This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
[patch] Fix PR c++/27601: ICE with __builtin_offsetof for a static member
- From: Volker Reichelt <reichelt at igpm dot rwth-aachen dot de>
- To: gcc-patches at gcc dot gnu dot org
- Date: Sat, 03 Jun 2006 21:26:29 +0200 (CEST)
- Subject: [patch] Fix PR c++/27601: ICE with __builtin_offsetof for a static member
The following invalid code snippet triggers an ICE:
struct bar {
static int foo;
};
int a = __builtin_offsetof(bar, foo);
bug.cc:5: internal compiler error: in fold_offsetof_1, at c-common.c:6019
Please submit a full bug report, [etc.]
The problem is that fold_offsetof_1 does not handle static members
(VAR_DECLs). The following patch emits an appropriate error message
in this case and returns an error_mark_node to fix the ICE.
Bootstrapped and regtested on x86_64-unknown-linux-gnu.
Ok for mainline, 4.1 branch, and 4.0 branch?
Regards,
Volker
:ADDPATCH C++:
2006-06-03 Volker Reichelt <reichelt@igpm.rwth-aachen.de>
PR c++/27601
* c-common.c (fold_offsetof_1): Handle static members.
===================================================================
--- gcc/gcc/c-common.c 2006-06-03 01:27:05 +0200
+++ gcc/gcc/c-common.c 2006-06-03 01:24:59 +0200
@@ -5980,6 +5980,10 @@ fold_offsetof_1 (tree expr)
case ERROR_MARK:
return expr;
+ case VAR_DECL:
+ error ("offset taken of static member %qD", expr);
+ return error_mark_node;
+
case INDIRECT_REF:
return size_zero_node;
===================================================================
2006-06-03 Volker Reichelt <reichelt@igpm.rwth-aachen.de>
PR c++/27601
* g++.dg/ext/offsetof1.C: New test.
===================================================================
--- gcc/gcc/testsuite/g++.dg/ext/offsetof1.C 2003-09-23 19:59:22 +0200
+++ gcc/gcc/testsuite/g++.dg/ext/offsetof1.C 2006-06-03 01:32:19 +0200
@@ -0,0 +1,9 @@
+// PR c++/27601
+// Origin: Patrik Hägglund <patrik.hagglund@bredband.net>
+// { dg-do compile }
+
+struct bar {
+ static int foo;
+};
+
+int a = __builtin_offsetof(bar, foo); // { dg-error "static member" }
===================================================================