diff --git a/CMakeLists.txt b/CMakeLists.txt
index fd9335e..f4a6fb1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -279,17 +279,23 @@
     add_dependencies(${target} glslang-build-info)
 endfunction()
 
+# glslang_default_to_hidden_visibility() makes the symbol visibility hidden by
+# default for <target>.
+function(glslang_default_to_hidden_visibility target)
+    if(NOT WIN32)
+        target_compile_options(${target} PRIVATE "-fvisibility=hidden")
+    endif()
+endfunction()
+
 # glslang_only_export_explicit_symbols() makes the symbol visibility hidden by
-# default for <target> when building shared libraries, and sets the
-# GLSLANG_IS_SHARED_LIBRARY define, and GLSLANG_EXPORTING to 1 when specifically
-# building <target>.
+# default for <target>, and sets the GLSLANG_IS_SHARED_LIBRARY define, and 
+# GLSLANG_EXPORTING to 1 when specifically building <target>.
 function(glslang_only_export_explicit_symbols target)
+    glslang_default_to_hidden_visibility(${target})
     if(BUILD_SHARED_LIBS)
         target_compile_definitions(${target} PUBLIC "GLSLANG_IS_SHARED_LIBRARY=1")
         if(WIN32)
             target_compile_definitions(${target} PRIVATE "GLSLANG_EXPORTING=1")
-        else()
-            target_compile_options(${target} PRIVATE "-fvisibility=hidden")
         endif()
     endif()
 endfunction()
diff --git a/OGLCompilersDLL/CMakeLists.txt b/OGLCompilersDLL/CMakeLists.txt
index 0b007d4..246b4e7 100644
--- a/OGLCompilersDLL/CMakeLists.txt
+++ b/OGLCompilersDLL/CMakeLists.txt
@@ -36,6 +36,7 @@
 add_library(OGLCompiler STATIC ${SOURCES})
 set_property(TARGET OGLCompiler PROPERTY FOLDER glslang)
 set_property(TARGET OGLCompiler PROPERTY POSITION_INDEPENDENT_CODE ON)
+glslang_default_to_hidden_visibility(OGLCompiler)
 
 if(WIN32)
     source_group("Source" FILES ${SOURCES})
diff --git a/OGLCompilersDLL/InitializeDll.cpp b/OGLCompilersDLL/InitializeDll.cpp
index abea910..ab3762e 100644
--- a/OGLCompilersDLL/InitializeDll.cpp
+++ b/OGLCompilersDLL/InitializeDll.cpp
@@ -32,134 +32,6 @@
 // POSSIBILITY OF SUCH DAMAGE.
 //
 
-#define SH_EXPORTING
-
-#include <cassert>
-
-#include "InitializeDll.h"
-#include "../glslang/Include/InitializeGlobals.h"
-#include "../glslang/Public/ShaderLang.h"
-#include "../glslang/Include/PoolAlloc.h"
-
 namespace glslang {
 
