[{"id":3687041,"web_url":"http://patchwork.ozlabs.org/comment/3687041/","msgid":"","list_archive_url":null,"date":"2026-05-06T12:38:44","subject":"Re: [PATCH] c++: Don't check for consteval-only uses inside of\n USING_STMT [PR125184]","submitter":{"id":14370,"url":"http://patchwork.ozlabs.org/api/people/14370/","name":"Marek Polacek","email":"polacek@redhat.com"},"content":"On Wed, May 06, 2026 at 10:24:50AM +0200, Jakub Jelinek wrote:\n> Hi!\n> \n> I think a USING_STMT operand shouldn't count as consteval-only use.\n> \n> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?\n\nLooks ok to me.\n \n> 2026-05-06 Jakub Jelinek \n> \n> \tPR c++/125184\n> \t* reflect.cc (check_out_of_consteval_use): Ignore USING_STMTs.\n> \n> \t* g++.dg/reflect/using3.C: New test.\n> \n> --- gcc/cp/reflect.cc.jj\t2026-05-05 09:57:59.014541622 +0200\n> +++ gcc/cp/reflect.cc\t2026-05-05 12:29:03.599363151 +0200\n> @@ -8791,6 +8791,9 @@ check_out_of_consteval_use (tree expr, b\n> if (VAR_P (expr) && DECL_DECLARED_CONSTEXPR_P (expr))\n> return false;\n> \n> + if (TREE_CODE (expr) == USING_STMT)\n> + return false;\n> +\n> hash_set pset;\n> if (tree t = cp_walk_tree (&expr, check_out_of_consteval_use_r, &pset, &pset))\n> {\n> --- gcc/testsuite/g++.dg/reflect/using3.C.jj\t2026-05-05 12:29:58.637468773 +0200\n> +++ gcc/testsuite/g++.dg/reflect/using3.C\t2026-05-05 12:30:45.345709765 +0200\n> @@ -0,0 +1,11 @@\n> +// PR c++/125184\n> +// { dg-do compile { target c++26 } }\n> +// { dg-additional-options \"-freflection\" }\n> +\n> +#include \n> +\n> +void\n> +foo ()\n> +{\n> + using std::meta::info;\n> +}\n> \n> \tJakub\n> \n\nMarek","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=fQPO5iR/;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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charset=us-ascii","Content-Disposition":"inline","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3687348,"web_url":"http://patchwork.ozlabs.org/comment/3687348/","msgid":"<26a6e05f-2e4e-4057-b960-0466e0f53669@redhat.com>","list_archive_url":null,"date":"2026-05-06T19:56:54","subject":"Re: [PATCH] c++: Don't check for consteval-only uses inside of\n USING_STMT [PR125184]","submitter":{"id":4337,"url":"http://patchwork.ozlabs.org/api/people/4337/","name":"Jason Merrill","email":"jason@redhat.com"},"content":"On 5/6/26 8:38 AM, Marek Polacek wrote:\n> On Wed, May 06, 2026 at 10:24:50AM +0200, Jakub Jelinek wrote:\n>> Hi!\n>>\n>> I think a USING_STMT operand shouldn't count as consteval-only use.\n>>\n>> Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?\n> \n> Looks ok to me.\n\nShould this be in check_out_of_consteval_use_r instead?\n\nI'm unclear on the recursion model of the walk over that function vs. \nthe call to check_out_of_consteval_use in cp_fold_immediate_r. Are we \nvisiting statements too many times?\n\n>> 2026-05-06 Jakub Jelinek \n>>\n>> \tPR c++/125184\n>> \t* reflect.cc (check_out_of_consteval_use): Ignore USING_STMTs.\n>>\n>> \t* g++.dg/reflect/using3.C: New test.\n>>\n>> --- gcc/cp/reflect.cc.jj\t2026-05-05 09:57:59.014541622 +0200\n>> +++ gcc/cp/reflect.cc\t2026-05-05 12:29:03.599363151 +0200\n>> @@ -8791,6 +8791,9 @@ check_out_of_consteval_use (tree expr, b\n>> if (VAR_P (expr) && DECL_DECLARED_CONSTEXPR_P (expr))\n>> return false;\n>> \n>> + if (TREE_CODE (expr) == USING_STMT)\n>> + return false;\n>> +\n>> hash_set pset;\n>> if (tree t = cp_walk_tree (&expr, check_out_of_consteval_use_r, &pset, &pset))\n>> {\n>> --- gcc/testsuite/g++.dg/reflect/using3.C.jj\t2026-05-05 12:29:58.637468773 +0200\n>> +++ gcc/testsuite/g++.dg/reflect/using3.C\t2026-05-05 12:30:45.345709765 +0200\n>> @@ -0,0 +1,11 @@\n>> +// PR c++/125184\n>> +// { dg-do compile { target c++26 } }\n>> +// { dg-additional-options \"-freflection\" }\n>> +\n>> +#include \n>> +\n>> +void\n>> +foo ()\n>> +{\n>> + using std::meta::info;\n>> +}\n>>\n>> \tJakub\n>>\n> \n> Marek\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=S2MSiwVQ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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