Fix the build with GC enabled, export the GC symbols in all build configurations.

CMakeLists.txt

@@ -36,7 +36,6 @@ set(libobjc_C_SRCS
 	dtable.c
 	eh_personality.c
 	encoding2.c
-	gc_none.c
 	hash_table.c
 	hooks.c
 	ivar.c
@@ -114,6 +113,9 @@ if (BOEHM_GC)
 	set(CMAKE_OBJC_FLAGS "${CMAKE_OBJC_FLAGS} -fobjc-gc")
 	set(objc_LINK_FLAGS "${objc_LINK_FLAGS} ${GC_CFLAGS}")
 	add_definitions(-DENABLE_GC)
+	list(APPEND libobjc_OBJC_SRCS gc_boehm.c)
+else ()
+	list(APPEND libobjc_OBJC_SRCS gc_none.c)
 endif ()
 
 set(LEGACY_COMPAT FALSE CACHE BOOL

gc_none.c

@@ -4,6 +4,7 @@
 #include "class.h"
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 
 static id allocate_class(Class cls, size_t extraBytes)
 {
@@ -45,3 +46,75 @@ PRIVATE void enableGC(BOOL exclusive)
 	abort();
 }
 #endif
+
+void objc_set_collection_threshold(size_t threshold) {}
+void objc_set_collection_ratio(size_t ratio) {}
+void objc_collect(unsigned long options) {}
+BOOL objc_collectingEnabled(void) { return NO; }
+BOOL objc_atomicCompareAndSwapPtr(id predicate, id replacement, volatile id *objectLocation)
+{
+	return __sync_bool_compare_and_swap(objectLocation, predicate, replacement);
+}
+BOOL objc_atomicCompareAndSwapPtrBarrier(id predicate, id replacement, volatile id *objectLocation)
+{
+	return __sync_bool_compare_and_swap(objectLocation, predicate, replacement);
+}
+
+BOOL objc_atomicCompareAndSwapGlobal(id predicate, id replacement, volatile id *objectLocation)
+{
+	return objc_atomicCompareAndSwapPtr(predicate, replacement, objectLocation);
+}
+BOOL objc_atomicCompareAndSwapGlobalBarrier(id predicate, id replacement, volatile id *objectLocation)
+{
+	return objc_atomicCompareAndSwapPtr(predicate, replacement, objectLocation);
+}
+BOOL objc_atomicCompareAndSwapInstanceVariable(id predicate, id replacement, volatile id *objectLocation)
+{
+	return objc_atomicCompareAndSwapPtr(predicate, replacement, objectLocation);
+}
+BOOL objc_atomicCompareAndSwapInstanceVariableBarrier(id predicate, id replacement, volatile id *objectLocation)
+{
+	return objc_atomicCompareAndSwapPtr(predicate, replacement, objectLocation);
+}
+
+id objc_assign_strongCast(id val, id *ptr)
+{
+	*ptr = val;
+	return val;
+}
+
+id objc_assign_global(id val, id *ptr)
+{
+	*ptr = val;
+	return val;
+}
+
+id objc_assign_ivar(id val, id dest, ptrdiff_t offset)
+{
+	*(id*)((char*)dest+offset) = val;
+	return val;
+}
+
+void *objc_memmove_collectable(void *dst, const void *src, size_t size)
+{
+	return memmove(dst, src, size);
+}
+id objc_read_weak(id *location)
+{
+	return *location;
+}
+id objc_assign_weak(id value, id *location)
+{
+	*location = value;
+	return value;
+}
+id objc_allocate_object(Class cls, int extra)
+{
+	return class_createInstance(cls, extra);
+}
+
+BOOL objc_collecting_enabled(void) { return NO; }
+void objc_startCollectorThread(void) {}
+void objc_clear_stack(unsigned long options) {}
+BOOL objc_is_finalized(void *ptr) { return NO; }
+void objc_finalizeOnMainThread(Class cls) {}

objcxx_eh.cc

@@ -76,7 +76,7 @@ struct __cxa_exception
 	unexpected_handler unexpectedHandler;
 	terminate_handler terminateHandler;
 	__cxa_exception *nextException;
-	unsigned int handlerCount;
+	int handlerCount;
 	int handlerSwitchValue;
 	const char *actionRecord;
 	const char *languageSpecificData;