diff --git a/dtool/src/dtoolbase/atomicAdjustDummyImpl.I b/dtool/src/dtoolbase/atomicAdjustDummyImpl.I
index aa86d2c83e..d7b405ae15 100644
--- a/dtool/src/dtoolbase/atomicAdjustDummyImpl.I
+++ b/dtool/src/dtoolbase/atomicAdjustDummyImpl.I
@@ -18,7 +18,7 @@
 //       Access: Public, Static
 //  Description: Atomically increments the indicated variable.
 ////////////////////////////////////////////////////////////////////
-INLINE void AtomicAdjustDummyImpl::
+ALWAYS_INLINE void AtomicAdjustDummyImpl::
 inc(TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
   ++var;
 }
@@ -30,7 +30,7 @@ inc(TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
 //               returns true if the new value is nonzero, false if it
 //               is zero.
 ////////////////////////////////////////////////////////////////////
-INLINE bool AtomicAdjustDummyImpl::
+ALWAYS_INLINE bool AtomicAdjustDummyImpl::
 dec(TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
   return (--var) != 0;
 }
@@ -41,7 +41,7 @@ dec(TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
 //  Description: Atomically computes var += delta.  It is legal for
 //               delta to be negative.
 ////////////////////////////////////////////////////////////////////
-INLINE void AtomicAdjustDummyImpl::
+ALWAYS_INLINE void AtomicAdjustDummyImpl::
 add(TVOLATILE AtomicAdjustDummyImpl::Integer &var, AtomicAdjustDummyImpl::Integer delta) {
   var += delta;
 }
@@ -52,7 +52,7 @@ add(TVOLATILE AtomicAdjustDummyImpl::Integer &var, AtomicAdjustDummyImpl::Intege
 //  Description: Atomically changes the indicated variable and
 //               returns the original value.
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
+ALWAYS_INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
 set(TVOLATILE AtomicAdjustDummyImpl::Integer &var, AtomicAdjustDummyImpl::Integer new_value) {
   Integer orig_value = var;
   var = new_value;
@@ -68,7 +68,7 @@ set(TVOLATILE AtomicAdjustDummyImpl::Integer &var, AtomicAdjustDummyImpl::Intege
 //               asynchronously setting, incrementing, or decrementing
 //               (via other AtomicAjust methods).
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
+ALWAYS_INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
 get(const TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
   return var;
 }
@@ -79,8 +79,8 @@ get(const TVOLATILE AtomicAdjustDummyImpl::Integer &var) {
 //  Description: Atomically changes the indicated variable and
 //               returns the original value.
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
-set_ptr(TVOLATILE AtomicAdjustDummyImpl::Pointer &var, 
+ALWAYS_INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
+set_ptr(TVOLATILE AtomicAdjustDummyImpl::Pointer &var,
         AtomicAdjustDummyImpl::Pointer new_value) {
   Pointer orig_value = var;
   var = new_value;
@@ -96,7 +96,7 @@ set_ptr(TVOLATILE AtomicAdjustDummyImpl::Pointer &var,
 //               asynchronously setting, incrementing, or decrementing
 //               (via other AtomicAjust methods).
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
+ALWAYS_INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
 get_ptr(const TVOLATILE AtomicAdjustDummyImpl::Pointer &var) {
   return var;
 }
@@ -104,15 +104,15 @@ get_ptr(const TVOLATILE AtomicAdjustDummyImpl::Pointer &var) {
 ////////////////////////////////////////////////////////////////////
 //     Function: AtomicAdjustDummyImpl::compare_and_exchange
 //       Access: Public, Static
-//  Description: Atomic compare and exchange.  
+//  Description: Atomic compare and exchange.
 //
 //               If mem is equal to old_value, store new_value in mem.
 //               In either case, return the original value of mem.
 //               The caller can test for success by comparing
 //               return_value == old_value.
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
-compare_and_exchange(TVOLATILE AtomicAdjustDummyImpl::Integer &mem, 
+ALWAYS_INLINE AtomicAdjustDummyImpl::Integer AtomicAdjustDummyImpl::
+compare_and_exchange(TVOLATILE AtomicAdjustDummyImpl::Integer &mem,
                      AtomicAdjustDummyImpl::Integer old_value,
                      AtomicAdjustDummyImpl::Integer new_value) {
   Integer orig_value = mem;
@@ -125,12 +125,12 @@ compare_and_exchange(TVOLATILE AtomicAdjustDummyImpl::Integer &mem,
 ////////////////////////////////////////////////////////////////////
 //     Function: AtomicAdjustDummyImpl::compare_and_exchange_ptr
 //       Access: Public, Static
-//  Description: Atomic compare and exchange.  
+//  Description: Atomic compare and exchange.
 //
 //               As above, but works on pointers instead of integers.
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
-compare_and_exchange_ptr(TVOLATILE AtomicAdjustDummyImpl::Pointer &mem, 
+ALWAYS_INLINE AtomicAdjustDummyImpl::Pointer AtomicAdjustDummyImpl::
+compare_and_exchange_ptr(TVOLATILE AtomicAdjustDummyImpl::Pointer &mem,
                          AtomicAdjustDummyImpl::Pointer old_value,
                          AtomicAdjustDummyImpl::Pointer new_value) {
   Pointer orig_value = mem;
diff --git a/dtool/src/dtoolbase/atomicAdjustDummyImpl.h b/dtool/src/dtoolbase/atomicAdjustDummyImpl.h
index 17e03c04e6..c77f527dc1 100644
--- a/dtool/src/dtoolbase/atomicAdjustDummyImpl.h
+++ b/dtool/src/dtoolbase/atomicAdjustDummyImpl.h
@@ -31,22 +31,22 @@ public:
   typedef long Integer;
   typedef void *Pointer;
 
