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C++ PATCH for c++/48212 (ICE after error on invalid constant initializer)
- From: Jason Merrill <jason at redhat dot com>
- To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
- Date: Wed, 30 Mar 2011 16:30:24 -0400
- Subject: C++ PATCH for c++/48212 (ICE after error on invalid constant initializer)
non_const_var_error wasn't considering the possibility that the variable
is unsuitable for a constant expression because its initializer is
erroneous.
Tested x86_64-pc-linux-gnu, applied to trunk and 4.6.
commit 95a1f4128e0d9fb5480f0ae83240a6d339cf012e
Author: Jason Merrill <jason@redhat.com>
Date: Wed Mar 30 16:05:52 2011 -0400
PR c++/48212
* semantics.c (non_const_var_error): Just return if DECL_INITIAL
is error_mark_node.
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 3300c3f..e444d91 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -6753,6 +6753,9 @@ non_const_var_error (tree r)
tree type = TREE_TYPE (r);
error ("the value of %qD is not usable in a constant "
"expression", r);
+ /* Avoid error cascade. */
+ if (DECL_INITIAL (r) == error_mark_node)
+ return;
if (DECL_DECLARED_CONSTEXPR_P (r))
inform (DECL_SOURCE_LOCATION (r),
"%qD used in its own initializer", r);
diff --git a/gcc/testsuite/g++.dg/cpp0x/regress/error-recovery1.C b/gcc/testsuite/g++.dg/cpp0x/regress/error-recovery1.C
new file mode 100644
index 0000000..2094d3e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/regress/error-recovery1.C
@@ -0,0 +1,9 @@
+// PR c++/48212
+// { dg-options -std=c++0x }
+
+template < bool > void
+foo ()
+{
+ const bool b =; // { dg-error "" }
+ foo < b > (); // { dg-error "constant expression" }
+};