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Tsirkin" , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Paolo Bonzini , Thomas Huth , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Mahmoud Mandour , Alexandre Iooss , Markus Armbruster , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Stefano Garzarella Subject: [PATCH v3 1/3] win32: remove usage of attribute gcc_struct Date: Thu, 28 Nov 2024 12:15:08 -0800 Message-Id: <20241128201510.869974-2-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241128201510.869974-1-pierrick.bouvier@linaro.org> References: <20241128201510.869974-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::52e; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pg1-x52e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1732824981415019100 Content-Type: text/plain; charset="utf-8" This attribute is not recognized by clang. An investigation has been performed to ensure this attribute has no effect on layout of structures we use in QEMU [1], so it's safe to remove now. In the future, we'll forbid introducing new bitfields in packed struct, as they are the one potentially impacted by this change. [1] https://lore.kernel.org/qemu-devel/66c346de-7e20-4831-b3eb-1cda83240af9= @linaro.org/ Reviewed-by: Thomas Huth Acked-by: Stefano Garzarella Signed-off-by: Pierrick Bouvier Reviewed-by: Richard Henderson --- meson.build | 5 ----- include/qemu/compiler.h | 7 +------ scripts/cocci-macro-file.h | 6 +----- subprojects/libvhost-user/libvhost-user.h | 6 +----- 4 files changed, 3 insertions(+), 21 deletions(-) diff --git a/meson.build b/meson.build index a290dbfa331..97cefb7cdd7 100644 --- a/meson.build +++ b/meson.build @@ -354,11 +354,6 @@ elif host_os =3D=3D 'sunos' qemu_common_flags +=3D '-D__EXTENSIONS__' elif host_os =3D=3D 'haiku' qemu_common_flags +=3D ['-DB_USE_POSITIVE_POSIX_ERRORS', '-D_BSD_SOURCE'= , '-fPIC'] -elif host_os =3D=3D 'windows' - if not compiler.compiles('struct x { int y; } __attribute__((gcc_struct)= );', - args: '-Werror') - error('Your compiler does not support __attribute__((gcc_struct)) - pl= ease use GCC instead of Clang') - endif endif =20 # Choose instruction set (currently x86-only) diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index c06954ccb41..d904408e5ed 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -22,12 +22,7 @@ #define QEMU_EXTERN_C extern #endif =20 -#if defined(_WIN32) && (defined(__x86_64__) || defined(__i386__)) -# define QEMU_PACKED __attribute__((gcc_struct, packed)) -#else -# define QEMU_PACKED __attribute__((packed)) -#endif - +#define QEMU_PACKED __attribute__((packed)) #define QEMU_ALIGNED(X) __attribute__((aligned(X))) =20 #ifndef glue diff --git a/scripts/cocci-macro-file.h b/scripts/cocci-macro-file.h index d247a5086e9..c64831d5408 100644 --- a/scripts/cocci-macro-file.h +++ b/scripts/cocci-macro-file.h @@ -23,11 +23,7 @@ #define G_GNUC_WARN_UNUSED_RESULT __attribute__((warn_unused_result)) #define G_GNUC_NULL_TERMINATED __attribute__((sentinel)) =20 -#if defined(_WIN32) && (defined(__x86_64__) || defined(__i386__)) -# define QEMU_PACKED __attribute__((gcc_struct, packed)) -#else -# define QEMU_PACKED __attribute__((packed)) -#endif +#define QEMU_PACKED __attribute__((packed)) =20 #define cat(x,y) x ## y #define cat2(x,y) cat(x,y) diff --git a/subprojects/libvhost-user/libvhost-user.h b/subprojects/libvho= st-user/libvhost-user.h index deb40e77b3f..2ffc58c11b1 100644 --- a/subprojects/libvhost-user/libvhost-user.h +++ b/subprojects/libvhost-user/libvhost-user.h @@ -186,11 +186,7 @@ typedef struct VhostUserShared { unsigned char uuid[UUID_LEN]; } VhostUserShared; =20 -#if defined(_WIN32) && (defined(__x86_64__) || defined(__i386__)) -# define VU_PACKED __attribute__((gcc_struct, packed)) -#else -# define VU_PACKED __attribute__((packed)) -#endif +#define VU_PACKED __attribute__((packed)) =20 typedef struct VhostUserMsg { int request; --=20 2.39.5 From nobody Fri Dec 27 18:35:13 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1732824976; cv=none; d=zohomail.com; s=zohoarc; b=UDZ0t9S1NnmmjRoR6e2r/YLIP+Z35Kic2pXz8/wF1PdQ55CXCDi8YCLKwnUvgoTTs7ZT09Vv/F69cpb2dwnBIa5A1GBs5oFUxDYKlaWWtATx/YnuhPyZk8g8LC/IuEQ4KdIw62dHYNWoK3f9AgTZYfWyh6OiWhDnK4fhukYOZoA= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1732824976; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; 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[216.180.64.156]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2ee0fb10049sm3912861a91.43.2024.11.28.12.15.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Nov 2024 12:15:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1732824923; x=1733429723; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Cw+i/RTnE1TOqvWRDHCHN95wIYPbil6+hZz5wFKKxjY=; b=JgoxDV4WyTSsbUyHbjbeA4eV9g0A6v+lWKpsUMZcsrJDxgBxL8eLqLuWi3wTvEDAoW ropXzZj5X64w4h8838Kqmp7Jkx98SHIJEmsG7j4OnMOKBEa2/1AxFXbIJJTkLxqMdV6E h1pvFGJI8BThcNSSIRTt7sRxfm5lU8HhdXmJBfkWlTIjiZ9tRSs5m80JflGH47OBXML0 UqdEmv9vkNvtGc98qkpOzPJQ++A6wxMttGCXrlQVM5uhVb5OflKQWoILcn8t+hlTIeuR EGtnySWJU22ariCQRAHKKlbJ4ecmRbv4VQuBgEvZ0k/OOuxTXAC4BqCxPLP5B8Ed0uoq 74HA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732824923; x=1733429723; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Cw+i/RTnE1TOqvWRDHCHN95wIYPbil6+hZz5wFKKxjY=; b=FfDPfCXvLwvbx+FCFJ2Mz38jmwhFBNlv/9s8ESdM/Caonn6BgCD9ZFIxSbBUKQOzxA eBqf+4chG8oSmz7q6t91nbbKS/vVy0CxPhIBRFjuVL92TvVU5zX+WDnT+lnAccEWJjWg QK1ymXMTWow/ainp9WTywXpORzAgpN1htv051MJcCS13GqKeTkDyYPAdbwmxxpflLWNJ eY242cCOWHv9SZB6O8CzGiRG3V7oQDzsfh72KlieVyZ7cIhMbJTbKob94TwTxz60NEfJ oAStHs6HaGlOpMNIxwvNHk/Um2GOKcWl3myI9JvZVAQTO/Vv7o2Ly5++VdNv7KrfANce x8TA== X-Gm-Message-State: AOJu0YzYr69NpbOiKQ0AgcBbcDIMfxy3AnVjGe5S7llIv5s1FwRPKodE mih0cd/XNpXMVR8bUdfPZ864pIjGmATkXbrI+nUUC8COdy/Khzh/X3qRVHxKy8iWRitJZ38TPfm xUMY= X-Gm-Gg: ASbGncvKGRdFIxlVa+TFGkINtRcCRf4rXcTwWSlrFKsmmT1VFkyA/porlfceaco9vvN xUe4KSYkC7o3R4wNgu4TkUpBN3jf1OX0Yx1r3ZJwmUMekxF7zK52Aj8tMs8P7HTa0CFfT9KC/hQ FppQ71JDxj1An2bIBICUeTCN5gG/z1T0rArE+1w4Q+uZ0UTj5vj8RTAqda00aFavMhw7fDxTTw1 fcnSSHEDhhnurYC6Qb7TAXxMXY3S16sKyqDjgJUeNnM8LVUxlYSf/fTUHpTYOSUjfFWjv/izBcK i/3Fg1eU2xATHg== X-Google-Smtp-Source: AGHT+IGUkkRsIWbgqIrl/CWoZkmRUDQipCAzO3Uwq7QfeYmDRCedAnnRp7cVFOEB3h6Du0O6hLImGg== X-Received: by 2002:a17:90b:38cd:b0:2ea:8f02:719d with SMTP id 98e67ed59e1d1-2ee25b0875amr6470479a91.16.1732824923125; Thu, 28 Nov 2024 12:15:23 -0800 (PST) From: Pierrick Bouvier To: qemu-devel@nongnu.org Cc: Pierrick Bouvier , "Michael S. Tsirkin" , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Paolo Bonzini , Thomas Huth , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Mahmoud Mandour , Alexandre Iooss , Markus Armbruster , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Stefano Garzarella Subject: [PATCH v3 2/3] docs/devel/style: add a section about bitfield, and disallow them for packed structures Date: Thu, 28 Nov 2024 12:15:09 -0800 Message-Id: <20241128201510.869974-3-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241128201510.869974-1-pierrick.bouvier@linaro.org> References: <20241128201510.869974-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::1034; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pj1-x1034.