linux-kernel - [PATCH] perf tools: Check libaudit for perf-trace builtin

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Date:	Thu, 27 Sep 2012 20:23:38 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	David Ahern <dsahern@...il.com>
Subject: [PATCH] perf tools: Check libaudit for perf-trace builtin

From: Namhyung Kim <namhyung.kim@....com>

The newly added trace command requires an external audit library.
However it can cause a build error because it's not checked whether
the libaudit is installed on system:

    CC builtin-trace.o
  builtin-trace.c:7:22: fatal error: libaudit.h: No such file or directory
  compilation terminated.
  make: *** [builtin-trace.o] Error 1

Cc: David Ahern <dsahern@...il.com>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 tools/perf/Makefile                 | 16 ++++++++++++++--
 tools/perf/config/feature-tests.mak | 11 +++++++++++
 tools/perf/perf.c                   |  2 ++
 3 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 6958ba4f5dcb..5973f383eb8e 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -102,7 +102,7 @@ ifdef PARSER_DEBUG
 endif
 
 CFLAGS = -fno-omit-frame-pointer -ggdb3 -funwind-tables -Wall -Wextra -std=gnu99 $(CFLAGS_WERROR) $(CFLAGS_OPTIMIZE) $(EXTRA_WARNINGS) $(EXTRA_CFLAGS) $(PARSER_DEBUG_CFLAGS)
-EXTLIBS = -lpthread -lrt -lelf -lm -laudit
+EXTLIBS = -lpthread -lrt -lelf -lm
 ALL_CFLAGS = $(CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
 ALL_LDFLAGS = $(LDFLAGS)
 STRIP ?= strip
@@ -442,7 +442,6 @@ BUILTIN_OBJS += $(OUTPUT)builtin-kmem.o
 BUILTIN_OBJS += $(OUTPUT)builtin-lock.o
 BUILTIN_OBJS += $(OUTPUT)builtin-kvm.o
 BUILTIN_OBJS += $(OUTPUT)builtin-test.o
-BUILTIN_OBJS += $(OUTPUT)builtin-trace.o
 BUILTIN_OBJS += $(OUTPUT)builtin-inject.o
 
 PERFLIBS = $(LIB_FILE) $(LIBTRACEEVENT)
@@ -560,6 +559,19 @@ else
 	LIB_OBJS += $(OUTPUT)util/unwind.o
 endif
 
+ifdef NO_LIBAUDIT
+	BASIC_CFLAGS += -DNO_LIBAUDIT_SUPPORT
+else
+	FLAGS_LIBAUDIT = $(ALL_CFLAGS) $(ALL_LDFLAGS) -laudit
+	ifneq ($(call try-cc,$(SOURCE_LIBAUDIT),$(FLAGS_LIBAUDIT)),y)
+		msg := $(warning No libaudit.h found, please install audit-libs-devel or libaudit-dev);
+		BASIC_CFLAGS += -DNO_LIBAUDIT_SUPPORT
+	else
+		BUILTIN_OBJS += $(OUTPUT)builtin-trace.o
+		EXTLIBS += -laudit
+	endif
+endif
+
 ifdef NO_NEWT
 	BASIC_CFLAGS += -DNO_NEWT_SUPPORT
 else
diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index 116690a669d2..4add41bb0c7e 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -193,3 +193,14 @@ int main(void)
 }
 endef
 endif
+
+ifndef NO_LIBAUDIT
+define SOURCE_LIBAUDIT
+#include <libaudit.h>
+
+int main(void)
+{
+	return audit_open();
+}
+endef
+endif
\ No newline at end of file
diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 3fb052c9a27f..fc2f770e3027 100644
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -55,7 +55,9 @@ static struct cmd_struct commands[] = {
 	{ "lock",	cmd_lock,	0 },
 	{ "kvm",	cmd_kvm,	0 },
 	{ "test",	cmd_test,	0 },
+#ifndef NO_LIBAUDIT_SUPPORT
 	{ "trace",	cmd_trace,	0 },
+#endif
 	{ "inject",	cmd_inject,	0 },
 };
 
-- 
1.7.11.4

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