[PATCH v2 2/4] perf build: Add explicitly sequenced -lzstd to libbfd feature fallback

[Ian Rogers <irogers@google.com>]

Distributions like Fedora currently ship a statically compiled binutils
libbfd that natively depends on zstd to decompress sections (e.g.
undefined reference to 'ZSTD_decompress').

Since libbfd generally does not reliably distribute a .pc file for
pkg-config (e.g. 'binutils-dev' evaluates missing on standard PKG_CONFIG_PATH
checks), perf historically supplements manual linker flags in fallback
chains (-lbfd -ldl -liberty -lz).

Extend the testing cascade in tools/perf/Makefile.config to utilize the
newly introduced 'libbfd-liberty-z-zstd' feature test.

Signed-off-by: Ian Rogers <irogers@google.com>
Assisted-by: Antigravity:gemini-3.1-pro
---
 tools/perf/Makefile.config | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 4d5993da9f94..f589a461f4be 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -893,6 +893,7 @@ ifdef BUILD_NONDISTRO
   $(call feature_check,libbfd-threadsafe)
   $(call feature_check,libbfd-liberty)
   $(call feature_check,libbfd-liberty-z)
+  $(call feature_check,libbfd-liberty-z-zstd)
 
   ifneq ($(feature-libbfd-threadsafe), 1)
     $(error binutils-dev(el) 2.42 or later is required for non-distro builds)
@@ -906,6 +907,8 @@ ifdef BUILD_NONDISTRO
     EXTLIBS += -lbfd -lopcodes -liberty
   else ifeq ($(feature-libbfd-liberty-z), 1)
     EXTLIBS += -lbfd -lopcodes -liberty -lz
+  else ifeq ($(feature-libbfd-liberty-z-zstd), 1)
+    EXTLIBS += -lbfd -lopcodes -liberty -lz -lzstd
   endif
 
   CFLAGS += -DHAVE_LIBBFD_SUPPORT
-- 
2.55.0.1003.g10538fe699-goog