-  INLINE static void inc(TVOLATILE Integer &var);
-  INLINE static bool dec(TVOLATILE Integer &var);
-  INLINE static void add(TVOLATILE Integer &var, Integer delta);
-  INLINE static Integer set(TVOLATILE Integer &var, Integer new_value);
-  INLINE static Integer get(const TVOLATILE Integer &var);
+  ALWAYS_INLINE static void inc(TVOLATILE Integer &var);
+  ALWAYS_INLINE static bool dec(TVOLATILE Integer &var);
+  ALWAYS_INLINE static void add(TVOLATILE Integer &var, Integer delta);
+  ALWAYS_INLINE static Integer set(TVOLATILE Integer &var, Integer new_value);
+  ALWAYS_INLINE static Integer get(const TVOLATILE Integer &var);
 
-  INLINE static Pointer set_ptr(TVOLATILE Pointer &var, Pointer new_value);
-  INLINE static Pointer get_ptr(const TVOLATILE Pointer &var);
+  ALWAYS_INLINE static Pointer set_ptr(TVOLATILE Pointer &var, Pointer new_value);
+  ALWAYS_INLINE static Pointer get_ptr(const TVOLATILE Pointer &var);
 
-  INLINE static Integer compare_and_exchange(TVOLATILE Integer &mem, 
-                                             Integer old_value,
-                                             Integer new_value);
+  ALWAYS_INLINE static Integer compare_and_exchange(TVOLATILE Integer &mem,
+                                                    Integer old_value,
+                                                    Integer new_value);
 
-  INLINE static Pointer compare_and_exchange_ptr(TVOLATILE Pointer &mem, 
-                                                 Pointer old_value,
-                                                 Pointer new_value);
+  ALWAYS_INLINE static Pointer compare_and_exchange_ptr(TVOLATILE Pointer &mem,
+                                                        Pointer old_value,
+                                                        Pointer new_value);
 };
 
