re PR tree-optimization/19917 (Weak const function mishandled inside loop)

	PR tree-optimization/19917
	* tree-eh.c (tree_could_trap_p): Consider calls to weak functions
	to be potentially trapping.

From-SVN: r95200

gcc/ChangeLog

+2005-02-17  Roger Sayle  <roger@eyesopen.com>
+
+	PR tree-optimization/19917
+	* tree-eh.c (tree_could_trap_p): Consider calls to weak functions
+	to be potentially trapping.
+
 2005-02-17  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* libgcc2.c, tree-vect-analyze.c: Fix comment typos.

gcc/tree-eh.c

@@ -1840,6 +1840,13 @@ tree_could_trap_p (tree expr)
 	return true;
       return false;
 
+    case CALL_EXPR:
+      t = get_callee_fndecl (expr);
+      /* Assume that calls to weak functions may trap.  */
+      if (!t || !DECL_P (t) || DECL_WEAK (t))
+	return true;
+      return false;
+
     default:
       /* Any floating arithmetic may trap.  */
       if (fp_operation && flag_trapping_math)