[{"id":3678848,"web_url":"http://patchwork.ozlabs.org/comment/3678848/","msgid":"<87v7dptrwo.fsf@gentoo.org>","list_archive_url":null,"date":"2026-04-17T17:31:35","subject":"Re: [PATCH 00/30] Align struct/class forward declaration with\n implementation","submitter":{"id":83216,"url":"http://patchwork.ozlabs.org/api/people/83216/","name":"Sam James","email":"sam@gentoo.org"},"content":"Torbjörn SVENSSON writes:\n\n> Hi,\n>\n> This patch series attempts to address the mix of \"struct foo\" and \"class foo\"\n> that exist thoughout the code base.\n> While it should be valid to mix them, LLVM warns that it might cause link\n> errors in Microsoft C++ ABI.\n>\n> [...]\n> This entire series does not have any functional change.\n>\n> Ok for trunk?\n\nRefactoring is definitely stage 1 material. We are very late in stage 4.","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 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 dmarc=pass (p=none dis=none) header.from=gentoo.org","sourceware.org; spf=pass smtp.mailfrom=gentoo.org","server2.sourceware.org;\n arc=none smtp.remote-ip=140.211.166.183"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fy2NG6k6hz1yDF\n\tfor ; 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a=rsa-sha256; d=sourceware.org; s=key; t=1776447101; cv=none;\n b=BUQkOpk8udyTt+OykfQBQPb7NczZQCLV8iZ2/Wjts8dEURc+Ofl0kE35zQbv+kmrEVPjQ/uzG76vekkp11asT7nqlynFLaIzW39ewNHFWiMc5jFTkgyaYnxkm4AEaTH3nZRcfxQ2o7qLGkCuhXw5eNPC9GAoKqKyQ4s6u7zs2gk=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776447101; c=relaxed/simple;\n bh=621nOKYm4m73bQJXkf4gCDNVxJYXF6QiPtRJGEF7sYQ=;\n h=From:To:Subject:Date:Message-ID:MIME-Version;\n b=mXFxLmA9bvH4qNkT1175vyvz8zjTRUPtnTeK16PiF1XgwKjKAgB/HDyEBhAqbTECzBr+7ngM6O456491U3FCO+KDYCsCIk1obBkXxtNI91Aic86QnOjnsC9fv7qFuNzT1Vv57CCaQfEevtypGnLsNNt8tB1hxdSeBsGfSzEATBg=","ARC-Authentication-Results":"i=1; server2.sourceware.org","From":"Sam James ","To":"=?utf-8?b?VG9yYmrDtnJu?= SVENSSON ","Cc":"","Subject":"Re: [PATCH 00/30] Align struct/class forward declaration with\n implementation","In-Reply-To":"<20260417172506.1015169-2-torbjorn.svensson@foss.st.com>","Organization":"Gentoo","References":"<20260417172506.1015169-2-torbjorn.svensson@foss.st.com>","User-Agent":"mu4e 1.14.0; emacs 31.0.50","Date":"Fri, 17 Apr 2026 18:31:35 +0100","Message-ID":"<87v7dptrwo.fsf@gentoo.org>","MIME-Version":"1.0","Content-Type":"multipart/signed; boundary=\"=-=-=\";\n micalg=pgp-sha512; protocol=\"application/pgp-signature\"","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":3678861,"web_url":"http://patchwork.ozlabs.org/comment/3678861/","msgid":"","list_archive_url":null,"date":"2026-04-17T18:56:31","subject":"Re: [PATCH 00/30] Align struct/class forward declaration with\n implementation","submitter":{"id":91428,"url":"http://patchwork.ozlabs.org/api/people/91428/","name":"Andrew Pinski","email":"andrew.pinski@oss.qualcomm.com"},"content":"On Fri, Apr 17, 2026 at 10:26 AM Torbjörn SVENSSON\n wrote:\n>\n> Hi,\n>\n> This patch series attempts to address the mix of \"struct foo\" and \"class foo\"\n> that exist thoughout the code base.\n> While it should be valid to mix them, LLVM warns that it might cause link\n> errors in Microsoft C++ ABI.