Re: [PATCH v3 2/2] bpf: makefiles: do not generate empty vmlinux.h

Leo Yan
2022-12-19T03:59:57Z

On Sun, Dec 18, 2022 at 06:35:09AM +0800, Changbin Du wrote:
> Remove the empty vmlinux.h if bpftool failed to dump btf info.
> The empty vmlinux.h can hide real error when reading output
> of make.
>
> This is done by adding .DELETE_ON_ERROR special target in related
> makefiles.

We need to handle the same case for perf building, its makefile
linux/tools/perf/Makefile.perf also uses bpftool to generate
vmlinux.h, see:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/Makefile.perf#n1067

Please consider to use a separate patch to add the same change in
Makefile.perf?

Thanks,
Leo

> Signed-off-by: Changbin Du <changbin.du@gmail.com>
> ---
> tools/bpf/bpftool/Makefile | 3 +++
> tools/testing/selftests/bpf/Makefile | 3 +++
> 2 files changed, 6 insertions(+)
>
> diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
> index 787b857d3fb5..313fd1b09189 100644
> --- a/tools/bpf/bpftool/Makefile
> +++ b/tools/bpf/bpftool/Makefile
> @@ -289,3 +289,6 @@ FORCE:
> .PHONY: all FORCE bootstrap clean install-bin install uninstall
> .PHONY: doc doc-clean doc-install doc-uninstall
> .DEFAULT_GOAL := all
> +
> +# Delete partially updated (corrupted) files on error
> +.DELETE_ON_ERROR:
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index c22c43bbee19..205e8c3c346a 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -626,3 +626,6 @@ EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) \
> liburandom_read.so)
>
> .PHONY: docs docs-clean
> +
> +# Delete partially updated (corrupted) files on error
> +.DELETE_ON_ERROR:
> --
> 2.37.2
>