diff --git a/Protocol2.m b/Protocol2.m
index 154403ba..61ef6ba8 100644
--- a/Protocol2.m
+++ b/Protocol2.m
@@ -22,24 +22,12 @@ - (id)self { return self; }
 @interface __IncompleteProtocol : Protocol @end
 @implementation __IncompleteProtocol @end
 
-/**
- * This class exists for the sole reason that the legacy GNU ABI did not
- * provide a way of registering protocols with the runtime.  With the new ABI,
- * every protocol in a compilation unit that is not referenced should be added
- * in a category on this class.  This ensures that the runtime sees every
- * protocol at least once and can perform uniquing.
- */
-@interface __ObjC_Protocol_Holder_Ugly_Hack { id isa; } @end
-@implementation __ObjC_Protocol_Holder_Ugly_Hack @end
-
 @implementation Object @end
 
-@implementation ProtocolGCC @end
 @implementation ProtocolGSv1 @end
 
 PRIVATE void link_protocol_classes(void)
 {
 	[Protocol class];
-	[ProtocolGCC class];
 	[ProtocolGSv1 class];
 }
diff --git a/abi_version.c b/abi_version.c
index cfddfe0e..75c09ff7 100644
--- a/abi_version.c
+++ b/abi_version.c
@@ -32,7 +32,6 @@ struct objc_abi_version
 
 enum
 {
-	gcc_abi = 8,
 	gnustep_abi = 9,
 	gc_abi = 10
 };
@@ -42,12 +41,10 @@ enum
  */
 static struct objc_abi_version known_abis[] =
 {
-	/* GCC ABI. */
-	{gcc_abi, gcc_abi, gnustep_abi, sizeof(struct objc_module_abi_8)},
 	/* Non-fragile ABI. */
-	{gnustep_abi, gcc_abi, gc_abi, sizeof(struct objc_module_abi_8)},
+	{gnustep_abi, gnustep_abi, gc_abi, sizeof(struct objc_module_abi_8)},
 	/* GC ABI.  Adds a field describing the GC mode. */
-	{gc_abi, gcc_abi, gc_abi, sizeof(struct objc_module_abi_10)}
+	{gc_abi, gnustep_abi, gc_abi, sizeof(struct objc_module_abi_10)}
 };
 
 static int known_abi_count =
diff --git a/category.h b/category.h
index 4a3b685c..c228d05a 100644
--- a/category.h
+++ b/category.h
@@ -37,26 +37,26 @@ struct objc_category
 	struct objc_property_list *class_properties;
 };
 
-struct objc_category_gcc
+struct objc_category_gsv1
 {
-	/** 
-	 * The name of this category.
-	 */
-	const char                *name;
-	/**
-	 * The name of the class to which this category should be applied.
-	 */
-	const char                *class_name;
-	/**
-	 * The list of instance methods to add to the class.
-	 */
-	struct objc_method_list_gcc   *instance_methods;
-	/**
-	 * The list of class methods to add to the class.
-	 */
-	struct objc_method_list_gcc   *class_methods;
-	/**
-	 * The list of protocols adopted by this category.
-	 */
-	struct objc_protocol_list *protocols;
+    /** 
+     * The name of this category.
+     */
+    const char                *name;
+    /**
+     * The name of the class to which this category should be applied.
+     */
+    const char                *class_name;
+    /**
+     * The list of instance methods to add to the class.
+     */
+    struct objc_method_list_gsv1 *instance_methods;
+    /**
+     * The list of class methods to add to the class.
+     */
+    struct objc_method_list_gsv1 *class_methods;
+    /**
+     * The list of protocols adopted by this category.
+     */
+    struct objc_protocol_list *protocols;
 };
diff --git a/class.h b/class.h
index 0910d0b7..a22e3f1f 100644
--- a/class.h
+++ b/class.h
@@ -184,12 +184,12 @@ struct objc_class_gsv1
 	/**
 	 * Metadata describing the instance variables in this class.
 	 */
-	struct objc_ivar_list_gcc *ivars;
+	struct objc_ivar_list_gsv1 *ivars;
 	/**
 	 * Metadata for for defining the mappings from selectors to IMPs.  Linked
 	 * list of method list structures, one per class and one per category.
 	 */
-	struct objc_method_list_gcc   *methods;
+	struct objc_method_list_gsv1   *methods;
 	/**
 	 * The dispatch table for this class.  Intialized and maintained by the
 	 * runtime.
@@ -274,29 +274,6 @@ struct objc_class_gsv1
 	uintptr_t                  weak_pointers;
 };
 
