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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1758793501; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ew+TJ+ULudDPsPQa2ndt/jLM13vxDA+61FCxMS3PlS0=; b=eWDlD36uoJAARBc3UuJSoVPXesrRZJNzDTDkccA1H1FXIZPV7nMz9ow8EK7/OCPwRH22H9 QooYGpNjPd99W2s3hPeF+Xwm+0nKgAkddCaJ00/yJnyApEzqMq89AfWUiWsve7Oi3jn6VU qCNmakPwLQZhCtb2coEePjiOD8l1Vh4= X-MC-Unique: tEvw5vawNIyfdEmXsdId7g-1 X-Mimecast-MFC-AGG-ID: tEvw5vawNIyfdEmXsdId7g_1758793495 From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= To: qemu-devel@nongnu.org Cc: Hanna Reitz , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Kevin Wolf , qemu-rust@nongnu.org, Richard Henderson , Markus Armbruster , Christian Schoenebeck , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , qemu-block@nongnu.org, Stefan Weil , "Dr. David Alan Gilbert" , Manos Pitsidianakis , Gerd Hoffmann , devel@lists.libvirt.org, Paolo Bonzini Subject: [PATCH v4 01/23] include: define constant for early constructor priority Date: Thu, 25 Sep 2025 10:44:19 +0100 Message-ID: <20250925094441.1651372-2-berrange@redhat.com> In-Reply-To: <20250925094441.1651372-1-berrange@redhat.com> References: <20250925094441.1651372-1-berrange@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 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=170.10.133.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.444, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, T_SPF_TEMPERROR=0.01 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 @redhat.com) X-ZM-MESSAGEID: 1758793607368116600 Functions marked with __attribute__((__constructor__)) will be invoked in linker order. In theory this is well defined, but in practice, it is hard to determine what this order will be with the layers of indirection through meson, ninja and the static libraries QEMU builds. Notably, the order currently appears different between Linux and Windows (as tested with Wine on Linux). This can cause problems when certain QEMU constructors have a dependancy on other QEMU constructors. To address this define a QEMU_CONSTRUCTOR_EARLY constant which provides a priority value that will run before other default constructors. This is to be used for QEMU constructors that are themselves self-contained, but may be relied upon by other constructors. Reviewed-by: Richard Henderson Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Daniel P. Berrang=C3=A9 --- include/qemu/compiler.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h index 1c2b673c05..4c49f52eb0 100644 --- a/include/qemu/compiler.h +++ b/include/qemu/compiler.h @@ -194,6 +194,14 @@ # define QEMU_USED #endif =20 +/* + * A priority for __attribute__((constructor(...))) that + * will run earlier than the default constructors. Must + * only be used for functions that have no dependency + * on global initialization of other QEMU subsystems. + */ +#define QEMU_CONSTRUCTOR_EARLY 101 + /* * Disable -ftrivial-auto-var-init on a local variable. * --=20 2.50.1