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(unknown [10.167.135.44]) by edo.cn.fujitsu.com (Postfix) with ESMTP id 8AC841A000B; Tue, 17 Dec 2024 11:10:16 +0800 (CST) From: Li Zhijian To: linux-kbuild@vger.kernel.org Cc: Masahiro Yamada , Nathan Chancellor , Nicolas Schier , linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Shuah Khan , linux-kselftest@vger.kernel.org, Li Zhijian Subject: [PATCH RFC] Makefile: Export absolute srctree path for out-of-tree builds Date: Tue, 17 Dec 2024 11:10:52 +0800 Message-ID: <20241217031052.69744-1-lizhijian@fujitsu.com> X-Mailer: git-send-email 2.44.0 Precedence: bulk X-Mailing-List: linux-kbuild@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-TM-AS-Product-Ver: IMSS-9.1.0.1417-9.0.0.1002-28864.004 X-TM-AS-User-Approved-Sender: Yes X-TMASE-Version: IMSS-9.1.0.1417-9.0.1002-28864.004 X-TMASE-Result: 10--0.633800-10.000000 X-TMASE-MatchedRID: QxNw5Kr7aBeh8NIgadoMHh1kSRHxj+Z5ohrMq0nEhQczyScpZuj/nizy bVqWyY2N+SSaqR6S8TQlLmeOTKV2xRlcucGIY/14v8fLAX0P50DNKdtHc3A3XDnP3k+syM8k+jV zof0NuiPPQfWquCqW3SLebaXr2O4UlFKRvEp4lzj4c540RssCiaVjgXyvS9c/dE7HIe9l0mw9dx qDxQNRxSL637QCIVpiV1uoDPGLPAgfE8yM4pjsDwtuKBGekqUpnH7sbImOEBSlrvbCC0mrLDMDm LGIOPRcJ6wy91uaDgtO/9J3JLbpTrF5ko+nSlUw0nnrlhi+scYjuLsNpywqtfar0z1Io/d1yvIH coJBdxKbDRBqS2n66yzP5xAyz9Oenvkw4sh/+PcMX5CwH5DTUmgGZNLBHGNe X-TMASE-SNAP-Result: 1.821001.0001-0-1-22:0,33:0,34:0-0 Fixes an issue where out-of-tree kselftest builds fail when building the BPF and bpftools components. The failure occurs because the top-level Makefile passes a relative srctree path ('..') to its sub-Makefiles, which leads to errors in locating necessary files. For example, the following error is encountered: ``` $ make V=1 O=$build/ TARGETS=hid kselftest-all ... make -C ../tools/testing/selftests all make[4]: Entering directory '/path/to/linux/tools/testing/selftests/hid' make -C /path/to/linux/tools/testing/selftests/../../../tools/lib/bpf OUTPUT=/path/to/linux/O/kselftest/hid/tools/build/libbpf/ \ EXTRA_CFLAGS='-g -O0' \ DESTDIR=/path/to/linux/O/kselftest/hid/tools prefix= all install_headers make[5]: Entering directory '/path/to/linux/tools/lib/bpf' ... make[5]: Entering directory '/path/to/linux/tools/bpf/bpftool' Makefile:127: ../tools/build/Makefile.feature: No such file or directory make[5]: *** No rule to make target '../tools/build/Makefile.feature'. Stop. ``` To resolve this, the srctree is exported as an absolute path (abs_srctree) when performing an out-of-tree build. This ensures that all sub-Makefiles have the correct path to the source tree, preventing directory resolution errors. Signed-off-by: Li Zhijian --- Request for Additional Testing We welcome all contributors and CI systems to test this change thoroughly. In theory, this change should not affect in-tree builds. However, to ensure stability and compatibility, we encourage testing across different configurations. What has been tested? - out-of-tree kernel build - out-of-tree kselftest-all --- Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index e5b8a8832c0c..36e65806bb5e 100644 --- a/Makefile +++ b/Makefile @@ -275,7 +275,8 @@ else ifeq ($(srcroot)/,$(dir $(CURDIR))) srcroot := .. endif -export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) +srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) +export srctree := $(if $(building_out_of_srctree),$(abs_srctree),$(srctree)) ifdef building_out_of_srctree export VPATH := $(srcroot)