[{"id":3681189,"web_url":"http://patchwork.ozlabs.org/comment/3681189/","msgid":"","list_archive_url":null,"date":"2026-04-22T21:23:49","subject":"Re: [16 PATCH RFA] c++: consteval, array, modules [PR124973]","submitter":{"id":671,"url":"http://patchwork.ozlabs.org/api/people/671/","name":"Jakub Jelinek","email":"jakub@redhat.com"},"content":"On Wed, Apr 22, 2026 at 05:04:36PM -0400, Jason Merrill wrote:\n> Tested x86_64-pc-linux-gnu, applying to trunk. Also OK for 16 branch, since\n> this is an ice-on-valid regression from 15?\n\nOk for 16.1 if applied before RC1 (likely Thu afternoon CEST).\n\n\tJakub","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=Y5tFIwWW;\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=Y5tFIwWW","sourceware.org; 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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 ","Reply-To":"Jakub Jelinek ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3681438,"web_url":"http://patchwork.ozlabs.org/comment/3681438/","msgid":"<9df0f39e-25cc-f9cf-22e8-718db7073df8@idea>","list_archive_url":null,"date":"2026-04-23T12:40:46","subject":"Re: [16 PATCH RFA] c++: consteval, array, modules [PR124973]","submitter":{"id":78319,"url":"http://patchwork.ozlabs.org/api/people/78319/","name":"Patrick Palka","email":"ppalka@redhat.com"},"content":"On Wed, 22 Apr 2026, Jason Merrill wrote:\n\n> Tested x86_64-pc-linux-gnu, applying to trunk. Also OK for 16 branch, since\n> this is an ice-on-valid regression from 15?\n> \n> -- 8< --\n> \n> Here the consteval holder constructor calls the defaulted element_array\n> constructor, which uses a VEC_INIT_EXPR to call the defaulted element\n> constructor.\n> \n> When we read in the holder constructor, we need to clone it, so we call\n> finish_function, which calls cp_fold_function_non_odr_use, which tries to\n> constant-evaluate the call to the element_array constructor. This\n> eventually wants to evaluate the VEC_INIT_EXPR, which wants to call the\n> element constructor (complete object clone). But we haven't cloned the\n> element constructor yet, so mark_used tries to synthesize it again, which\n> breaks because the constructor is already defined, just not cloned yet.\n> \n> We should have cloned the element constructor first, but we didn't know that\n> the element_array constructor depends on it because VEC_INIT_EXPR doesn't\n> express that; build_vec_init_expr calls build_vec_init_elt and then throws\n> it away. Perhaps we want to add the elt_init as an additional operand that\n> is used to express dependencies, but ignored in expansion?\n> \n> It would also be nice not to repeat all the finish_function passes when\n> loading a function from a module; we already did\n> cp_fold_function_non_odr_use and such for this function before writing out\n> the module, doing it again is a waste of time.\n> \n> But also, trying to constant-evaluate the element_array constructor is wrong\n> for _non_odr_use, it shouldn't be doing any optimization folding.\n> \n> Furthermore, since the TARGET_EXPR is wrapped in an INIT_EXPR, we should\n> never have tried to fold it by itself, before cp_genericize_init_expr has a\n> chance to elide it. So let's only do that folding when ff_genericize, like\n> the other TARGET_EXPR transformations. This is a much simpler fix for this\n> testcase.\n> \n> While we're at it, let's also suppress the other flag_no_inline-conditional\n> folding when ff_only_non_odr.\n> \n> \tPR c++/124973\n> \tPR c++/120502\n> \tPR c++/120005\n> \n> gcc/cp/ChangeLog:\n> \n> \t* cp-gimplify.cc (cp_fold_r) : Only\n> \tdo optimization folding when ff_genericize.\n> \t(cp_fold) : Don't do\n> \toptimization folding when ff_only_non_odr.