diff --git a/.gitignore b/.gitignore
index fdd5c7be..70a9a059 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ temp
 # CMake build directories
 build/
 build_clang/
+build-clang/
 install_test/
 cmake-build-*/
 coverage_html/
diff --git a/src/objects/lobject.h b/src/objects/lobject.h
index 3222defd..d500bb66 100644
--- a/src/objects/lobject.h
+++ b/src/objects/lobject.h
@@ -933,24 +933,24 @@ class ProtoDebugInfo {
 
   /* Phase 112: std::span accessors for debug info arrays */
   inline std::span<ls_byte> getLineInfoSpan() noexcept {
-    return std::span(lineinfo, sizelineinfo);
+    return std::span(lineinfo, static_cast<size_t>(sizelineinfo));
   }
   inline std::span<const ls_byte> getLineInfoSpan() const noexcept {
-    return std::span(lineinfo, sizelineinfo);
+    return std::span(lineinfo, static_cast<size_t>(sizelineinfo));
   }
 
   inline std::span<AbsLineInfo> getAbsLineInfoSpan() noexcept {
-    return std::span(abslineinfo, sizeabslineinfo);
+    return std::span(abslineinfo, static_cast<size_t>(sizeabslineinfo));
   }
   inline std::span<const AbsLineInfo> getAbsLineInfoSpan() const noexcept {
-    return std::span(abslineinfo, sizeabslineinfo);
+    return std::span(abslineinfo, static_cast<size_t>(sizeabslineinfo));
   }
 
   inline std::span<LocVar> getLocVarsSpan() noexcept {
-    return std::span(locvars, sizelocvars);
+    return std::span(locvars, static_cast<size_t>(sizelocvars));
   }
   inline std::span<const LocVar> getLocVarsSpan() const noexcept {
-    return std::span(locvars, sizelocvars);
+    return std::span(locvars, static_cast<size_t>(sizelocvars));
   }
 };
 
@@ -1034,31 +1034,31 @@ class Proto : public GCBase<Proto> {
 
   /* Phase 112: std::span accessors for arrays */
   inline std::span<Instruction> getCodeSpan() noexcept {
-    return std::span(code, sizecode);
+    return std::span(code, static_cast<size_t>(sizecode));
   }
   inline std::span<const Instruction> getCodeSpan() const noexcept {
-    return std::span(code, sizecode);
+    return std::span(code, static_cast<size_t>(sizecode));
   }
 
   inline std::span<TValue> getConstantsSpan() noexcept {
-    return std::span(k, sizek);
+    return std::span(k, static_cast<size_t>(sizek));
   }
   inline std::span<const TValue> getConstantsSpan() const noexcept {
-    return std::span(k, sizek);
+    return std::span(k, static_cast<size_t>(sizek));
   }
 
   inline std::span<Proto*> getProtosSpan() noexcept {
-    return std::span(p, sizep);
+    return std::span(p, static_cast<size_t>(sizep));
   }
   inline std::span<Proto* const> getProtosSpan() const noexcept {
-    return std::span(p, sizep);
+    return std::span(p, static_cast<size_t>(sizep));
   }
 
   inline std::span<Upvaldesc> getUpvaluesSpan() noexcept {
-    return std::span(upvalues, sizeupvalues);
+    return std::span(upvalues, static_cast<size_t>(sizeupvalues));
   }
   inline std::span<const Upvaldesc> getUpvaluesSpan() const noexcept {
-    return std::span(upvalues, sizeupvalues);
+    return std::span(upvalues, static_cast<size_t>(sizeupvalues));
   }
 
   inline Proto** getProtos() const noexcept { return p; }
diff --git a/src/serialization/ldump.cpp b/src/serialization/ldump.cpp
index af1c47ce..f130326a 100644
--- a/src/serialization/ldump.cpp
+++ b/src/serialization/ldump.cpp
@@ -244,7 +244,7 @@ static void dumpDebug (DumpState *D, const Proto *f) {
   auto locvars = f->getDebugInfo().getLocVarsSpan();
   n = (D->strip) ? 0 : static_cast<int>(locvars.size());
   dumpInt(D, n);
-  for (const auto& lv : locvars.subspan(0, n)) {
+  for (const auto& lv : locvars.subspan(0, static_cast<size_t>(n))) {
     dumpString(D, lv.getVarName());
     dumpInt(D, lv.getStartPC());
     dumpInt(D, lv.getEndPC());
@@ -252,7 +252,7 @@ static void dumpDebug (DumpState *D, const Proto *f) {
   auto upvalues = f->getUpvaluesSpan();
   n = (D->strip) ? 0 : static_cast<int>(upvalues.size());
   dumpInt(D, n);
-  for (const auto& uv : upvalues.subspan(0, n)) {
+  for (const auto& uv : upvalues.subspan(0, static_cast<size_t>(n))) {
     dumpString(D, uv.getName());
   }
 }