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* [gcc r10-9849] c++: using overloaded with local decl [PR92918]
@ 2021-05-20 21:35 Jason Merrill
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From: Jason Merrill @ 2021-05-20 21:35 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:decd38f99dd05eb54ddcaee7c52f21a56a844613
commit r10-9849-gdecd38f99dd05eb54ddcaee7c52f21a56a844613
Author: Jason Merrill <jason@redhat.com>
Date: Wed Apr 7 14:55:48 2021 -0400
c++: using overloaded with local decl [PR92918]
The problem here was that the lookup for 'impl' when parsing the template
only found the using-declaration, not the member function declaration.
This happened because when trying to add the member function declaration,
push_class_level_binding_1 saw that the current binding was a USING_DECL and
the new value is an overload, and decided to just return success.
That 'return true' dates back to r69921. In
https://gcc.gnu.org/pipermail/gcc-patches/2003-July/110632.html Nathan
mentions that we only push dependent USING_DECLs, which is no longer the
case; now that we retain more USING_DECLs, handling this case like the other
overloaded function cases seems like the obvious solution.
gcc/cp/ChangeLog:
PR c++/92918
* name-lookup.c (push_class_level_binding_1): Do overload a new
function with a previous using-declaration.
gcc/testsuite/ChangeLog:
PR c++/92918
* g++.dg/lookup/using66.C: New test.
Diff:
---
gcc/cp/name-lookup.c | 2 +-
gcc/testsuite/g++.dg/lookup/using66.C | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/gcc/cp/name-lookup.c b/gcc/cp/name-lookup.c
index 533d79542c9..f8caa16fc76 100644
--- a/gcc/cp/name-lookup.c
+++ b/gcc/cp/name-lookup.c
@@ -4552,7 +4552,7 @@ push_class_level_binding_1 (tree name, tree x)
old_decl = bval;
else if (TREE_CODE (bval) == USING_DECL
&& OVL_P (target_decl))
- return true;
+ old_decl = bval;
else if (OVL_P (target_decl)
&& OVL_P (target_bval))
old_decl = bval;
diff --git a/gcc/testsuite/g++.dg/lookup/using66.C b/gcc/testsuite/g++.dg/lookup/using66.C
new file mode 100644
index 00000000000..02383bbea3e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/lookup/using66.C
@@ -0,0 +1,23 @@
+// PR c++/92918
+// { dg-do compile { target c++11 } }
+
+struct Base03
+{
+ static void impl();
+};
+
+struct Problem : Base03
+{
+ using Base03::impl;
+ static int impl(char const *);
+
+ template <typename T>
+ auto f(const T &t) const
+ -> decltype(impl(t))
+ {
+ return impl(t);
+ }
+};
+
+Problem t;
+int i = t.f("42");
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