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Mon, 21 Mar 2022 15:40:55 +0100 From: Felix Moessbauer To: CC: , Felix Moessbauer Subject: [PATCH 1/1] add support to set KBUILD_BUILD_TIMESTAMP for custom kernels Date: Mon, 21 Mar 2022 15:40:17 +0100 Message-ID: <20220321144017.3684886-1-felix.moessbauer@siemens.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain Return-Path: felix.moessbauer@siemens.com X-Originating-IP: [144.145.220.65] X-ClientProxiedBy: DEMCHDC8A1A.ad011.siemens.net (139.25.226.107) To DEMCHDC89XA.ad011.siemens.net (139.25.226.103) X-TM-AS-Product-Ver: SMEX-14.0.0.3080-8.6.1018-26680.007 X-TM-AS-Result: No-10--11.859300-8.000000 X-TMASE-MatchedRID: NbF5r6o9zAN4FTWzKCjc1RQ0yjHEhiThNRqavEGD/+prIu4+N99FEQEP JrYlsf/6LaKzyzWK8GQS951qIA4yNYXhchg8arIR57Jlr8AAsclRhHeTkgZm5j8Ckw9b/GFeTJD l9FKHbrkxiSY0g7v6FoeEzyqa7HdJGTjxie3r9KXpPCW9CMDfJJUdE3qKOvgFlXePXNM4FjNdxx 6WRf+5sNbgFKE16r97JcKA2Mz38V+WiQhNVD49ls3PtKVoGXZlGAdnzrnkM48URSScn+QSXt0H8 LFZNFG7bkV4e2xSge4OPzygghEmUqJtN/QA+b6tMddlfTC+nXiHIRp05hoUvR/BXqwE9HSW X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--11.859300-8.000000 X-TMASE-Version: SMEX-14.0.0.3080-8.6.1018-26680.007 X-TM-SNTS-SMTP: 0BED44736C61B98B379F44BA88194CF664EEEBF81C253611F04B61764A14D5AD2000:8 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 350dcc16-51e7-4dcb-5793-08da0b48cee7 X-MS-TrafficTypeDiagnostic: PAXPR10MB5255:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: siemens.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Mar 2022 14:40:56.2383 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 350dcc16-51e7-4dcb-5793-08da0b48cee7 X-MS-Exchange-CrossTenant-Id: 38ae3bcd-9579-4fd4-adda-b42e1495d55a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=38ae3bcd-9579-4fd4-adda-b42e1495d55a;Ip=[194.138.21.73];Helo=[hybrid.siemens.com] X-MS-Exchange-CrossTenant-AuthSource: VE1EUR01FT102.eop-EUR01.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAXPR10MB5255 X-TUID: 0flmfJiovxDE This patch adds the infrastructure to overwrite the KBUILD_BUILD_TIMESTAMP environment variable for custom kernel builds. By that, we improve the support for reproducible kernel builds. Setting this to a fixed string further helps to profit from ccache caching on repeated builds. Signed-off-by: Felix Moessbauer --- meta/recipes-kernel/linux/files/debian/isar/build.tmpl | 1 + meta/recipes-kernel/linux/files/debian/isar/common.tmpl | 2 ++ meta/recipes-kernel/linux/linux-custom.inc | 3 +++ 3 files changed, 6 insertions(+) diff --git a/meta/recipes-kernel/linux/files/debian/isar/build.tmpl b/meta/recipes-kernel/linux/files/debian/isar/build.tmpl index b7749cec..32d2eb23 100644 --- a/meta/recipes-kernel/linux/files/debian/isar/build.tmpl +++ b/meta/recipes-kernel/linux/files/debian/isar/build.tmpl @@ -34,6 +34,7 @@ print_settings() { # --------------- # ARCH=${ARCH} # CROSS_COMPILE=${CROSS_COMPILE} +# KBUILD_BUILD_TIMESTAMP=${KBUILD_BUILD_TIMESTAMP} EOF } diff --git a/meta/recipes-kernel/linux/files/debian/isar/common.tmpl b/meta/recipes-kernel/linux/files/debian/isar/common.tmpl index b7752fb6..ffe84745 100644 --- a/meta/recipes-kernel/linux/files/debian/isar/common.tmpl +++ b/meta/recipes-kernel/linux/files/debian/isar/common.tmpl @@ -7,6 +7,7 @@ ARCH=${KERNEL_ARCH} KERNEL_PKG_IMAGE=linux-image-${KERNEL_NAME_PROVIDED} KERNEL_PKG_KERN_HEADERS=linux-headers-${KERNEL_NAME_PROVIDED} KERNEL_PKG_LIBC_HEADERS=linux-libc-dev +KBUILD_BUILD_TIMESTAMP="${KBUILD_BUILD_TIMESTAMP}" # Constants KCONF=.config @@ -36,6 +37,7 @@ main() { # variables to be exported export ARCH + export KBUILD_BUILD_TIMESTAMP # are we cross-compiling? BUILD_ARCH=$(dpkg-architecture -qDEB_BUILD_ARCH) diff --git a/meta/recipes-kernel/linux/linux-custom.inc b/meta/recipes-kernel/linux/linux-custom.inc index 8a5dbf82..f8e87453 100644 --- a/meta/recipes-kernel/linux/linux-custom.inc +++ b/meta/recipes-kernel/linux/linux-custom.inc @@ -33,6 +33,8 @@ KERNEL_HEADERS_DEBIAN_DEPENDS ?= "libc6, \ KERNEL_LIBC_DEV_DEPLOY ?= "0" +KBUILD_BUILD_TIMESTAMP ??= "LANG=C $(date)" + # Settings that may be changed on a per distro, machine or layer basis # -------------------------------------------------------------------- @@ -73,6 +75,7 @@ TEMPLATE_VARS += " \ LINUX_VERSION_EXTENSION \ KERNEL_NAME_PROVIDED \ KERNEL_CONFIG_FRAGMENTS \ + KBUILD_BUILD_TIMESTAMP \ " inherit dpkg -- 2.30.2