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[201.77.127.155]) by smtp.gmail.com with ESMTPSA id u57sm1522267qth.68.2020.01.10.12.18.26 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 10 Jan 2020 12:18:27 -0800 (PST) Sender: Renato Botelho Subject: Re: Retiring GNU objdump 2.17.50 To: Konstantin Belousov , Ed Maste Cc: FreeBSD Ports , freebsd-arch References: <20200109155610.GA23031@kib.kiev.ua> From: Renato Botelho Message-ID: Date: Fri, 10 Jan 2020 17:18:25 -0300 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:72.0) Gecko/20100101 Thunderbird/72.0 MIME-Version: 1.0 In-Reply-To: <20200109155610.GA23031@kib.kiev.ua> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 47vZ795BNSz45Zv X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=jG3p+QUc; dmarc=none; spf=pass (mx1.freebsd.org: domain of gargabsd@gmail.com designates 2607:f8b0:4864:20::744 as permitted sender) smtp.mailfrom=gargabsd@gmail.com X-Spamd-Result: default: False [-2.58 / 15.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_NEQ_ENVFROM(0.00)[garga@FreeBSD.org,gargabsd@gmail.com]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36]; RCVD_TLS_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[FreeBSD.org]; NEURAL_HAM_LONG(-1.00)[-0.999,0]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; RCVD_IN_DNSWL_NONE(0.00)[4.4.7.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.b.8.f.7.0.6.2.list.dnswl.org : 127.0.5.0]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; IP_SCORE(-0.38)[ip: (2.11), ipnet: 2607:f8b0::/32(-2.11), asn: 15169(-1.84), country: US(-0.05)]; FORGED_SENDER(0.30)[garga@FreeBSD.org,gargabsd@gmail.com]; FREEMAIL_TO(0.00)[gmail.com]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; TAGGED_FROM(0.00)[] X-BeenThere: freebsd-ports@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Porting software to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Jan 2020 20:18:30 -0000 On 09/01/20 12:56, Konstantin Belousov wrote: > On Thu, Jan 09, 2020 at 10:31:55AM -0500, Ed Maste wrote: >> We currently install and use at most three tools from GNU binutils >> 2.17.50, depending on target architecture: >> >> 1. as - assembler >> 2. ld - linker >> 3. objdump - diagnostic / information tool >> >> I hope to retire all use of these obsolete binutils before FreeBSD 13. >> Here I'd like to discuss objdump. It is a diagnostic tool that >> provides information about object files, binaries and libraries. It's >> not required as a bootstrap tool (i.e., not needed to build FreeBSD >> world or kernel). It is required to build a limited number of ports, >> and is used by some developers. >> >> I have a tracking PR for GNU objdump's retirement open in PR 229046. >> https://bugs.freebsd.org/229046. >> >> There are two ways we can proceed with its retirement: >> >> 1. Remove it without replacement. Ports that need objdump to build >> will have to depend on the binutils package/port, and users who wish >> to use it will have to install it. >> >> Related links for this path: >> Ports exp-run: https://bugs.freebsd.org/212319 >> Patch review: https://reviews.freebsd.org/D7338 >> >> 2. Install llvm-objdump in its place (perhaps via a symlink). >> llvm-objdump is broadly compatible in both command-line argument >> parsing and output format, but there are many small differences and >> it's not a full drop-in replacement. >> >> Related links for this path: >> Patch review: https://reviews.freebsd.org/D18307 >> >> I am interested in feedback on the preferred approach. Installing >> llvm's objdump has the advantage that for most use cases everything >> will "just work", but may also introduce subtle failures. > > IMO no. 1 is preferrable because we do not need to track differences, nor > we need to explain them. Having to install binutils port is not a high cost, > and if somebody needs details about binary at the level provided by objdump, > including disassembler, she would need binutils port anyway. +1 -- Renato Botelho