[{"id":3680067,"web_url":"http://patchwork.ozlabs.org/comment/3680067/","msgid":"","list_archive_url":null,"date":"2026-04-21T21:20:02","subject":"Re: [PATCH] c++/reflection: odr-used inline var of consteval-only\n type [PR124770]","submitter":{"id":4337,"url":"http://patchwork.ozlabs.org/api/people/4337/","name":"Jason Merrill","email":"jason@redhat.com"},"content":"On 4/21/26 4:21 PM, Marek Polacek wrote:\n> Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?\n> \n> -- >8 --\n> wrapup_namespace_globals gives errors for code like\n> \n> extern inline int i;\n> int &r = i; // odr-used inline variable is not defined\n> \n> but because we mark consteval-only vars DECL_EXTERNAL, we also wrongly\n> emit the error for:\n> \n> inline constexpr info value{};\n> static_assert(value == info{});\n> \n> where value clearly is defined. ISTM that we should check !consteval_only_p\n> before giving this error because the test where this could trigger:\n> \n> extern constexpr inline info x;\n> \n> is already ill-formed (\"declaration of 'constexpr' variable 'x' is not\n> a definition\").\n> \n> \tPR c++/124770\n> \n> gcc/cp/ChangeLog:\n> \n> \t* decl.cc (wrapup_namespace_globals): Don't give the odr-used\n> \tinline variable error for consteval-only variables.\n> \n> gcc/testsuite/ChangeLog:\n> \n> \t* g++.dg/reflect/init18.C: New test.\n> ---\n> gcc/cp/decl.cc | 6 +++++-\n> gcc/testsuite/g++.dg/reflect/init18.C | 14 ++++++++++++++\n> 2 files changed, 19 insertions(+), 1 deletion(-)\n> create mode 100644 gcc/testsuite/g++.dg/reflect/init18.C\n> \n> diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc\n> index 679a8007ca6..7837e322d17 100644\n> --- a/gcc/cp/decl.cc\n> +++ b/gcc/cp/decl.cc\n> @@ -1024,7 +1024,11 @@ wrapup_namespace_globals ()\n> \t if (VAR_P (decl)\n> \t && DECL_EXTERNAL (decl)\n> \t && DECL_INLINE_VAR_P (decl)\n> -\t && DECL_ODR_USED (decl))\n> +\t && DECL_ODR_USED (decl)\n> +\t /* We mark consteval-only vars extern, but they also have to be\n> +\t\t declared constexpr and \"extern constexpr inline info x;\" is\n> +\t\t ill-formed. */\n> +\t && !consteval_only_p (decl))\n\nWould it work to check DECL_THIS_EXTERN instead, so we're complaining \nabout an extern declaration rather than just based on the compiler \ndeciding not to emit?\n\n> \t error_at (DECL_SOURCE_LOCATION (decl),\n> \t\t \"odr-used inline variable %qD is not defined\", decl);\n> \t}\n> diff --git a/gcc/testsuite/g++.dg/reflect/init18.C b/gcc/testsuite/g++.dg/reflect/init18.C\n> new file mode 100644\n> index 00000000000..f13125be66e\n> --- /dev/null\n> +++ b/gcc/testsuite/g++.dg/reflect/init18.C\n> @@ -0,0 +1,14 @@\n> +// PR c++/124770\n> +// { dg-do compile { target c++26 } }\n> +// { dg-additional-options \"-freflection\" }\n> +\n> +using info = decltype(^^::);\n> +\n> +constexpr inline info v{};\n> +static_assert(v == info{});\n> +extern constexpr inline info v2{};\n> +static_assert(v2 == info{});\n> +constexpr inline info v3;\n> +static_assert(v3 == info{});\n> +\n> +extern constexpr inline info v4; // { dg-error \"not a definition|consteval-only\" }\n> \n> base-commit: 80958ebae3ca639c861492c2b6f2d34c9cd5ece8","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=YG/QmPi0;\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; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.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=YG/QmPi0","sourceware.org; dmarc=pass (p=quarantine dis=none)\n header.from=redhat.com","sourceware.org; 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charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","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":3680727,"web_url":"http://patchwork.ozlabs.org/comment/3680727/","msgid":"","list_archive_url":null,"date":"2026-04-22T17:36:52","subject":"Re: [PATCH] c++/reflection: odr-used inline var of consteval-only\n type [PR124770]","submitter":{"id":14370,"url":"http://patchwork.ozlabs.org/api/people/14370/","name":"Marek Polacek","email":"polacek@redhat.com"},"content":"On Tue, Apr 21, 2026 at 05:20:02PM -0400, Jason Merrill wrote:\n> On 4/21/26 4:21 PM, Marek Polacek wrote:\n> > Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?\n> > \n> > -- >8 --\n> > wrapup_namespace_globals gives errors for code like\n> > \n> > extern inline int i;\n> > int &r = i; // odr-used inline variable is not defined\n> > \n> > but because we mark consteval-only vars DECL_EXTERNAL, we also wrongly\n> > emit the error for:\n> > \n> > inline constexpr info value{};\n> > static_assert(value == info{});\n> > \n> > where value clearly is defined. ISTM that we should check !consteval_only_p\n> > before giving this error because the test where this could trigger:\n> > \n> > extern constexpr inline info x;\n> > \n> > is already ill-formed (\"declaration of 'constexpr' variable 'x' is not\n> > a definition\").\n> > \n> > \tPR c++/124770\n> > \n> > gcc/cp/ChangeLog:\n> > \n> > \t* decl.cc (wrapup_namespace_globals): Don't give the odr-used\n> > \tinline variable error for consteval-only variables.\n> > \n> > gcc/testsuite/ChangeLog:\n> > \n> > \t* g++.dg/reflect/init18.C: New test.\n> > ---\n> > gcc/cp/decl.cc | 6 +++++-\n> > gcc/testsuite/g++.dg/reflect/init18.C | 14 ++++++++++++++\n> > 2 files changed, 19 insertions(+), 1 deletion(-)\n> > create mode 100644 gcc/testsuite/g++.dg/reflect/init18.C\n> > \n> > diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc\n> > index 679a8007ca6..7837e322d17 100644\n> > --- a/gcc/cp/decl.cc\n> > +++ b/gcc/cp/decl.cc\n> > @@ -1024,7 +1024,11 @@ wrapup_namespace_globals ()\n> > \t if (VAR_P (decl)\n> > \t && DECL_EXTERNAL (decl)\n> > \t && DECL_INLINE_VAR_P (decl)\n> > -\t && DECL_ODR_USED (decl))\n> > +\t && DECL_ODR_USED (decl)\n> > +\t /* We mark consteval-only vars extern, but they also have to be\n> > +\t\t declared constexpr and \"extern constexpr inline info x;\" is\n> > +\t\t ill-formed. */\n> > +\t && !consteval_only_p (decl))\n> \n> Would it work to check DECL_THIS_EXTERN instead, so we're complaining about\n> an extern declaration rather than just based on the compiler deciding not to\n> emit?\n\nSadly, no, we'd give the error for\n\n extern constexpr inline info v2{};\n static_assert(v2 == info{});\n\nwhere the extern is I think redundant due to [basic.link]/3.2.3.\nEDG and clang++ accept that code too.\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=F+lOOOTl;\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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