[{"id":3677387,"web_url":"http://patchwork.ozlabs.org/comment/3677387/","msgid":"","list_archive_url":null,"date":"2026-04-14T20:11:13","subject":"Re: [PATCH] c++: static local meta::info as &targ [PR124824]","submitter":{"id":4337,"url":"http://patchwork.ozlabs.org/api/people/4337/","name":"Jason Merrill","email":"jason@redhat.com"},"content":"On 4/14/26 3:53 PM, Patrick Palka wrote:\n> Tested on x86_64-pc-linux-gnu, does this look OK for trunk?\n> \n> -- >8 --\n> \n> We're crashing in discriminator_for_local_entity for a static local\n> meta::info variable because determine_local_discriminator is never\n> called for it from cp_finish_decl. The code path was disabled for\n> consteval-only types in the main Reflection commit r16-6808 to avoid\n> creating a varpool_node for such types.\n\nCan we avoid mangling such a decl so we never call \ndiscriminator_for_local_entity?\n\n> This patch naively restricts the get_create call itself rather than the\n> entire block so that we still call determine_local_discriminator, which\n> seems to suffice to accept the below testcase.\n> \n> \tPR c++/124824\n> \n> gcc/cp/ChangeLog:\n> \n> \t* decl.cc (cp_finish_decl): Sink !consteval_only_p check\n> \tso that we still call determine_local_discriminator for\n> \tconsteval-only types.\n> \n> gcc/testsuite/ChangeLog:\n> \n> \t* g++.dg/reflect/expr17.C: New test.\n> ---\n> gcc/cp/decl.cc | 10 +++++-----\n> gcc/testsuite/g++.dg/reflect/expr17.C | 10 ++++++++++\n> 2 files changed, 15 insertions(+), 5 deletions(-)\n> create mode 100644 gcc/testsuite/g++.dg/reflect/expr17.C\n> \n> diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc\n> index 930253d96460..23b984500444 100644\n> --- a/gcc/cp/decl.cc\n> +++ b/gcc/cp/decl.cc\n> @@ -9885,8 +9885,7 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,\n> \t variable. */\n> if (DECL_FUNCTION_SCOPE_P (decl)\n> \t && TREE_STATIC (decl)\n> -\t && !DECL_ARTIFICIAL (decl)\n> -\t && !consteval_only_p (decl))\n> +\t && !DECL_ARTIFICIAL (decl))\n> \t{\n> \t /* The variable holding an anonymous union will have had its\n> \t discriminator set in finish_anon_union, after which it's\n> @@ -9904,9 +9903,10 @@ cp_finish_decl (tree decl, tree init, bool init_const_expr_p,\n> \t walk_tree (&init, notice_forced_label_r, NULL, NULL);\n> \t add_local_decl (cfun, decl);\n> \t }\n> -\t /* And make sure it's in the symbol table for\n> -\t c_parse_final_cleanups to find. */\n> -\t varpool_node::get_create (decl);\n> +\t if (!consteval_only_p (decl))\n> +\t /* And make sure it's in the symbol table for\n> +\t c_parse_final_cleanups to find. */\n> +\t varpool_node::get_create (decl);\n> \t}\n> \n> if (flag_openmp\n> diff --git a/gcc/testsuite/g++.dg/reflect/expr17.C b/gcc/testsuite/g++.dg/reflect/expr17.C\n> new file mode 100644\n> index 000000000000..d4f04d2c4094\n> --- /dev/null\n> +++ b/gcc/testsuite/g++.dg/reflect/expr17.C\n> @@ -0,0 +1,10 @@\n> +// PR c++/124824\n> +// { dg-do compile { target c++26 } }\n> +// { dg-additional-options \"-freflection\" }\n> +\n> +template void f() { }\n> +\n> +int main() {\n> + static constexpr auto M = ^^int;\n> + f<&M>();\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=fCcLdYJ2;\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=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":3677393,"web_url":"http://patchwork.ozlabs.org/comment/3677393/","msgid":"<7dbcf830-57aa-605a-de31-5d7c89774a12@idea>","list_archive_url":null,"date":"2026-04-14T20:26:00","subject":"Re: [PATCH] c++: static local meta::info as &targ [PR124824]","submitter":{"id":78319,"url":"http://patchwork.ozlabs.org/api/people/78319/","name":"Patrick Palka","email":"ppalka@redhat.com"},"content":"On Tue, 14 Apr 2026, Jason Merrill wrote:\n\n> On 4/14/26 3:53 PM, Patrick Palka wrote:\n> > Tested on x86_64-pc-linux-gnu, does this look OK for trunk?