{"id":2225366,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2225366/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/20260420214446.565889-1-polacek@redhat.com/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/1.1/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null},"msgid":"<20260420214446.565889-1-polacek@redhat.com>","date":"2026-04-20T21:44:46","name":"c++/reflection: bogus -Wmissing-field-initializers with [PR124950]","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"e69ba5a8a16935c4c9eee92743dcc2fa30e9c82b","submitter":{"id":14370,"url":"http://patchwork.ozlabs.org/api/1.1/people/14370/?format=json","name":"Marek Polacek","email":"polacek@redhat.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/20260420214446.565889-1-polacek@redhat.com/mbox/","series":[{"id":500689,"url":"http://patchwork.ozlabs.org/api/1.1/series/500689/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=500689","date":"2026-04-20T21:44:46","name":"c++/reflection: bogus -Wmissing-field-initializers with [PR124950]","version":1,"mbox":"http://patchwork.ozlabs.org/series/500689/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2225366/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2225366/checks/","tags":{},"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=J7FRhBeM;\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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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1776721503;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding;\n bh=0r841yrDfLG0pBjzKHvtKEmDcRz4YC9CtK7jL0By/nI=;\n b=J7FRhBeMhscuTY8M6i+WvegecBKA50z39xUTE9xzMKsvlX2FJjilE6wcNw4uXpWsMZoik0\n tUaS6AqbBzG7hLwgP5OQZhLxTQkDh0tq1l+sIf6s/Kvtp2q5LBvW/LpYqBAj9az7iNOKya\n Y2WInuX1Bq0kvfw7jHgvsRE2d4PFCZE=","X-MC-Unique":"rPxk2hT3MjS6A-VMjAudOQ-1","X-Mimecast-MFC-AGG-ID":"rPxk2hT3MjS6A-VMjAudOQ_1776721499","From":"Marek Polacek ","To":"Jakub Jelinek , Jason Merrill ,\n GCC Patches , libstdc++ ,\n Jonathan Wakely ","Subject":"[PATCH] c++/reflection: bogus -Wmissing-field-initializers with\n [PR124950]","Date":"Mon, 20 Apr 2026 17:44:46 -0400","Message-ID":"<20260420214446.565889-1-polacek@redhat.com>","MIME-Version":"1.0","X-Scanned-By":"MIMEDefang 3.4.1 on 10.30.177.4","X-Mimecast-Spam-Score":"0","X-Mimecast-MFC-PROC-ID":"znyLF-_hYb5jLT0xsK5rS96y_321D-n3GGqzeHWD5JI_1776721499","X-Mimecast-Originator":"redhat.com","Content-Transfer-Encoding":"8bit","content-type":"text/plain; charset=\"US-ASCII\"; x-default=true","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"},"content":"Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?\n\n-- >8 --\nWe emit -Wmissing-field-initializers warnings for code like\n\n data_member_spec (^^int, { .name = \"dms\" })\n\nwhich seems undesirable. We can initialize the members of\nstd::meta::data_member_options to suppress that warning (clang's \nhas these initializers too).\n\n\tPR c++/124950\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/std/meta (std::meta::data_member_options): Initialize\n\tname, alignment, bit_width, and annotations members.\n\ngcc/testsuite/ChangeLog:\n\n\t* g++.dg/reflect/data_member_spec7.C: New test.\n---\n gcc/testsuite/g++.dg/reflect/data_member_spec7.C | 8 ++++++++\n libstdc++-v3/include/std/meta | 8 ++++----\n 2 files changed, 12 insertions(+), 4 deletions(-)\n create mode 100644 gcc/testsuite/g++.dg/reflect/data_member_spec7.C\n\n\nbase-commit: 416fe77efb4ff6adf39c3326d462161217b75b42","diff":"diff --git a/gcc/testsuite/g++.dg/reflect/data_member_spec7.C b/gcc/testsuite/g++.dg/reflect/data_member_spec7.C\nnew file mode 100644\nindex 00000000000..bdcdb1ee773\n--- /dev/null\n+++ b/gcc/testsuite/g++.dg/reflect/data_member_spec7.C\n@@ -0,0 +1,8 @@\n+// PR c++/124950\n+// { dg-do compile { target c++26 } }\n+// { dg-additional-options \"-freflection -Wmissing-field-initializers\" }\n+// Test that we don't emit bogus -Wmissing-field-initializers warnings.\n+\n+#include \n+using namespace std::meta;\n+constexpr auto dms = data_member_spec (^^int, { .name = \"dms\" });\ndiff --git a/libstdc++-v3/include/std/meta b/libstdc++-v3/include/std/meta\nindex 22b4da44cdd..69016a621ef 100644\n--- a/libstdc++-v3/include/std/meta\n+++ b/libstdc++-v3/include/std/meta\n@@ -423,11 +423,11 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n \tinfo _M_unused = {};\n };\n \n- optional<_Name> name;\n- optional alignment;\n- optional bit_width;\n+ optional<_Name> name = nullopt;\n+ optional alignment = nullopt;\n+ optional bit_width = nullopt;\n bool no_unique_address = false;\n- vector annotations;\n+ vector annotations = {};\n };\n consteval info data_member_spec(info, data_member_options);\n consteval bool is_data_member_spec(info);\n","prefixes":[]}