From patchwork Thu Jan 24 17:09:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pedro Alves X-Patchwork-Id: 31205 Received: (qmail 73465 invoked by alias); 24 Jan 2019 17:09:39 -0000 Mailing-List: contact gdb-patches-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sourceware.org Delivered-To: mailing list gdb-patches@sourceware.org Received: (qmail 73454 invoked by uid 89); 24 Jan 2019 17:09:39 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-26.9 required=5.0 tests=BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=4.8 X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Thu, 24 Jan 2019 17:09:38 +0000 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D1B8B804ED; Thu, 24 Jan 2019 17:09:36 +0000 (UTC) Received: from [127.0.0.1] (ovpn04.gateway.prod.ext.ams2.redhat.com [10.39.146.4]) by smtp.corp.redhat.com (Postfix) with ESMTP id CBC161001F3D; Thu, 24 Jan 2019 17:09:35 +0000 (UTC) Subject: Re: [PATCH v3 06/17] Replace delete_longjmp_breakpoint_cleanup with a forward_scope_exit type To: "Pavel I. Kryukov" , gdb-patches@sourceware.org References: Cc: tom@tromey.com, andrew.burgess@embecosm.com From: Pedro Alves Message-ID: Date: Thu, 24 Jan 2019 17:09:34 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: On 01/24/2019 11:23 AM, Pavel I. Kryukov wrote: > The patch causes build errors on XCode: > > $ clang --version > Apple LLVM version 10.0.0 (clang-1000.11.45.5) > Target: x86_64-apple-darwin17.7.0 > Thread model: posix > InstalledDir: /Applications/Xcode10.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin Thanks. Hmm, I only have clang 5.0.2 handy, and I think it links with libstdc++ instead of clang's own libc++. Here it builds fine. I had also made sure the patch builds fine with g++ 4.8. > > > In file included from breakpoint.c:34: > In file included from ./inferior.h:54: > ./common/forward-scope-exit.h:98:7: error: no matching constructor for > initialization of 'decltype(std::bind(&delete_longjmp_breakpoint, > std::declval()))' (aka '__bind') > : m_bind_function (std::bind (function, args...)) > ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ./common/gdb_optional.h:155:19: note: in instantiation of member > function 'detail::forward_scope_exit &delete_longjmp_breakpoint, void (int)>::forward_scope_exit' requested > here > new (&m_item) T (std::forward(args)...); > ^ > breakpoint.c:11127:18: note: in instantiation of function template > specialization 'gdb::optional &delete_longjmp_breakpoint, void (int)> >::emplace' requested > here > lj_deleter.emplace (thread); > ^ > /Applications/Xcode-10.1.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/functional:2220:7: > note: candidate constructor (the implicit copy constructor) not > viable: no known conversion from '__bind<[...], int &>' to 'const > __bind<[...], int>' for 1st argument > class __bind > ^ Hmm, references to the copy ctor. I don't really know why I ended up with a copy here. We can just pass the arguments directly to the being-constructed bind. Does this work for you? From b1caeb9c5334a59680af7b7717ab620e5a912bcf Mon Sep 17 00:00:00 2001 From: Pedro Alves Date: Thu, 24 Jan 2019 16:25:44 +0000 Subject: [PATCH] No copy ctor --- gdb/common/forward-scope-exit.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gdb/common/forward-scope-exit.h b/gdb/common/forward-scope-exit.h index 8d639151a4..bffc6e683b 100644 --- a/gdb/common/forward-scope-exit.h +++ b/gdb/common/forward-scope-exit.h @@ -95,7 +95,7 @@ class forward_scope_exit public: explicit forward_scope_exit (Args ...args) - : m_bind_function (std::bind (function, args...)) + : m_bind_function (function, args...) { /* Nothing. */ }