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[69.118.112.187]) by smtp.gmail.com with ESMTPSA id ew19-20020a0562140ab300b006263784674esm896073qvb.14.2023.06.02.07.29.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Jun 2023 07:29:23 -0700 (PDT) To: gcc-patches@gcc.gnu.org Cc: jason@redhat.com, Patrick Palka Subject: [PATCH] c++: is_specialization_of_friend confusion [PR109923] Date: Fri, 2 Jun 2023 10:29:20 -0400 Message-ID: <20230602142920.1793173-1-ppalka@redhat.com> X-Mailer: git-send-email 2.41.0.rc1.10.g9e49351c30 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-13.8 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Patrick Palka via Gcc-patches From: Patrick Palka Reply-To: Patrick Palka Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org Sender: "Gcc-patches" Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for trunk? -- >8 -- The check for a non-template member function of a class template in is_specialization_of_friend is overbroad, and accidentally holds for a non-template hidden friend too, which causes the predicate to return true for decl = void non_templ_friend(A, A) friend_decl = void non_templ_friend(A, A) This patch refines the check appropriately. PR c++/109923 gcc/cp/ChangeLog: * pt.cc (is_specialization_of_friend): Fix overbroad check for a non-template member function of a class template. gcc/testsuite/ChangeLog: * g++.dg/template/friend79.C: New test. --- gcc/cp/pt.cc | 1 + gcc/testsuite/g++.dg/template/friend79.C | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) create mode 100644 gcc/testsuite/g++.dg/template/friend79.C diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc index 7c2a5647665..a15d1d062c6 100644 --- a/gcc/cp/pt.cc +++ b/gcc/cp/pt.cc @@ -1319,6 +1319,7 @@ is_specialization_of_friend (tree decl, tree friend_decl) of a template class, we want to check if DECL is a specialization if this. */ if (TREE_CODE (friend_decl) == FUNCTION_DECL + && DECL_CLASS_SCOPE_P (friend_decl) && DECL_TEMPLATE_INFO (friend_decl) && !DECL_USE_TEMPLATE (friend_decl)) { diff --git a/gcc/testsuite/g++.dg/template/friend79.C b/gcc/testsuite/g++.dg/template/friend79.C new file mode 100644 index 00000000000..cd2030df019 --- /dev/null +++ b/gcc/testsuite/g++.dg/template/friend79.C @@ -0,0 +1,20 @@ +// PR c++/109923 + +template +struct A { +private: + int x; + +public: + A() : x(0) { } + + friend void non_templ_friend(A val, A weird) { + val.x++; // always works + weird.x++; // { dg-error "private" } should only work when T=void + } +}; + +int main() { + non_templ_friend(A(), A()); // { dg-bogus "" } + non_templ_friend(A(), A()); // { dg-message "required from here" } +}