linux-kernel - [PATCH 08/52] perf build: Add feature check for dwarf

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Date:   Thu,  9 Nov 2023 15:59:27 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Stephane Eranian <eranian@...gle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-trace-devel@...r.kernel.org, linux-toolchains@...r.kernel.org
Subject: [PATCH 08/52] perf build: Add feature check for dwarf_getcfi()

The dwarf_getcfi() is available on libdw 0.142+.  Instead of just
checking the version number, it'd be nice to have a config item to check
the feature at build time.

Suggested-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/build/Makefile.feature            | 1 +
 tools/build/feature/Makefile            | 4 ++++
 tools/build/feature/test-dwarf_getcfi.c | 9 +++++++++
 3 files changed, 14 insertions(+)
 create mode 100644 tools/build/feature/test-dwarf_getcfi.c

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 934e2777a2db..64df118376df 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -32,6 +32,7 @@ FEATURE_TESTS_BASIC :=                  \
         backtrace                       \
         dwarf                           \
         dwarf_getlocations              \
+        dwarf_getcfi                    \
         eventfd                         \
         fortify-source                  \
         get_current_dir_name            \
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index dad79ede4e0a..37722e509eb9 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -7,6 +7,7 @@ FILES=                                          \
          test-bionic.bin                        \
          test-dwarf.bin                         \
          test-dwarf_getlocations.bin            \
+         test-dwarf_getcfi.bin                  \
          test-eventfd.bin                       \
          test-fortify-source.bin                \
          test-get_current_dir_name.bin          \
@@ -154,6 +155,9 @@ endif
 $(OUTPUT)test-dwarf_getlocations.bin:
 	$(BUILD) $(DWARFLIBS)
 
+$(OUTPUT)test-dwarf_getcfi.bin:
+	$(BUILD) $(DWARFLIBS)
+
 $(OUTPUT)test-libelf-getphdrnum.bin:
 	$(BUILD) -lelf
 
diff --git a/tools/build/feature/test-dwarf_getcfi.c b/tools/build/feature/test-dwarf_getcfi.c
new file mode 100644
index 000000000000..50e7d7cb7bdf
--- /dev/null
+++ b/tools/build/feature/test-dwarf_getcfi.c
@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <elfutils/libdw.h>
+
+int main(void)
+{
+	Dwarf *dwarf = NULL;
+	return dwarf_getcfi(dwarf) == NULL;
+}
-- 
2.42.0.869.gea05f2083d-goog