Changes to support clang's __attribute__((objc_root_class)).

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@35412 72102866-910b-0410-8b05-ffd578937521

ChangeLog

@@ -1,3 +1,21 @@
+2012-08-16  Niels Grewe <niels.grewe@halbordnung.de>
+
+	* configure.ac: Check for objc_root_class attribute
+	* configure: Regenerate
+	* config/objc-common.g: Annotate root classes.
+	* Headers/GNUstepBase/config.h.in: Regenerate
+	* Headers/GNUstepBase/GSConfig.h.in: Add macro for root class
+	attribute availability.
+	* Headers/GNUstepBase/GSVersionMacros.h: Define GS_ROOT_CLASS
+	depending on whether the compiler supports it.
+	* Headers/Foundation/NSObject.h: Mark NSObject as a root class.
+	* Headers/Foundation/NSProxy.h: Mark NSProxy as a root class.
+	* Source/NSDistantObject: Mark GSDistantObjectPlaceholder as a
+	root class.
+	* Source/NSObject.m: Mark NSZombie as a root class.
+
+	Changes to support clang's __attribute__((objc_root_class)).
+ 	
 2012-08-10  Richard Frith-Macdonald <rfm@gnu.org>
 
         * Source/NSScanner.m: Fix error in comment

Headers/Foundation/NSObject.h

@@ -283,7 +283,7 @@ extern "C" {
 @end
 
 
-@interface NSObject <NSObject>
+GS_ROOT_CLASS @interface NSObject <NSObject>
 {
  /**
   * Points to instance's class.  Used by runtime to access method

Headers/Foundation/NSProxy.h

@@ -32,7 +32,7 @@
 extern "C" {
 #endif
 
-@interface NSProxy <NSObject>
+GS_ROOT_CLASS @interface NSProxy <NSObject>
 {
 @public
     Class	isa;

Headers/GNUstepBase/GSConfig.h.in

@@ -227,6 +227,7 @@ typedef	struct {
 #define GS_USE_MDNS @HAVE_MDNS@
 #define GS_USE_ICU @HAVE_ICU@
 #define GS_USE_LIBDISPATCH @HAVE_LIBDISPATCH@
+#define GS_HAVE_OBJC_ROOT_CLASS_ATTR @GS_HAVE_OBJC_ROOT_CLASS_ATTR@
 
 #if     defined(__WIN32__) || defined(_WIN32) || defined(__MS_WIN32__)
 #  if	!defined(__WIN32__)

Headers/GNUstepBase/GSVersionMacros.h

@@ -342,4 +342,16 @@ static inline void gs_consumed(id NS_CONSUMED __attribute__ ((unused))o) { retur
 #endif
 
 
+/*
+ * Attribute definition for root classes, annotates the interface declaration of
+ * the class.
+ */
+#ifndef GS_ROOT_CLASS
+#  if GS_HAVE_OBJC_ROOT_CLASS_ATTR || __has_feature(attribute_objc_root_class)
+#    define GS_ROOT_CLASS __attribute__((objc_root_class))
+#  else
+#    define GS_ROOT_CLASS
+#  endif
+#endif
+
 #endif /* __GNUSTEP_GSVERSIONMACROS_H_INCLUDED_ */

Headers/GNUstepBase/config.h.in

@@ -388,6 +388,9 @@
 /* Define to 1 if you have the <objc/objc.h> header file. */
 #undef HAVE_OBJC_OBJC_H
 
+/* Says whether the objc_root_class attribute works */
+#undef HAVE_OBJC_ROOT_CLASS_ATTRIBUTE
+
 /* Define to 1 if you have the <objc/runtime.h> header file. */
 #undef HAVE_OBJC_RUNTIME_H
 

Source/NSDistantObject.m

@@ -129,7 +129,7 @@ enum proxyLocation
  *	instance, we will get a pre-existing one, so we don't want to go
  *	allocating the memory for a new instance unless absolutely necessary.
  */
-@interface	GSDistantObjectPlaceHolder
+GS_ROOT_CLASS @interface	GSDistantObjectPlaceHolder
 + (id) initWithCoder: (NSCoder*)aCoder;
 + (id) initWithLocal: (id)anObject connection: (NSConnection*)aConnection;
 + (id) initWithTarget: (unsigned)target connection: (NSConnection*)aConnection;

Source/NSObject.m

@@ -108,7 +108,7 @@ static Class	NSConstantStringClass;
 @class	NSDataMalloc;
 @class	NSMutableDataMalloc;
 
-@interface	NSZombie
+GS_ROOT_CLASS @interface	NSZombie
 {
   Class	isa;
 }

config/objc-common.g

@@ -16,10 +16,17 @@
 #include <objc/hooks.h>
 #endif
 
+
+#if HAVE_OBJC_ROOT_CLASS_ATTRIBUTE
+#define GS_OBJC_ROOT_CLASS __attribute__((objc_root_class))
+#else
+#define GS_OBJC_ROOT_CLASS
+#endif
+
 /* Provide an implementation of NXConstantString for an old libobjc when
    built stand-alone without an NXConstantString implementation.  */
 #if !defined(NeXT_RUNTIME) && !defined(__GNUSTEP_RUNTIME__)
-@implementation NXConstantString
+GS_OBJC_ROOT_CLASS @implementation NXConstantString
 - (const char*) cString
 {
   return 0;
@@ -34,7 +41,7 @@
 /* Provide dummy implementations for NSObject and NSConstantString
  * for libobjc2 which needs them.
  */
-@interface NSObject
+GS_OBJC_ROOT_CLASS @interface NSObject
 { 
  id isa;
 }

configure.ac

@@ -1669,6 +1669,26 @@ AC_CHECK_LIB(rt, sched_yield)
 #--------------------------------------------------------------------
 AC_CHECK_FUNCS(nanosleep usleep Sleep)
 
+AC_MSG_CHECKING(for objc_root_class attribute support)
+saved_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Werror $OBJCFLAGS -x objective-c"
+AC_COMPILE_IFELSE([
+  __attribute__((objc_root_class)) @interface RootObject
+  @end
+  @implementation RootObject
+  @end],
+  AC_MSG_RESULT([found])
+  gs_objc_root_class_attr=1,
+  AC_MSG_RESULT([not present])
+  gs_objc_root_class_attr=0
+)
+
+GS_HAVE_OBJC_ROOT_CLASS_ATTR=$gs_objc_root_class_attr
+AC_SUBST(GS_HAVE_OBJC_ROOT_CLASS_ATTR)
+AC_DEFINE_UNQUOTED(HAVE_OBJC_ROOT_CLASS_ATTRIBUTE,$gs_objc_root_class_attr,
+  [Says whether the objc_root_class attribute works])
+CFLAGS=$saved_CFLAGS
+
 #--------------------------------------------------------------------
 # Check whether Objective-C /really/ works
 #--------------------------------------------------------------------