[{"id":3679118,"web_url":"http://patchwork.ozlabs.org/comment/3679118/","msgid":"<117031d2-e9d6-4a81-b944-af874dec9a9c@gmx.de>","list_archive_url":null,"date":"2026-04-19T19:04:39","subject":"Re: [Patch, fortran] PR117077 - ICE due to allocatable component in\n hidden type","submitter":{"id":21263,"url":"http://patchwork.ozlabs.org/api/people/21263/","name":"Harald Anlauf","email":"anlauf@gmx.de"},"content":"Hi Paul!\n\nAm 19.04.26 um 4:11 PM schrieb Paul Richard Thomas:\n> I initially found it difficult to imagine where one might use the\n> testcase. However, the elaborated version that appears in the attached\n> patch indicates some potential uses.\n\nThis use is so creative that NAG does not like it:\n\nNAG Fortran Compiler Release 7.2(Shin-Urayasu) Build 7203\nError: pr117077.f90, line 48: Intrinsic TRANSFER of derived type \nFOO_TYPE with allocatable component\n[NAG Fortran Compiler error termination, 1 error]\n\nNevertheless, this is unrelated to the actual fix.\n\n> The fix addresses the cause of the ICE directly:\n> in fold-const.cc\n> default:\n> if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (orig))\n> return fold_build1_loc (loc, NOP_EXPR, type, arg);\n> gcc_unreachable ();\n> }\n> \n> If this condition is not met, the rhs is converted to a\n> VIEW_CONVERT_EXPR. I have taken the conservative choice of not\n> replacing the fold_convert entirely, just to prevent potential\n> regressions before the gcc-16 release.\n> \n> Regtested of FC43/x86_64 - OK for mainline?\n> \n> Paul\n\nLooks safe and good to me.\n\nThanks for the patch!\n\nHarald","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=fail (p=quarantine dis=none) header.from=gmx.de","sourceware.org; spf=pass smtp.mailfrom=m.gmane-mx.org","server2.sourceware.org;\n arc=none smtp.remote-ip=116.202.254.214"],"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 4fzJ3M2m3Cz1yGt\n\tfor ; Mon, 20 Apr 2026 05:05:18 +1000 (AEST)","from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id 785094AADCF5\n\tfor ; Sun, 19 Apr 2026 19:05:14 +0000 (GMT)","from ciao.gmane.io (ciao.gmane.io [116.202.254.214])\n by sourceware.org (Postfix) with ESMTPS id 911B14CD200F\n for ; Sun, 19 Apr 2026 19:04:48 +0000 (GMT)","from list by ciao.gmane.io with local (Exim 4.92)\n (envelope-from ) id 1wEXRm-0009xx-OL\n for gcc-patches@gcc.gnu.org; Sun, 19 Apr 2026 21:04:46 +0200"],"DKIM-Filter":["OpenDKIM Filter v2.11.0 sourceware.org 785094AADCF5","OpenDKIM Filter v2.11.0 sourceware.org 911B14CD200F"],"DMARC-Filter":"OpenDMARC Filter v1.4.2 sourceware.org 911B14CD200F","ARC-Filter":"OpenARC Filter v1.0.0 sourceware.org 911B14CD200F","ARC-Seal":"i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776625488; cv=none;\n b=YCfLCcCFBH0gqr0uEGFDGruiYRrDWfF7CHtVH3rp+rvHY09Ck5rgI8ilddMtQuq+MrgErBcR1ZCDchKU1CQxO13Svaoeu2rtAkil+y6wHBBjt8jfCCt0qW8Dv2XJRce1ubqCd6YFs6aCcXAsMGqWL1CKM0Ar5Ip4Lzv4W4UxeKk=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776625488; c=relaxed/simple;\n bh=7cFbik2l6TKpxwXDqtdN4SJrSCwRUJQFoQWanGLtISM=;\n h=To:From:Subject:Date:Message-ID:Mime-Version;\n b=Cd7pxGS3hCy8Zhql7LJT1GjQTN1H+EcMqGseVvQj5f2Q79NMfOV7gt68SYVRfmkpd8HvuVbVzu1PvGPx1SQJYySzgESgM4Of+fQNJNhgZ2+3P+4SAwrZgaD+YSR43OsNydfKER3A0tY7QGBYnEihS7QrSQPrg01TM12Mu1hUXY8=","ARC-Authentication-Results":"i=1; server2.sourceware.org","X-Injected-Via-Gmane":"http://gmane.org/","To":"gcc-patches@gcc.gnu.org","From":"Harald Anlauf ","Subject":"Re: [Patch, fortran] PR117077 - ICE due to allocatable component in\n hidden type","Date":"Sun, 19 Apr 2026 21:04:39 +0200","Message-ID":"<117031d2-e9d6-4a81-b944-af874dec9a9c@gmx.de>","References":"\n ","Mime-Version":"1.0","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"7bit","User-Agent":"Mozilla Thunderbird","Content-Language":"en-US","In-Reply-To":"\n ","Cc":"fortran@gcc.gnu.org","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":3679540,"web_url":"http://patchwork.ozlabs.org/comment/3679540/","msgid":"<8c2bad5d-fd0d-4717-99e4-5bef1cfa67a3@gmx.de>","list_archive_url":null,"date":"2026-04-20T19:28:20","subject":"Re: [Patch, fortran] PR117077 - ICE due to allocatable component in\n hidden type","submitter":{"id":21263,"url":"http://patchwork.ozlabs.org/api/people/21263/","name":"Harald Anlauf","email":"anlauf@gmx.de"},"content":"Am 19.04.26 um 9:04 PM schrieb Harald Anlauf:\n> Hi Paul!\n> \n> Am 19.04.26 um 4:11 PM schrieb Paul Richard Thomas:\n>> I initially found it difficult to imagine where one might use the\n>> testcase. However, the elaborated version that appears in the attached\n>> patch indicates some potential uses.