On 10/17/19 2:44 AM, Jakub Sitnicki wrote:
> Don't generate a broken bpf_helper_defs.h header if the helper script needs
> updating because it doesn't recognize a newly added type. Instead print an
> error that explains why the build is failing and stop.
>
> Fixes: 456a513bb5d4 ("scripts/bpf: Emit an #error directive known types list needs updating")
> Suggested-by: Andrii Nakryiko <andriin@xxxxxx>
> Signed-off-by: Jakub Sitnicki <jakub@xxxxxxxxxxxxxx>
> ---
> scripts/bpf_helpers_doc.py | 4 ++--
> tools/lib/bpf/Makefile | 3 ++-
> 2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/scripts/bpf_helpers_doc.py b/scripts/bpf_helpers_doc.py
> index 08300bc024da..7548569e8076 100755
> --- a/scripts/bpf_helpers_doc.py
> +++ b/scripts/bpf_helpers_doc.py
> @@ -488,8 +488,8 @@ class PrinterHelpers(Printer):
> return t
> if t in self.mapped_types:
> return self.mapped_types[t]
> - print("")
> - print("#error \"Unrecognized type '%s', please add it to known types!\"" % t)
> + print("Unrecognized type '%s', please add it to known types!" % t,
> + file=sys.stderr)
This looks good, thanks!
> sys.exit(1)
>
> seen_helpers = set()
> diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> index 75b538577c17..26c202261c5f 100644
> --- a/tools/lib/bpf/Makefile
> +++ b/tools/lib/bpf/Makefile
> @@ -169,7 +169,8 @@ $(BPF_IN): force elfdep bpfdep bpf_helper_defs.h
>
> bpf_helper_defs.h: $(srctree)/include/uapi/linux/bpf.h
> $(Q)$(srctree)/scripts/bpf_helpers_doc.py --header \
> - --file $(srctree)/include/uapi/linux/bpf.h > bpf_helper_defs.h
> + --file $(srctree)/include/uapi/linux/bpf.h > $@.tmp
> + @mv $@.tmp $@
This is unnecessary. Let's add ".DELETE_ON_ERROR:" at the end Makefile
instead to trigger this auto-deletion of failed targets automatically.
>
> $(OUTPUT)libbpf.so: $(OUTPUT)libbpf.so.$(LIBBPF_VERSION)
>
>