 #include "atomicAdjustDummyImpl.I"
diff --git a/dtool/src/dtoolbase/atomicAdjustWin32Impl.I b/dtool/src/dtoolbase/atomicAdjustWin32Impl.I
index d96fe98bc1..f04dfbe8fa 100644
--- a/dtool/src/dtoolbase/atomicAdjustWin32Impl.I
+++ b/dtool/src/dtoolbase/atomicAdjustWin32Impl.I
@@ -18,7 +18,7 @@
 //       Access: Public, Static
 //  Description: Atomically increments the indicated variable.
 ////////////////////////////////////////////////////////////////////
-INLINE void AtomicAdjustWin32Impl::
+ALWAYS_INLINE void AtomicAdjustWin32Impl::
 inc(TVOLATILE AtomicAdjustWin32Impl::Integer &var) {
   assert((((size_t)&var) & (sizeof(Integer) - 1)) == 0);
 #ifdef _WIN64
@@ -35,7 +35,7 @@ inc(TVOLATILE AtomicAdjustWin32Impl::Integer &var) {
 //               returns true if the new value is nonzero, false if it
 //               is zero.
 ////////////////////////////////////////////////////////////////////
-INLINE bool AtomicAdjustWin32Impl::
+ALWAYS_INLINE bool AtomicAdjustWin32Impl::
 dec(TVOLATILE AtomicAdjustWin32Impl::Integer &var) {
   assert((((size_t)&var) & (sizeof(Integer) - 1)) == 0);
 #ifdef _WIN64
@@ -70,7 +70,7 @@ add(TVOLATILE AtomicAdjustWin32Impl::Integer &var, AtomicAdjustWin32Impl::Intege
 //  Description: Atomically changes the indicated variable and
 //               returns the original value.
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustWin32Impl::Integer AtomicAdjustWin32Impl::
+ALWAYS_INLINE AtomicAdjustWin32Impl::Integer AtomicAdjustWin32Impl::
 set(TVOLATILE AtomicAdjustWin32Impl::Integer &var, 
     AtomicAdjustWin32Impl::Integer new_value) {
   assert((((size_t)&var) & (sizeof(Integer) - 1)) == 0);
@@ -90,7 +90,7 @@ set(TVOLATILE AtomicAdjustWin32Impl::Integer &var,
 //               asynchronously setting, incrementing, or decrementing
 //               (via other AtomicAjust methods).
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustWin32Impl::Integer AtomicAdjustWin32Impl::
+ALWAYS_INLINE AtomicAdjustWin32Impl::Integer AtomicAdjustWin32Impl::
 get(const TVOLATILE AtomicAdjustWin32Impl::Integer &var) {
   // On Intel platforms, word-aligned loads are atomic (if performed
   // in a single instruction).  We can't guarantee the compiler will
@@ -107,7 +107,7 @@ get(const TVOLATILE AtomicAdjustWin32Impl::Integer &var) {
 //  Description: Atomically changes the indicated variable and
 //               returns the original value.
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustWin32Impl::Pointer AtomicAdjustWin32Impl::
+ALWAYS_INLINE AtomicAdjustWin32Impl::Pointer AtomicAdjustWin32Impl::
 set_ptr(TVOLATILE AtomicAdjustWin32Impl::Pointer &var, 
         AtomicAdjustWin32Impl::Pointer new_value) {
   assert((((size_t)&var) & (sizeof(Pointer) - 1)) == 0);
@@ -123,7 +123,7 @@ set_ptr(TVOLATILE AtomicAdjustWin32Impl::Pointer &var,
 //               asynchronously setting, incrementing, or decrementing
 //               (via other AtomicAjust methods).
 ////////////////////////////////////////////////////////////////////
-INLINE AtomicAdjustWin32Impl::Pointer AtomicAdjustWin32Impl::
+ALWAYS_INLINE AtomicAdjustWin32Impl::Pointer AtomicAdjustWin32Impl::
 get_ptr(const TVOLATILE AtomicAdjustWin32Impl::Pointer &var) {
   // As in get(), make sure the address is word-aligned.
   assert((((size_t)&var) & (sizeof(Pointer) - 1)) == 0);
diff --git a/dtool/src/dtoolbase/atomicAdjustWin32Impl.h b/dtool/src/dtoolbase/atomicAdjustWin32Impl.h
index 2ead06d0fe..2018560577 100644
--- a/dtool/src/dtoolbase/atomicAdjustWin32Impl.h
+++ b/dtool/src/dtoolbase/atomicAdjustWin32Impl.h
@@ -45,20 +45,20 @@ public:
   typedef ALIGN_4BYTE UnalignedPointer Pointer;
 #endif  // _WIN64
 