-/**
- * Structure representing the GCC ABI class structure.  This is only ever
- * required so that we can take its size - struct objc_class begins with the
- * same fields, and you can test the new abi flag to tell whether it is safe to
- * access the subsequent fields.
- */
-struct objc_class_gcc
-{
-	Class                      isa;
-	Class                      super_class;
-	const char                *name;
-	long                       version;
-	unsigned long              info;
-	long                       instance_size;
-	struct objc_ivar_list_gcc *ivars;
-	struct objc_method_list   *methods;
-	void                      *dtable;
-	Class                      subclass_list;
-	Class                      sibling_class;
-	struct objc_protocol_list *protocols;
-	void                      *gc_object_type;
-};
-
 
 /**
  * An enumerated type describing all of the valid flags that may be used in the
diff --git a/ivar.h b/ivar.h
index 67abd0c4..1637cca0 100644
--- a/ivar.h
+++ b/ivar.h
@@ -125,7 +125,7 @@ static inline objc_ivar_ownership ivarGetOwnership(Ivar ivar)
 /**
  * Legacy ivar structure, inherited from the GCC ABI.
  */
-struct objc_ivar_gcc
+struct objc_ivar_gsv1
 {
 	/**
 	 * Name of this instance variable.
@@ -189,7 +189,7 @@ static inline struct objc_ivar *ivar_at_index(struct objc_ivar_list *l, int i)
 /**
  * Legacy version of the ivar list
  */
-struct objc_ivar_list_gcc
+struct objc_ivar_list_gsv1
 {
 	/**
 	 * The number of instance variables in this list.
@@ -199,6 +199,6 @@ struct objc_ivar_list_gcc
 	 * An array of instance variable metadata structures.  Note that this array
 	 * has count elements.
 	 */
-	struct objc_ivar_gcc ivar_list[];
+	struct objc_ivar_gsv1 ivar_list[];
 };
 
diff --git a/legacy.c b/legacy.c
index 51ae17b3..19eaee8d 100644
--- a/legacy.c
+++ b/legacy.c
@@ -66,7 +66,7 @@ static objc_ivar_ownership ownershipForIvar(struct objc_class_gsv1 *cls, int idx
 
 static struct objc_ivar_list *upgradeIvarList(struct objc_class_gsv1 *cls)
 {
-	struct objc_ivar_list_gcc *l = cls->ivars;
+	struct objc_ivar_list_gsv1 *l = cls->ivars;
 	if (l == NULL)
 	{
 		return NULL;
@@ -135,7 +135,7 @@ static struct objc_ivar_list *upgradeIvarList(struct objc_class_gsv1 *cls)
 	return n;
 }
 
-static struct objc_method_list *upgradeMethodList(struct objc_method_list_gcc *old)
+static struct objc_method_list *upgradeMethodList(struct objc_method_list_gsv1 *old)
 {
 	if (old == NULL)
 	{
@@ -367,10 +367,11 @@ PRIVATE Class objc_upgrade_class(struct objc_class_gsv1 *oldClass)
 	}
 	return cls;
 }
-PRIVATE struct objc_category *objc_upgrade_category(struct objc_category_gcc *old)
+
+PRIVATE struct objc_category *objc_upgrade_category(struct objc_category_gsv1 *old)
 {
 	struct objc_category *cat = calloc(1, sizeof(struct objc_category));
-	memcpy(cat, old, sizeof(struct objc_category_gcc));
+	memcpy(cat, old, sizeof(struct objc_category_gsv1));
 	cat->instance_methods = upgradeMethodList(old->instance_methods);
 	cat->class_methods = upgradeMethodList(old->class_methods);
 	if (cat->instance_methods != NULL)
@@ -389,7 +390,7 @@ PRIVATE struct objc_category *objc_upgrade_category(struct objc_category_gcc *ol
 }
 
 static struct objc_protocol_method_description_list*
-upgrade_protocol_method_list_gcc(struct objc_protocol_method_description_list_gcc *l)
+upgrade_protocol_method_list_gsv1(struct objc_protocol_method_description_list_gsv1 *l)
 {
 	if ((l == NULL) || (l->count == 0))
 	{
@@ -408,27 +409,6 @@ upgrade_protocol_method_list_gcc(struct objc_protocol_method_description_list_gc
 	return n;
 }
 
