PR c++/42623

	* c-common.c (c_sizeof_or_alignof_type): Return error_mark_node
	for incomplete type.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@158167 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 74eb521..2b3338e 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2010-04-09  Jason Merrill  <jason@redhat.com>
 
+       PR c++/42623
+       * c-common.c (c_sizeof_or_alignof_type): Return error_mark_node
+       for incomplete type.
+
        PR c++/41788
        * stor-layout.c (finalize_record_size): Don't change TYPE_PACKED
        based on a warning flag.

diff --git a/gcc/c-common.c b/gcc/c-common.c
index 32dc21e..5772b83 100644 (file)
--- a/gcc/c-common.c
+++ b/gcc/c-common.c
@@ -4390,7 +4390,7 @@ c_sizeof_or_alignof_type (location_t loc,
       if (complain)
        error_at (loc, "invalid application of %qs to incomplete type %qT ",
                  op_name, type);
-      value = size_zero_node;
+      return error_mark_node;
     }
   else
     {

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 51895ee..ea156f6 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-04-09  Jason Merrill  <jason@redhat.com>
+
+       PR c++/42623
+       * g++.dg/template/sizeof13.C: New.
+
 2010-04-09  Kai Tietz  <kai.tietz@onevision.com>
 
        * g++.dg/other/pr35504.C: Add check for thiscall.

diff --git a/gcc/testsuite/g++.dg/template/sizeof13.C b/gcc/testsuite/g++.dg/template/sizeof13.C
new file mode 100644 (file)
index 0000000..2f4a26e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/template/sizeof13.C
@@ -0,0 +1,17 @@
+// PR c++/42623
+// We should choose f(B) because f(A<undef>) involves applying sizeof to
+// an incomplete class, so it is removed by SFINAE.
+// { dg-do link }
+
+struct undef;
+
+template <typename U, int N = sizeof(U)> struct A { A(int); };
+template <typename U> void f(A<U>);
+
+template <typename U> struct B { B(int) { } };
+template <typename U> void f(B<U>) { }
+
+int main()
+{
+  f<undef>(0);
+}