From: Irina Tirdea <irina.tir...@intel.com>
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.tir...@intel.com>
---
tools/perf/Makefile | 8 ++++++++
tools/perf/config/feature-tests.mak | 14 ++++++++++++++
tools/perf/util/util.c | 6 ++++++
3 files changed, 28 insertions(+)
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 25d2bab..c0d2ce3 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -756,6 +756,14 @@ else
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 @@ int main(void)
}
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 @@ size_t hex_width(u64 v)
}
/* Obtain a backtrace and print it to stdout. */
+#ifndef NO_BACKTRACE
void dump_stack(void)
{
void *array[16];
@@ -177,3 +180,6 @@ void dump_stack(void)
free(strings);
}
+#else
+void dump_stack(void) {}
+#endif
--
1.7.9.5
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