On 1/15/25 2:47 AM, Li Zhijian wrote:
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, override the srctree in the kselftests's top Makefile
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.
Cc: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx>
Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxx>
Tested-by: Quentin Monnet <qmo@xxxxxxxxxx>
[...]
tools/testing/selftests/Makefile | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
Shuah, want to pick this up given its the top-level Makefile or want us to
route it via bpf-next with your Ack? Fwiw, BPF CI went through fine.
