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Tue, 16 Jun 2026 06:27:35 +0000 Message-ID: <5e07c7ba-81d5-4626-b1e2-2c59c9828e00@suse.de> Date: Tue, 16 Jun 2026 08:27:34 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [pushed] [gdb/build, clang] Fix ignored aligned attribute To: Pedro Alves , gdb-patches@sourceware.org References: <20260612104134.4147876-1-tdevries@suse.de> <27af1313-53fc-4de7-a707-4f24b0e51441@palves.net> Content-Language: en-US From: Tom de Vries In-Reply-To: <27af1313-53fc-4de7-a707-4f24b0e51441@palves.net> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spamd-Result: default: False [-4.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_DN_SOME(0.00)[] X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org On 6/12/26 3:26 PM, Pedro Alves wrote: > On 2026-06-12 11:41, Tom de Vries wrote: >> PR build/34279 reports a build failure with clang. >> >> This is a regression since commit 6c85ef111b0 ("[gdb] Use using instead of >> typedef"), which did: >> ... >> -typedef long __attribute__ ((__aligned__ (4))) compat_x32_clock_t; >> +using compat_x32_clock_t = long __attribute__ ((__aligned__ (4))); >> ... >> >> The problem is that clang ignores the attribute. > > FYI, this form: > > using B [[gnu::aligned (4)]] = long; > > works the same with gcc and clang. > Hi Pedro, thanks for this suggestion. I've used this approach in a follow-up patch ( https://sourceware.org/pipermail/gdb-patches/2026-June/228041.html ). Thanks, - Tom