-  INLINE static void inc(TVOLATILE Integer &var);
-  INLINE static bool dec(TVOLATILE Integer &var);
+  ALWAYS_INLINE static void inc(TVOLATILE Integer &var);
+  ALWAYS_INLINE static bool dec(TVOLATILE Integer &var);
   INLINE static void add(TVOLATILE Integer &var, Integer delta);
-  INLINE static Integer set(TVOLATILE Integer &var, Integer new_value);
-  INLINE static Integer get(const TVOLATILE Integer &var);
+  ALWAYS_INLINE static Integer set(TVOLATILE Integer &var, Integer new_value);
+  ALWAYS_INLINE static Integer get(const TVOLATILE Integer &var);
 
-  INLINE static Pointer set_ptr(TVOLATILE Pointer &var, Pointer new_value);
-  INLINE static Pointer get_ptr(const TVOLATILE Pointer &var);
+  ALWAYS_INLINE static Pointer set_ptr(TVOLATILE Pointer &var, Pointer new_value);
+  ALWAYS_INLINE static Pointer get_ptr(const TVOLATILE Pointer &var);
 
-  INLINE static Integer compare_and_exchange(TVOLATILE Integer &mem, 
+  INLINE static Integer compare_and_exchange(TVOLATILE Integer &mem,
                                              Integer old_value,
                                              Integer new_value);
-  
-  INLINE static Pointer compare_and_exchange_ptr(TVOLATILE Pointer &mem, 
+
+  INLINE static Pointer compare_and_exchange_ptr(TVOLATILE Pointer &mem,
                                                  Pointer old_value,
                                                  Pointer new_value);
 };
diff --git a/dtool/src/dtoolbase/dtoolbase_cc.h b/dtool/src/dtoolbase/dtoolbase_cc.h
index efefd36e9e..60ea4bd37f 100644
--- a/dtool/src/dtoolbase/dtoolbase_cc.h
+++ b/dtool/src/dtoolbase/dtoolbase_cc.h
@@ -32,6 +32,7 @@
 using namespace std;
 
 #define INLINE inline
+#define ALWAYS_INLINE inline
 #define TYPENAME typename
 #define CONSTEXPR
 #define NOEXCEPT noexcept
@@ -115,11 +116,19 @@ typedef ios::iostate ios_iostate;
 typedef ios::seekdir ios_seekdir;
 #endif
 
