[Sanitizer] Always initialize a Symbolizer (even if 'symbolize' is false).

If 'symbolize' flag is not set, we still want to transform virtual address
to module+offset pair in the call to Symbolizer::SymbolizeCode().
See https://code.google.com/p/address-sanitizer/issues/detail?id=251 for
more details.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@197491 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/sanitizer_common/sanitizer_flags.h b/lib/sanitizer_common/sanitizer_flags.h
index ffc69fe18..34584f443 100644
--- a/lib/sanitizer_common/sanitizer_flags.h
+++ b/lib/sanitizer_common/sanitizer_flags.h
@@ -23,10 +23,12 @@ void ParseFlag(const char *env, int *flag, const char *name);
 void ParseFlag(const char *env, const char **flag, const char *name);
 
 struct CommonFlags {
-  // If set, use the online symbolizer from common sanitizer runtime.
+  // If set, use the online symbolizer from common sanitizer runtime to turn
+  // virtual addresses to file/line locations.
   bool symbolize;
   // Path to external symbolizer. If it is NULL, symbolizer will be looked for
-  // in PATH. If it is empty, external symbolizer will not be started.
+  // in PATH. If it is empty (or if "symbolize" is false), external symbolizer
+  // will not be started.
   const char *external_symbolizer_path;
   // Strips this prefix from file paths in error reports.
   const char *strip_path_prefix;