[libsanitizer] Introduce flag descriptions.
Extend ParseFlag to accept the |description| parameter, add dummy values for all existing flags.
As the flags are parsed their descriptions are stored in a global linked list.
The tool can later call __sanitizer::PrintFlagDescriptions() to dump all the flag names and their descriptions.
Add the 'help' flag and make ASan, TSan and MSan print the flags if 'help' is set to 1.
llvm-svn: 204339
diff --git a/compiler-rt/lib/tsan/dd/dd_rtl.cc b/compiler-rt/lib/tsan/dd/dd_rtl.cc
index 4746843..7f3c75e 100644
--- a/compiler-rt/lib/tsan/dd/dd_rtl.cc
+++ b/compiler-rt/lib/tsan/dd/dd_rtl.cc
@@ -76,7 +76,7 @@
f->allow_addr2line = true;
// Override from command line.
- ParseFlag(env, &f->second_deadlock_stack, "second_deadlock_stack");
+ ParseFlag(env, &f->second_deadlock_stack, "second_deadlock_stack", "");
ParseCommonFlagsFromString(f, env);
// Copy back to common flags.