-OS_TLSIndex ThreadInitializeIndex = OS_INVALID_TLS_INDEX;
-
-// Per-process initialization.
-// Needs to be called at least once before parsing, etc. is done.
-// Will also do thread initialization for the calling thread; other
-// threads will need to do that explicitly.
-bool InitProcess()
-{
-    glslang::GetGlobalLock();
-
-    if (ThreadInitializeIndex != OS_INVALID_TLS_INDEX) {
-        //
-        // Function is re-entrant.
-        //
-
-        glslang::ReleaseGlobalLock();
-        return true;
-    }
-
-    ThreadInitializeIndex = OS_AllocTLSIndex();
-
-    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX) {
-        assert(0 && "InitProcess(): Failed to allocate TLS area for init flag");
-
-        glslang::ReleaseGlobalLock();
-        return false;
-    }
-
-    if (! InitializePoolIndex()) {
-        assert(0 && "InitProcess(): Failed to initialize global pool");
-
-        glslang::ReleaseGlobalLock();
-        return false;
-    }
-
-    if (! InitThread()) {
-        assert(0 && "InitProcess(): Failed to initialize thread");
-
-        glslang::ReleaseGlobalLock();
-        return false;
-    }
-
-    glslang::ReleaseGlobalLock();
-    return true;
-}
-
-// Per-thread scoped initialization.
-// Must be called at least once by each new thread sharing the
-// symbol tables, etc., needed to parse.
-bool InitThread()
-{
-    //
-    // This function is re-entrant
-    //
-    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX) {
-        assert(0 && "InitThread(): Process hasn't been initalised.");
-        return false;
-    }
-
-    if (OS_GetTLSValue(ThreadInitializeIndex) != 0)
-        return true;
-
-    if (! OS_SetTLSValue(ThreadInitializeIndex, (void *)1)) {
-        assert(0 && "InitThread(): Unable to set init flag.");
-        return false;
-    }
-
-    glslang::SetThreadPoolAllocator(nullptr);
-
-    return true;
-}
-
-// Not necessary to call this: InitThread() is reentrant, and the need
-// to do per thread tear down has been removed.
-//
-// This is kept, with memory management removed, to satisfy any exiting
-// calls to it that rely on it.
-bool DetachThread()
-{
-    bool success = true;
-
-    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
-        return true;
-
-    //
-    // Function is re-entrant and this thread may not have been initialized.
-    //
-    if (OS_GetTLSValue(ThreadInitializeIndex) != 0) {
-        if (!OS_SetTLSValue(ThreadInitializeIndex, (void *)0)) {
-            assert(0 && "DetachThread(): Unable to clear init flag.");
-            success = false;
-        }
-    }
-
-    return success;
-}
-
-// Not necessary to call this: InitProcess() is reentrant.
-//
-// This is kept, with memory management removed, to satisfy any exiting
-// calls to it that rely on it.
-//
-// Users of glslang should call shFinalize() or glslang::FinalizeProcess() for
-// process-scoped memory tear down.
-bool DetachProcess()
-{
-    bool success = true;
-
-    if (ThreadInitializeIndex == OS_INVALID_TLS_INDEX)
-        return true;
-
-    success = DetachThread();
-
-    OS_FreeTLSIndex(ThreadInitializeIndex);
-    ThreadInitializeIndex = OS_INVALID_TLS_INDEX;
-
-    return success;
-}
-
 } // end namespace glslang
diff --git a/OGLCompilersDLL/InitializeDll.h b/OGLCompilersDLL/InitializeDll.h
index 661cee4..b18e2ab 100644
--- a/OGLCompilersDLL/InitializeDll.h
+++ b/OGLCompilersDLL/InitializeDll.h
@@ -38,10 +38,10 @@
 
 namespace glslang {
 
-bool InitProcess();
-bool InitThread();
-bool DetachThread();  // not called from standalone, perhaps other tools rely on parts of it
-bool DetachProcess(); // not called from standalone, perhaps other tools rely on parts of it
+inline bool InitProcess()   { return true; } // DEPRECATED
+inline bool InitThread()    { return true; } // DEPRECATED
+inline bool DetachThread()  { return true; } // DEPRECATED
+inline bool DetachProcess() { return true; } // DEPRECATED
 
 } // end namespace glslang
 
diff --git a/SPIRV/CMakeLists.txt b/SPIRV/CMakeLists.txt
index d699dad..53ada4f 100644
--- a/SPIRV/CMakeLists.txt
+++ b/SPIRV/CMakeLists.txt
@@ -43,8 +43,7 @@
     CInterface/spirv_c_interface.cpp)
 
 set(SPVREMAP_SOURCES
-    SPVRemapper.cpp
-    doc.cpp)
+    SPVRemapper.cpp)
 
 set(HEADERS
     bitutils.h
@@ -69,6 +68,7 @@
     doc.h)
 
 add_library(SPIRV ${LIB_TYPE} ${SOURCES} ${HEADERS})
+target_link_libraries(SPIRV PRIVATE MachineIndependent)
 set_property(TARGET SPIRV PROPERTY FOLDER glslang)
 set_property(TARGET SPIRV PROPERTY POSITION_INDEPENDENT_CODE ON)
 target_include_directories(SPIRV PUBLIC
@@ -79,6 +79,7 @@
 
 if (ENABLE_SPVREMAPPER)
     add_library(SPVRemapper ${LIB_TYPE} ${SPVREMAP_SOURCES} ${SPVREMAP_HEADERS})
+    target_link_libraries(SPVRemapper PRIVATE SPIRV)
     set_property(TARGET SPVRemapper PROPERTY FOLDER glslang)
     set_property(TARGET SPVRemapper PROPERTY POSITION_INDEPENDENT_CODE ON)
 endif()
@@ -95,12 +96,10 @@
         PRIVATE ${spirv-tools_SOURCE_DIR}/include
         PRIVATE ${spirv-tools_SOURCE_DIR}/source
     )
-    target_link_libraries(SPIRV PRIVATE MachineIndependent SPIRV-Tools-opt)
+    target_link_libraries(SPIRV PRIVATE SPIRV-Tools-opt)
     target_include_directories(SPIRV PUBLIC
         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../External>
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/External>)
-else()
-    target_link_libraries(SPIRV PRIVATE MachineIndependent)
 endif(ENABLE_OPT)
 