-PRIVATE struct objc_protocol *objc_upgrade_protocol_gcc(struct objc_protocol_gcc *p)
-{
-	// If the protocol has already been upgraded, the don't try to upgrade it twice.
-	if (p->isa == objc_getClass("ProtocolGCC"))
-	{
-		return objc_getProtocol(p->name);
-	}
-	p->isa = objc_getClass("ProtocolGCC");
-	Protocol *proto =
-		(Protocol*)class_createInstance((Class)objc_getClass("Protocol"),
-				sizeof(struct objc_protocol) - sizeof(id));
-	proto->name = p->name;
-	// Aliasing of this between the new and old structures means that when this
-	// returns these will all be updated.
-	proto->protocol_list = p->protocol_list;
-	proto->instance_methods = upgrade_protocol_method_list_gcc(p->instance_methods);
-	proto->class_methods = upgrade_protocol_method_list_gcc(p->class_methods);
-	assert(proto->isa);
-	return proto;
-}
-
 PRIVATE struct objc_protocol *objc_upgrade_protocol_gsv1(struct objc_protocol_gsv1 *p)
 {
 	// If the protocol has already been upgraded, the don't try to upgrade it twice.
@@ -439,19 +419,19 @@ PRIVATE struct objc_protocol *objc_upgrade_protocol_gsv1(struct objc_protocol_gs
 	Protocol *n =
 		(Protocol*)class_createInstance((Class)objc_getClass("Protocol"),
 				sizeof(struct objc_protocol) - sizeof(id));
-	n->instance_methods = upgrade_protocol_method_list_gcc(p->instance_methods);
+	n->instance_methods = upgrade_protocol_method_list_gsv1(p->instance_methods);
 	// Aliasing of this between the new and old structures means that when this
 	// returns these will all be updated.
 	n->name = p->name;
 	n->protocol_list = p->protocol_list;
-	n->class_methods = upgrade_protocol_method_list_gcc(p->class_methods);
+	n->class_methods = upgrade_protocol_method_list_gsv1(p->class_methods);
 	n->properties = upgradePropertyList(p->properties);
 	n->optional_properties = upgradePropertyList(p->optional_properties);
 	n->isa = objc_getClass("Protocol");
 	// We do in-place upgrading of these, because they might be referenced
 	// directly
-	p->instance_methods = (struct objc_protocol_method_description_list_gcc*)n->instance_methods;
-	p->class_methods = (struct objc_protocol_method_description_list_gcc*)n->class_methods;
+	p->instance_methods = (struct objc_protocol_method_description_list_gsv1*)n->instance_methods;
+	p->class_methods = (struct objc_protocol_method_description_list_gsv1*)n->class_methods;
 	p->properties = (struct objc_property_list_gsv1*)n->properties;
 	p->optional_properties = (struct objc_property_list_gsv1*)n->optional_properties;
 	p->isa = objc_getClass("ProtocolGSv1");
diff --git a/legacy.h b/legacy.h
index a1326195..432382b0 100644
--- a/legacy.h
+++ b/legacy.h
@@ -6,10 +6,6 @@
 #include "protocol.h"
 
 PRIVATE Class objc_upgrade_class(struct objc_class_gsv1 *oldClass);
-PRIVATE struct objc_category *objc_upgrade_category(struct objc_category_gcc *);
-
+PRIVATE struct objc_category *objc_upgrade_category(struct objc_category_gsv1 *old);
 PRIVATE struct objc_class_gsv1* objc_legacy_class_for_class(Class);
-
-PRIVATE struct objc_protocol *objc_upgrade_protocol_gcc(struct objc_protocol_gcc*);
 PRIVATE struct objc_protocol *objc_upgrade_protocol_gsv1(struct objc_protocol_gsv1*);
-
diff --git a/method.h b/method.h
index 4e2997bf..04c7912d 100644
--- a/method.h
+++ b/method.h
@@ -21,7 +21,7 @@ struct objc_method
 };
 // end: objc_method
 
-struct objc_method_gcc
+struct objc_method_gsv1
 {
 	/**
 	 * Selector used to send messages to this method.  The type encoding of
@@ -86,12 +86,12 @@ static inline struct objc_method *method_at_index(struct objc_method_list *l, in
 /**
  * Legacy version of the method list.
  */
-struct objc_method_list_gcc
+struct objc_method_list_gsv1
 {
 	/**
 	 * The next group of methods in the list.
 	 */
-	struct objc_method_list_gcc *next;
+	struct objc_method_list_gsv1 *next;
 	/**
 	 * The number of methods in this list.
 	 */
@@ -99,5 +99,5 @@ struct objc_method_list_gcc
 	/**
 	 * An array of methods.  Note that the actual size of this is count.
 	 */
-	struct objc_method_gcc methods[];
+	struct objc_method_gsv1 methods[];
 };
diff --git a/protocol.c b/protocol.c
index e0144e24..5f00befd 100644
--- a/protocol.c
+++ b/protocol.c
@@ -57,10 +57,6 @@ static id incompleteProtocolClass(void)
 	return IncompleteProtocolClass;
 }
 
