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[130.44.146.16]) by smtp.gmail.com with ESMTPSA id fc13-20020ad44f2d000000b0068c6fe93f45sm1374915qvb.122.2024.02.13.08.15.16 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Feb 2024 08:15:16 -0800 (PST) From: Jason Merrill To: gcc-patches@gcc.gnu.org Subject: [pushed] c++: variable partial spec redeclaration [PR113612] Date: Tue, 13 Feb 2024 11:13:58 -0500 Message-ID: <20240213161515.834255-1-jason@redhat.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-12.5 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, RCVD_IN_MSPIKE_H4, RCVD_IN_MSPIKE_WL, 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: 2.1.30 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces+ouuuleilei=gmail.com@gcc.gnu.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1790801056741646367 X-GMAIL-MSGID: 1790801056741646367 Tested x86_64-pc-linux-gnu, applying to trunk. -- 8< -- If register_specialization finds a previous declaration and throws the new one away, we shouldn't still add the new one to DECL_TEMPLATE_SPECIALIZATIONS. PR c++/113612 gcc/cp/ChangeLog: * pt.cc (process_partial_specialization): Return early on redeclaration. gcc/testsuite/ChangeLog: * g++.dg/cpp1y/var-templ85.C: New test. --- gcc/cp/pt.cc | 11 ++++++++--- gcc/testsuite/g++.dg/cpp1y/var-templ85.C | 6 ++++++ 2 files changed, 14 insertions(+), 3 deletions(-) create mode 100644 gcc/testsuite/g++.dg/cpp1y/var-templ85.C base-commit: f29f7f86935e29786bf9f976ec99d7639b381b14 diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc index 9c225c095c8..8bef2f8f6a2 100644 --- a/gcc/cp/pt.cc +++ b/gcc/cp/pt.cc @@ -5417,9 +5417,14 @@ process_partial_specialization (tree decl) } if (VAR_P (decl)) - /* We didn't register this in check_explicit_specialization so we could - wait until the constraints were set. */ - decl = register_specialization (decl, maintmpl, specargs, false, 0); + { + /* We didn't register this in check_explicit_specialization so we could + wait until the constraints were set. */ + tree reg = register_specialization (decl, maintmpl, specargs, false, 0); + if (reg != decl) + /* Redeclaration. */ + return reg; + } else associate_classtype_constraints (type); diff --git a/gcc/testsuite/g++.dg/cpp1y/var-templ85.C b/gcc/testsuite/g++.dg/cpp1y/var-templ85.C new file mode 100644 index 00000000000..33c24e0c284 --- /dev/null +++ b/gcc/testsuite/g++.dg/cpp1y/var-templ85.C @@ -0,0 +1,6 @@ +// PR c++/113612 +// { dg-do compile { target c++14 } } + +template T t; +template extern T *t; +template T *t = t;