varasm.c (output_addressed_constants): Clear reloc if both operands contain local relocations.

	* varasm.c (output_addressed_constants) [MINUS_EXPR]: Clear reloc if
	both operands contain local relocations.
	(categorize_decl_for_section): Don't use mergeable sections if
	initializer has any relocations.

	* gcc.dg/20021029-1.c: New test.
	* gcc.dg/20021029-2.c: New test.

From-SVN: r59097

gcc/ChangeLog

+2002-11-14  Jakub Jelinek  <jakub@redhat.com>
+
+	* varasm.c (output_addressed_constants) [MINUS_EXPR]: Clear reloc if
+	both operands contain local relocations.
+	(categorize_decl_for_section): Don't use mergeable sections if
+	initializer has any relocations.
+
 2002-11-14  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* gthr-vxworks.h: Fix formatting.

gcc/testsuite/ChangeLog

+2002-11-14  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.dg/20021029-1.c: New test.
+	* gcc.dg/20021029-2.c: New test.
+
 2002-11-13  John David Anglin  <dave@hiauly1.hia.nrc.ca>
 
 	* g++.dg/abi/vague1.C (dg-final): Return if target is hppa*-*-hpux*.

gcc/testsuite/gcc.dg/20021029-1.c

+/* Test whether difference of local labels doesn't force
+   variables into writable sections.  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fpic" } */
+/* { dg-final { scan-assembler-not ".data.rel.ro.local" } } */
+
+int foo (int a)
+{
+  static const int ar[] = { &&l1 - &&l1, &&l2 - &&l1 };
+  void *p = &&l1 + ar[a];
+  goto *p;
+  l1:
+    return 1;
+  l2:
+    return 2;
+}

gcc/testsuite/gcc.dg/20021029-2.c

+/* Test whether variables with relocations aren't put into
+   mergeable sections even with -fmerge-all-constants.  */
+/* { dg-do compile } */
+/* { dg-options "-O2 -fmerge-all-constants" } */
+/* { dg-final { scan-assembler-not ".rodata.cst" } } */
+
+int foo (int a)
+{
+  static void * const ar[] = { &&l2 };
+  void *p = ar[a];
+  goto *p;
+l2:
+  return 2;
+}

gcc/varasm.c

@@ -3679,7 +3679,7 @@ static int
 output_addressed_constants (exp)
      tree exp;
 {
-  int reloc = 0;
+  int reloc = 0, reloc2;
   tree tem;
 
   /* Give the front-end a chance to convert VALUE to something that
@@ -3708,11 +3708,20 @@ output_addressed_constants (exp)
       break;
 
     case PLUS_EXPR:
-    case MINUS_EXPR:
       reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
       reloc |= output_addressed_constants (TREE_OPERAND (exp, 1));
       break;
 
+    case MINUS_EXPR:
+      reloc = output_addressed_constants (TREE_OPERAND (exp, 0));
+      reloc2 = output_addressed_constants (TREE_OPERAND (exp, 1));
+      /* The difference of two local labels is computable at link time.  */
+      if (reloc == 1 && reloc2 == 1)
+	reloc = 0;
+      else
+	reloc |= reloc2;
+      break;
+
     case NOP_EXPR:
     case CONVERT_EXPR:
     case NON_LVALUE_EXPR:
@@ -5076,7 +5085,7 @@ categorize_decl_for_section (decl, reloc, shlib)
 	ret = SECCAT_DATA_REL_RO;
       else if (shlib && reloc)
 	ret = SECCAT_DATA_REL_RO_LOCAL;
-      else if (flag_merge_constants < 2)
+      else if (reloc || flag_merge_constants < 2)
 	/* C and C++ don't allow different variables to share the same
 	   location.  -fmerge-all-constants allows even that (at the
 	   expense of not conforming).  */