\n> > \n> > -- >8 --\n> > \n> > We're crashing in discriminator_for_local_entity for a static local\n> > meta::info variable because determine_local_discriminator is never\n> > called for it from cp_finish_decl. The code path was disabled for\n> > consteval-only types in the main Reflection commit r16-6808 to avoid\n> > creating a varpool_node for such types.\n> \n> Can we avoid mangling such a decl so we never call\n> discriminator_for_local_entity?\n\nSince we're passing the decl's address as a template argument, I'm not\nsure how to avoid mangling it? I'd think we still need the\ndiscriminator stuff to properly handle:\n\n template void f() { }\n\n int main() {\n {\n static constexpr auto M = ^^int;\n f<&M>(); // _Z1fITnDaXadL_ZZ4mainE1MEEEvv\n }\n {\n static constexpr auto M = ^^int;\n f<&M>(); // _Z1fITnDaXadL_ZZ4mainE1M_0EEEvv, distinct from above\n }\n }\n\n\n> \n> > This patch naively restricts the get_create call itself rather than the\n> > entire block so that we still call determine_local_discriminator, which\n> > seems to suffice to accept the below testcase.\n> > \n> > \tPR c++/124824\n> > \n> > gcc/cp/ChangeLog:\n> > \n> > \t* decl.cc (cp_finish_decl): Sink !consteval_only_p check\n> > \tso that we still call determine_local_discriminator for\n> > \tconsteval-only types.\n> > \n> > gcc/testsuite/ChangeLog:\n> > \n> > \t* g++.dg/reflect/expr17.C: New test.\n> > ---\n> > gcc/cp/decl.cc | 10 +++++-----\n> > gcc/testsuite/g++.dg/reflect/expr17.C | 10 ++++++++++\n> > 2 files changed, 15 insertions(+), 5 deletions(-)\n> > create mode 100644 gcc/testsuite/g++.dg/reflect/expr17.C\n> > \n> > diff --git a/gcc/cp/decl.cc b/gcc/cp/decl.cc\n> > index 930253d96460..23b984500444 100644\n> > --- a/gcc/cp/decl.cc\n> > +++ b/gcc/cp/decl.cc\n> > @@ -9885,8 +9885,7 @@ cp_finish_decl (tree decl, tree init, bool\n> > init_const_expr_p,\n> > \t variable. */\n> > if (DECL_FUNCTION_SCOPE_P (decl)\n> > \t && TREE_STATIC (decl)\n> > -\t && !DECL_ARTIFICIAL (decl)\n> > -\t && !consteval_only_p (decl))\n> > +\t && !DECL_ARTIFICIAL (decl))\n> > \t{\n> > \t /* The variable holding an anonymous union will have had its\n> > \t discriminator set in finish_anon_union, after which it's\n> > @@ -9904,9 +9903,10 @@ cp_finish_decl (tree decl, tree init, bool\n> > init_const_expr_p,\n> > \t walk_tree (&init, notice_forced_label_r, NULL, NULL);\n> > \t add_local_decl (cfun, decl);\n> > \t }\n> > -\t /* And make sure it's in the symbol table for\n> > -\t c_parse_final_cleanups to find. */\n> > -\t varpool_node::get_create (decl);\n> > +\t if (!consteval_only_p (decl))\n> > +\t /* And make sure it's in the symbol table for\n> > +\t c_parse_final_cleanups to find. */\n> > +\t varpool_node::get_create (decl);\n> > \t}\n> > if (flag_openmp\n> > diff --git a/gcc/testsuite/g++.dg/reflect/expr17.C\n> > b/gcc/testsuite/g++.dg/reflect/expr17.C\n> > new file mode 100644\n> > index 000000000000..d4f04d2c4094\n> > --- /dev/null\n> > +++ b/gcc/testsuite/g++.dg/reflect/expr17.C\n> > @@ -0,0 +1,10 @@\n> > +// PR c++/124824\n> > +// { dg-do compile { target c++26 } }\n> > +// { dg-additional-options \"-freflection\" }\n> > +\n> > +template void f() { }\n> > +\n> > +int main() {\n> > + static constexpr auto M = ^^int;\n> > + f<&M>();\n> > +}\n> \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=DAXNU0Ic;\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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