Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?
-- >8 --
In grokdeclarator/cdk_function the comment says that the find_xobj_parm
lambda clears TREE_PURPOSE so that we can correctly detect an xobj that
is not the first parameter. That's all good, but we should also clear
the TREE_PURPOSE once we've given the error, otherwise we crash later in
check_default_argument because the 'this' TREE_PURPOSE lacks a type.
PR c++/113389
gcc/cp/ChangeLog:
* decl.cc (grokdeclarator) <case cdk_function>: Set TREE_PURPOSE to
NULL_TREE when emitting an error.
gcc/testsuite/ChangeLog:
* g++.dg/cpp23/explicit-obj-diagnostics10.C: New test.
---
gcc/cp/decl.cc | 1 +
gcc/testsuite/g++.dg/cpp23/explicit-obj-diagnostics10.C | 8 ++++++++
2 files changed, 9 insertions(+)
create mode 100644 gcc/testsuite/g++.dg/cpp23/explicit-obj-diagnostics10.C
diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc
index 322e48dee2e..3e41fd4fa31 100644
--- a/gcc/cp/decl.cc
+++ b/gcc/cp/decl.cc
@@ -13391,6 +13391,7 @@ grokdeclarator (const cp_declarator *declarator,
if (TREE_PURPOSE (parm) != this_identifier)
continue;
bad_xobj_parm_encountered = true;
+ TREE_PURPOSE (parm) = NULL_TREE;
gcc_rich_location bad_xobj_parm
(DECL_SOURCE_LOCATION (TREE_VALUE (parm)));
error_at (&bad_xobj_parm,
diff --git a/gcc/testsuite/g++.dg/cpp23/explicit-obj-diagnostics10.C
b/gcc/testsuite/g++.dg/cpp23/explicit-obj-diagnostics10.C
new file mode 100644
index 00000000000..354823db166
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp23/explicit-obj-diagnostics10.C
@@ -0,0 +1,8 @@
+// PR c++/113389
+// { dg-do compile { target c++23 } }
+
+struct A {
+ void foo(A, this A); // { dg-error "only the first parameter" }
+ void qux(A, this A, // { dg-error "only the first parameter" }
+ this A); // { dg-error "only the first parameter" }
+};
base-commit: 4a8430c8c3abb1c2c14274105b3a621100f251a2
--
2.43.0