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1732824977398019100 Content-Type: text/plain; charset="utf-8" Signed-off-by: Pierrick Bouvier Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson --- docs/devel/style.rst | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/docs/devel/style.rst b/docs/devel/style.rst index 2f68b500798..2d73e6a8f7a 100644 --- a/docs/devel/style.rst +++ b/docs/devel/style.rst @@ -416,6 +416,26 @@ definitions instead of typedefs in headers and functio= n prototypes; this avoids problems with duplicated typedefs and reduces the need to include headers from other headers. =20 +Bitfields +--------- + +C bitfields can be a cause of non-portability issues, especially under win= dows +where `MSVC has a different way to lay them out than gcc +`_, and on bi= g and +little endian hosts. + +For this reason, we disallow usage of bitfields in packed structures and i= n any +structures which are supposed to exactly match a specific layout in guest +memory. Some existing code may use it, and we carefully ensured the layout= was +the one expected. + +We also suggest avoiding bitfields even in structures where the exact +layout does not matter, unless you can show that they provide a significant +memory usage or usability benefit. + +We encourage the usage of ``include/hw/registerfields.h`` as a safe replac= ement +for bitfields. + Reserved namespaces in C and POSIX ---------------------------------- =20 --=20 2.39.5 From nobody Fri Dec 27 18:35:13 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=linaro.org ARC-Seal: i=1; a=rsa-sha256; t=1732824976; cv=none; d=zohomail.com; s=zohoarc; b=XXo/iDlVCZjI3GCIts2f9nM0KwfXCaihFboAiyaRI3Lr+m46/yDxV57vJYn9q9YdgdBIEOQRiINVSZD3HTdGuzh5e9rs1IyYPYYy4KrpYNqFwF5+Aoj1TrDgvhJ436C//XPi7zf+NvY1b/i+hMhfDYscn61896qI6u46R924XFU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1732824976; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=D/WE4DdwfNtGJC4bBQHDV6Up1JyJz8d62bKAZjE6uOc=; b=oLrZ9L05EuSwYhTCIxDXEQkG1cIlbYGZg3cWsJ40Nlzq+Nd5zNW4ev/oJ+2Ps8ujtZTvWoF1CNtaAHJL5cGJx7KloB2JOYbaMRRajk7P61nE47a9TN3NtUER9oOyjcE4IDeNMf4JBkeKS+erT88B0KrHtu9X6PblcA/u8g3y1zA= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1732824976319409.1451341193108; Thu, 28 Nov 2024 12:16:16 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tGkvO-0001NK-Ja; Thu, 28 Nov 2024 15:15:42 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tGkvB-0001Ij-Ip for qemu-devel@nongnu.org; Thu, 28 Nov 2024 15:15:29 -0500 Received: from mail-pj1-x102c.google.com ([2607:f8b0:4864:20::102c]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1tGkv7-0001mf-KJ for qemu-devel@nongnu.org; Thu, 28 Nov 2024 15:15:29 -0500 Received: by mail-pj1-x102c.google.com with SMTP id 98e67ed59e1d1-2ea45dac86eso927555a91.3 for ; Thu, 28 Nov 2024 12:15:25 -0800 (PST) Received: from linaro.. 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[216.180.64.156]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2ee0fb10049sm3912861a91.43.2024.11.28.12.15.