\n> \n> gcc/testsuite/ChangeLog:\n> \n> \t* g++.dg/modules/consteval-1_a.C: New test.\n> \t* g++.dg/modules/consteval-1_b.C: New test.\n> ---\n> gcc/cp/cp-gimplify.cc | 5 ++-\n> gcc/testsuite/g++.dg/modules/consteval-1_a.C | 36 ++++++++++++++++++++\n> gcc/testsuite/g++.dg/modules/consteval-1_b.C | 8 +++++\n> 3 files changed, 48 insertions(+), 1 deletion(-)\n> create mode 100644 gcc/testsuite/g++.dg/modules/consteval-1_a.C\n> create mode 100644 gcc/testsuite/g++.dg/modules/consteval-1_b.C\n> \n> diff --git a/gcc/cp/cp-gimplify.cc b/gcc/cp/cp-gimplify.cc\n> index 5bcf5168970..8ae66405817 100644\n> --- a/gcc/cp/cp-gimplify.cc\n> +++ b/gcc/cp/cp-gimplify.cc\n> @@ -1717,7 +1717,8 @@ cp_fold_r (tree *stmt_p, int *walk_subtrees, void *data_)\n> break;\n> \n> case TARGET_EXPR:\n> - if (!flag_no_inline)\n> + if (!flag_no_inline\n> +\t && (data->flags && ff_genericize))\n\nTypo, should be & ff_genericize?\n\n> \tif (tree &init = TARGET_EXPR_INITIAL (stmt))\n> \t {\n> \t tree folded = maybe_constant_init (init, TARGET_EXPR_SLOT (stmt),\n> @@ -3769,6 +3770,7 @@ cp_fold (tree x, fold_flags_t flags)\n> \tif ((OPTION_SET_P (flag_fold_simple_inlines)\n> \t ? flag_fold_simple_inlines\n> \t : !flag_no_inline)\n> +\t && !(flags & ff_only_non_odr)\n> \t && call_expr_nargs (x) == 1\n> \t && decl_in_std_namespace_p (callee)\n> \t && DECL_NAME (callee) != NULL_TREE\n> @@ -3881,6 +3883,7 @@ cp_fold (tree x, fold_flags_t flags)\n> \t Do constexpr expansion of expressions where the call itself is not\n> \t constant, but the call followed by an INDIRECT_REF is. */\n> \tif (callee && DECL_DECLARED_CONSTEXPR_P (callee)\n> +\t && !(flags & ff_only_non_odr)\n> \t && (!flag_no_inline\n> \t\t|| lookup_attribute (\"always_inline\",\n> \t\t\t\t DECL_ATTRIBUTES (callee))))\n> diff --git a/gcc/testsuite/g++.dg/modules/consteval-1_a.C b/gcc/testsuite/g++.dg/modules/consteval-1_a.C\n> new file mode 100644\n> index 00000000000..dac678c32b1\n> --- /dev/null\n> +++ b/gcc/testsuite/g++.dg/modules/consteval-1_a.C\n> @@ -0,0 +1,36 @@\n> +// PR c++/124973\n> +// { dg-do compile { target c++20 } }\n> +// { dg-additional-options \"-fmodules\" }\n> +\n> +export module right;\t\t// { dg-module-cmi right }\n> +\n> +struct constexpr_move {\n> + constexpr_move() = default;\n> + constexpr_move(const constexpr_move&) = default;\n> + constexpr constexpr_move(constexpr_move&&) {}\n> +};\n> +\n> +struct element {\n> + constexpr_move a;\n> + int b;\n> +};\n> +\n> +template \n> +struct element_array {\n> + element data[ N ];\n> +};\n> +\n> +template \n> +struct holder {\n> + consteval holder(element_array values) :\n> + values_{static_cast&&>(values)} {}\n> + element_array values_;\n> +};\n> +\n> +template \n> +constexpr auto holder_of = holder{element_array{}};\n> +\n> +export class environment {\n> + decltype(holder_of<1>) s1_{holder_of<1>};\n> + decltype(holder_of<2>) s2_{holder_of<2>};\n> +};\n> diff --git a/gcc/testsuite/g++.dg/modules/consteval-1_b.C b/gcc/testsuite/g++.dg/modules/consteval-1_b.C\n> new file mode 100644\n> index 00000000000..14676e5dcea\n> --- /dev/null\n> +++ b/gcc/testsuite/g++.dg/modules/consteval-1_b.C\n> @@ -0,0 +1,8 @@\n> +// PR c++/124973\n> +// { dg-do compile { target c++20 } }\n> +// { dg-additional-options \"-fmodules\" }\n> +\n> +export module left;\t\t// { dg-module-cmi left }\n> +import right;\n> +\n> +export auto xx(environment&) -> void;\n> \n> base-commit: b8ac2356c691f76c19246c4c7b94c23015b8b8aa\n> -- \n> 2.53.0\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=IUFV46Mb;\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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