perf tools: add NO_BACKTRACE for application self-debugging
perf has support for self-debugging by defining dump_stack function.
This function uses backtrace and backtrace_symbols functions defined as
GNU extensions.
In Android, bionic does not offer support for these functions and
compilation will fail with the following error:
target C: libperf <= tools/perf/util/util.c
tools/perf/util/util.c:4:22: fatal error: execinfo.h: No such file or directory
compilation terminated.
Add a compile-time option (NO_BACKTRACE) to enable or disable
self-debugging functionality in perf. This can also help in debugging
since it offers the possibility to turn on/off printing the backtrace.
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1347065004-15306-12-git-send-email-irina.tirdea@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index afd5075..3eda492 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -755,6 +755,14 @@
endif
endif
+ifdef NO_BACKTRACE
+ BASIC_CFLAGS += -DNO_BACKTRACE
+else
+ ifneq ($(call try-cc,$(SOURCE_BACKTRACE),),y)
+ BASIC_CFLAGS += -DNO_BACKTRACE
+ endif
+endif
+
ifdef ASCIIDOC8
export ASCIIDOC8
endif
diff --git a/tools/perf/config/feature-tests.mak b/tools/perf/config/feature-tests.mak
index 2f1156a..116690a 100644
--- a/tools/perf/config/feature-tests.mak
+++ b/tools/perf/config/feature-tests.mak
@@ -179,3 +179,17 @@
}
endef
endif
+
+ifndef NO_BACKTRACE
+define SOURCE_BACKTRACE
+#include <execinfo.h>
+#include <stdio.h>
+
+int main(void)
+{
+ backtrace(NULL, 0);
+ backtrace_symbols(NULL, 0);
+ return 0;
+}
+endef
+endif
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 1b8775c..2055cf3 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -1,7 +1,9 @@
#include "../perf.h"
#include "util.h"
#include <sys/mman.h>
+#ifndef NO_BACKTRACE
#include <execinfo.h>
+#endif
#include <stdio.h>
#include <stdlib.h>
@@ -163,6 +165,7 @@
}
/* Obtain a backtrace and print it to stdout. */
+#ifndef NO_BACKTRACE
void dump_stack(void)
{
void *array[16];
@@ -177,3 +180,6 @@
free(strings);
}
+#else
+void dump_stack(void) {}
+#endif