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[73.19.52.228]) by smtp.gmail.com with ESMTPSA id b15sm24233482pgg.90.2019.04.22.10.41.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 22 Apr 2019 10:41:57 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.8\)) Subject: Re: svn commit: r346492 - projects/runtime-coverage-v2/lib/libclang_rt From: Enji Cooper In-Reply-To: Cc: Enji Cooper , src-committers , svn-src-projects@freebsd.org Content-Transfer-Encoding: quoted-printable Message-Id: References: <201904211926.x3LJQeg2024873@repo.freebsd.org> To: John Baldwin X-Mailer: Apple Mail (2.3445.104.8) Precedence: bulk X-Loop: FreeBSD.org Sender: owner-src-committers@freebsd.org X-Rspamd-Queue-Id: 47FF56EC51 X-Spamd-Bar: ------ Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-6.97 / 15.00]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.97)[-0.975,0]; REPLY(-4.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0] Status: O X-BeenThere: svn-src-projects@freebsd.org X-Mailman-Version: 2.1.29 List-Id: "SVN commit messages for the src " projects" tree" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Date: Tue, 03 Sep 2019 14:07:23 -0000 X-Original-Date: Mon, 22 Apr 2019 10:41:56 -0700 X-List-Received-Date: Tue, 03 Sep 2019 14:07:23 -0000 > On Apr 22, 2019, at 9:22 AM, John Baldwin wrote: >=20 > On 4/21/19 12:26 PM, Enji Cooper wrote: >> Author: ngie >> Date: Sun Apr 21 19:26:40 2019 >> New Revision: 346492 >> URL: https://svnweb.freebsd.org/changeset/base/346492 >>=20 >> Log: >> Build libclang_rt/profile on all clang-supported architectures >>=20 >> There's no reason why a special case needs to be added specifically = for amd64, >> arm, and i386, as the code is written in machine architecture = agnostic C/C++. >>=20 >> There might be compilation/link time issues, but we'll find out = soon. >=20 > For a sanitizer to be useful, you need to make sure clang's FreeBSD = driver > will actually use it. clang has builtin knowledge about which = sanitizers > work on which architectures. Just building the library alone doesn't = enable > it unless you also check the driver in clang. I haven't looked to see = what > conditions clang places on the profile case, but I am familiar with = this > from working on ASAN support for mips. Totally agree. What you=E2=80=99re referring to deals more with = ASAN/MSAN/TSAN, not profile, which is gcov-compatible profiling where = counters are incremented for lines hit and used in analysis tools like = coverity/lcov. gcov can be implemented in machine architecture = independent code. Cheers! -Enji=