diff --git a/BUILD.gn b/BUILD.gn
index 7242b6f..c32a0fa 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -80,6 +80,8 @@
 
 config("glslang_hlsl") {
   defines = [ "ENABLE_HLSL=1" ]
+
+  cflags = [ "-Wno-conversion" ]
 }
 
 template("glslang_sources_common") {
@@ -227,10 +229,12 @@
         "-Wno-inconsistent-missing-override",
         "-Wno-sign-compare",
         "-Wno-unused-variable",
+        "-Wno-unknown-warning-option",
         "-Wno-missing-field-initializers",
         "-Wno-newline-eof",
       ]
     }
+
     if (is_win && !is_clang) {
       cflags = [
         "/wd4018",  # signed/unsigned mismatch
diff --git a/SPIRV/SPVRemapper.cpp b/SPIRV/SPVRemapper.cpp
index fd0bb89..943b9b6 100644
--- a/SPIRV/SPVRemapper.cpp
+++ b/SPIRV/SPVRemapper.cpp
@@ -827,7 +827,15 @@
             [&](spv::Id& id) {
                 if (thisOpCode != spv::OpNop) {
                     ++idCounter;
-                    const std::uint32_t hashval = opCounter[thisOpCode] * thisOpCode * 50047 + idCounter + fnId * 117;
+                    const std::uint32_t hashval =
+                        // Explicitly cast operands to unsigned int to avoid integer
+                        // promotion to signed int followed by integer overflow,
+                        // which would result in undefined behavior.
+                        static_cast<unsigned int>(opCounter[thisOpCode])
+                        * thisOpCode
+                        * 50047
+                        + idCounter
+                        + static_cast<unsigned int>(fnId) * 117;
 
                     if (isOldIdUnmapped(id))
                         localId(id, nextUnusedId(hashval % softTypeIdLimit + firstMappedID));
diff --git a/glslang/CMakeLists.txt b/glslang/CMakeLists.txt
index 14249bf..552da5e 100644
--- a/glslang/CMakeLists.txt
+++ b/glslang/CMakeLists.txt
@@ -33,7 +33,7 @@
 
 if(WIN32)
     add_subdirectory(OSDependent/Windows)
-elseif(UNIX)
+elseif(UNIX OR "${CMAKE_SYSTEM_NAME}" STREQUAL "Fuchsia")
     add_subdirectory(OSDependent/Unix)
 else(WIN32)
     message("unknown platform")