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[69.118.112.187]) by smtp.gmail.com with ESMTPSA id c9-20020ae9e209000000b0078401adad7fsm853901qkc.133.2024.01.29.12.53.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Jan 2024 12:53:02 -0800 (PST) From: Patrick Palka To: gcc-patches@gcc.gnu.org Cc: jason@redhat.com, Patrick Palka Subject: [PATCH] c++: unifying INTEGER_CST parm with type-dep arg [PR113644] Date: Mon, 29 Jan 2024 15:53:00 -0500 Message-ID: <20240129205300.2434466-1-ppalka@redhat.com> X-Mailer: git-send-email 2.43.0.440.gb50a608ba2 MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-14.3 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: 1789459572820091281 X-GMAIL-MSGID: 1789459572820091281 Bootstrapped and regtested on x86_64-pc-linux-gnu, does this look OK for trunk? -- >8 -- Here when trying to unify P=42 A=T::value we ICE due to the latter's empty type, which same_type_p dislikes. If the argument has empty type then it can't be an INTEGER_CST, so unification should fail. PR c++/113644 gcc/cp/ChangeLog: * pt.cc (unify) : Handle NULL_TREE type. gcc/testsuite/ChangeLog: * g++.dg/template/nontype30.C: New test. --- gcc/cp/pt.cc | 3 ++- gcc/testsuite/g++.dg/template/nontype30.C | 13 +++++++++++++ 2 files changed, 15 insertions(+), 1 deletion(-) create mode 100644 gcc/testsuite/g++.dg/template/nontype30.C diff --git a/gcc/cp/pt.cc b/gcc/cp/pt.cc index 74013533b0f..0d8dbc68962 100644 --- a/gcc/cp/pt.cc +++ b/gcc/cp/pt.cc @@ -24953,7 +24953,8 @@ unify (tree tparms, tree targs, tree parm, tree arg, int strict, /* Type INTEGER_CST can come from ordinary constant template args. */ case INTEGER_CST: case REAL_CST: - if (!same_type_p (TREE_TYPE (parm), TREE_TYPE (arg))) + if (TREE_TYPE (arg) == NULL_TREE + || !same_type_p (TREE_TYPE (parm), TREE_TYPE (arg))) return unify_template_argument_mismatch (explain_p, parm, arg); while (CONVERT_EXPR_P (arg)) arg = TREE_OPERAND (arg, 0); diff --git a/gcc/testsuite/g++.dg/template/nontype30.C b/gcc/testsuite/g++.dg/template/nontype30.C new file mode 100644 index 00000000000..926a7726547 --- /dev/null +++ b/gcc/testsuite/g++.dg/template/nontype30.C @@ -0,0 +1,13 @@ +// PR c++/113644 + +template struct A { }; + +template void f(A<42>); +template void f(A); + +struct B { static const int value = 42; }; + +int main() { + A<42> a; + f(a); // { dg-error "ambiguous" } +}