Re: [PATCH] bpf: Replace deprecated -target with --target= for Clang

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On 6/23/23 10:51 AM, Quentin Monnet wrote:
2023-06-23 02:09 UTC+0000 ~ Fangrui Song <maskray@xxxxxxxxxx>
-target has been deprecated since Clang 3.4 in 2013. Use the preferred
--target=bpf form instead. This matches how we use --target= in
scripts/Makefile.clang.

This seems to be the relevant commit, for reference:

https://github.com/llvm/llvm-project/commit/274b6f0c87a6a1798de0a68135afc7f95def6277


Signed-off-by: Fangrui Song <maskray@xxxxxxxxxx>
---
  Documentation/bpf/bpf_devel_QA.rst              | 10 +++++-----
  Documentation/bpf/btf.rst                       |  4 ++--
  Documentation/bpf/llvm_reloc.rst                |  6 +++---
  drivers/hid/bpf/entrypoints/Makefile            |  2 +-
  kernel/bpf/preload/iterators/Makefile           |  2 +-
  samples/bpf/Makefile                            |  6 +++---
  samples/bpf/gnu/stubs.h                         |  3 ++-
  samples/bpf/test_lwt_bpf.sh                     |  2 +-
  samples/hid/Makefile                            |  6 +++---
  tools/bpf/bpftool/Documentation/bpftool-gen.rst |  4 ++--
  tools/bpf/bpftool/Makefile                      |  2 +-
  tools/bpf/runqslower/Makefile                   |  2 +-
  tools/build/feature/Makefile                    |  2 +-
  tools/perf/Documentation/perf-config.txt        |  2 +-
  tools/perf/Makefile.perf                        |  4 ++--
  tools/perf/util/llvm-utils.c                    |  4 ++--
  tools/testing/selftests/bpf/Makefile            |  6 +++---
  tools/testing/selftests/bpf/gnu/stubs.h         |  3 ++-
  tools/testing/selftests/hid/Makefile            |  6 +++---
  tools/testing/selftests/net/Makefile            |  4 ++--
  tools/testing/selftests/tc-testing/Makefile     |  2 +-
  21 files changed, 42 insertions(+), 40 deletions(-)


diff --git a/samples/bpf/gnu/stubs.h b/samples/bpf/gnu/stubs.h
index 719225b16626..cc37155fbfa5 100644
--- a/samples/bpf/gnu/stubs.h
+++ b/samples/bpf/gnu/stubs.h
@@ -1 +1,2 @@
-/* dummy .h to trick /usr/include/features.h to work with 'clang -target bpf' */
+/* SPDX-License-Identifier: GPL-2.0 */

Are these necessary, seeing that the files only contain this single-line
comment?

Yeah, lets drop that one. Otherwise looks good. Could you split out the tools/perf/
changes into a separate commit? I would assume that Arnaldo wants to take these
changes via perf tree instead.

+/* dummy .h to trick /usr/include/features.h to work with 'clang --target=bpf' */

Other than this, the change looks good, thanks. Although it should
probably target bpf-next rather than bpf?

Acked-by: Quentin Monnet <quentin@xxxxxxxxxxxxx>




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