folly: make `FOLLY_USE_SYMBOLIZER` gates check for `1`

Summary: This diff change the `FOLLY_USE_SYMBOLIZER` gates to check for a value of `1`.

Reviewed By: yfeldblum

Differential Revision: D7471272

fbshipit-source-id: 74dbb4d56e1adc56ec75af5b4950ca2c027851cc

folly/Singleton.cpp

@@ -31,7 +31,7 @@
 #include <folly/Format.h>
 #include <folly/ScopeGuard.h>
 
-#ifdef FOLLY_USE_SYMBOLIZER
+#if FOLLY_USE_SYMBOLIZER
 #include <folly/experimental/symbolizer/Symbolizer.h> // @manual
 #endif
 
@@ -386,7 +386,7 @@ void SingletonVault::scheduleDestroyInstances() {
 // Singltone's to use it to print stack traces. It's important that we keep
 // this in the same compilation unit as the `SingletonVault` so that it's
 // setup/used iff singleton's are used.
-#ifdef FOLLY_USE_SYMBOLIZER
+#if FOLLY_USE_SYMBOLIZER
 namespace {
 
 std::string stackTraceGetter() {

folly/init/Init.cpp

@@ -21,7 +21,7 @@
 #include <folly/Singleton.h>
 #include <folly/portability/Config.h>
 
-#ifdef FOLLY_USE_SYMBOLIZER
+#if FOLLY_USE_SYMBOLIZER
 #include <folly/experimental/symbolizer/SignalHandler.h> // @manual
 #endif
 #include <folly/portability/GFlags.h>
@@ -29,7 +29,7 @@
 namespace folly {
 
 void init(int* argc, char*** argv, bool removeFlags) {
-#ifdef FOLLY_USE_SYMBOLIZER
+#if FOLLY_USE_SYMBOLIZER
   // Install the handler now, to trap errors received during startup.
   // The callbacks, if any, can be installed later
   folly::symbolizer::installFatalSignalHandler();
@@ -46,7 +46,7 @@ void init(int* argc, char*** argv, bool removeFlags) {
   auto programName = argc && argv && *argc > 0 ? (*argv)[0] : "unknown";
   google::InitGoogleLogging(programName);
 
-#ifdef FOLLY_USE_SYMBOLIZER
+#if FOLLY_USE_SYMBOLIZER
   // Don't use glog's DumpStackTraceAndExit; rely on our signal handler.
   google::InstallFailureFunction(abort);