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>
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@ -755,6 +755,14 @@ else
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endif
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endif
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ifdef NO_BACKTRACE
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BASIC_CFLAGS += -DNO_BACKTRACE
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else
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ifneq ($(call try-cc,$(SOURCE_BACKTRACE),),y)
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BASIC_CFLAGS += -DNO_BACKTRACE
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endif
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endif
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ifdef ASCIIDOC8
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export ASCIIDOC8
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endif
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@ -179,3 +179,17 @@ int main(void)
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}
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endef
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endif
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ifndef NO_BACKTRACE
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define SOURCE_BACKTRACE
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#include <execinfo.h>
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#include <stdio.h>
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int main(void)
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{
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backtrace(NULL, 0);
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backtrace_symbols(NULL, 0);
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return 0;
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}
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endef
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endif
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@ -1,7 +1,9 @@
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#include "../perf.h"
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#include "util.h"
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#include <sys/mman.h>
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#ifndef NO_BACKTRACE
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#include <execinfo.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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@ -163,6 +165,7 @@ size_t hex_width(u64 v)
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}
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/* Obtain a backtrace and print it to stdout. */
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#ifndef NO_BACKTRACE
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void dump_stack(void)
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{
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void *array[16];
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@ -177,3 +180,6 @@ void dump_stack(void)
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free(strings);
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}
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#else
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void dump_stack(void) {}
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#endif
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