make it possible for the target to rename ".tm_clone_table"

Index: gcc/doc/tm.texi
===================================================================
--- gcc/doc/tm.texi	(revision 181611)
+++ gcc/doc/tm.texi	(working copy)
@@ -7090,6 +7090,10 @@  section names for mergeable constant data.  Define
 the string if a different section name should be used.
 @end deftypevr
 
+@deftypefn {Target Hook} {section *} TARGET_ASM_TM_CLONE_TABLE_SECTION (void)
+Return the section that should be used for transactional memory clone  tables.
+@end deftypefn
+
 @deftypefn {Target Hook} {section *} TARGET_ASM_SELECT_RTX_SECTION (enum machine_mode @var{mode}, rtx @var{x}, unsigned HOST_WIDE_INT @var{align})
 Return the section into which a constant @var{x}, of mode @var{mode},
 should be placed.  You can assume that @var{x} is some kind of
Index: gcc/doc/tm.texi.in
===================================================================
--- gcc/doc/tm.texi.in	(revision 181611)
+++ gcc/doc/tm.texi.in	(working copy)
@@ -7013,6 +7013,8 @@  otherwise.
 
 @hook TARGET_ASM_MERGEABLE_RODATA_PREFIX
 
+@hook TARGET_ASM_TM_CLONE_TABLE_SECTION
+
 @hook TARGET_ASM_SELECT_RTX_SECTION
 Return the section into which a constant @var{x}, of mode @var{mode},
 should be placed.  You can assume that @var{x} is some kind of
Index: gcc/target.def
===================================================================
--- gcc/target.def	(revision 181611)
+++ gcc/target.def	(working copy)
@@ -305,6 +305,13 @@  section names for mergeable constant data.  Define
 the string if a different section name should be used.",
  const char *, ".rodata")
 
+/* Return the section to be used for transactional memory clone tables.  */
+DEFHOOK
+(tm_clone_table_section,
+ "Return the section that should be used for transactional memory clone\
+  tables.",
+ section *, (void), default_clone_table_section)
+
 /* Output a constructor for a symbol with a given priority.  */
 DEFHOOK
 (constructor,
Index: gcc/testsuite/gcc.dg/tm/20100615.c
===================================================================
--- gcc/testsuite/gcc.dg/tm/20100615.c	(revision 181611)
+++ gcc/testsuite/gcc.dg/tm/20100615.c	(working copy)
@@ -3,7 +3,8 @@ 
 
 /* Since the non TM version of new_node() gets optimized away, it
    shouldn't appear in the clone table either.  */
-/* { dg-final { scan-assembler-not "tm_clone_table" } } */
+/* { dg-final { scan-assembler-not "tm_clone_table" { target { ! *-*-darwin*  } } } } */
+/* { dg-final { scan-assembler-not "__DATA,__tm_clone_table" { target *-*-darwin*  } } } */
 
 #define NULL 0
 extern void *malloc (__SIZE_TYPE__);
Index: gcc/varasm.c
===================================================================
--- gcc/varasm.c	(revision 181611)
+++ gcc/varasm.c	(working copy)
@@ -5961,7 +5961,7 @@  dump_tm_clone_pairs (VEC(tm_alias_pair,heap) *tm_a
 
       if (!switched)
 	{
-	  switch_to_section (get_named_section (NULL, ".tm_clone_table", 3));
+	  switch_to_section (targetm.asm_out.tm_clone_table_section ());
 	  assemble_align (POINTER_SIZE);
 	  switched = true;
 	}
@@ -5973,6 +5973,14 @@  dump_tm_clone_pairs (VEC(tm_alias_pair,heap) *tm_a
     }
 }
 
+/* Provide a default for the tm_clone_table section.  */
+
+section *
+default_clone_table_section (void)
+{
+  return get_named_section (NULL, ".tm_clone_table", 3);
+}
+
 /* Helper comparison function for qsorting by the DECL_UID stored in
    alias_pair->emitted_diags.  */
 
Index: gcc/output.h
===================================================================
--- gcc/output.h	(revision 181611)
+++ gcc/output.h	(working copy)
@@ -638,6 +638,7 @@  extern section *default_elf_select_section (tree,
 extern void default_unique_section (tree, int);
 extern section *default_function_rodata_section (tree);
 extern section *default_no_function_rodata_section (tree);
+extern section *default_clone_table_section (void);
 extern section *default_select_rtx_section (enum machine_mode, rtx,
 					    unsigned HOST_WIDE_INT);
 extern section *default_elf_select_rtx_section (enum machine_mode, rtx,
Index: gcc/config/darwin-protos.h
===================================================================
--- gcc/config/darwin-protos.h	(revision 181611)
+++ gcc/config/darwin-protos.h	(working copy)
@@ -58,6 +58,7 @@  extern int machopic_reloc_rw_mask (void);
 extern section *machopic_select_section (tree, int, unsigned HOST_WIDE_INT);
 
 extern section *darwin_function_section (tree, enum node_frequency, bool, bool); 
+extern section *darwin_tm_clone_table_section (void);
 extern void darwin_function_switched_text_sections (FILE *, tree, bool);
 
 extern void darwin_unique_section (tree decl, int reloc);
Index: gcc/config/darwin.c
===================================================================
--- gcc/config/darwin.c	(revision 181611)
+++ gcc/config/darwin.c	(working copy)
@@ -1265,6 +1265,14 @@  darwin_mergeable_constant_section (tree exp,
   return readonly_data_section;
 }
 
+section *
+darwin_tm_clone_table_section (void)
+{
+  return get_named_section (NULL,
+			    "__DATA,__tm_clone_table,regular,no_dead_strip",
+			    3);
+}
+
 int
 machopic_reloc_rw_mask (void)
 {
Index: gcc/config/darwin.h
===================================================================
--- gcc/config/darwin.h	(revision 181611)
+++ gcc/config/darwin.h	(working copy)
@@ -697,6 +696,10 @@  extern GTY(()) section * darwin_sections[NUM_DARWI
 #define TARGET_ASM_UNIQUE_SECTION darwin_unique_section
 #undef  TARGET_ASM_FUNCTION_RODATA_SECTION
 #define TARGET_ASM_FUNCTION_RODATA_SECTION default_no_function_rodata_section
+
+#undef  TARGET_ASM_TM_CLONE_TABLE_SECTION
+#define TARGET_ASM_TM_CLONE_TABLE_SECTION darwin_tm_clone_table_section
+
 #undef  TARGET_ASM_RELOC_RW_MASK
 #define TARGET_ASM_RELOC_RW_MASK machopic_reloc_rw_mask