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SubjectRe: [PATCH bpf v3] libbpf: Fix build on read-only filesystems
On Sun, Dec 22, 2019 at 10:14 PM Namhyung Kim <namhyung@kernel.org> wrote:
>
> I got the following error when I tried to build perf on a read-only
> filesystem with O=dir option.
>
> $ cd /some/where/ro/linux/tools/perf
> $ make O=$HOME/build/perf
> ...
> CC /home/namhyung/build/perf/lib.o
> /bin/sh: bpf_helper_defs.h: Read-only file system
> make[3]: *** [Makefile:184: bpf_helper_defs.h] Error 1
> make[2]: *** [Makefile.perf:778: /home/namhyung/build/perf/libbpf.a] Error 2
> make[2]: *** Waiting for unfinished jobs....
> LD /home/namhyung/build/perf/libperf-in.o
> AR /home/namhyung/build/perf/libperf.a
> PERF_VERSION = 5.4.0
> make[1]: *** [Makefile.perf:225: sub-make] Error 2
> make: *** [Makefile:70: all] Error 2
>
> It was becaused bpf_helper_defs.h was generated in current directory.
> Move it to OUTPUT directory.
>
> Tested-by: Andrii Nakryiko <andriin@fb.com>
> Acked-by: Andrii Nakryiko <andriin@fb.com>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> ---
> tools/lib/bpf/Makefile | 15 ++++++++-------
> tools/testing/selftests/bpf/.gitignore | 1 +
> tools/testing/selftests/bpf/Makefile | 6 +++---
> 3 files changed, 12 insertions(+), 10 deletions(-)
>

[...]

> diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
> index 419652458da4..1ff0a9f49c01 100644
> --- a/tools/testing/selftests/bpf/.gitignore
> +++ b/tools/testing/selftests/bpf/.gitignore
> @@ -40,3 +40,4 @@ xdping
> test_cpp
> /no_alu32
> /bpf_gcc
> +bpf_helper_defs.h

looks good, thanks!

[...]

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