-#if defined(WIN32_VC) && defined(FORCE_INLINING)
+#ifdef _MSC_VER
+#define ALWAYS_INLINE __forceinline
+#elif defined(__GNUC__)
+#define ALWAYS_INLINE __attribute__((always_inline)) inline
+#else
+#define ALWAYS_INLINE inline
+#endif
+
+#ifdef FORCE_INLINING
 // If FORCE_INLINING is defined, we use the keyword __forceinline,
 // which tells MS VC++ to override its internal benefit heuristic
 // and inline the fn if it is technically possible to do so.
-#define INLINE __forceinline
+#define INLINE ALWAYS_INLINE
 #else
 #define INLINE inline
 #endif
diff --git a/dtool/src/dtoolbase/typeHandle.I b/dtool/src/dtoolbase/typeHandle.I
index e489fd4099..867bdb4cea 100644
--- a/dtool/src/dtoolbase/typeHandle.I
+++ b/dtool/src/dtoolbase/typeHandle.I
@@ -263,24 +263,3 @@ INLINE TypeHandle::
 operator bool () const {
   return (_index != 0);
 }
-
-////////////////////////////////////////////////////////////////////
-//     Function: get_best_parent_from_Set
-//       Access: Published
-//  Description: Return the Index of the BEst fit Classs from a set
-////////////////////////////////////////////////////////////////////
-INLINE  int TypeHandle::get_best_parent_from_Set(const std::set< int > &legal_vals) const
-{
-    if(legal_vals.find(_index) != legal_vals.end())
-        return _index;
-        
-    for(int pi = 0; pi < get_num_parent_classes() ; pi++)
-    {
-        TypeHandle ph = get_parent_class(pi);
-        int val = ph.get_best_parent_from_Set(legal_vals);
-        if(val > 0)
-            return val;
-    
-    }
-    return -1;
-}
diff --git a/dtool/src/dtoolbase/typeHandle.cxx b/dtool/src/dtoolbase/typeHandle.cxx
index cca55062c1..d807a298b6 100644
--- a/dtool/src/dtoolbase/typeHandle.cxx
+++ b/dtool/src/dtoolbase/typeHandle.cxx
@@ -84,6 +84,27 @@ dec_memory_usage(MemoryClass memory_class, size_t size) {
 }
 #endif  // DO_MEMORY_USAGE
 
+////////////////////////////////////////////////////////////////////
+//     Function: get_best_parent_from_Set
+//       Access: Published
+//  Description: Return the Index of the BEst fit Classs from a set
+////////////////////////////////////////////////////////////////////
+int TypeHandle::
+get_best_parent_from_Set(const std::set< int > &legal_vals) const {
+  if (legal_vals.find(_index) != legal_vals.end()) {
+    return _index;
+  }
+
+  for (int pi = 0; pi < get_num_parent_classes(); ++pi) {
+    TypeHandle ph = get_parent_class(pi);
+    int val = ph.get_best_parent_from_Set(legal_vals);
+    if (val > 0) {
+      return val;
+    }
+  }
+  return -1;
+}
+
 ostream &
 operator << (ostream &out, TypeHandle::MemoryClass mem_class) {
   switch (mem_class) {
diff --git a/dtool/src/dtoolbase/typeHandle.h b/dtool/src/dtoolbase/typeHandle.h
index c669fa8084..f94e983447 100644
--- a/dtool/src/dtoolbase/typeHandle.h
+++ b/dtool/src/dtoolbase/typeHandle.h
@@ -123,7 +123,7 @@ PUBLISHED:
   INLINE TypeHandle get_parent_towards(TypeHandle ancestor,
                                        TypedObject *object = (TypedObject *)NULL) const;
 
-  INLINE int get_best_parent_from_Set(const std::set< int > &legal_vals) const;
+  int get_best_parent_from_Set(const std::set< int > &legal_vals) const;
 
 #ifdef DO_MEMORY_USAGE
   int get_memory_usage(MemoryClass memory_class) const;
diff --git a/dtool/src/prc/configFlags.I b/dtool/src/prc/configFlags.I
index f0bb39bf51..d13cdd2699 100644
--- a/dtool/src/prc/configFlags.I
+++ b/dtool/src/prc/configFlags.I
@@ -20,7 +20,7 @@
 //               valid (based on a comparison of the supplied
 //               local_modified value with the global_modified value).
 ////////////////////////////////////////////////////////////////////
-INLINE bool ConfigFlags::
+ALWAYS_INLINE bool ConfigFlags::
 is_cache_valid(AtomicAdjust::Integer local_modified) {
   return local_modified == _global_modified;
 }
@@ -32,7 +32,7 @@ is_cache_valid(AtomicAdjust::Integer local_modified) {
 //               the cache will appear to be valid, until someone next
 //               calls invalidate_cache().
 ////////////////////////////////////////////////////////////////////
-INLINE void ConfigFlags::
+ALWAYS_INLINE void ConfigFlags::
 mark_cache_valid(AtomicAdjust::Integer &local_modified) {
   local_modified = _global_modified;
 }
diff --git a/dtool/src/prc/configFlags.h b/dtool/src/prc/configFlags.h
index a90bdc1f33..b7a3205468 100644
--- a/dtool/src/prc/configFlags.h
+++ b/dtool/src/prc/configFlags.h
@@ -62,8 +62,8 @@ PUBLISHED:
   };
 
