[PATCH v2 2/7] perf build: Add build support and capability for elfutils libasm

[Ian Rogers <irogers@google.com>]

Configure perf build system to utilize the libasm feature check
(supporting both static and dynamic builds) and export the config flags.
Add "libasm" capability detection to perf check.

Assisted-by: Antigravity:Google Gemini 3.5-flash
Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/Makefile.config | 22 ++++++++++++++++++++++
 tools/perf/builtin-check.c |  1 +
 2 files changed, 23 insertions(+)

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 6e7b15fab2ec..8527d20f498f 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -199,6 +199,13 @@ endif
 FEATURE_CHECK_CFLAGS-libcapstone := $(LIBCAPSTONE_CFLAGS)
 FEATURE_CHECK_LDFLAGS-libcapstone := $(LIBCAPSTONE_LDFLAGS) -lcapstone
 
+ifdef LIBASM_DIR
+  LIBASM_CFLAGS  := -I$(LIBASM_DIR)/include
+  LIBASM_LDFLAGS := -L$(LIBASM_DIR)/lib
+endif
+FEATURE_CHECK_CFLAGS-libasm := $(LIBASM_CFLAGS)
+FEATURE_CHECK_LDFLAGS-libasm := $(LIBASM_LDFLAGS) -lasm -ldw -lelf
+
 ifdef LIBZSTD_DIR
   LIBZSTD_CFLAGS  := -I$(LIBZSTD_DIR)/lib
   LIBZSTD_LDFLAGS := -L$(LIBZSTD_DIR)/lib
@@ -432,6 +439,7 @@ ifeq ($(feature-file-handle), 1)
 endif
 
 ifdef NO_LIBELF
+  NO_LIBASM := 1
   NO_LIBDW := 1
   NO_LIBUNWIND := 1
   NO_LIBBPF := 1
@@ -1060,6 +1068,20 @@ ifndef NO_CAPSTONE
   endif
 endif
 
+ifndef NO_LIBASM
+  $(call feature_check,libasm)
+  ifeq ($(feature-libasm), 1)
+    CFLAGS += -DHAVE_LIBASM_SUPPORT $(LIBASM_CFLAGS)
+    ifdef LIBASM_DLOPEN
+      CFLAGS += -DLIBASM_DLOPEN
+    else
+      LDFLAGS += $(LIBASM_LDFLAGS)
+      EXTLIBS += -lasm -ldw -lelf
+    endif
+    $(call detected,CONFIG_LIBASM)
+  endif
+endif
+
 ifdef EXTRA_TESTS
     $(call detected,CONFIG_EXTRA_TESTS)
     CFLAGS += -DHAVE_EXTRA_TESTS
diff --git a/tools/perf/builtin-check.c b/tools/perf/builtin-check.c
index 60437650c50f..d2ffea4d9b8b 100644
--- a/tools/perf/builtin-check.c
+++ b/tools/perf/builtin-check.c
@@ -46,6 +46,7 @@ struct feature_status supported_features[] = {
 	FEATURE_STATUS("babeltrace2-ctf-writer", HAVE_BABELTRACE2_CTF_WRITER_SUPPORT),
 	FEATURE_STATUS("libbpf-strings", HAVE_LIBBPF_STRINGS_SUPPORT),
 	FEATURE_STATUS("libcapstone", HAVE_LIBCAPSTONE_SUPPORT),
+	FEATURE_STATUS("libasm", HAVE_LIBASM_SUPPORT),
 	FEATURE_STATUS("libdw-dwarf-unwind", HAVE_LIBDW_SUPPORT),
 	FEATURE_STATUS("libelf", HAVE_LIBELF_SUPPORT),
 	FEATURE_STATUS("libLLVM", HAVE_LIBLLVM_SUPPORT),
-- 
2.54.0.1064.gd145956f57-goog