Re: [RFC PATCH v3 2/3] perf build: Prefer zlib-rs over zlib when available

[sashiko-bot@kernel.org]

> Detect and prefer zlib-rs over C zlib in the perf build unless disabled
> with NO_ZLIB_RS=1 (or NO_ZLIB=1 / NO_RUST=1):
> 
> - Move Rust compiler detection ahead of zlib detection in
>   tools/perf/Makefile.config and use feature_check + feature_rust_lib for
>   zlib-rs, setting both HAVE_ZLIB_SUPPORT and HAVE_ZLIB_RS_SUPPORT when
>   zlib-rs is used and falling back to C zlib (-lz) otherwise.
> - Replace -lz with $(ZLIB_LIBS) in DWARFLIBS and llvm-config
>   --system-libs so static libdw/libelf and libLLVM configurations use
>   the selected zlib implementation.
> - Build and clean libz_rs.a in $(OUTPUT)libz_rs/, pass ZLIB_CFLAGS when
>   building static libbpf, and share RUST_OUTPUT with the host bootstrap
>   bpftool build in tools/perf/bpf_skel.mak.
> - Expose 'zlib-rs' in 'perf check feature' / 'perf version --build-options'
>   and document it in perf-check.txt.
> - Add zlib-rs package mappings to tools/perf/scripts/install-build-deps.sh
>   and NO_ZLIB / NO_ZLIB_RS build tests to tools/perf/tests/make.
> 
> Signed-off-by: Ian Rogers <irogers@google.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261105180923.3441359-1-irogers@google.com?part=2