[PATCH] Fix PR69077

[Richard Biener]

The following fixes PR69077.

LTO bootstrapped and tested on x86_64-unknown-linux-gnu, applied.

Richard.

2016-01-12  Richard Biener  <rguent...@suse.de>

        lto/
        PR lto/69077
        * lto-symtab.c (lto_symtab_prevailing_virtual_decl): Properly
        merge TREE_ADDRESSABLE and DECL_POSSIBLY_INLINED flags.

        * g++.dg/lto/pr69077_0.C: New testcase.
        * g++.dg/lto/pr69077_1.C: Likewise.

Index: gcc/lto/lto-symtab.c
===================================================================
*** gcc/lto/lto-symtab.c        (revision 232261)
--- gcc/lto/lto-symtab.c        (working copy)
*************** lto_symtab_prevailing_virtual_decl (tree
*** 997,1002 ****
--- 997,1014 ----
      n = n->next_sharing_asm_name;
    if (n)
      {
+       /* Merge decl state in both directions, we may still end up using
+        the other decl.  */
+       TREE_ADDRESSABLE (n->decl) |= TREE_ADDRESSABLE (decl);
+       TREE_ADDRESSABLE (decl) |= TREE_ADDRESSABLE (n->decl);
+ 
+       if (TREE_CODE (decl) == FUNCTION_DECL)
+       {
+         /* Merge decl state in both directions, we may still end up using
+            the other decl.  */
+         DECL_POSSIBLY_INLINED (n->decl) |= DECL_POSSIBLY_INLINED (decl);
+         DECL_POSSIBLY_INLINED (decl) |= DECL_POSSIBLY_INLINED (n->decl);
+       }
        lto_symtab_prevail_decl (n->decl, decl);
        decl = n->decl;
      }
Index: gcc/testsuite/g++.dg/lto/pr69077_0.C
===================================================================
*** gcc/testsuite/g++.dg/lto/pr69077_0.C        (revision 0)
--- gcc/testsuite/g++.dg/lto/pr69077_0.C        (working copy)
***************
*** 0 ****
--- 1,14 ----
+ // { dg-lto-do link }
+ // { dg-lto-options { { -O3 -g -flto } } }
+ // { dg-extra-ld-options "-r -nostdlib" }
+ 
+ struct cStdDev
+ {
+   long ns;
+   virtual double mean() const {  return ns;  }
+ };
+ 
+ struct cWeightedStdDev : public cStdDev {
+     virtual int netPack();
+ };
+ int cWeightedStdDev::netPack() { }
Index: gcc/testsuite/g++.dg/lto/pr69077_1.C
===================================================================
*** gcc/testsuite/g++.dg/lto/pr69077_1.C        (revision 0)
--- gcc/testsuite/g++.dg/lto/pr69077_1.C        (working copy)
***************
*** 0 ****
--- 1,15 ----
+ struct cStdDev
+ {
+   long ns;
+   virtual double mean() const {  return ns;  }
+ };
+ 
+ struct sf
+ {
+   void recordScalar(double value);
+   cStdDev eedStats;
+   virtual void finish();
+ };
+ void sf::finish() {
+     recordScalar(eedStats.mean());
+ }