re PR c++/33124 (C++ frontend should not warn about new a[0] in template context)

/cp
2007-09-16  Paolo Carlini  <pcarlini@suse.de>

	PR c++/33124
	* init.c (build_new): Remove warning for zero-element
	allocations.

/testsuite
2007-09-16  Paolo Carlini  <pcarlini@suse.de>

	PR c++/33124
	* g++.dg/warn/new1.C: Adjust.
	* g++.dg/torture/str_empty.C: Likewise.

From-SVN: r128531

gcc/cp/ChangeLog

+2007-09-16  Paolo Carlini  <pcarlini@suse.de>
+
+	PR c++/33124
+	* init.c (build_new): Remove warning for zero-element
+	allocations.
+
 2007-09-16  Nathan Sidwell  <nathan@codesourcery.com>
 
 	cp/

gcc/cp/init.c

@@ -2173,21 +2173,6 @@ build_new (tree placement, tree type, tree nelts, tree init,
       if (!build_expr_type_conversion (WANT_INT | WANT_ENUM, nelts, false))
 	pedwarn ("size in array new must have integral type");
       nelts = cp_save_expr (cp_convert (sizetype, nelts));
-      /* It is valid to allocate a zero-element array:
-
-	   [expr.new]
-
-	   When the value of the expression in a direct-new-declarator
-	   is zero, the allocation function is called to allocate an
-	   array with no elements.  The pointer returned by the
-	   new-expression is non-null.  [Note: If the library allocation
-	   function is called, the pointer returned is distinct from the
-	   pointer to any other object.]
-
-	 However, that is not generally useful, so we issue a
-	 warning.  */
-      if (integer_zerop (nelts))
-	warning (0, "allocating zero-element array");
     }
 
   /* ``A reference cannot be created by the new operator.  A reference

gcc/testsuite/ChangeLog

+2007-09-16  Paolo Carlini  <pcarlini@suse.de>
+
+	PR c++/33124
+	* g++.dg/warn/new1.C: Adjust.
+	* g++.dg/torture/str_empty.C: Likewise.
+
 2007-09-16  Richard Sandiford  <rsandifo@nildram.co.uk>
 
 	* gcc.target/mips/dse-1.c: New test.

gcc/testsuite/g++.dg/torture/str_empty.C

@@ -9,7 +9,7 @@ struct polynomial {
 
 void spline_rep1 ()
 {
-  new polynomial[0];  // { dg-warning "allocating zero-element array" }
+  new polynomial[0];  // { dg-bogus "allocating zero-element array" }
 }
 
 

gcc/testsuite/g++.dg/warn/new1.C

 void f() {
-  new int[0]; // { dg-warning "zero" }
+  new int[0]; // { dg-bogus "zero" }
 }