\n> \n> This use is so creative that NAG does not like it:\n> \n> NAG Fortran Compiler Release 7.2(Shin-Urayasu) Build 7203\n> Error: pr117077.f90, line 48: Intrinsic TRANSFER of derived type \n> FOO_TYPE with allocatable component\n> [NAG Fortran Compiler error termination, 1 error]\n\nFor clarification I think NAG is wrong here. The standard has:\n\n16.9.212 TRANSFER (SOURCE, MOLD [, SIZE])\n\nDescription. Transfer physical representation.\n\n[...]\n\nSOURCE shall be a scalar or array of any type.\n\n\nWhich is obviously the case.\n\nI can imagine subtle implementation issues when the \"any\" type has\nallocatable components, maybe even nested, which would require\ndeep-copy semantics. I am not sure how this is to be interpreted\nas a transfer of physical representation in that case, unless the\nlater assignment takes care of the reallocations needed.\n\nNAG (+ one derivative I know of) seem to be the only compilers\nto reject the testcase.\n\nHarald\n\n> Nevertheless, this is unrelated to the actual fix.\n> \n>> The fix addresses the cause of the ICE directly:\n>> in fold-const.cc\n>>      default:\n>>        if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (orig))\n>> return fold_build1_loc (loc, NOP_EXPR, type, arg);\n>>        gcc_unreachable ();\n>>      }\n>>\n>> If this condition is not met, the rhs is converted to a\n>> VIEW_CONVERT_EXPR. I have taken the conservative choice of not\n>> replacing the fold_convert entirely, just to prevent potential\n>> regressions before the gcc-16 release.\n>>\n>> Regtested of FC43/x86_64 - OK for mainline?\n>>\n>> Paul\n> \n> Looks safe and good to me.\n> \n> Thanks for the patch!\n> \n> Harald\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 (2048-bit key;\n secure) header.d=gmx.de header.i=anlauf@gmx.de header.a=rsa-sha256\n header.s=s31663417 header.b=NqnCy5KY;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=38.145.34.32; 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 (2048-bit key,\n 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19.04.26 um 9:04 PM schrieb Harald Anlauf:\n> > Hi Paul!\n> >\n> > Am 19.04.26 um 4:11 PM schrieb Paul Richard Thomas:\n> >> I initially found it difficult to imagine where one might use the\n> >> testcase. However, the elaborated version that appears in the attached\n> >> patch indicates some potential uses.\n> >\n> > This use is so creative that NAG does not like it:\n> >\n> > NAG Fortran Compiler Release 7.2(Shin-Urayasu) Build 7203\n> > Error: pr117077.f90, line 48: Intrinsic TRANSFER of derived type\n> > FOO_TYPE with allocatable component\n> > [NAG Fortran Compiler error termination, 1 error]\n>\n> For clarification I think NAG is wrong here. The standard has:\n>\n> 16.9.212 TRANSFER (SOURCE, MOLD [, SIZE])\n>\n> Description. Transfer physical representation.\n>\n> [...]\n>\n> SOURCE shall be a scalar or array of any type.\n>\n>\n> Which is obviously the case.\n>\n> I can imagine subtle implementation issues when the \"any\" type has\n> allocatable components, maybe even nested, which would require\n> deep-copy semantics. I am not sure how this is to be interpreted\n> as a transfer of physical representation in that case, unless the\n> later assignment takes care of the reallocations needed.\n>\n> NAG (+ one derivative I know of) seem to be the only compilers\n> to reject the testcase.\n>\n> Harald\n>\n> > Nevertheless, this is unrelated to the actual fix.\n> >\n> >> The fix addresses the cause of the ICE directly:\n> >> in fold-const.cc\n> >> default:\n> >> if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (orig))\n> >> return fold_build1_loc (loc, NOP_EXPR, type, arg);\n> >> gcc_unreachable ();\n> >> }\n> >>\n> >> If this condition is not met, the rhs is converted to a\n> >> VIEW_CONVERT_EXPR. I have taken the conservative choice of not\n> >> replacing the fold_convert entirely, just to prevent potential\n> >> regressions before the gcc-16 release.\n> >>\n> >> Regtested of FC43/x86_64 - OK for mainline?\n> >>\n> >> Paul\n> >\n> > Looks safe and good to me.\n> >\n> > Thanks for the patch!\n> >\n> > Harald\n> >\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 (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=czxedgud;\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 (2048-bit key,\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=czxedgud","sourceware.org;\n dmarc=pass (p=none dis=none) header.from=gmail.com","sourceware.org; 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