[PATCH] Fix PR pch/68758

["Martin Liška" <mliska@suse.cz>]

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Hello.

As mentioned in: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68758#c5, I consider
more logic to encapsulate valgrind annotation magic within a ENABLE_VALGRIND_ANNOTATIONS
macro rather than ENABLE_VALGRIND_CHECKING.

With patch applied, ggc invalid reads/writes, reported by valgrind tool, are gone.
The patch can survive regression tests and bootstrap on x86_64-linux-gnu?

Ready for trunk?
Thanks,
Martin

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From bfa1e418c8039f8f81047fc1c60c185a95a4deca Mon Sep 17 00:00:00 2001
From: marxin <mliska@suse.cz>
Date: Wed, 6 Jan 2016 13:29:33 +0100
Subject: [PATCH] Fix PR pch/68758.

gcc/ChangeLog:

2016-01-06  Martin Liska  <mliska@suse.cz>

	PR pch/68758
	* ggc-common.c (gt_pch_save): Use ENABLE_VALGRIND_ANNOTATIONS macro
	instead of ENABLE_VALGRIND_CHECKING.
---
 gcc/ggc-common.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/ggc-common.c b/gcc/ggc-common.c
index c919ba8..9b291aa 100644
--- a/gcc/ggc-common.c
+++ b/gcc/ggc-common.c
@@ -492,7 +492,7 @@ gt_pch_save (FILE *f)
 
   ggc_pch_prepare_write (state.d, state.f);
 
-#if defined ENABLE_VALGRIND_CHECKING && defined VALGRIND_GET_VBITS
+#if defined ENABLE_VALGRIND_ANNOTATIONS && defined VALGRIND_GET_VBITS
   vec<char> vbits = vNULL;
 #endif
 
@@ -504,7 +504,7 @@ gt_pch_save (FILE *f)
 	  this_object_size = state.ptrs[i]->size;
 	  this_object = XRESIZEVAR (char, this_object, this_object_size);
 	}
-#if defined ENABLE_VALGRIND_CHECKING && defined VALGRIND_GET_VBITS
+#if defined ENABLE_VALGRIND_ANNOTATIONS && defined VALGRIND_GET_VBITS
       /* obj might contain uninitialized bytes, e.g. in the trailing
 	 padding of the object.  Avoid warnings by making the memory
 	 temporarily defined and then restoring previous state.  */
@@ -561,7 +561,7 @@ gt_pch_save (FILE *f)
 			    state.ptrs[i]->note_ptr_fn == gt_pch_p_S);
       if (state.ptrs[i]->note_ptr_fn != gt_pch_p_S)
 	memcpy (state.ptrs[i]->obj, this_object, state.ptrs[i]->size);
-#if defined ENABLE_VALGRIND_CHECKING && defined VALGRIND_GET_VBITS
+#if defined ENABLE_VALGRIND_ANNOTATIONS && defined VALGRIND_GET_VBITS
       if (__builtin_expect (get_vbits == 1, 0))
 	{
 	  (void) VALGRIND_SET_VBITS (state.ptrs[i]->obj, vbits.address (),
@@ -575,7 +575,7 @@ gt_pch_save (FILE *f)
 	}
 #endif
     }
-#if defined ENABLE_VALGRIND_CHECKING && defined VALGRIND_GET_VBITS
+#if defined ENABLE_VALGRIND_ANNOTATIONS && defined VALGRIND_GET_VBITS
   vbits.release ();
 #endif
 
-- 
2.7.0