-/**
- * Class used for legacy GCC protocols (`ProtocolGCC`).
- */
-static id protocol_class_gcc;
 /**
  * Class used for legacy GNUstep V1 ABI  protocols (`ProtocolGSv1`).
  */
@@ -72,10 +68,6 @@ static id protocol_class_gsv2;
 
 static BOOL init_protocol_classes(void)
 {
-	if (nil == protocol_class_gcc)
-	{
-		protocol_class_gcc = objc_getClass("ProtocolGCC");
-	}
 	if (nil == protocol_class_gsv1)
 	{
 		protocol_class_gsv1 = objc_getClass("ProtocolGSv1");
@@ -84,8 +76,7 @@ static BOOL init_protocol_classes(void)
 	{
 		protocol_class_gsv2 = objc_getClass("Protocol");
 	}
-	if ((nil == protocol_class_gcc) ||
-	    (nil == protocol_class_gsv1) ||
+	if ((nil == protocol_class_gsv1) ||
 	    (nil == protocol_class_gsv2))
 	{
 		return NO;
@@ -108,10 +99,6 @@ static BOOL protocol_hasOptionalMethodsAndProperties(struct objc_protocol *p)
 	{
 		return NO;
 	}
-	if (p->isa == protocol_class_gcc)
-	{
-		return NO;
-	}
 	return YES;
 }
 
@@ -207,8 +194,7 @@ static BOOL init_protocols(struct objc_protocol_list *protocols)
 	{
 		struct objc_protocol *aProto = protocols->list[i];
 		// Don't initialise a protocol twice
-		if ((aProto->isa == protocol_class_gcc) ||
-		    (aProto->isa == protocol_class_gsv1) ||
+		if ((aProto->isa == protocol_class_gsv1) ||
 		    (aProto->isa == protocol_class_gsv2))
 		{
 			continue;
@@ -224,12 +210,6 @@ static BOOL init_protocols(struct objc_protocol_list *protocols)
 				fprintf(stderr, "Unknown protocol version");
 				abort();
 #ifdef OLDABI_COMPAT
-			case protocol_version_gcc:
-				protocols->list[i] = objc_upgrade_protocol_gcc((struct objc_protocol_gcc *)aProto);
-				assert(aProto->isa == protocol_class_gcc);
-				assert(protocols->list[i]->isa == protocol_class_gsv2);
-				aProto = protocols->list[i];
-				break;
 			case protocol_version_gsv1:
 				protocols->list[i] = objc_upgrade_protocol_gsv1((struct objc_protocol_gsv1 *)aProto);
 				assert(aProto->isa == protocol_class_gsv1);
diff --git a/protocol.h b/protocol.h
index 15a0838a..afe98798 100644
--- a/protocol.h
+++ b/protocol.h
@@ -5,7 +5,7 @@
 #include <stdlib.h>
 #include <assert.h>
 
-struct objc_protocol_method_description_list_gcc
+struct objc_protocol_method_description_list_gsv1
 {
 	/**
 	 * Number of method descriptions in this list.
@@ -25,10 +25,6 @@ struct objc_protocol_method_description_list_gcc
  */
 enum protocol_version
 {
-	/**
-	 * Legacy (GCC-compatible) protocol version.
-	 */
-	protocol_version_gcc = 2,
 	/**
 	 * GNUstep V1 ABI protocol.
 	 */
@@ -152,11 +148,11 @@ struct objc_protocol_gcc
 	/**
 	 * List of instance methods required by this protocol.
 	 */
-	struct objc_protocol_method_description_list_gcc *instance_methods;
+	struct objc_protocol_method_description_list_gsv1 *instance_methods;
 	/**
 	 * List of class methods required by this protocol.
 	 */
-	struct objc_protocol_method_description_list_gcc *class_methods;
+	struct objc_protocol_method_description_list_gsv1 *class_methods;
 };
 
 struct objc_protocol_gsv1
@@ -167,16 +163,16 @@ struct objc_protocol_gsv1
 	id                                   isa;
 	char                                *name;
 	struct objc_protocol_list           *protocol_list;
-	struct objc_protocol_method_description_list_gcc *instance_methods;
-	struct objc_protocol_method_description_list_gcc *class_methods;
+	struct objc_protocol_method_description_list_gsv1 *instance_methods;
+	struct objc_protocol_method_description_list_gsv1 *class_methods;
 	/**
 	 * Instance methods that are declared as optional for this protocol.
 	 */
-	struct objc_protocol_method_description_list_gcc *optional_instance_methods;
+	struct objc_protocol_method_description_list_gsv1 *optional_instance_methods;
 	/**
 	 * Class methods that are declared as optional for this protocol.
 	 */
-	struct objc_protocol_method_description_list_gcc *optional_class_methods;
+	struct objc_protocol_method_description_list_gsv1 *optional_class_methods;
 	/**
 	 * Properties that are required by this protocol.
 	 */
@@ -196,9 +192,6 @@ struct objc_protocol_gsv1
 @interface Protocol : Object
 @end
 
-@interface ProtocolGCC : Protocol
-@end
-
 @interface ProtocolGSv1 : Protocol
 @end