\n>\n> After applying this serie, the following files still produces the warning:\n>\n> gt-alias.h\n> gt-arm-mve-builtins.h\n> gt-btfout.h\n> gt-c-c-decl.h\n> gt-cgraph.h\n> gt-cgraphclones.h\n> gt-cp-class.h\n> gt-cp-constexpr.h\n> gt-cp-constraint.h\n> gt-cp-contracts.h\n> gt-cp-coroutines.h\n> gt-cp-cp-gimplify.h\n> gt-cp-decl.h\n> gt-cp-decl2.h\n> gt-cp-lex.h\n> gt-cp-logic.h\n> gt-cp-module.h\n> gt-cp-name-lookup.h\n> gt-cp-pt.h\n> gt-cp-semantics.h\n> gt-cp-tree.h\n> gt-dwarf2asm.h\n> gt-dwarf2out.h\n> gt-emit-rtl.h\n> gt-except.h\n> gt-function.h\n> gt-ipa-modref.h\n> gt-ipa-prop.h\n> gt-ipa-sra.h\n> gt-optabs-libfuncs.h\n> gt-trans-mem.h\n> gt-tree-scalar-evolution.h\n> gt-tree.h\n> gt-ubsan.h\n> gt-varasm.h\n> gtype-desc.cc\n>\n>\n> I belive that all the above files are generated by the 'gengtype' program\n> during the build, but I've not found an easy way to fix it.\n> Currently, the gengtype program consider class and struct to be identical\n> keywords, but acoording to the LLVM warning, they are not.\n\nThey are valid thing to do for C++, except it looks like a\nnon-compliant C++ compiler can cause differences. I am not sure we\nwant to support a non C++14 compiler.\nWe did add this warning (but it causes GC issues and it is NOT enabled\nby default).\nThat being said I think instead we should remove the tag in most\nplaces. And that can/should be done separately from the fixup of the\nplaces where struct/class tags do need to stay/change.\n\nThanks,\nAndrea\n\n> As I see it, there are two possible ways to address the remaning warnings.\n> a) Change all usage of 'struct' to 'class' for the types that are tagged with\n> GTY.\n> b) Split out classes from structs in gengtype and generate 'class' for classes\n> and 'struct' for structs.\n>\n> Anyway, gengtype can be addressed at a later time.\n>\n> Regtested on top of r16-8473-g5cc0ead3625fe6 with arm-none-eabi using a GCC\n> built Linux hosted toolchain and a LLVM built macOS hosted toolchain.\n>\n> This entire series does not have any functional change.\n>\n> Ok for trunk?\n>\n> Kind regards,\n> Torbjörn\n>\n>\n> Torbjörn SVENSSON (30):\n> Change `struct alloca_type_and_limit` to `class alloca_type_and_limit`\n> to align tags\n> Change `struct cgraph_edge` to `class cgraph_edge` to align tags\n> Change `struct data_in` to `class data_in` to align tags\n> Change `struct gori_stmt_info` to `class gori_stmt_info` to align tags\n> Change `struct loop` to `class loop` to align tags\n> Change `struct lto_input_block` to `class lto_input_block` to align\n> tags\n> Change `struct mkdeps` to `class mkdeps` to align tags\n> Change `struct object_allocator` to `class object_allocator` to align\n> tags\n> Change `struct tree_niter_desc` to `class tree_niter_desc` to align\n> tags\n> Change `struct vrange_storage` to `class vrange_storage` to align tags\n> Change `class access_data` to `struct access_data` to align tags\n> Change `class bounded_ranges` to `struct bounded_ranges` to align tags\n> Change `class byte_range` to `struct byte_range` to align tags\n> Change `class cpp_char_column_policy` to `struct\n> cpp_char_column_policy` to align tags\n> Change `class dump_widget_info` to `struct dump_widget_info` to align\n> tags\n> Change `class element` to `struct element` to align tags\n> Change `class escape_summary` to `struct escape_summary` to align tags\n> Change `class graph` to `struct graph` to align tags\n> Change `class ipcp_transformation` to `struct ipcp_transformation` to\n> align tags\n> Change `class ipa_jump_func` to `struct ipa_jump_func` to align tags\n> Change `class ipa_vr` to `struct