C++ PATCH for c++/80043, ICE with PMF and -fpermissive

Submitted by Jason Merrill on March 15, 2017, 9:32 p.m.

Details

Message ID CADzB+2n-PuJHy+XVPwfZc32m5C38yzALVg1Rw_pGPkG2M0cBig@mail.gmail.com
State New
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Commit Message

Jason Merrill March 15, 2017, 9:32 p.m.
The issue here was that can_convert_bad doesn't allow this ill-formed
conversion, but instantiate_type does (with -fpermissive).  Fixed by
recognizing that case.  It might be nice to make can_convert_bad
smarter, but that doesn't seem worth the effort.

Tested x86_64-pc-linux-gnu, applying to trunk.
commit 8c545e7c3e1babf7a97e22f061953c4fa5c7871a
Author: Jason Merrill <jason@redhat.com>
Date:   Wed Mar 15 17:08:42 2017 -0400

            PR c++/80043 - ICE with -fpermissive
    
            * typeck.c (convert_for_assignment): Handle instantiate_type
            not giving an error.

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diff --git a/gcc/cp/typeck.c b/gcc/cp/typeck.c
index d111124..4e9a1c0 100644
--- a/gcc/cp/typeck.c
+++ b/gcc/cp/typeck.c
@@ -8486,7 +8486,12 @@  convert_for_assignment (tree type, tree rhs,
 		 overloaded function.  Call instantiate_type to get error
 		 messages.  */
 	      if (rhstype == unknown_type_node)
-		instantiate_type (type, rhs, tf_warning_or_error);
+		{
+		  tree r = instantiate_type (type, rhs, tf_warning_or_error);
+		  /* -fpermissive might allow this.  */
+		  if (!seen_error ())
+		    return r;
+		}
 	      else if (fndecl)
 		error ("cannot convert %qT to %qT for argument %qP to %qD",
 		       rhstype, type, parmnum, fndecl);
diff --git a/gcc/testsuite/g++.dg/parse/ptrmem7.C b/gcc/testsuite/g++.dg/parse/ptrmem7.C
new file mode 100644
index 0000000..37b2689
--- /dev/null
+++ b/gcc/testsuite/g++.dg/parse/ptrmem7.C
@@ -0,0 +1,16 @@ 
+// PR c++/80043
+// { dg-options -fpermissive }
+
+struct A
+{
+  template<int> void foo()
+  {
+    void (A::* fp)();
+    fp = A::foo<0>;		// { dg-warning "assuming pointer to member" }
+  }
+};
+
+void bar()
+{
+  A().foo<0>();
+}