perf symbol: Add command line support for addr2line path

Allow addr2line to be set either on the command line or via the
perfconfig file. This doesn't currently work with llvm-addr2line as
the addr2line code emits two things:
1) the address to decode,
2) a bogus ',' value.
The expectation is the bogus value will generate:
??
??:0
that terminates the addr2line reading. However, the output from
llvm-addr2line is a single line with just the input ',' locking up the
addr2line reading that is expecting a second line.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: German Gomez <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sandipan Das <[email protected]>
Cc: Tom Rix <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 317c987d3001..f47b5dde66bc 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -3217,6 +3217,12 @@ static int annotation__config(const char *var, const char *value, void *data)
 			pr_err("Not enough memory for annotate.objdump\n");
 			return -1;
 		}
+	} else if (!strcmp(var, "annotate.addr2line")) {
+		symbol_conf.addr2line_path = strdup(value);
+		if (!symbol_conf.addr2line_path) {
+			pr_err("Not enough memory for annotate.addr2line\n");
+			return -1;
+		}
 	} else if (!strcmp(var, "annotate.demangle")) {
 		symbol_conf.demangle = perf_config_bool("demangle", value);
 	} else if (!strcmp(var, "annotate.demangle_kernel")) {