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Fri, 12 Jun 2026 07:24:31 -0600 From: Tom Tromey To: Tom de Vries Cc: gdb-patches@sourceware.org Subject: Re: [pushed] [gdb/build, clang] Fix ignored aligned attribute In-Reply-To: <20260612104134.4147876-1-tdevries@suse.de> (Tom de Vries's message of "Fri, 12 Jun 2026 12:41:34 +0200") References: <20260612104134.4147876-1-tdevries@suse.de> X-Attribution: Tom Date: Fri, 12 Jun 2026 07:24:30 -0600 Message-ID: <874ij7evsh.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box5379.bluehost.com X-AntiAbuse: Original Domain - sourceware.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tromey.com X-BWhitelist: no X-Source-IP: 75.166.225.82 X-Source-L: No X-Exim-ID: 1wY1s7-00000000Yji-1Ts7 X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 75-166-225-82.hlrn.qwest.net (bapiya) [75.166.225.82]:48852 X-Source-Auth: tom+tromey.com X-Email-Count: 2 X-Org: HG=bhshared;ORG=bluehost; X-Source-Cap: ZWx5bnJvYmk7ZWx5bnJvYmk7Ym94NTM3OS5ibHVlaG9zdC5jb20= X-Local-Domain: yes X-CMAE-Envelope: MS4xfHtqQWmTILN5knesuFirbb8szAen4UxFO4RwHkunD4OVpJc+YXcs/scITH8nF9vZA3PQHXyRWREx+TnklIpl1URwe+I2XKDLVbtu7lE/TO9Cs4p84qUN 9s0pCbxWvFUHv4RBA5l65QPUUJ/FRFQieBha4Sfn68YDOSb9iSz7Awt9lZTh1lsqOGE8LrFqvCza3u/X5MTua3cCG47yrTCgLrY= 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 >>>>> "Tom" == Tom de Vries writes: Tom> PR build/34279 reports a build failure with clang. Tom> This is a regression since commit 6c85ef111b0 ("[gdb] Use using instead of Tom> typedef"), which did: Tom> ... Tom> -typedef long __attribute__ ((__aligned__ (4))) compat_x32_clock_t; Tom> +using compat_x32_clock_t = long __attribute__ ((__aligned__ (4))); Tom> ... Tom> The problem is that clang ignores the attribute. Very surprising. Tom> /* For x32, clock_t in _sigchld is 64bit aligned at 4 bytes. */ Tom> -using compat_x32_clock_t = long __attribute__ ((__aligned__ (4))); Tom> +typedef long __attribute__ ((__aligned__ (4))) compat_x32_clock_t; I think if we need this to remain a typedef, a comment explaining the reason would be good. Tom