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Nov 2024 12:15:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1732824924; x=1733429724; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=D/WE4DdwfNtGJC4bBQHDV6Up1JyJz8d62bKAZjE6uOc=; b=AQdOrZSwBgh7kGOZQvr/cSxqvFk/QeVW+U0DcTekW4TJsg5xU24tQJNezPBLRfJsCX 1umzAkPDaQ0PMbF/7To6kYQqO9rr2KZkBIQkSz8MoaWfhXIE7YKnk5h5qJzLJRVajxQy jMM/Obe7R6keL7aKYUqDW9sGTpl9BtQCgTxXBIDwfBBh0dBVJtYZOjZaEMc0iCCMqHnI mcxYQzVWCbBYUH7+Ao9Ddfq7TrGJJH3XchcPjjRtwxh4fAWX+r0mfHmFJvhrCyeGPfgw +iLK3rfpl3YuroSuJf/jXjob8pzBJWDg2/0voMhlAD7mPK05ISTDckUBRG0SYBG0Y0/q VevA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732824924; x=1733429724; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=D/WE4DdwfNtGJC4bBQHDV6Up1JyJz8d62bKAZjE6uOc=; b=gEfil7Ol0gOZTaGQLIVAaCJxeiGLj6msjaSOi3jabZISecGlpf4Qzlf1VO8OO53N7Q +paQXdo5OuGNmFdoG3EP52tZDX5r2Gz8IKK7lE0BueAsTojXIaLt1/6JU7a2pXkNM6JR ZeX4NrC7ttDvnoqyQXscoZ3EkD6RGPCG67FCE5IPvNZunahUcAwosHJ5NCH3DF5TyWwy v8Qi8AeedINXy9EfK+V1tEWIYPvPKiOBNtYOvehF4yI9Sbq81detoCFv43WdOyFrxRQF eDF0ca2zpC4VZ85h91DttbJbfiuWa1ugbXI0fNOikAI6Qi6cN6M7fCztRXeI9QkOQk05 eBfQ== X-Gm-Message-State: AOJu0Yx41L58ScMaApfq866HN7rSkRK5NMbKfq1JsceJLiQuSJ0owFZh pKDOPYTUs+q13AFBs+PZBNsRrfjOWZdoibOfLtVEZKfR2NXNufHDpkIyth5CmF/F9BNLoRs5fxa I2sQ= X-Gm-Gg: ASbGncsoOzzaBajEvf7Zq8ZB187//gykDCCK9RK9YH9nFIhkDnlBT1gdP/ZSrNs7HCJ dooQg56ZLBPssv3p6HJKQZf9ET+q6yLCjolg4WmDj1plTzK46P1CWXtcFS17hyfRCwPg9rgRtqt ZPrGO+qDl7ehjqui+7sRE5LqGrfgfKMQzyPTvp9TUp9svCEdcIuZrqGjm4fsPMXt7KuTPV5kv1w 1b1M6HXIMDCBtchbgK5SGbOKBLTs/5N1YyVeiYjXXTsnsScvIugcxpiLnmDPXjipXjdQEBzHiaS k8HGlTs6kVgzGQ== X-Google-Smtp-Source: AGHT+IEc4/QEHN4luw0cd9jmF7OPCym+gMlxgj0UeiM+RCbpeUilJvm+VPinObdpQACqZ7psos2NHQ== X-Received: by 2002:a17:90b:3e86:b0:2ea:9309:757e with SMTP id 98e67ed59e1d1-2ee08e9fa32mr10969501a91.9.1732824924110; Thu, 28 Nov 2024 12:15:24 -0800 (PST) From: Pierrick Bouvier To: qemu-devel@nongnu.org Cc: Pierrick Bouvier , "Michael S. Tsirkin" , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Paolo Bonzini , Thomas Huth , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Mahmoud Mandour , Alexandre Iooss , Markus Armbruster , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Stefano Garzarella Subject: [PATCH v3 3/3] plugins: enable linking with clang/lld Date: Thu, 28 Nov 2024 12:15:10 -0800 Message-Id: <20241128201510.869974-4-pierrick.bouvier@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241128201510.869974-1-pierrick.bouvier@linaro.org> References: <20241128201510.869974-1-pierrick.bouvier@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::102c; envelope-from=pierrick.bouvier@linaro.org; helo=mail-pj1-x102c.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1732824977488019100 Content-Type: text/plain; charset="utf-8" Windows uses a special mechanism to enable plugins to work (DLL delay loading). Option for lld is different than ld. MSYS2 clang based environment use lld by default, so restricting to this config on Windows is safe, and will avoid false bug reports. Signed-off-by: Pierrick Bouvier --- meson.build | 5 +++++ contrib/plugins/meson.build | 2 +- plugins/meson.build | 24 ++++++++++++++++++++---- tests/tcg/plugins/meson.build | 3 +-- 4 files changed, 27 insertions(+), 7 deletions(-) diff --git a/meson.build b/meson.build index 97cefb7cdd7..f286fb4f4a0 100644 --- a/meson.build +++ b/meson.build @@ -354,6 +354,11 @@ elif host_os =3D=3D 'sunos' qemu_common_flags +=3D '-D__EXTENSIONS__' elif host_os =3D=3D 'haiku' qemu_common_flags +=3D ['-DB_USE_POSITIVE_POSIX_ERRORS', '-D_BSD_SOURCE'= , '-fPIC'] +elif host_os =3D=3D 'windows' + # plugins use delaylib, and clang needs to be used with lld to make it w= ork. + if compiler.get_id() =3D=3D 'clang' and compiler.get_linker_id() !