Currently, building the bpf samples isn't working.
Running make from the directory 'samples/bpf' will just shows following
result without compiling any samples.
$ make
make -C ../../ /git/linux/samples/bpf/ BPF_SAMPLES_PATH=/git/linux/samples/bpf
make[1]: Entering directory '/git/linux'
CALL scripts/checksyscalls.sh
CALL scripts/atomic/check-atomics.sh
DESCEND objtool
make[1]: Leaving directory '/git/linux'
$ ls *kern.o
ls: cannot access '*kern.o': No such file or directory
By using 'git bisect', found the problem is derived from below commit.
commit 394053f4a4b3 ("kbuild: make single targets work more correctly")
> Currently, the single target build directly descends into the directory
> of the target. For example,
>
> $ make foo/bar/baz.o
>
> ... directly descends into foo/bar/.
>
> On the other hand, the normal build usually descends one directory at
> a time, i.e. descends into foo/, and then foo/bar/.
>
> This difference causes some problems.
>
> [...]
>
> This commit fixes those problems by making the single target build
> descend in the same way as the normal build does.
Not familiar with kbuild, so I'm not sure why this led to build failure.
My humble guess is, samples/bpf/Makefile tries to run make from current
directory, 'sample/bpf', but somehow upper commit changed the way it works.
samples/bpf/Makefile:232
# Trick to allow make to be run from this directory
all:
$(MAKE) -C ../../ $(CURDIR)/ BPF_SAMPLES_PATH=$(CURDIR)
I've tried to figure out the problem with 'make --trace', but not sure why
it's not working. Just a hunch with build directory.
Any ideas to fix this problem?
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