From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id 60FD53875B5A for ; Tue, 13 Dec 2022 14:07:57 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 60FD53875B5A Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1670940476; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6D51xm9W/yt9sXGXm7+puB0Dky32Ap1qfnTSzXiclhc=; b=VqzBpjwq5Yv+gkQ8HNa2hWhfRtGbyCykbYzjiqyU0MYMHgLNuMppv9i52i6du/KVY2mMeT r1sbi2zG/RauHYUBLnX9JcpHdaQV9nT5o/bglMXk9wrbX9J50kcPy1w+guREj1WUSd7ZCU 14wyCVcWQtxmDCtig5wBVgVxKw7bSY8= Received: from mail-ej1-f72.google.com (mail-ej1-f72.google.com [209.85.218.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-191-W-sSMrF0NFyOdfq7-onhzA-1; Tue, 13 Dec 2022 09:07:55 -0500 X-MC-Unique: W-sSMrF0NFyOdfq7-onhzA-1 Received: by mail-ej1-f72.google.com with SMTP id sh37-20020a1709076ea500b007c09b177cd1so9309903ejc.12 for ; Tue, 13 Dec 2022 06:07:55 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:in-reply-to:from:cc:references:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=6D51xm9W/yt9sXGXm7+puB0Dky32Ap1qfnTSzXiclhc=; b=Q7GCb7QbRA0youg7bDY2jLfXtlADvvtIKbS2quEIqVv26JbQ8SW+nbZk2aT2XYcgBc jS3A11iLMK90LWyp8UkChDf8ETk3vqeVR6Z4PeJJaFDgjaOdldCT8Xu1Ivu7BfHtrSYY jcuD8qwO4IthcicStfR2y9JTJiCwN2Pv7XqjgHAJy7MJGJrRByzM53HBXDTkjSVdu0nB vD2wYC5PR2DoanFDCBHqiKA1pZW99QnPZ6qVDf/Mo8gGO05kwxWAbHtUH3nl0pfctLdr /q/Dlvu/wT8aE6uhYYr3QWkYdZ+ctsyUG389AoAg/Oe4JmE0WVUCn68+g588Qt1Dh6yb UtKg== X-Gm-Message-State: ANoB5pn20UDSZzOiNIP1HnzRaYKaEuavSqxCAp26/N5XXCu5JsdDQoIk IeIIjW7kZJpn5PMqfAsQdzXPkHW8zdFbhcRY2XdQerF/YEZiF0cZFuAjVusbk+dDtk3/YDsP/6n a1lTIKOiPVQyviwKrSSEWeKFBKAVsTG4s1iT2F4ibx1foPKI1F0NUOn1P3rWLLAor78mhAg== X-Received: by 2002:a17:906:c44a:b0:7c1:f63:8f66 with SMTP id ck10-20020a170906c44a00b007c10f638f66mr23574101ejb.51.1670940473673; Tue, 13 Dec 2022 06:07:53 -0800 (PST) X-Google-Smtp-Source: AA0mqf4KauOJp9akGfnBI3Y7oiD824K4ZJLqYutes8WmqyXe9Mm2LVUqCfz4PyywMkyndK2O7b8K+g== X-Received: by 2002:a17:906:c44a:b0:7c1:f63:8f66 with SMTP id ck10-20020a170906c44a00b007c10f638f66mr23574077ejb.51.1670940473348; Tue, 13 Dec 2022 06:07:53 -0800 (PST) Received: from [192.168.188.47] (dynamic-077-001-174-231.77.1.pool.telefonica.de. [77.1.174.231]) by smtp.gmail.com with ESMTPSA id ko5-20020a170907986500b007bd1ef2cccasm4585303ejc.48.2022.12.13.06.07.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 13 Dec 2022 06:07:52 -0800 (PST) Message-ID: <4d3f484e-04f9-b270-0fe7-0f44a6f861d5@redhat.com> Date: Tue, 13 Dec 2022 15:07:51 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.1 Subject: Re: [pushed] c++: build initializer_list in a loop [PR105838] To: gcc-patches@gcc.gnu.org References: <20221208184528.1657376-1-jason@redhat.com> Cc: Jason Merrill From: Stephan Bergmann In-Reply-To: <20221208184528.1657376-1-jason@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-3.3 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 08/12/2022 19:45, Jason Merrill via Gcc-patches wrote: > Tested x86_64-pc-linux-gnu, applying to trunk. Bisecting shows this started to break > $ cat test.cc > #include > template struct ConstCharArrayDetector; > template struct ConstCharArrayDetector { using Type = int; }; > struct OUString { > template OUString(T &, typename ConstCharArrayDetector::Type = 0); > }; > struct Sequence { Sequence(std::initializer_list); }; > Sequence f() { return {""}; } > $ g++ -fsyntax-only test.cc > test.cc: In function ‘Sequence f()’: > test.cc:8:26: error: no matching function for call to ‘OUString::OUString(const char* const)’ > 8 | Sequence f() { return {""}; } > | ^ > test.cc:5:26: note: candidate: ‘template OUString::OUString(T&, typename ConstCharArrayDetector::Type)’ > 5 | template OUString(T &, typename ConstCharArrayDetector::Type = 0); > | ^~~~~~~~ > test.cc:5:26: note: template argument deduction/substitution failed: > test.cc: In substitution of ‘template OUString::OUString(T&, typename ConstCharArrayDetector::Type) [with T = const char* const]’: > test.cc:8:26: required from here > test.cc:5:26: error: invalid use of incomplete type ‘struct ConstCharArrayDetector’ > test.cc:2:27: note: declaration of ‘struct ConstCharArrayDetector’ > 2 | template struct ConstCharArrayDetector; > | ^~~~~~~~~~~~~~~~~~~~~~ > test.cc:4:8: note: candidate: ‘constexpr OUString::OUString(const OUString&)’ > 4 | struct OUString { > | ^~~~~~~~ > test.cc:4:8: note: no known conversion for argument 1 from ‘const char* const’ to ‘const OUString&’ > test.cc:4:8: note: candidate: ‘constexpr OUString::OUString(OUString&&)’ > test.cc:4:8: note: no known conversion for argument 1 from ‘const char* const’ to ‘OUString&&’ > test.cc:8:26: error: conversion from ‘const char* const’ to non-scalar type ‘const OUString’ requested > 8 | Sequence f() { return {""}; } > | ^