ipa_vr` to align tags\n> Change `class lto_simple_output_block` to `struct\n> lto_simple_output_block` to align tags\n> Change `class modref_summary` to `struct modref_summary` to align tags\n> Change `class modref_summary_lto` to `struct modref_summary_lto` to\n> align tags\n> Change `class node` to `struct node` to align tags\n> Change `class odr_enum` to `struct odr_enum` to align tags\n> Change `class real_value` to `struct real_value` to align tags\n> Change `class deallocator` to `struct deallocator` to align tags\n> Change `class deallocator_set` to `struct deallocator_set` to align\n> tags\n> Change `class redirection_data` to `struct redirection_data` to align\n> tags\n>\n> gcc/analyzer/common.h | 2 +-\n> gcc/analyzer/sm-malloc.cc | 4 +-\n> gcc/analyzer/store.h | 2 +-\n> gcc/auto-profile.cc | 6 +--\n> gcc/auto-profile.h | 2 +-\n> gcc/cfg.cc | 2 +-\n> gcc/cgraph.cc | 2 +-\n> gcc/cgraph.h | 8 +--\n> gcc/config/arm/arm.cc | 4 +-\n> gcc/config/rs6000/rs6000.cc | 6 +--\n> gcc/config/s390/s390.cc | 6 +--\n> gcc/coretypes.h | 2 +-\n> gcc/diagnostics/digraphs.h | 2 +-\n> gcc/diagnostics/state-graphs.h | 2 +-\n> gcc/except.cc | 2 +-\n> gcc/fwprop.cc | 6 +--\n> gcc/gimple-iterator.cc | 2 +-\n> gcc/gimple-range-gori.cc | 4 +-\n> gcc/gimple-ssa-warn-access.h | 3 +-\n> gcc/gimple-ssa-warn-alloca.cc | 2 +-\n> gcc/graphite-isl-ast-to-gimple.cc | 6 +--\n> gcc/graphite-scop-detection.cc | 4 +-\n> gcc/graphviz.h | 2 +-\n> gcc/inchash.h | 2 +-\n> gcc/input.h | 2 +-\n> gcc/ipa-comdats.cc | 4 +-\n> gcc/ipa-cp.cc | 54 ++++++++++----------\n> gcc/ipa-devirt.cc | 4 +-\n> gcc/ipa-fnsummary.cc | 50 +++++++++----------\n> gcc/ipa-fnsummary.h | 8 +--\n> gcc/ipa-icf.cc | 4 +-\n> gcc/ipa-inline-analysis.cc | 22 ++++-----\n> gcc/ipa-inline-transform.cc | 14 +++---\n> gcc/ipa-inline.cc | 82 +++++++++++++++----------------\n> gcc/ipa-inline.h | 24 ++++-----\n> gcc/ipa-locality-cloning.cc | 12 ++---\n> gcc/ipa-modref-tree.cc | 2 +-\n> gcc/ipa-modref-tree.h | 2 +-\n> gcc/ipa-modref.cc | 26 +++++-----\n> gcc/ipa-profile.cc | 10 ++--\n> gcc/ipa-prop.cc | 70 +++++++++++++-------------\n> gcc/ipa-prop.h | 20 ++++----\n> gcc/ipa-pure-const.cc | 14 +++---\n> gcc/ipa-reference.cc | 4 +-\n> gcc/ipa-sra.cc | 10 ++--\n> gcc/ipa-utils.cc | 18 +++----\n> gcc/ipa-utils.h | 10 ++--\n> gcc/ipa-visibility.cc | 2 +-\n> gcc/ipa.cc | 8 +--\n> gcc/lto-cgraph.cc | 22 ++++-----\n> gcc/lto-streamer-in.cc | 6 +--\n> gcc/lto/lto-partition.cc | 6 +--\n> gcc/lto/lto-symtab.cc | 2 +-\n> gcc/optc-save-gen.awk | 4 +-\n> gcc/passes.cc | 2 +-\n> gcc/predict.cc | 6 +--\n> gcc/symtab-thunks.h | 2 +-\n> gcc/text-art/tree-widget.h | 2 +-\n> gcc/trans-mem.cc | 8 +--\n> gcc/tree-cfgcleanup.cc | 2 +-\n> gcc/tree-core.h | 2 +-\n> gcc/tree-inline.cc | 14 +++---\n> gcc/tree-inline.h | 2 +-\n> gcc/tree-ssa-loop-ivopts.cc | 4 +-\n> gcc/tree-ssa-loop-split.cc | 32 ++++++------\n> gcc/tree-ssa-reassoc.cc | 2 +-\n> gcc/tree-ssa-threadupdate.h | 2 +-\n> gcc/tree-vect-loop.cc | 2 +-\n> gcc/tree-vect-slp.cc | 8 +--\n> gcc/tree-vectorizer.cc | 2 +-\n> gcc/xml-printer.h | 4 +-\n> libcpp/include/mkdeps.h | 8 +--\n> libcpp/mkdeps.cc | 8 +--\n> 73 files changed, 355 insertions(+), 356 deletions(-)\n>\n> --\n> 2.43.0\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 (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=co9i0dfI;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google 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