RISC-V: Don't assume the priv attributes are in order when handling them.

There is no guarantee that the priv attributes should be defined in order.
Therefore, we shouldn't have the order assumption when handling them in the
riscv_merge_attributes.  Set priv_attrs_merged to TRUE if we have handled
all of the priv attributes.

	bfd/
	* elfnn-riscv.c (riscv_merge_attributes): Once we meet one of the
	priv attributes, we will check the conflicts for all of them (major,
	minor and revision), and then set the priv_attrs_merged to TRUE to
	indicate that we have handled all of the priv attributes.  Remove
	the unused boolean priv_may_conflict, in_priv_zero and out_priv_zero.

2 files changed, 44 insertions, 37 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index a77dd70..d9b66b5 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,11 @@
+2020-06-22  Nelson Chu  <nelson.chu@sifive.com>
+
+	* elfnn-riscv.c (riscv_merge_attributes): Once we meet one of the
+	priv attributes, we will check the conflicts for all of them (major,
+	minor and revision), and then set the priv_attrs_merged to TRUE to
+	indicate that we have handled all of the priv attributes.  Remove
+	the unused boolean priv_may_conflict, in_priv_zero and out_priv_zero.
+
 2020-06-21  Alan Modra  <amodra@gmail.com>
 
 	PR 26132
diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c
index 986e717..2804459 100644
--- a/bfd/elfnn-riscv.c
+++ b/bfd/elfnn-riscv.c
@@ -2987,9 +2987,7 @@ riscv_merge_attributes (bfd *ibfd, struct bfd_link_info *info)
   obj_attribute *in_attr;
   obj_attribute *out_attr;
   bfd_boolean result = TRUE;
-  bfd_boolean priv_may_conflict = FALSE;
-  bfd_boolean in_priv_zero = TRUE;
-  bfd_boolean out_priv_zero = TRUE;
+  bfd_boolean priv_attrs_merged = FALSE;
   const char *sec_name = get_elf_backend_data (ibfd)->obj_attrs_section;
   unsigned int i;
 
@@ -3048,41 +3046,42 @@ riscv_merge_attributes (bfd *ibfd, struct bfd_link_info *info)
       case Tag_RISCV_priv_spec:
       case Tag_RISCV_priv_spec_minor:
       case Tag_RISCV_priv_spec_revision:
-	if (in_attr[i].i != 0)
-	  in_priv_zero = FALSE;
-	if (out_attr[i].i != 0)
-	  out_priv_zero = FALSE;
-	if (out_attr[i].i != in_attr[i].i)
-	  priv_may_conflict = TRUE;
-
-	/* We check the priv version conflict when parsing the
-	   revision version.  */
-	if (i != Tag_RISCV_priv_spec_revision)
-	  break;
-
-	/* Allow to link the object without the priv setting.  */
-	if (out_priv_zero)
-	  {
-	    out_attr[i].i = in_attr[i].i;
-	    out_attr[Tag_RISCV_priv_spec].i =
-		in_attr[Tag_RISCV_priv_spec].i;
-	    out_attr[Tag_RISCV_priv_spec_minor].i =
-		in_attr[Tag_RISCV_priv_spec_minor].i;
-	  }
-	else if (!in_priv_zero
-		 && priv_may_conflict)
+	/* If we have handled the priv attributes, then skip it.  */
+	if (!priv_attrs_merged)
 	  {
-	    _bfd_error_handler
-	      (_("error: %pB use privilege spec version %u.%u.%u but "
-		 "the output use version %u.%u.%u."),
-	       ibfd,
-	       in_attr[Tag_RISCV_priv_spec].i,
-	       in_attr[Tag_RISCV_priv_spec_minor].i,
-	       in_attr[i].i,
-	       out_attr[Tag_RISCV_priv_spec].i,
-	       out_attr[Tag_RISCV_priv_spec_minor].i,
-	       out_attr[i].i);
-	    result = FALSE;
+	    unsigned int Tag_a = Tag_RISCV_priv_spec;
+	    unsigned int Tag_b = Tag_RISCV_priv_spec_minor;
+	    unsigned int Tag_c = Tag_RISCV_priv_spec_revision;
+
+	    /* Allow to link the object without the priv specs.  */
+	    if (out_attr[Tag_a].i == 0
+		&& out_attr[Tag_b].i == 0
+		&& out_attr[Tag_c].i == 0)
+	      {
+		out_attr[Tag_a].i = in_attr[Tag_a].i;
+		out_attr[Tag_b].i = in_attr[Tag_b].i;
+		out_attr[Tag_c].i = in_attr[Tag_c].i;
+	      }
+	    else if ((in_attr[Tag_a].i != 0
+		      || in_attr[Tag_b].i != 0
+		      || in_attr[Tag_c].i != 0)
+		     && (out_attr[Tag_a].i != in_attr[Tag_a].i
+			 || out_attr[Tag_b].i != in_attr[Tag_b].i
+			 || out_attr[Tag_c].i != in_attr[Tag_c].i))
+	      {
+		_bfd_error_handler
+		  (_("error: %pB use privilege spec version %u.%u.%u but "
+		     "the output use version %u.%u.%u."),
+		   ibfd,
+		   in_attr[Tag_a].i,
+		   in_attr[Tag_b].i,
+		   in_attr[Tag_c].i,
+		   out_attr[Tag_a].i,
+		   out_attr[Tag_b].i,
+		   out_attr[Tag_c].i);
+		result = FALSE;
+	      }
+	    priv_attrs_merged = TRUE;
 	  }
 	break;