 if(WIN32)
diff --git a/glslang/CMakeLists.txt b/glslang/CMakeLists.txt
index 1c7d22a..14249bf 100644
--- a/glslang/CMakeLists.txt
+++ b/glslang/CMakeLists.txt
@@ -52,6 +52,7 @@
     GenericCodeGen/Link.cpp)
 set_property(TARGET GenericCodeGen PROPERTY POSITION_INDEPENDENT_CODE ON)
 set_property(TARGET GenericCodeGen PROPERTY FOLDER glslang)
+glslang_default_to_hidden_visibility(GenericCodeGen)
 
 ################################################################################
 # MachineIndependent
@@ -133,6 +134,7 @@
 add_library(MachineIndependent STATIC ${MACHINEINDEPENDENT_SOURCES} ${MACHINEINDEPENDENT_HEADERS})
 set_property(TARGET MachineIndependent PROPERTY POSITION_INDEPENDENT_CODE ON)
 set_property(TARGET MachineIndependent PROPERTY FOLDER glslang)
+glslang_only_export_explicit_symbols(MachineIndependent)
 
 glslang_add_build_info_dependency(MachineIndependent)
 
@@ -168,7 +170,7 @@
     POSITION_INDEPENDENT_CODE ON
     VERSION   "${GLSLANG_VERSION}"
     SOVERSION "${GLSLANG_VERSION_MAJOR}")
-target_link_libraries(glslang PRIVATE OGLCompiler OSDependent MachineIndependent)
+target_link_libraries(glslang PRIVATE OGLCompiler MachineIndependent)
 target_include_directories(glslang PUBLIC
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/..>
     $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
diff --git a/glslang/Include/InitializeGlobals.h b/glslang/Include/InitializeGlobals.h
index 95d0a40..b7fdd7a 100644
--- a/glslang/Include/InitializeGlobals.h
+++ b/glslang/Include/InitializeGlobals.h
@@ -37,7 +37,7 @@
 
 namespace glslang {
 
-bool InitializePoolIndex();
+inline bool InitializePoolIndex() { return true; } // DEPRECATED: No need to call
 
 } // end namespace glslang
 
diff --git a/glslang/MachineIndependent/PoolAlloc.cpp b/glslang/MachineIndependent/PoolAlloc.cpp
index 84c40f4..c269d7d 100644
--- a/glslang/MachineIndependent/PoolAlloc.cpp
+++ b/glslang/MachineIndependent/PoolAlloc.cpp
@@ -35,34 +35,28 @@
 #include "../Include/Common.h"
 #include "../Include/PoolAlloc.h"
 
-#include "../Include/InitializeGlobals.h"
-#include "../OSDependent/osinclude.h"
-
 namespace glslang {
 
-// Process-wide TLS index
-OS_TLSIndex PoolIndex;
+namespace {
+thread_local TPoolAllocator* threadPoolAllocator = nullptr;
+
+TPoolAllocator* GetDefaultThreadPoolAllocator()
+{
+    thread_local TPoolAllocator defaultAllocator;
+    return &defaultAllocator;
+}
+} // anonymous namespace
 
 // Return the thread-specific current pool.
 TPoolAllocator& GetThreadPoolAllocator()
 {
-    return *static_cast<TPoolAllocator*>(OS_GetTLSValue(PoolIndex));
+    return *(threadPoolAllocator ? threadPoolAllocator : GetDefaultThreadPoolAllocator());
 }
 
 // Set the thread-specific current pool.
 void SetThreadPoolAllocator(TPoolAllocator* poolAllocator)
 {
-    OS_SetTLSValue(PoolIndex, poolAllocator);
-}
-
-// Process-wide set up of the TLS pool storage.
-bool InitializePoolIndex()
-{
-    // Allocate a TLS index.
-    if ((PoolIndex = OS_AllocTLSIndex()) == OS_INVALID_TLS_INDEX)
-        return false;
-
-    return true;
+    threadPoolAllocator = poolAllocator;
 }
 
 //