=3D 'l= d.lld' + error('On windows, you need to use lld with clang - use msys2 clang64/= clangarm64 env') + endif endif =20 # Choose instruction set (currently x86-only) diff --git a/contrib/plugins/meson.build b/contrib/plugins/meson.build index 63a32c2b4f0..484b9a808c8 100644 --- a/contrib/plugins/meson.build +++ b/contrib/plugins/meson.build @@ -12,7 +12,7 @@ if get_option('plugins') t +=3D shared_module(i, files(i + '.c') + 'win32_linker.c', include_directories: '../../include/qemu', link_depends: [win32_qemu_plugin_api_lib], - link_args: ['-Lplugins', '-lqemu_plugin_api'], + link_args: win32_qemu_plugin_api_link_flags, dependencies: glib) else t +=3D shared_module(i, files(i + '.c'), diff --git a/plugins/meson.build b/plugins/meson.build index 98542e926f8..d60be2a4d6d 100644 --- a/plugins/meson.build +++ b/plugins/meson.build @@ -17,14 +17,15 @@ if not enable_modules capture: true, command: ['sed', '-ne', 's/^[[:space:]]*\\(qemu_.*\\);/_\\1/p', '@IN= PUT@']) emulator_link_args +=3D ['-Wl,-exported_symbols_list,plugins/qemu-plug= ins-ld64.symbols'] + elif host_os =3D=3D 'windows' and meson.get_compiler('c').get_id() =3D= =3D 'clang' + # LLVM/lld does not support exporting specific symbols. However, it wo= rks + # out of the box with dllexport/dllimport attribute we set in the code. else emulator_link_args +=3D ['-Xlinker', '--dynamic-list=3D' + qemu_plugin= _symbols.full_path()] endif endif =20 if host_os =3D=3D 'windows' - dlltool =3D find_program('dlltool', required: true) - # Generate a .lib file for plugins to link against. # First, create a .def file listing all the symbols a plugin should expe= ct to have # available in qemu @@ -33,12 +34,27 @@ if host_os =3D=3D 'windows' output: 'qemu_plugin_api.def', capture: true, command: ['sed', '-e', '0,/^/s//EXPORTS/; s/[{};]//g', '@INPUT@']) + # then use dlltool to assemble a delaylib. + # The delaylib will have an "imaginary" name (qemu.exe), that is used by= the + # linker file we add with plugins (win32_linker.c) to identify that we w= ant + # to find missing symbols in current program. + win32_qemu_plugin_api_link_flags =3D ['-Lplugins', '-lqemu_plugin_api'] + if meson.get_compiler('c').get_id() =3D=3D 'clang' + # With LLVM/lld, delaylib is specified at link time (-delayload) + dlltool =3D find_program('llvm-dlltool', required: true) + dlltool_cmd =3D [dlltool, '-d', '@INPUT@', '-l', '@OUTPUT@', '-D', 'qe= mu.exe'] + win32_qemu_plugin_api_link_flags +=3D ['-Wl,-delayload=3Dqemu.exe'] + else + # With gcc/ld, delay lib is built with a specific delay parameter. + dlltool =3D find_program('dlltool', required: true) + dlltool_cmd =3D [dlltool, '--input-def', '@INPUT@', + '--output-delaylib', '@OUTPUT@', '--dllname', 'qemu.exe= '] + endif win32_qemu_plugin_api_lib =3D configure_file( input: win32_plugin_def, output: 'libqemu_plugin_api.a', - command: [dlltool, '--input-def', '@INPUT@', - '--output-delaylib', '@OUTPUT@', '--dllname', 'qemu.exe'] + command: dlltool_cmd ) endif specific_ss.add(files( diff --git a/tests/tcg/plugins/meson.build b/tests/tcg/plugins/meson.build index f847849b1b7..87a17d67bd4 100644 --- a/tests/tcg/plugins/meson.build +++ b/tests/tcg/plugins/meson.build @@ -5,9 +5,8 @@ if get_option('plugins') t +=3D shared_module(i, files(i + '.c') + '../../../contrib/plugins/= win32_linker.c', include_directories: '../../../include/qemu', link_depends: [win32_qemu_plugin_api_lib], - link_args: ['-Lplugins', '-lqemu_plugin_api'], + link_args: win32_qemu_plugin_api_link_flags, dependencies: glib) - else t +=3D shared_module(i, files(i + '.c'), include_directories: '../../../include/qemu', --=20 2.39.5