[PATCH v3 0/4] tools build: Fixes for libbfd -lzstd dependency

[Ian Rogers]

This series addresses build problems when linking against static
libbfd/libopcodes on distributions like Fedora where binutils is built
with zstd section decompression support (requiring '-liberty -lz -lzstd'
together).

In v2, commit 89d001d48ec7 ("tools build: Add zstd to the binutils
library feature tests") landed in tools/build/feature/Makefile at the
same time, creating a merge conflict and only adding '|| $(BUILD_BFD)
-lzstd' without '-liberty -lz' or the corresponding
libbfd-liberty-z-zstd feature check in perf and bpftool (so even if
test-libbfd.bin passed with -lzstd, perf and bpftool would link only
'-lbfd -lopcodes' without '-lzstd').

v3 rebases onto perf-tools-next (v7.4-rc1), fixes commit 89d001d48ec7 in
patch 1/4, collects the Acked-by tags from Quentin Monnet and Peter
Zijlstra, updates the LIBOPCODES_LIBS comment in tools/objtool/Makefile,
and moves the AI assistance disclosure from commit trailers to the cover
letter.

v2: https://lore.kernel.org/all/20260909204122.1993010-1-irogers@xxxxxxxxxx/
v1: https://lore.kernel.org/linux-perf-users/20260909181030.1870496-1-irogers@xxxxxxxxxx/

AI Assistance Disclosure (per Documentation/process/coding-assistants.rst):
- Tools used: Antigravity coding assistant and Sashiko automated patch
  review.
- Summary of prompts and assistance: Rebased the 4-patch series onto
  perf-tools-next, resolved the conflict with commit 89d001d48ec7 in
  tools/build/feature/Makefile, incorporated review feedback and
  Acked-by tags, and verified with scripts/checkpatch.pl.

Ian Rogers (4):
  tools build: Add explicitly sequenced -lzstd to libbfd feature
    fallback
  perf build: Add explicitly sequenced -lzstd to libbfd feature fallback
  bpftool: Add explicitly sequenced -lzstd to libbfd feature fallback
  objtool: Add explicitly sequenced -lzstd to libopcodes fallback

 tools/bpf/bpftool/Makefile   |  4 ++++
 tools/build/Makefile.feature |  3 ++-
 tools/build/feature/Makefile | 19 +++++++++++++------
 tools/objtool/Makefile       |  7 ++++---
 tools/perf/Makefile.config   |  3 +++
 5 files changed, 26 insertions(+), 10 deletions(-)

-- 
2.56.0.385.gac671c819a-goog