 protected:
-  INLINE static bool is_cache_valid(AtomicAdjust::Integer local_modified);
-  INLINE static void mark_cache_valid(AtomicAdjust::Integer &local_modified); 
+  ALWAYS_INLINE static bool is_cache_valid(AtomicAdjust::Integer local_modified);
+  ALWAYS_INLINE static void mark_cache_valid(AtomicAdjust::Integer &local_modified);
   INLINE static AtomicAdjust::Integer initial_invalid_cache();
   INLINE static void invalidate_cache();
 
diff --git a/panda/src/pgraph/nodePath.I b/panda/src/pgraph/nodePath.I
index ce0228174a..4c19e3fdc2 100644
--- a/panda/src/pgraph/nodePath.I
+++ b/panda/src/pgraph/nodePath.I
@@ -517,23 +517,6 @@ reverse_ls() const {
   reverse_ls(nout);
 }
 
-////////////////////////////////////////////////////////////////////
-//     Function: NodePath::reverse_ls
-//       Access: Published
-//  Description: Lists the hierarchy at and above the referenced node.
-////////////////////////////////////////////////////////////////////
-INLINE int NodePath::
-reverse_ls(ostream &out, int indent_level) const {
-  if (is_empty()) {
-    out << "(empty)\n";
-    return 0;
-  } else if (has_parent()) {
-    indent_level = get_parent().reverse_ls(out, indent_level);
-  }
-  node()->write(out, indent_level);
-  return indent_level + 2;
-}
-
 ////////////////////////////////////////////////////////////////////
 //     Function: NodePath::set_state
 //       Access: Published
diff --git a/panda/src/pgraph/nodePath.cxx b/panda/src/pgraph/nodePath.cxx
index 20a2f90ab4..5fe2c1ab3b 100644
--- a/panda/src/pgraph/nodePath.cxx
+++ b/panda/src/pgraph/nodePath.cxx
@@ -810,6 +810,23 @@ detach_node(Thread *current_thread) {
   }
 }
 
+////////////////////////////////////////////////////////////////////
+//     Function: NodePath::reverse_ls
+//       Access: Published
+//  Description: Lists the hierarchy at and above the referenced node.
+////////////////////////////////////////////////////////////////////
+int NodePath::
+reverse_ls(ostream &out, int indent_level) const {
+  if (is_empty()) {
+    out << "(empty)\n";
+    return 0;
+  } else if (has_parent()) {
+    indent_level = get_parent().reverse_ls(out, indent_level);
+  }
+  node()->write(out, indent_level);
+  return indent_level + 2;
+}
+
 ////////////////////////////////////////////////////////////////////
 //     Function: NodePath::output
 //       Access: Published
diff --git a/panda/src/pgraph/nodePath.h b/panda/src/pgraph/nodePath.h
index 4e7a098601..0762600b2e 100644
--- a/panda/src/pgraph/nodePath.h
+++ b/panda/src/pgraph/nodePath.h
@@ -278,8 +278,7 @@ PUBLISHED:
   INLINE void ls() const;
   INLINE void ls(ostream &out, int indent_level = 0) const;
   INLINE void reverse_ls() const;
-  INLINE int reverse_ls(ostream &out, int indent_level = 0) const;
-
+  int reverse_ls(ostream &out, int indent_level = 0) const;
 
   // Aggregate transform and state information.
   const RenderState *get_state(Thread *current_thread = Thread::get_current_thread()) const;