSize()));
     if (!buffer)
@@ -2413,8 +2407,7 @@ IRBlobLit* IRBuilder::getBlobValue(ISlangBlob* blob)
     UnownedStringSlice inSlice(buffer, blob->getBufferSize());
 
     // Mark that this is on the stack...
-    IRDecoration stackDecoration;
-    memset(&stackDecoration, 0, sizeof(stackDecoration));
+    IRDecoration stackDecoration{};
     stackDecoration.m_op = kIROp_TransitoryDecoration;
     stackDecoration.insertAtEnd(&keyInst);
 
@@ -2430,8 +2423,7 @@ IRBlobLit* IRBuilder::getBlobValue(ISlangBlob* blob)
 
 IRPtrLit* IRBuilder::getPtrValue(IRType* type, void* data)
 {
-    IRConstant keyInst;
-    memset(&keyInst, 0, sizeof(keyInst));
+    IRConstant keyInst{};
     keyInst.m_op = kIROp_PtrLit;
     keyInst.typeUse.usedValue = type;
     keyInst.value.ptrVal = data;
@@ -2440,8 +2432,7 @@ IRPtrLit* IRBuilder::getPtrValue(IRType* type, void* data)
 
 IRPtrLit* IRBuilder::getNullPtrValue(IRType* type)
 {
-    IRConstant keyInst;
-    memset(&keyInst, 0, sizeof(keyInst));
+    IRConstant keyInst{};
     keyInst.m_op = kIROp_PtrLit;
     keyInst.typeUse.usedValue = type;
     keyInst.value.ptrVal = nullptr;
@@ -2452,8 +2443,7 @@ IRVoidLit* IRBuilder::getVoidValue()
 {
     IRType* type = getVoidType();
 
-    IRConstant keyInst;
-    memset(&keyInst, 0, sizeof(keyInst));
+    IRConstant keyInst{};
     keyInst.m_op = kIROp_VoidLit;
     keyInst.typeUse.usedValue = type;
     keyInst.value.intVal = 0;
diff --git a/tools/slang-fiddle/slang-fiddle-lua.cpp b/tools/slang-fiddle/slang-fiddle-lua.cpp
index adebf555c44..882289ca492 100644
--- a/tools/slang-fiddle/slang-fiddle-lua.cpp
+++ b/tools/slang-fiddle/slang-fiddle-lua.cpp
@@ -1,5 +1,10 @@
 // slang-fiddle-lua.cpp
-
+#include "slang.h"
 
 #define MAKE_LIB 1
+
+#if SLANG_UNIX_FAMILY
+#define LUA_USE_POSIX
+#endif
+
 #include "lua/onelua.c"